APP微信支付Java后台的实现（springmvc）

第一次做微信支付，阅读完开发文档后，下了个官方demo，摸索了好久，期间也出现了好多问题，终于是实现生成预支付订单以及支付成功后接收微信服务器通知，不多说了，直接上代码：

一、工具类

ConstantUtil.java

public class ConstantUtil {
    /**
     * 微信开发平台应用ID
     */
    public static final String APP_ID="wx0a3242424aae13c6";
    /**
     * 应用对应的凭证
     */
    public static final String APP_SECRET="1d29d733ewrewrfwed1b58968cce";
    /**
     * 应用对应的密钥
     */
    public static final String APP_KEY="dfsfdvdfvgk32423423oGdfsfdsvBO66";
    /**
     * 微信支付商户号
     */
    public static final String MCH_ID="1469dfsf02";
    /**
     * 商品描述
     */
    public static final String BODY="QQ游戏-账户充值";
    /**
     * 商户号对应的密钥
     */
    public static final String PARTNER_key="123466";

    /**
     * 商户id
     */
    public static final String PARTNER_ID="14698sdfs402dsfdew402";
    /**
     * 常量固定值
     */
    public static final String GRANT_TYPE="client_credential";
    /**
     * 获取预支付id的接口url
     */
    public static String GATEURL = "https://api.mch.weixin.qq.com/pay/unifiedorder";
    /**
     * 微信服务器回调通知url
     */
    public static String NOTIFY_URL="http://www.bairuoheng.cn/app/tenpay/notify";
}

Md5Util.java

public class MD5Util {

    /**
     * MD5加密
     * @param b
     * @return
     */
    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(charsetname)));
        } catch (Exception exception) {
        }
        return resultString;
    }

    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

}

XMLUtil.java

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import java.io.IOException; import java.io.InputStream; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import org.jdom2.Document; import org.jdom2.Element; import org.jdom2.JDOMException; import org.jdom2.input.SAXBuilder; import java.io.ByteArrayInputStream; public class XMLUtil {     /**      * 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。      * @param strxml      * @return      * @throws JDOMException      * @throws IOException      */     public static Map doXMLParse(String strxml) throws JDOMException, IOException {         strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");         if(null == strxml || "".equals(strxml)) {             return null;         }                   Map m = new HashMap();                   InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));         SAXBuilder builder = new SAXBuilder();         Document doc = builder.build(in);         Element root = doc.getRootElement();         List list = root.getChildren();         Iterator it = list.iterator();         while(it.hasNext()) {             Element e = (Element) it.next();             String k = e.getName();             String v = "";             List children = e.getChildren();             if(children.isEmpty()) {                 v = e.getTextNormalize();             } else {                 v = XMLUtil.getChildrenText(children);             }                           m.put(k, v);         }                   //关闭流         in.close();                   return m;     }           /**      * 获取子结点的xml      * @param children      * @return String      */     public static String getChildrenText(List children) {         StringBuffer sb = new StringBuffer();         if(!children.isEmpty()) {             Iterator it = children.iterator();             while(it.hasNext()) {                 Element e = (Element) it.next();                 String name = e.getName();                 String value = e.getTextNormalize();                 List list = e.getChildren();                 sb.append("<" + name + ">");                 if(!list.isEmpty()) {                     sb.append(XMLUtil.getChildrenText(list));                 }                 sb.append(value);                 sb.append("</" + name + ">");             }         }                   return sb.toString();     }           /**      * 获取xml编码字符集      * @param strxml      * @return      * @throws IOException      * @throws JDOMException      */     public static String getXMLEncoding(String strxml) throws JDOMException, IOException {         InputStream in = HttpClientUtil.String2Inputstream(strxml);         SAXBuilder builder = new SAXBuilder();         Document doc = builder.build(in);         in.close();         return (String)doc.getProperty("encoding");     }           /**      * 支付成功，返回微信那服务器      * @param return_code      * @param return_msg      * @return      */     public static String setXML(String return_code, String return_msg) {         return "<xml><return_code><![CDATA[" + return_code + "]]></return_code><return_msg><![CDATA[" + return_msg + "]]></return_msg></xml>";     }           public static String createXML(Map<String,Object> map){         Set<Entry<String,Object>> set=map.entrySet();         set.iterator();         return null;     }       }

HttpClientUtil.java

public class HttpClientUtil {
    /**
     * http客户端工具类
     *
     */
    public static final String SunX509 = "SunX509";
    public static final String JKS = "JKS";
    public static final String PKCS12 = "PKCS12";
    public static final String TLS = "TLS";

    /**
     * get HttpURLConnection
     * @param strUrl url地址
     * @return HttpURLConnection
     * @throws IOException
     */
    public static HttpURLConnection getHttpURLConnection(String strUrl)
            throws IOException {
        URL url = new URL(strUrl);
        HttpURLConnection httpURLConnection = (HttpURLConnection) url
                .openConnection();
        return httpURLConnection;
    }

