微信小程序支付（java后端）

 

第一步

进入小程序，下单，请求下单支付，调用小程序登录API来获取Openid（https://mp.weixin.qq.com/debug/w ... .html#wxloginobject）,生成商户订单，这些都是在小程序端完成的业务。

小程序端代码 
// pages/pay/pay.js 
var app = getApp(); 
Page({ 
    data: {}, 
    onLoad: function (options) { 
        // 页面初始化 options为页面跳转所带来的参数 
    }, 
    /* 微信支付 */ 
    wxpay: function () { 
        var that = this 
        //登陆获取code 
        wx.login({ 
            success: function (res) { 
                console.log(res.code) 
                //获取openid 
                that.getOpenId(res.code) 
            } 
        }); 
    }, 
    getOpenId: function (code) { 
        var that = this; 
        wx.request({ 
            url: "https://api.weixin.qq.com/sns/jscode2session?appid=wxa142513e524e496c&secret=5d6a7d86048884e7c60f84f7aa85253c&js_code=" + code + "&grant_type=authorization_code", 
            data: {}, 
            method: 'GET', 
            success: function (res) { 
                console.log('返回openId') 
                console.log(res.data) 
                that.generateOrder(res.data.openid) 
            }, 
            fail: function () { 
                // fail 
            }, 
            complete: function () { 
                // complete 
            } 
        }) 
    }, 
    /**生成商户订单 */ 
    generateOrder: function (openid) { 
        var that = this 
        //统一支付 
        wx.request({ 
            url: 'http://localhost:8070/RMS/pay_pay.action', 
            method: 'GET', 
            data: { 
                total_fee: '5', 
                body: '支付测试', 
                attach:'真假酒水' 
            }, 
            success: function (res) { 
                console.log(res) 
                var pay = res.data 
                //发起支付 
                var timeStamp = pay[0].timeStamp; 
                console.log("timeStamp:"+timeStamp) 
                var packages = pay[0].package; 
                console.log("package:"+packages) 
                var paySign = pay[0].paySign; 
                console.log("paySign:"+paySign) 
                var nonceStr = pay[0].nonceStr; 
                 console.log("nonceStr:"+nonceStr) 
                var param = { "timeStamp": timeStamp, "package": packages, "paySign": paySign, "signType": "MD5", "nonceStr": nonceStr }; 
                that.pay(param) 
            }, 
        }) 
    }, 
    /* 支付   */ 
    pay: function (param) { 
        console.log("支付") 
        console.log(param) 
        wx.requestPayment({ 
            timeStamp: param.timeStamp, 
            nonceStr: param.nonceStr, 
            package: param.package, 
            signType: param.signType, 
            paySign: param.paySign, 
            success: function (res) { 
                // success 
                console.log("支付") 
                console.log(res) 
                wx.navigateBack({ 
                    delta: 1, // 回退前 delta(默认为1) 页面 
                    success: function (res) { 
                        wx.showToast({ 
                            title: '支付成功', 
                            icon: 'success', 
                            duration: 2000 
                        }) 
                    }, 
                    fail: function () { 
                        // fail 
                    }, 
                    complete: function () { 
                        // complete 
                    } 
                }) 
            }, 
            fail: function (res) { 
                // fail 
                console.log("支付失败") 
                console.log(res) 
            }, 
            complete: function () { 
                // complete 
                console.log("pay complete") 
            } 
        }) 
    } 
}) 
复制代码 
第二步

调用支付统一下单API来获取prepay_id，并将小程序调起支付数据需要签名的字段appId，timeStamp，nonceStr，package再次签名（https://pay.weixin.qq.com/wiki/d ... ter=7_7&index=3）

后台代码 
package cn.it.shop.action; 
import java.io.ByteArrayInputStream; 
import java.io.InputStream; 
import java.io.UnsupportedEncodingException; 
import java.text.SimpleDateFormat; 
import java.util.Date; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import org.dom4j.Document; 
