微信扫码支付功能详细教程————Java

前言  首先声明 我并非原创 原创是 http://blog.csdn.net/wangqiuyun/article/details/51241064 我只是在前辈的基础 加以解释说明 还有自己的一些思路

引用的第三方jar包 jdom-1.1.3.jar、jaxen-1.1.6.jar。（直接百度就可以找到了.）

大致流程

1.根据用户需求生成订单状态为未支付

2.用相应的参数请求微信接口 获取支付url

3.把获取的url 用工具生成二维码

4.支付回执  {1.验证签名 2.处理业务流程（例如：更改订单状态为已支付  生成相应的流水记录信息） 3.向微信发送消息 表示收到消息}

5.扫码页面最后处理 （用定时函数不停的获取该订单编号的状态 如果是已付款 弹出支付成功 跳转到相应的页面）

大致流程就是如此 下面不废话贴代码

public String weixin_pay(Integer orderId) throws Exception {
        TPredepositOrder predepositOrder=predepositOrderService.getPredepositOrderInfoById(orderId);//根据订单号获取订单信息
        // 账号信息
        String appid = Constants.appid;           // appid  开发者id 登录公众号》开发》基本配置 AppID(应用ID)后面就是
        String mch_id =Constants.WEIXIN_MCH_ID;   // 商业号  不知道的问你老板要
        String key = Constants.WEIXIN_PAY_KEY;    // key    登录微信商户号后，找到账户设置 -> 密码安全 -> API安全 -> API密钥；不会的这个有个地址点开看 http://www.2cto.com/weixin/201506/412421.html
     
        //根据时间生成随机字符串
        String currTime = PayCommonUtil.getCurrTime();
        String strTime = currTime.substring(8, currTime.length());
        String strRandom = PayCommonUtil.buildRandom(4) + "";
        String nonce_str = strTime + strRandom;  
 
        //价格处理
        Double price=predepositOrder.getPreDeposit();
        int total_fee=(int) (price*100);
        String order_price =total_fee+"";           // 价格   注意：价格的单位是分  
 
        String body = "天天酷跑-游戏充值";            // 商品名称 格式必须是 公司名称-商品名称
        String out_trade_no = orderId.toString();   // 订单号  
 
        // 获取发起电脑 ip
        String ip=InetAddress.getLocalHost().toString();
        ip=ip.substring(ip.lastIndexOf('/')+1,ip.length());
        System.out.println("本机的IP = " +ip);
        String spbill_create_ip =ip;
        // 回调接口回调地址
        String notify_url = Constants.NOTIFY_URL;
        String trade_type = "NATIVE";  //支付类型 网页扫码支付就用这个 不解释
 
        SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>();
        packageParams.put("appid", appid);
        packageParams.put("body", body);
        packageParams.put("mch_id", mch_id);
        packageParams.put("nonce_str",nonce_str);
        packageParams.put("notify_url", notify_url);
        packageParams.put("out_trade_no",out_trade_no);
        packageParams.put("spbill_create_ip", spbill_create_ip);
        packageParams.put("total_fee", order_price);
        packageParams.put("trade_type", trade_type);
        String sign = PayCommonUtil.createSign("UTF-8",packageParams,key);
        packageParams.put("sign",sign);
        String requestXML = PayCommonUtil.getRequestXml(packageParams);
        System.out.println(requestXML);
        String resXml = HttpUtil.postData("https://api.mch.weixin.qq.com/pay/unifiedorder",requestXML);//这个是微信返回url的接口地址
        System.out.println("返回的xml信息"+resXml);
        Map map = XMLUtil.doXMLParse(resXml);
        String urlCode = (String) map.get("code_url");
        System.out.println("支付地址"+urlCode);
        return urlCode;
} 

回调地址 设置：登录微信支付后台》微信支付》开发配置  支付回调接口地址 回调地址ip必须是域名也就是固定ip不然微信访问不到无法进入回调

这个方法是返回一个支付url下面是生成一个二维码

<div style="margin-top: 10px;width:500px;height:500px;" id="output"></div>
<script type="text/javascript" src="weixin/js/jquery.qrcode-0.12.0.min.js"></script><--!引入生成二维码的js--->
<script type="text/javascript">
      var url = '${urlCode}';
      jQuery('#output').qrcode({render: "table",width:500,height:500,correctLevel:0,text:url});
 
      window.setInterval("selectInfo()",10000);
      function selectInfo(){
        //用定时函数不停的获取该订单编号的状态 如果是已付款 弹出支付成功 跳转到相应的页面
      }
   </script>