    /**
     * get HttpsURLConnection
     * @param strUrl url地址ַ
     * @return HttpsURLConnection
     * @throws IOException
     */
    public static HttpsURLConnection getHttpsURLConnection(String strUrl)
            throws IOException {
        URL url = new URL(strUrl);
        HttpsURLConnection httpsURLConnection = (HttpsURLConnection) url
                .openConnection();
        return httpsURLConnection;
    }

    /**
     * 获取不带查询串的url
     * @param strUrl
     * @return String
     */
    public static String getURL(String strUrl) {

        if(null != strUrl) {
            int indexOf = strUrl.indexOf("?");
            if(-1 != indexOf) {
                return strUrl.substring(0, indexOf);
            } 

            return strUrl;
        }

        return strUrl;

    }

    /**
     * 获取查询串
     * @param strUrl
     * @return String
     */
    public static String getQueryString(String strUrl) {

        if(null != strUrl) {
            int indexOf = strUrl.indexOf("?");
            if(-1 != indexOf) {
                return strUrl.substring(indexOf+1, strUrl.length());
            } 

            return "";
        }

        return strUrl;
    }

    /**
     * 查询字符串转化为map
     * name1=key1&name2=key2&...
     * @param queryString
     * @return
     */
    public static Map queryString2Map(String queryString) {
        if(null == queryString || "".equals(queryString)) {
            return null;
        }

        Map m = new HashMap();
        String[] strArray = queryString.split("&");
        for(int index = 0; index < strArray.length; index++) {
            String pair = strArray[index];
            HttpClientUtil.putMapByPair(pair, m);
        }

        return m;

    }

    /**
     * 把键值添加到map
     * pair:name=value
     * @param pair name=value
     * @param m
     */
    public static void putMapByPair(String pair, Map m) {

        if(null == pair || "".equals(pair)) {
            return;
        }

        int indexOf = pair.indexOf("=");
        if(-1 != indexOf) {
            String k = pair.substring(0, indexOf);
            String v = pair.substring(indexOf+1, pair.length());
            if(null != k && !"".equals(k)) {
                m.put(k, v);
            }
        } else {
            m.put(pair, "");
        }
    }
    /**
     * BufferedReader转换成String<br/>
     * 注意:流关闭需要自行处理
     * @param reader
     * @return
     * @throws IOException
     */
    public static String bufferedReader2String(BufferedReader reader) throws IOException {
        StringBuffer buf = new StringBuffer();
        String line = null;
        while( (line = reader.readLine()) != null) {
            buf.append(line);
            buf.append("\r\n");
        }

        return buf.toString();
    }
    /**
     * 处理输出<br/>
     * 注意:流关闭需要自行处理
     * @param out
     * @param data
     * @param len
     * @throws IOException
     */
    public static void doOutput(OutputStream out, byte[] data, int len)
            throws IOException {
        int dataLen = data.length;
        int off = 0;
        while (off < data.length) {
            if (len >= dataLen) {
                out.write(data, off, dataLen);
                off += dataLen;
            } else {
                out.write(data, off, len);
                off += len;
                dataLen -= len;
            }

            // ˢ�»�����
            out.flush();
        }

    }
    /**
     * 获取SSLContext
     * @param trustFile
     * @param trustPasswd
     * @param keyFile
     * @param keyPasswd
     * @return
     * @throws NoSuchAlgorithmException
     * @throws KeyStoreException
     * @throws IOException
     * @throws CertificateException
     * @throws UnrecoverableKeyException
     * @throws KeyManagementException
     */
    public static SSLContext getSSLContext(
            FileInputStream trustFileInputStream, String trustPasswd,
            FileInputStream keyFileInputStream, String keyPasswd)
            throws NoSuchAlgorithmException, KeyStoreException,
            CertificateException, IOException, UnrecoverableKeyException,
            KeyManagementException {

        // ca
        TrustManagerFactory tmf = TrustManagerFactory.getInstance(HttpClientUtil.SunX509);
        KeyStore trustKeyStore = KeyStore.getInstance(HttpClientUtil.JKS);
        trustKeyStore.load(trustFileInputStream, HttpClientUtil
                .str2CharArray(trustPasswd));
        tmf.init(trustKeyStore);

        final char[] kp = HttpClientUtil.str2CharArray(keyPasswd);
        KeyManagerFactory kmf = KeyManagerFactory.getInstance(HttpClientUtil.SunX509);
        KeyStore ks = KeyStore.getInstance(HttpClientUtil.PKCS12);
        ks.load(keyFileInputStream, kp);
        kmf.init(ks, kp);

        SecureRandom rand = new SecureRandom();
        SSLContext ctx = SSLContext.getInstance(HttpClientUtil.TLS);
        ctx.init(kmf.getKeyManagers(), tmf.getTrustManagers(), rand);

        return ctx;
    }

    /**
     * 字符串转换成char数组
     * @param str
     * @return char[]
     */
    public static char[] str2CharArray(String str) {
        if(null == str) return null;

        return str.toCharArray();
    }

    public static InputStream String2Inputstream(String str) {
        return new ByteArrayInputStream(str.getBytes());
    }