import org.dom4j.DocumentException; 
import org.dom4j.Element; 
import org.dom4j.io.SAXReader; 
import cn.it.shop.util.MessageUtil; 
import cn.it.shop.util.PayUtil; 
import cn.it.shop.util.PaymentPo; 
import cn.it.shop.util.UUIDHexGenerator; 
import net.sf.json.JSONArray; 
import net.sf.json.JSONObject; 
/** 
* @author 
* @version 创建时间：2017年1月21日 下午4:59:03 
* 小程序端请求的后台action，返回签名后的数据传到前台 
*/ 
public class PayAction { 
    private String total_fee;//总金额 
    private String body;//商品描述 
    private String detail;//商品详情    
    private String attach;//附加数据 
    private String time_start;//交易起始时间 
    private String time_expire;//交易结束时间 
    private String openid;//用户标识 
    private JSONArray jsonArray=new JSONArray(); 
    public String pay() throws UnsupportedEncodingException, DocumentException{ 
         body = new String(body.getBytes("UTF-8"),"ISO-8859-1");  
        String appid = "替换为自己的小程序ID";//小程序ID 
        String mch_id = "替换为自己的商户号";//商户号 
        String nonce_str = UUIDHexGenerator.generate();//随机字符串 
        String today = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()); 
        String code = PayUtil.createCode(8); 
        String out_trade_no = mch_id+today+code;//商户订单号 
        String spbill_create_ip = "替换为自己的终端IP";//终端IP 
        String notify_url = "http://www.weixin.qq.com/wxpay/pay.php";//通知地址 
        String trade_type = "JSAPI";//交易类型  
        String openid="替换为用户的openid";//用户标识 
        /**/ 
        PaymentPo paymentPo = new PaymentPo(); 
        paymentPo.setAppid(appid); 
        paymentPo.setMch_id(mch_id); 
        paymentPo.setNonce_str(nonce_str); 
        String newbody=new String(body.getBytes("ISO-8859-1"),"UTF-8");//以utf-8编码放入paymentPo，微信支付要求字符编码统一采用UTF-8字符编码 
        paymentPo.setBody(newbody); 
        paymentPo.setOut_trade_no(out_trade_no); 
        paymentPo.setTotal_fee(total_fee); 
        paymentPo.setSpbill_create_ip(spbill_create_ip); 
        paymentPo.setNotify_url(notify_url); 
        paymentPo.setTrade_type(trade_type); 
        paymentPo.setOpenid(openid); 
        // 把请求参数打包成数组 
        Map sParaTemp = new HashMap(); 
        sParaTemp.put("appid", paymentPo.getAppid()); 
        sParaTemp.put("mch_id", paymentPo.getMch_id()); 
        sParaTemp.put("nonce_str", paymentPo.getNonce_str()); 
        sParaTemp.put("body",  paymentPo.getBody()); 
        sParaTemp.put("out_trade_no", paymentPo.getOut_trade_no()); 
        sParaTemp.put("total_fee",paymentPo.getTotal_fee()); 
        sParaTemp.put("spbill_create_ip", paymentPo.getSpbill_create_ip()); 
        sParaTemp.put("notify_url",paymentPo.getNotify_url()); 
        sParaTemp.put("trade_type", paymentPo.getTrade_type()); 
        sParaTemp.put("openid", paymentPo.getOpenid()); 
        // 除去数组中的空值和签名参数 
        Map sPara = PayUtil.paraFilter(sParaTemp); 
        String prestr = PayUtil.createLinkString(sPara); // 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串 
        String key = "&key=替换为商户支付密钥"; // 商户支付密钥 
        //MD5运算生成签名 
        String mysign = PayUtil.sign(prestr, key, "utf-8").toUpperCase(); 
        paymentPo.setSign(mysign); 
        //打包要发送的xml 
        String respXml = MessageUtil.messageToXML(paymentPo); 
        // 打印respXml发现，得到的xml中有“__”不对，应该替换成“_” 
        respXml = respXml.replace("__", "_"); 
        String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";//统一下单API接口链接 
        String param = respXml; 
        //String result = SendRequestForUrl.sendRequest(url, param);//发起请求 
        String result =PayUtil.httpRequest(url, "POST", param); 
        // 将解析结果存储在HashMap中 
        Map map = new HashMap(); 
         InputStream in=new ByteArrayInputStream(result.getBytes());  
        // 读取输入流 
        SAXReader reader = new SAXReader(); 
        Document document = reader.read(in); 
        // 得到xml根元素 
        Element root = document.getRootElement(); 
        // 得到根元素的所有子节点 
        @SuppressWarnings("unchecked") 
        List elementList = root.elements(); 
        for (Element element : elementList) { 
            map.put(element.getName(), element.getText()); 
        } 
        // 返回信息 