生成二维码的 js

1 2

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"+t);return i}(),n="?".charCodeAt(0);return function(r){for(var t=new Array,o=0;o<r.length;o+=1){var i=r.charCodeAt(o);if(128>i)t.push(i);else{var a=e[r.charAt(o)];"number"==typeof a?(255&a)==a?t.push(a):(t.push(a>>>8),t.push(255&a)):t.push(n)}}return t}};var e={MODE_NUMBER:1,MODE_ALPHA_NUM:2,MODE_8BIT_BYTE:4,MODE_KANJI:8},n={L:1,M:0,Q:3,H:2},o={PATTERN000:0,PATTERN001:1,PATTERN010:2,PATTERN011:3,PATTERN100:4,PATTERN101:5,PATTERN110:6,PATTERN111:7},i=function(){var t=[[],[6,18],[6,22],[6,26],[6,30],[6,34],[6,22,38],[6,24,42],[6,26,46],[6,28,50],[6,30,54],[6,32,58],[6,34,62],[6,26,46,66],[6,26,48,70],[6,26,50,74],[6,30,54,78],[6,30,56,82],[6,30,58,86],[6,34,62,90],[6,28,50,72,94],[6,26,50,74,98],[6,30,54,78,102],[6,28,54,80,106],[6,32,58,84,110],[6,30,58,86,114],[6,34,62,90,118],[6,26,50,74,98,122],[6,30,54,78,102,126],[6,26,52,78,104,130],[6,30,56,82,108,134],[6,34,60,86,112,138],[6,30,58,86,114,142],[6,34,62,90,118,146],[6,30,54,78,102,126,150],[6,24,50,76,102,128,154],[6,28,54,80,106,132,158],[6,32,58,84,110,136,162],[6,26,54,82,110,138,166],[6,30,58,86,114,142,170]],n=1335,i=7973,u=21522,f={},c=function(r){for(var t=0;0!=r;)t+=1,r>>>=1;return t};return f.getBCHTypeInfo=function(r){for(var t=r<<10;c(t)-c(n)>=0;)t^=n<<c(t)-c(n);return(r<<10|t)^u},f.getBCHTypeNumber=function(r){for(var t=r<<12;c(t)-c(i)>=0;)t^=i<<c(t)-c(i);return r<<12|t},f.getPatternPosition=function(r){return t[r-1]},f.getMaskFunction=function(r){switch(r){case o.PATTERN000:return function(r,t){return(r+t)%2==0};case o.PATTERN001:return function(r,t){return r%2==0};case o.PATTERN010:return function(r,t){return t%3==0};case o.PATTERN011:return function(r,t){return(r+t)%3==0};case o.PATTERN100:return function(r,t){return(Math.floor(r/2)+Math.floor(t/3))%2==0};case o.PATTERN101:return function(r,t){return r*t%2+r*t%3==0};case o.PATTERN110:return function(r,t){return(r*t%2+r*t%3)%2==0};case o.PATTERN111:return function(r,t){return(r*t%3+(r+t)%2)%2==0};default:throw new Error("bad maskPattern:"+r)}},f.getErrorCorrectPolynomial=function(t){for(var e=r([1],0),n=0;t>n;n+=1)e=e.multiply(r([1,a.gexp(n)],0));return e},f.getLengthInBits=function(r,t){if(t>=1&&10>t)switch(r){case e.MODE_NUMBER:return 10;case e.MODE_ALPHA_NUM:return 9;case e.MODE_8BIT_BYTE:return 8;case e.MODE_KANJI:return 8;default:throw new Error("mode:"+r)}else if(27>t)switch(r){case e.MODE_NUMBER:return 12;case e.MODE_ALPHA_NUM:return 11;case e.MODE_8BIT_BYTE:return 16;case e.MODE_KANJI:return 10;default:throw new Error("mode:"+r)}else{if(!