    /**
     * InputStream转换成Byte
     * 注意:流关闭需要自行处理
     * @param in
     * @return byte
     * @throws Exception
     */
    public static byte[] InputStreamTOByte(InputStream in) throws IOException{  

        int BUFFER_SIZE = 4096;
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] data = new byte[BUFFER_SIZE];
        int count = -1;  

        while((count = in.read(data,0,BUFFER_SIZE)) != -1)
            outStream.write(data, 0, count);  

        data = null;
        byte[] outByte = outStream.toByteArray();
        outStream.close();

        return outByte;
    } 

    /**
     * InputStream转换成String
     * 注意:流关闭需要自行处理
     * @param in
     * @param encoding 编码
     * @return String
     * @throws Exception
     */
    public static String InputStreamTOString(InputStream in,String encoding) throws IOException{  

        return new String(InputStreamTOByte(in),encoding);

    }  

}

TenpayUtil.java

public class TenpayUtil {

    /**
     * 把对象转换成字符串
     * @param obj
     * @return String 转换成字符串,若对象为null,则返回空字符串.
     */
    public static String toString(Object obj) {
        if(obj == null)
            return "";

        return obj.toString();
    }

    /**
     * 把对象转换为int数值.
     *
     * @param obj
     *            包含数字的对象.
     * @return int 转换后的数值,对不能转换的对象返回0。
     */
    public static int toInt(Object obj) {
        int a = 0;
        try {
            if (obj != null)
                a = Integer.parseInt(obj.toString());
        } catch (Exception e) {

        }
        return a;
    }

    /**
     * 获取当前时间 yyyyMMddHHmmss
     * @return String
     */
    public static String getCurrTime() {
        Date now = new Date();
        SimpleDateFormat outFormat = new SimpleDateFormat("yyyyMMddHHmmss");
        String s = outFormat.format(now);
        return s;
    }

    /**
     * 获取当前日期 yyyyMMdd
     * @param date
     * @return String
     */
    public static String formatDate(Date date) {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");
        String strDate = formatter.format(date);
        return strDate;
    }

    /**
     * 取出一个指定长度大小的随机正整数.
     *
     * @param length
     *            int 设定所取出随机数的长度。length小于11
     * @return int 返回生成的随机数。
     */
    public static int buildRandom(int length) {
        int num = 1;
        double random = Math.random();
        if (random < 0.1) {
            random = random + 0.1;
        }
        for (int i = 0; i < length; i++) {
            num = num * 10;
        }
        return (int) ((random * num));
    }

    /**
     * 获取编码字符集
     * @param request
     * @param response
     * @return String
     */
    public static String getCharacterEncoding(HttpServletRequest request,
            HttpServletResponse response) {

        if(null == request || null == response) {
            return "gbk";
        }

        String enc = request.getCharacterEncoding();
        if(null == enc || "".equals(enc)) {
            enc = response.getCharacterEncoding();
        }

        if(null == enc || "".equals(enc)) {
            enc = "gbk";
        }

        return enc;
    }

    /**
     * 获取unix时间，从1970-01-01 00:00:00开始的秒数
     * @param date
     * @return long
     */
    public static long getUnixTime(Date date) {
        if( null == date ) {
            return 0;
        }

        return date.getTime()/1000;
    }

    /**
     * 时间转换成字符串
     * @param date 时间
     * @param formatType 格式化类型
     * @return String
     */
    public static String date2String(Date date, String formatType) {
        SimpleDateFormat sdf = new SimpleDateFormat(formatType);
        return sdf.format(date);
    }
}

WXUtil.java

public class WXUtil {
    /**
     * 生成随机字符串
     * @return
     */
    public static String getNonceStr() {
        Random random = new Random();
        return MD5Util.MD5Encode(String.valueOf(random.nextInt(10000)), "utf8");
    }
    /**
     * 获取时间戳
     * @return
     */
    public static String getTimeStamp() {
        return String.valueOf(System.currentTimeMillis() / 1000);
    }
}

UUID.java

public class UUID {
    private static Date date = new Date();
    private static StringBuilder buf = new StringBuilder();
    private static int seq = 0;
    private static final int ROTATION = 99999;

    public static synchronized long next() {
        if (seq > ROTATION)
            seq = 0;
        buf.delete(0, buf.length());
        date.setTime(System.currentTimeMillis());
        String str = String.format("%1$tY%1$tm%1$td%1$tk%1$tM%1$tS%2$05d", date, seq++);
        return Long.parseLong(str);
    }

    private UUID(){

    }
}

二、请求响应处理以及客户端处理类

ResponseHandler.java

/**
 * 应答处理类
 * 应答处理类继承此类，重写isTenpaySign方法即可。
 *
 */
public class ResponseHandler { 

    /** 密钥 */
    private String key;

    /** 应答的参数 */
    private SortedMap parameters; 

    private HttpServletRequest request;

    private HttpServletResponse response;

    private String uriEncoding;

    /**
     * 构造函数
     *
     * @param request
     * @param response
     */
    public ResponseHandler(HttpServletRequest request,
            HttpServletResponse response)  {
        this.request = request;
        this.response = response;

        this.key = "";
        this.parameters = new TreeMap();
        this.uriEncoding = "";