        String return_code = map.get("return_code");//返回状态码 
        String return_msg = map.get("return_msg");//返回信息 
        System.out.println("return_msg"+return_msg); 
        JSONObject JsonObject=new JSONObject() ; 
        if(return_code=="SUCCESS"||return_code.equals(return_code)){ 
            // 业务结果 
            String prepay_id = map.get("prepay_id");//返回的预付单信息 
            String nonceStr=UUIDHexGenerator.generate(); 
            JsonObject.put("nonceStr", nonceStr); 
            JsonObject.put("package", "prepay_id="+prepay_id); 
            Long timeStamp= System.currentTimeMillis()/1000; 
            JsonObject.put("timeStamp", timeStamp+""); 
            String stringSignTemp = "appId="+appid+"&nonceStr=" + nonceStr + "&package=prepay_id=" + prepay_id+ "&signType=MD5&timeStamp=" + timeStamp; 
            //再次签名 
            String paySign=PayUtil.sign(stringSignTemp, "&key=替换为自己的密钥", "utf-8").toUpperCase(); 
            JsonObject.put("paySign", paySign); 
            jsonArray.add(JsonObject); 
        } 
        return "pay"; 
    } 
    public String getTotal_fee() { 
        return total_fee; 
    } 
    public void setTotal_fee(String total_fee) { 
        this.total_fee = total_fee; 
    } 
    public String getBody() { 
        return body; 
    } 
    public void setBody(String body) { 
        this.body = body; 
    } 
    public JSONArray getJsonArray() { 
        return jsonArray; 
    } 
    public void setJsonArray(JSONArray jsonArray) { 
        this.jsonArray = jsonArray; 
    } 
    public String getDetail() { 
        return detail; 
    } 
    public void setDetail(String detail) { 
        this.detail = detail; 
    } 
    public String getAttach() { 
        return attach; 
    } 
    public void setAttach(String attach) { 
        this.attach = attach; 
    } 
    public String getTime_start() { 
        return time_start; 
    } 
    public void setTime_start(String time_start) { 
        this.time_start = time_start; 
    } 
    public String getTime_expire() { 
        return time_expire; 
    } 
    public void setTime_expire(String time_expire) { 
        this.time_expire = time_expire; 
    } 
    public String getOpenid() { 
        return openid; 
    } 
    public void setOpenid(String openid) { 
        this.openid = openid; 
    } 
} 
复制代码 
后台业务逻辑涉及到的工具类及参数封装类 
MessageUtil 
package cn.it.shop.util; 
import java.io.IOException; 
import java.io.Writer; 
import java.util.HashMap; 
import java.util.List; 
import javax.servlet.http.HttpServletRequest; 
import org.dom4j.Document; 
import org.dom4j.Element; 
import org.dom4j.io.SAXReader; 
import com.thoughtworks.xstream.XStream; 
import com.thoughtworks.xstream.core.util.QuickWriter; 
import com.thoughtworks.xstream.io.HierarchicalStreamWriter; 
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter; 
import com.thoughtworks.xstream.io.xml.XppDriver; 
public class MessageUtil { 
    public static HashMap parseXML(HttpServletRequest request) throws Exception, IOException{ 
        HashMap map=new HashMap(); 
        // 通过IO获得Document 
        SAXReader reader = new SAXReader(); 
        Document doc = reader.read(request.getInputStream()); 
        //得到xml的根节点 
        Element root=doc.getRootElement(); 
        recursiveParseXML(root,map); 
        return map; 
    } 
    private static void recursiveParseXML(Element root,HashMap map){ 
        //得到根节点的子节点列表 
        List elementList=root.elements(); 
        //判断有没有子元素列表 
        if(elementList.size()==0){ 
            map.put(root.getName(), root.getTextTrim()); 
        } 
        else{ 
            //遍历 
            for(Element e:elementList){ 
                recursiveParseXML(e,map); 
            } 
        } 
    } 
    private static XStream xstream = new XStream(new XppDriver() { 
        public HierarchicalStreamWriter createWriter(Writer out) { 
            return new PrettyPrintWriter(out) { 
                // 对所有xml节点都增加CDATA标记 
                boolean cdata = true; 
                public void startNode(String name, Class clazz) { 
                    super.startNode(name, clazz); 
                } 