        Map m = this.request.getParameterMap();
        Iterator it = m.keySet().iterator();
        while (it.hasNext()) {
            String k = (String) it.next();
            String v = ((String[]) m.get(k))[0];
            this.setParameter(k, v);
        }

    }

    /**
    *获取密钥
    */
    public String getKey() {
        return key;
    }

    /**
    *设置密钥
    */
    public void setKey(String key) {
        this.key = key;
    }

    /**
     * 获取参数值
     * @param parameter 参数名称
     * @return String
     */
    public String getParameter(String parameter) {
        String s = (String)this.parameters.get(parameter);
        return (null == s) ? "" : s;
    }

    /**
     * 设置参数值
     * @param parameter 参数名称
     * @param parameterValue 参数值
     */
    public void setParameter(String parameter, String parameterValue) {
        String v = "";
        if(null != parameterValue) {
            v = parameterValue.trim();
        }
        this.parameters.put(parameter, v);
    }

    /**
     * 返回所有的参数
     * @return SortedMap
     */
    public SortedMap getAllParameters() {
        return this.parameters;
    }

    /**
     * 是否财付通签名,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
     * @return boolean
     */
    public boolean isTenpaySign() {
        StringBuffer sb = new StringBuffer();
        Set es = this.parameters.entrySet();
        Iterator it = es.iterator();
        while(it.hasNext()) {
            Map.Entry entry = (Map.Entry)it.next();
            String k = (String)entry.getKey();
            String v = (String)entry.getValue();
            if(!"sign".equals(k) && null != v && !"".equals(v)) {
                sb.append(k + "=" + v + "&");
            }
        }

        sb.append("key=" + this.getKey());

        //算出摘要
        String enc = TenpayUtil.getCharacterEncoding(this.request, this.response);
        String sign = MD5Util.MD5Encode(sb.toString(), enc).toLowerCase();

        String tenpaySign = this.getParameter("sign").toLowerCase();

        return tenpaySign.equals(sign);
    }

    /**
     * 返回处理结果给财付通服务器。
     * @param msg: Success or fail。
     * @throws IOException
     */
    public void sendToCFT(String msg) throws IOException {
        String strHtml = msg;
        PrintWriter out = this.getHttpServletResponse().getWriter();
        out.println(strHtml);
        out.flush();
        out.close();

    }

    /**
     * 获取uri编码
     * @return String
     */
    public String getUriEncoding() {
        return uriEncoding;
    }

    /**
     * 设置uri编码
     * @param uriEncoding
     * @throws UnsupportedEncodingException
     */
    public void setUriEncoding(String uriEncoding)
            throws UnsupportedEncodingException {
        if (!"".equals(uriEncoding.trim())) {
            this.uriEncoding = uriEncoding;

            // 编码转换
            String enc = TenpayUtil.getCharacterEncoding(request, response);
            Iterator it = this.parameters.keySet().iterator();
            while (it.hasNext()) {
                String k = (String) it.next();
                String v = this.getParameter(k);
                v = new String(v.getBytes(uriEncoding.trim()), enc);
                this.setParameter(k, v);
            }
        }
    }

    protected HttpServletRequest getHttpServletRequest() {
        return this.request;
    }

    protected HttpServletResponse getHttpServletResponse() {
        return this.response;
    }

}

RequestHandler.java

/**
 * 请求处理类
 * 请求处理类继承此类，重写createSign方法即可。
 *
 */
public class RequestHandler {

    /** 网关url地址 */
    private String gateUrl;

    /** 密钥 */
    private String key;

    /** 请求的参数 */
    private SortedMap parameters;

    protected HttpServletRequest request;

    protected HttpServletResponse response;

    /**
     * 构造函数
     * @param request
     * @param response
     */
    public RequestHandler(HttpServletRequest request, HttpServletResponse response) {
        this.request = request;
        this.response = response;

        this.gateUrl = "https://gw.tenpay.com/gateway/pay.htm";
        this.key = "";
        this.parameters = new TreeMap();
    }

    /**
    *初始化函数。
    */
    public void init() {
        //nothing to do
    }

    /**
    *获取入口地址,不包含参数值
    */
    public String getGateUrl() {
        return gateUrl;
    }

    /**
    *设置入口地址,不包含参数值
    */
    public void setGateUrl(String gateUrl) {
        this.gateUrl = gateUrl;
    }

    /**
    *获取密钥
    */
    public String getKey() {
        return key;
    }

    /**
    *设置密钥
    */
    public void setKey(String key) {
        this.key = key;
    }

    /**
     * 获取参数值
     * @param parameter 参数名称
     * @return String
     */
    public String getParameter(String parameter) {
        String s = (String)this.parameters.get(parameter);
        return (null == s) ? "" : s;
    }

    /**
     * 设置参数值
     * @param parameter 参数名称
     * @param parameterValue 参数值
     */
    public void setParameter(String parameter, Object parameterValue) {
        String v = "";
        if(null != parameterValue) {
            if(parameterValue instanceof String)
            v = ((String) parameterValue).trim();
        }
        this.parameters.put(parameter, v);
    }