                protected void writeText(QuickWriter writer, String text) { 
                    if (cdata) { 
                        writer.write("                        writer.write(text); 
                        writer.write("]]>"); 
                    } else { 
                        writer.write(text); 
                    } 
                } 
            }; 
        } 
    }); 
    public static String messageToXML(PaymentPo paymentPo){ 
        xstream.alias("xml",PaymentPo.class); 
        return xstream.toXML(paymentPo); 
    } 
} 
PaymentPo//封装支付参数实体 
package cn.it.shop.util; 
/** 
* @author 
* @version 创建时间：2017年1月21日 下午4:20:52 
* 类说明 
*/ 
public class PaymentPo { 
    private String appid;//小程序ID 
    private String mch_id;//商户号 
    private String device_info;//设备号 
    private String nonce_str;//随机字符串 
    private String sign;//签名 
    private String body;//商品描述  
    private String detail;//商品详情    
    private String attach;//附加数据 
    private String out_trade_no;//商户订单号 
    private String fee_type;//货币类型 
    private String spbill_create_ip;//终端IP 
    private String time_start;//交易起始时间 
    private String time_expire;//交易结束时间 
    private String goods_tag;//商品标记 
    private String total_fee;//总金额 
    private String notify_url;//通知地址    
    private String trade_type;//交易类型    
    private String limit_pay;//指定支付方式 
    private String openid;//用户标识 
    public String getAppid() { 
        return appid; 
    } 
    public void setAppid(String appid) { 
        this.appid = appid; 
    } 
    public String getMch_id() { 
        return mch_id; 
    } 
    public void setMch_id(String mch_id) { 
        this.mch_id = mch_id; 
    } 
    public String getNonce_str() { 
        return nonce_str; 
    } 
    public void setNonce_str(String nonce_str) { 
        this.nonce_str = nonce_str; 
    } 
    public String getSign() { 
        return sign; 
    } 
    public void setSign(String sign) { 
        this.sign = sign; 
    } 
    public String getBody() { 
        return body; 
    } 
    public void setBody(String body) { 
        this.body = body; 
    } 
    public String getOut_trade_no() { 
        return out_trade_no; 
    } 
    public void setOut_trade_no(String out_trade_no) { 
        this.out_trade_no = out_trade_no; 
    } 
    public String getTotal_fee() { 
        return total_fee; 
    } 
    public void setTotal_fee(String total_fee) { 
        this.total_fee = total_fee; 
    } 
    public String getNotify_url() { 
        return notify_url; 
    } 
    public void setNotify_url(String notify_url) { 
        this.notify_url = notify_url; 
    } 
    public String getTrade_type() { 
        return trade_type; 
    } 
    public void setTrade_type(String trade_type) { 
        this.trade_type = trade_type; 
    } 
    public String getOpenid() { 
        return openid; 
    } 
    public void setOpenid(String openid) { 
        this.openid = openid; 
    } 
    public String getSpbill_create_ip() { 
        return spbill_create_ip; 
    } 
    public void setSpbill_create_ip(String spbill_create_ip) { 
        this.spbill_create_ip = spbill_create_ip; 
    } 
    public String getDevice_info() { 
        return device_info; 
    } 
    public void setDevice_info(String device_info) { 
        this.device_info = device_info; 
    } 
    public String getDetail() { 
        return detail; 
    } 
    public void setDetail(String detail) { 
        this.detail = detail; 
    } 
    public String getAttach() { 
        return attach; 
    } 
    public void setAttach(String attach) { 
        this.attach = attach; 
    } 
    public String getFee_type() { 
        return fee_type; 
    } 
    public void setFee_type(String fee_type) { 
        this.fee_type = fee_type; 
    } 
    public String getTime_start() { 
        return time_start; 
    } 
    public void setTime_start(String time_start) { 
        this.time_start = time_start; 
    } 
    public String getTime_expire() { 
        return time_expire; 
    } 
    public void setTime_expire(String time_expire) { 
        this.time_expire = time_expire; 
    } 
    public String getGoods_tag() { 
        return goods_tag; 
    } 
    public void setGoods_tag(String goods_tag) { 
        this.goods_tag = goods_tag; 
    } 
    public String getLimit_pay() { 
        return limit_pay; 
    } 
    public void setLimit_pay(String limit_pay) { 
        this.limit_pay = limit_pay; 
    } 
} 
PayUtil 
package cn.it.shop.util; 
import java.io.BufferedReader; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStream; 
import java.io.UnsupportedEncodingException; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.util.ArrayList; 
import java.util.Collections; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import org.apache.commons.codec.digest.DigestUtils; 
/** 
* @author 
* @version 创建时间：2017年1月17日 下午7:46:29 类说明 
*/ 
public class PayUtil { 
    /** 
     * 签名字符串 
     * @param text需要签名的字符串 
     * @param key 密钥 
     * @param input_charset编码格式 
     * @return 签名结果 
     */ 
    public static String sign(String text, String key, String input_charset) { 
        text = text + key; 
        return DigestUtils.md5Hex(getContentBytes(text, input_charset)); 
    } 
    /** 
     * 签名字符串 
     *  @param text需要签名的字符串 
     * @param sign 签名结果 
     * @param key密钥 
     * @param input_charset 编码格式 
     * @return 签名结果 
     */ 
    public static boolean verify(String text, String sign, String key, String input_charset) { 
        text = text + key; 
        String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset)); 
        if (mysign.equals(sign)) { 
            return true; 
        } else { 
            return false; 
        } 
    } 
    /** 
     * @param content 
     * @param charset 
     * @return 
     * @throws SignatureException 
     * @throws UnsupportedEncodingException 
     */ 
    public static byte[] getContentBytes(String content, String charset) { 
        if (charset == null || "".equals(charset)) { 
            return content.getBytes(); 
        } 
        try { 
            return content.getBytes(charset); 
        } catch (UnsupportedEncodingException e) { 
            throw new RuntimeException("MD5签名过程◇◇现错误,指定的编码集不对,您目前指定的编码集是:" + charset); 
        } 
    } 
    /** 
     * 生成6位或10位随机数 param codeLength(多少位) 
     * @return 
     */ 
    public static String createCode(int codeLength) { 
        String code = ""; 
        for (int i = 0; i < codeLength; i++) { 
            code += (int) (Math.random() * 9); 
        } 
        return code; 
    } 
    private static boolean isValidChar(char ch) { 
        if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) 
            return true; 
        if ((ch >= 0x4e00 && ch <= 0x7fff) || (ch >= 0x8000 && ch <= 0x952f)) 
            return true;// 简体中文汉字编码 
        return false; 
    } 
    /** 
     * 除去数组中的空值和签名参数 
     * @param sArray 签名参数组 
     * @return 去掉空值与签名参数后的新签名参数组 
     */ 
    public static Map paraFilter(Map sArray) { 
        Map result = new HashMap(); 
        if (sArray == null || sArray.size() <= 0) { 
            return result; 
        } 
        for (String key : sArray.keySet()) { 
            String value = sArray.get(key); 
            if (value == null || value.equals("") || key.equalsIgnoreCase("sign") 
                    || key.equalsIgnoreCase("sign_type")) { 
                continue; 
            } 
            result.put(key, value); 
        } 
        return result; 
    } 
    /** 
     * 把数组所有元素排序，并按照“参数=参数值”的模式用“&”字符拼接成字符串 
     * @param params 需要排序并参与字符拼接的参数组 
     * @return 拼接后字符串 
     */ 
    public static String createLinkString(Map params) { 
        List keys = new ArrayList(params.keySet()); 
        Collections.sort(keys); 
        String prestr = ""; 
        for (int i = 0; i < keys.size(); i++) { 
            String key = keys.get(i); 
            String value = params.get(key); 
            if (i == keys.size() - 1) {// 拼接时，不包括最后一个&字符 
                prestr = prestr + key + "=" + value; 
            } else { 
                prestr = prestr + key + "=" + value + "&"; 
            } 
        } 
        return prestr; 
    } 
    /** 
     * 
     * @param requestUrl请求地址 