    /**
     * 返回所有的参数
     * @return SortedMap
     */
    public SortedMap getAllParameters() {
        return this.parameters;
    }

    /**
     * 获取带参数的请求URL
     * @return String
     * @throws UnsupportedEncodingException
     */
    public String getRequestURL() throws UnsupportedEncodingException {

        this.createSign();

        StringBuffer sb = new StringBuffer();
        String enc = TenpayUtil.getCharacterEncoding(this.request, this.response);
        Set es = this.parameters.entrySet();
        Iterator it = es.iterator();
        while(it.hasNext()) {
            Map.Entry entry = (Map.Entry)it.next();
            String k = (String)entry.getKey();
            String v = (String)entry.getValue();

            if(!"spbill_create_ip".equals(k)) {
                sb.append(k + "=" + URLEncoder.encode(v, enc) + "&");
            } else {
                sb.append(k + "=" + v.replace("\\.", "%2E") + "&");
            }
        }

        //去掉最后一个&
        String reqPars = sb.substring(0, sb.lastIndexOf("&"));

        return this.getGateUrl() + "?" + reqPars;

    }

    public void doSend() throws UnsupportedEncodingException, IOException {
        this.response.sendRedirect(this.getRequestURL());
    }

    /**
     * 创建md5摘要,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
     */
    protected void createSign() {
        StringBuffer sb = new StringBuffer();
        Set es = this.parameters.entrySet();
        Iterator it = es.iterator();
        while(it.hasNext()) {
            Map.Entry entry = (Map.Entry)it.next();
            String k = (String)entry.getKey();
            String v = (String)entry.getValue();
            if(null != v && !"".equals(v)
                    && !"sign".equals(k) && !"key".equals(k)) {
                sb.append(k + "=" + v + "&");
            }
        }
        sb.append("key=" + this.getKey());
        String enc = TenpayUtil.getCharacterEncoding(this.request, this.response);
        String sign = MD5Util.MD5Encode(sb.toString(), enc).toUpperCase();

        this.setParameter("sign", sign);

    }

    protected HttpServletRequest getHttpServletRequest() {
        return this.request;
    }

    protected HttpServletResponse getHttpServletResponse() {
        return this.response;
    }
}

ClientRequestHandler.java

public class ClientRequestHandler extends PrepayIdRequestHandler {

    public ClientRequestHandler(HttpServletRequest request,
            HttpServletResponse response) {
        super(request, response);
        // TODO Auto-generated constructor stub
    }

    public String getXmlBody() {
        StringBuffer sb = new StringBuffer();
        Set es = super.getAllParameters().entrySet();
        Iterator it = es.iterator();
        while (it.hasNext()) {
            Map.Entry entry = (Map.Entry) it.next();
            String k = (String) entry.getKey();
            String v = (String) entry.getValue();
            if (!"appkey".equals(k)) {
                sb.append("<" + k + ">" + v + "<" + k + ">" + "\r\n");
            }
        }
        return sb.toString();
    }
}

PaypreIdRequestHandler.java

public class PrepayIdRequestHandler extends RequestHandler {

    public PrepayIdRequestHandler(HttpServletRequest request,
            HttpServletResponse response) {
        super(request, response);
    }

    public String createMD5Sign() {
        StringBuffer sb = new StringBuffer();
        Set es = super.getAllParameters().entrySet();
        Iterator it = es.iterator();
        while (it.hasNext()) {
            Map.Entry entry = (Map.Entry) it.next();
            String k = (String) entry.getKey();
            String v = (String) entry.getValue();
            sb.append(k + "=" + v + "&");
        }
        String params=sb.append("key="+ConstantUtil.APP_KEY).substring(0);
        String sign = MD5Util.MD5Encode(params, "utf8");
        return sign.toUpperCase();
    }

    // 提交预支付
    public String sendPrepay() throws Exception {
        String prepayid = "";
        Set es=super.getAllParameters().entrySet();
        Iterator it=es.iterator();
        StringBuffer sb = new StringBuffer("<xml>");
        while(it.hasNext()){
            Map.Entry entry = (Map.Entry) it.next();
            String k = (String) entry.getKey();
            String v = (String) entry.getValue();
            sb.append("<"+k+">"+v+"</"+k+">");
        }
        sb.append("</xml>");
        String params=sb.substring(0);
        System.out.println("请求参数："+params);
        String requestUrl = super.getGateUrl();
        System.out.println("请求url："+requestUrl);
        TenpayHttpClient httpClient = new TenpayHttpClient();
        httpClient.setReqContent(requestUrl);
        String resContent = "";
        if (httpClient.callHttpPost(requestUrl, params)) {
            resContent = httpClient.getResContent();
            System.out.println("获取prepayid的返回值："+resContent);
            Map<String,String> map=XMLUtil.doXMLParse(resContent);
            if(map.containsKey("prepay_id"))
                prepayid=map.get("prepay_id");
        }
        return prepayid;
    }
}

TenpayHttpClient.java

public class TenpayHttpClient {

    /** 请求内容，无论post和get，都用get方式提供 */
    private String reqContent;