     * @param requestMethod请求方法 
     * @param outputStr参数 
     */ 
    public static String httpRequest(String requestUrl,String requestMethod,String outputStr){ 
        // 创建SSLContext 
        StringBuffer buffer=null; 
        try{ 
        URL url = new URL(requestUrl); 
        HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
        conn.setRequestMethod(requestMethod); 
        conn.setDoOutput(true); 
        conn.setDoInput(true); 
        conn.connect(); 
        //往服务器端写内容 
        if(null !=outputStr){ 
            OutputStream os=conn.getOutputStream(); 
            os.write(outputStr.getBytes("utf-8")); 
            os.close(); 
        } 
        // 读取服务器端返回的内容 
        InputStream is = conn.getInputStream(); 
        InputStreamReader isr = new InputStreamReader(is, "utf-8"); 
        BufferedReader br = new BufferedReader(isr); 
        buffer = new StringBuffer(); 
        String line = null; 
        while ((line = br.readLine()) != null) { 
                      buffer.append(line); 
        } 
        }catch(Exception e){ 
            e.printStackTrace(); 
        } 
        return buffer.toString(); 
        }   
    public static String urlEncodeUTF8(String source){ 
        String result=source; 
        try { 
            result=java.net.URLEncoder.encode(source, "UTF-8"); 
        } catch (UnsupportedEncodingException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
        return result; 
    } 
} 
UUIDHexGenerator 
package cn.it.shop.util; 
import java.net.InetAddress; 
/** 
* @author 
* @version 创建时间：2017年1月17日 下午7:45:06 类说明 
*/ 
public class UUIDHexGenerator { 
    private static String sep = ""; 
    private static final int IP; 
    private static short counter = (short) 0; 
    private static final int JVM = (int) (System.currentTimeMillis() >>> ; 
    private static UUIDHexGenerator uuidgen = new UUIDHexGenerator(); 
    static { 
        int ipadd; 
        try { 
            ipadd = toInt(InetAddress.getLocalHost().getAddress()); 
        } catch (Exception e) { 
            ipadd = 0; 
        } 
        IP = ipadd; 
    } 
    public static UUIDHexGenerator getInstance() { 
        return uuidgen; 
    } 
    public static int toInt(byte[] bytes) { 
        int result = 0; 
        for (int i = 0; i < 4; i++) { 
            result = (result <<  - Byte.MIN_VALUE + (int) bytes; 
        } 
        return result; 
    } 
    protected static String format(int intval) { 
        String formatted = Integer.toHexString(intval); 
        StringBuffer buf = new StringBuffer("00000000"); 
        buf.replace(8 - formatted.length(), 8, formatted); 
        return buf.toString(); 
    } 
    protected static String format(short shortval) { 
        String formatted = Integer.toHexString(shortval); 
        StringBuffer buf = new StringBuffer("0000"); 
        buf.replace(4 - formatted.length(), 4, formatted); 
        return buf.toString(); 
    } 
    protected static int getJVM() { 
        return JVM; 
    } 
    protected synchronized static short getCount() { 
        if (counter < 0) { 
            counter = 0; 
        } 
        return counter++; 
    } 
    protected static int getIP() { 
        return IP; 
    } 
    protected static short getHiTime() { 
        return (short) (System.currentTimeMillis() >>> 32); 
    } 
    protected static int getLoTime() { 
        return (int) System.currentTimeMillis(); 
    } 
    public static String generate() { 
        return new StringBuffer(36).append(format(getIP())).append(sep).append(format(getJVM())).append(sep) 
                .append(format(getHiTime())).append(sep).append(format(getLoTime())).append(sep) 
                .append(format(getCount())).toString(); 
    } 
    /** 
     * @param args 
     */ 
    public static void main(String[] args) { 
        String id=""; 
        UUIDHexGenerator uuid = UUIDHexGenerator.getInstance(); 
        /* 
        for (int i = 0; i < 100; i++) { 
            id = uuid.generate(); 
        }*/ 
        id = uuid.generate(); 
        System.out.println(id); 
    } 
}

 

转自：http://www.wang1314.com/doc/topic-1588537-1.html