    /** 应答内容 */
    private String resContent;

    /** 请求方法 */
    private String method;

    /** 错误信息 */
    private String errInfo;

    /** 超时时间,以秒为单位 */
    private int timeOut;

    /** http应答编码 */
    private int responseCode;

    /** 字符编码 */
    private String charset;

    private InputStream inputStream;

    public TenpayHttpClient() {
        this.reqContent = "";
        this.resContent = "";
        this.method = "POST";
        this.errInfo = "";
        this.timeOut = 30;//30秒

        this.responseCode = 0;
        this.charset = "utf8";

        this.inputStream = null;
    }

    /**
     * 设置请求内容
     * @param reqContent 表求内容
     */
    public void setReqContent(String reqContent) {
        this.reqContent = reqContent;
    }

    /**
     * 获取结果内容
     * @return String
     * @throws IOException
     */
    public String getResContent() {
        try {
            this.doResponse();
        } catch (IOException e) {
            this.errInfo = e.getMessage();
            //return "";
        }

        return this.resContent;
    }

    /**
     * 设置请求方法post或者get
     * @param method 请求方法post/get
     */
    public void setMethod(String method) {
        this.method = method;
    }

    /**
     * 获取错误信息
     * @return String
     */
    public String getErrInfo() {
        return this.errInfo;
    }

    /**
     * 设置超时时间,以秒为单位
     * @param timeOut 超时时间,以秒为单位
     */
    public void setTimeOut(int timeOut) {
        this.timeOut = timeOut;
    }

    /**
     * 获取http状态码
     * @return int
     */
    public int getResponseCode() {
        return this.responseCode;
    }

    protected void callHttp() throws IOException {

        if("POST".equals(this.method.toUpperCase())) {
            String url = HttpClientUtil.getURL(this.reqContent);
            String queryString = HttpClientUtil.getQueryString(this.reqContent);
            byte[] postData = queryString.getBytes(this.charset);
            this.httpPostMethod(url, postData);

            return ;
        }

        this.httpGetMethod(this.reqContent);

    } 

    public boolean callHttpPost(String url, String postdata) {
        boolean flag = false;
        byte[] postData;
        try {
            postData = postdata.getBytes(this.charset);
            this.httpPostMethod(url, postData);
            flag = true;
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return flag;
    }

    /**
     * 以http post方式通信
     * @param url
     * @param postData
     * @throws IOException
     */
    protected void httpPostMethod(String url, byte[] postData)
            throws IOException {

        HttpURLConnection conn = HttpClientUtil.getHttpURLConnection(url);

        this.doPost(conn, postData);
    }

    /**
     * 以http get方式通信
     *
     * @param url
     * @throws IOException
     */
    protected void httpGetMethod(String url) throws IOException {

        HttpURLConnection httpConnection =
            HttpClientUtil.getHttpURLConnection(url);

        this.setHttpRequest(httpConnection);

        httpConnection.setRequestMethod("GET");

        this.responseCode = httpConnection.getResponseCode();

        this.inputStream = httpConnection.getInputStream();

    }

    /**
     * 以https get方式通信
     * @param url
     * @param sslContext
     * @throws IOException
     */
    protected void httpsGetMethod(String url, SSLContext sslContext)
            throws IOException {

        SSLSocketFactory sf = sslContext.getSocketFactory();

        HttpsURLConnection conn = HttpClientUtil.getHttpsURLConnection(url);

        conn.setSSLSocketFactory(sf);

        this.doGet(conn);

    }

    protected void httpsPostMethod(String url, byte[] postData,
            SSLContext sslContext) throws IOException {

        SSLSocketFactory sf = sslContext.getSocketFactory();

        HttpsURLConnection conn = HttpClientUtil.getHttpsURLConnection(url);

        conn.setSSLSocketFactory(sf);

        this.doPost(conn, postData);

    }

    /**
     * 设置http请求默认属性
     * @param httpConnection
     */
    protected void setHttpRequest(HttpURLConnection httpConnection) {

        //设置连接超时时间
        httpConnection.setConnectTimeout(this.timeOut * 1000);

        //不使用缓存
        httpConnection.setUseCaches(false);

        //允许输入输出
        httpConnection.setDoInput(true);
        httpConnection.setDoOutput(true);

    }

    /**
     * 处理应答
     * @throws IOException
     */
    protected void doResponse() throws IOException {

        if(null == this.inputStream) {
            return;
        }

        //获取应答内容
        this.resContent=HttpClientUtil.InputStreamTOString(this.inputStream,this.charset); 

        //关闭输入流
        this.inputStream.close();

    }

    /**
     * post方式处理
     * @param conn
     * @param postData
     * @throws IOException
     */
    protected void doPost(HttpURLConnection conn, byte[] postData)
            throws IOException {

        // 以post方式通信
        conn.setRequestMethod("POST");

        // 设置请求默认属性
        this.setHttpRequest(conn);

        // Content-Type
        conn.setRequestProperty("Content-Type",
                "application/x-www-form-urlencoded");

        BufferedOutputStream out = new BufferedOutputStream(conn
                .getOutputStream());

        final int len = 1024; // 1KB
        HttpClientUtil.doOutput(out, postData, len);

        // 关闭流
        out.close();

        // 获取响应返回状态码
        this.responseCode = conn.getResponseCode();

        // 获取应答输入流
        this.inputStream = conn.getInputStream();

    }

    /**
     * get方式处理
     * @param conn
     * @throws IOException
     */
    protected void doGet(HttpURLConnection conn) throws IOException {

        //以GET方式通信
        conn.setRequestMethod("GET");

        //设置请求默认属性
        this.setHttpRequest(conn);

        //获取响应返回状态码
        this.responseCode = conn.getResponseCode();

        //获取应答输入流
        this.inputStream = conn.getInputStream();
    }

}

ClientResponseHandler.java

public class ClientResponseHandler {

    /** 应答原始内容 */
    private String content;

    /** 应答的参数 */
    private SortedMap parameters; 

    /** 密钥 */
    private String key;

    /** 字符集 */
    private String charset;

    public ClientResponseHandler() {
        this.content = "";
        this.parameters = new TreeMap();
        this.key = "";
        this.charset = "utf8";
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) throws Exception {
        this.content = content;

        this.doParse();
    }

    /**
     * 获取参数值
     * @param parameter 参数名称
     * @return String
     */
    public String getParameter(String parameter) {
        String s = (String)this.parameters.get(parameter);
        return (null == s) ? "" : s;
    }

    /**
     * 设置参数值
     * @param parameter 参数名称
     * @param parameterValue 参数值
     */
    public void setParameter(String parameter, String parameterValue) {
        String v = "";
        if(null != parameterValue) {
            v = parameterValue.trim();
        }
        this.parameters.put(parameter, v);
    }

    /**
     * 返回所有的参数
     * @return SortedMap
     */
    public SortedMap getAllParameters() {
        return this.parameters;
    }    

    /**
    *获取密钥
    */
    public String getKey() {
        return key;
    }

    /**
    *设置密钥
    */
    public void setKey(String key) {
        this.key = key;
    }

    public String getCharset() {
        return this.charset;
    }

    public void setCharset(String charset) {
        this.charset = charset;
    }    

    /**
     * 是否财付通签名,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
     * @return boolean
     */
    public boolean isTenpaySign() {
        StringBuffer sb = new StringBuffer();
        Set es = this.parameters.entrySet();
        Iterator it = es.iterator();
        while(it.hasNext()) {
            Map.Entry entry = (Map.Entry)it.next();
            String k = (String)entry.getKey();
            String v = (String)entry.getValue();
            if(!"sign".equals(k) && null != v && !"".equals(v)) {
                sb.append(k + "=" + v + "&");
            }
        }

        sb.append("key=" + this.getKey());

        //算出摘要
        String sign = MD5Util.MD5Encode(sb.toString(), this.charset).toLowerCase();

        String tenpaySign = this.getParameter("sign").toLowerCase();

        return tenpaySign.equals(sign);
    }

    /**
     * 是否财付通签名
     * @param signParameterArray 签名的参数数组
     * @return boolean
     */
    protected boolean isTenpaySign(String signParameterArray[]) {

        StringBuffer signPars = new StringBuffer();
        for(int index = 0; index < signParameterArray.length; index++) {
            String k = signParameterArray[index];
            String v = this.getParameter(k);
            if(null != v && !"".equals(v)) {
                signPars.append(k + "=" + v + "&");
            }
        }

        signPars.append("key=" + this.getKey());

        //算出摘要
        String sign = MD5Util.MD5Encode(
                signPars.toString(), this.charset).toLowerCase();

        String tenpaySign = this.getParameter("sign").toLowerCase();

        return tenpaySign.equals(sign);
    }

    /**
     * 解析XML内容
     */
    protected void doParse() throws JDOMException, IOException {
        String xmlContent = this.getContent();

        //解析xml,得到map
        Map m = XMLUtil.doXMLParse(xmlContent);

        //设置参数
        Iterator it = m.keySet().iterator();
        while(it.hasNext()) {
            String k = (String) it.next();
            String v = (String) m.get(k);
            this.setParameter(k, v);
        }

    }

}

三、控制类的实现

TenpayController.java

@Controller
@Scope("prototype")
public class TenPayController {

    @Autowired
    private PayRecordService payRecordService;
    @Autowired
    private AppCustomerService appCustomerService;

    private String out_trade_no = "";

    /**
     * 生成预支付订单，获取prepayId
     * @param request
     * @param response
     * @return
     * @throws Exception
     */
    @Auth
    @RequestMapping(value = "/app/tenpay/prepay", method = RequestMethod.POST)
    public @ResponseBody Map<String, Object> getOrder(HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        Map<String, Object> map = new HashMap<String, Object>();
        // 获取生成预支付订单的请求类
        PrepayIdRequestHandler prepayReqHandler = new PrepayIdRequestHandler(request, response);
        String totalFee = request.getParameter("total_fee");
        int total_fee=(int) (Float.valueOf(totalFee)*100);
        System.out.println("total:"+total_fee);
        System.out.println("total_fee:" + total_fee);
        prepayReqHandler.setParameter("appid", ConstantUtil.APP_ID);
        prepayReqHandler.setParameter("body", ConstantUtil.BODY);
        prepayReqHandler.setParameter("mch_id", ConstantUtil.MCH_ID);
        String nonce_str = WXUtil.getNonceStr();
        prepayReqHandler.setParameter("nonce_str", nonce_str);
        prepayReqHandler.setParameter("notify_url", ConstantUtil.NOTIFY_URL);
        out_trade_no = String.valueOf(UUID.next());
        prepayReqHandler.setParameter("out_trade_no", out_trade_no);
        prepayReqHandler.setParameter("spbill_create_ip", request.getRemoteAddr());
        String timestamp = WXUtil.getTimeStamp();
        prepayReqHandler.setParameter("time_start", timestamp);
        System.out.println(String.valueOf(total_fee));
        prepayReqHandler.setParameter("total_fee", String.valueOf(total_fee));
        prepayReqHandler.setParameter("trade_type", "APP");
        /**
         * 注意签名（sign）的生成方式，具体见官方文档（传参都要参与生成签名，且参数名按照字典序排序，最后接上APP_KEY,转化成大写）
         */
        prepayReqHandler.setParameter("sign", prepayReqHandler.createMD5Sign());
        prepayReqHandler.setGateUrl(ConstantUtil.GATEURL);
        String prepayid = prepayReqHandler.sendPrepay();
        // 若获取prepayid成功，将相关信息返回客户端
        if (prepayid != null && !prepayid.equals("")) {
            PayRecord payRecord=new PayRecord();
            AppCustomer appCustomer=(AppCustomer) request.getSession().getAttribute("appCustomer");
            payRecord.setPhone(appCustomer.getPhone());
            payRecord.setSerialId(Long.valueOf(out_trade_no));
            payRecord.setType((byte)2);
            payRecord.setGenerateTime(new Date());
            payRecord.setTotalAmount(Float.valueOf(total_fee)/100);
            payRecordService.insert(payRecord);
            String signs = "appid=" + ConstantUtil.APP_ID + "&noncestr=" + nonce_str + "&package=Sign=WXPay&partnerid="
                    + ConstantUtil.PARTNER_ID + "&prepayid=" + prepayid + "&timestamp=" + timestamp + "&key="
                    + ConstantUtil.APP_KEY;
            map.put("code", 0);
            map.put("info", "success");
            map.put("prepayid", prepayid);
            /**
             * 签名方式与上面类似
             */
            map.put("sign", MD5Util.MD5Encode(signs, "utf8").toUpperCase());
            map.put("appid", ConstantUtil.APP_ID);
            map.put("timestamp", timestamp);  //等于请求prepayId时的time_start
            map.put("noncestr", nonce_str);   //与请求prepayId时值一致
            map.put("package", "Sign=WXPay");  //固定常量
            map.put("partnerid", ConstantUtil.PARTNER_ID);
        } else {
            map.put("code", 1);
            map.put("info", "获取prepayid失败");
        }
        return map;
    }

    /**
     * 接收微信支付成功通知
     * @param request
     * @param response
     * @throws IOException
     */
    @Auth
    @RequestMapping(value = "/app/tenpay/notify")
    public void getnotify(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        System.out.println("微信支付回调");
        PrintWriter writer = response.getWriter();
        InputStream inStream = request.getInputStream();
        ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while ((len = inStream.read(buffer)) != -1) {
            outSteam.write(buffer, 0, len);
        }
        outSteam.close();
        inStream.close();
        String result = new String(outSteam.toByteArray(), "utf-8");
        System.out.println("微信支付通知结果：" + result);
        Map<String, String> map = null;
        try {
            /**
             * 解析微信通知返回的信息
             */
            map = XMLUtil.doXMLParse(result);
        } catch (JDOMException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("=========:"+result);
        // 若支付成功，则告知微信服务器收到通知
        if (map.get("return_code").equals("SUCCESS")) {
            if (map.get("result_code").equals("SUCCESS")) {
                System.out.println("充值成功！");
                PayRecord payRecord=payRecordService.get(Long.valueOf(map.get("out_trade_no")));
                System.out.println("订单号："+Long.valueOf(map.get("out_trade_no")));
                System.out.println("payRecord.getPayTime():"+payRecord.getPayTime()==null+","+payRecord.getPayTime());
                //判断通知是否已处理，若已处理，则不予处理
                if(payRecord.getPayTime()==null){
                    System.out.println("通知微信后台");
                    payRecord.setPayTime(new Date());
                    String phone=payRecord.getPhone();
                    AppCustomer appCustomer=appCustomerService.getByPhone(phone);
                    float balance=appCustomer.getBalance();
                    balance+=Float.valueOf(map.get("total_fee"))/100;
                    appCustomer.setBalance(balance);
                    appCustomerService.update(appCustomer);
                    payRecordService.update(payRecord);
                    String notifyStr = XMLUtil.setXML("SUCCESS", "");
                    writer.write(notifyStr);
                    writer.flush();
                }
            }
        }
    }

}