(41>t))throw new Error("type:"+t);switch(r){case e.MODE_NUMBER:return 14;case e.MODE_ALPHA_NUM:return 13;case e.MODE_8BIT_BYTE:return 16;case e.MODE_KANJI:return 12;default:throw new Error("mode:"+r)}}},f.getLostPoint=function(r){for(var t=r.getModuleCount(),e=0,n=0;t>n;n+=1)for(var o=0;t>o;o+=1){for(var i=0,a=r.isDark(n,o),u=-1;1>=u;u+=1)if(!(0>n+u||n+u>=t))for(var f=-1;1>=f;f+=1)0>o+f||o+f>=t||(0!=u||0!=f)&&a==r.isDark(n+u,o+f)&&(i+=1);i>5&&(e+=3+i-5)}for(var n=0;t-1>n;n+=1)for(var o=0;t-1>o;o+=1){var c=0;r.isDark(n,o)&&(c+=1),r.isDark(n+1,o)&&(c+=1),r.isDark(n,o+1)&&(c+=1),r.isDark(n+1,o+1)&&(c+=1),(0==c||4==c)&&(e+=3)}for(var n=0;t>n;n+=1)for(var o=0;t-6>o;o+=1)r.isDark(n,o)&&!r.isDark(n,o+1)&&r.isDark(n,o+2)&&r.isDark(n,o+3)&&r.isDark(n,o+4)&&!r.isDark(n,o+5)&&r.isDark(n,o+6)&&(e+=40);for(var o=0;t>o;o+=1)for(var n=0;t-6>n;n+=1)r.isDark(n,o)&&!r.isDark(n+1,o)&&r.isDark(n+2,o)&&r.isDark(n+3,o)&&r.isDark(n+4,o)&&!r.isDark(n+5,o)&&r.isDark(n+6,o)&&(e+=40);for(var l=0,o=0;t>o;o+=1)for(var n=0;t>n;n+=1)r.isDark(n,o)&&(l+=1);var g=Math.abs(100*l/t/t-50)/5;return e+=10*g},f}(),a=function(){for(var r=new Array(256),t=new Array(256),e=0;8>e;e+=1)r[e]=1<<e;for(var e=8;256>e;e+=1)r[e]=r[e-4]^r[e-5]^r[e-6]^r[e-8];for(var e=0;255>e;e+=1)t[r[e]]=e;var n={};return n.glog=function(r){if(1>r)throw new Error("glog("+r+")");return t[r]},n.gexp=function(t){for(;0>t;)t+=255;for(;t>=256;)t-=255;return r[t]},n}(),u=function(){var r=[[1,26,19],[1,26,16],[1,26,13],[1,26,9],[1,44,34],[1,44,28],[1,44,22],[1,44,16],[1,70,55],[1,70,44],[2,35,17],[2,35,13],[1,100,80],[2,50,32],[2,50,24],[4,25,9],[1,134,108],[2,67,43],[2,33,15,2,34,16],[2,33,11,2,34,12],[2,86,68],[4,43,27],[4,43,19],[4,43,15],[2,98,78],[4,49,31],[2,32,14,4,33,15],[4,39,13,1,40,14],[2,121,97],[2,60,38,2,61,39],[4,40,18,2,41,19],[4,40,14,2,41,15],[2,146,116],[3,58,36,2,59,37],[4,36,16,4,37,17],[4,36,12,4,37,13],[2,86,68,2,87,69],[4,69,43,1,70,44],[6,43,19,2,44,20],[6,43,15,2,44,16],[4,101,81],[1,80,50,4,81,51],[4,50,22,4,51,23],[3,36,12,8,37,13],[2,116,92,2,117,93],[6,58,36,2,59,37],[4,46,20,6,47,21],[7,42,14,4,43,15],[4,133,107],[8,59,37,1,60,38],[8,44,20,4,45,21],[12,33,11,4,34,12],[3,145,115,1,146,116],[4,64,40,5,65,41],[11,36,16,5,37,17],[11,36,12,5,37,13],[5,109,87,1,110,88],[5,65,41,5,66,42],[5,54,24,7,55,25],[11,36,12,7,37,13],[5,122,98,1,123,99],[7,73,45,3,74,46],[15,43,19,2,44,20],[3,45,15,13,46,16],[1,135,107,5,136,108],[10,74,46,1,75,47],[1,50,22,15,51,23],[2,42,14,17,43,15],[5,150,120,1,151,121],[9,69,43,4,70,44],[17,50,22,1,51,23],[2,42,14,19,43,15],[3,141,113,4,142,114],[3,70,44,11,71,45],[17,47,21,4,48,22],[9,39,13,16,40,14],[3,135,107,5,136,108],[3,67,41,13,68,42],[15,54,24,5,55,25],[15,43,15,10,44,16],[4,144,116,4,145,117],[17,68,42],[17,50,22,6,51,23],[19,46,16,6,47,17],[2,139,111,7,140,112],[17,74,46],[7,54,24,16,55,25],[34,37,13],[4,151,121,5,152,122],[4,75,47,14,76,48],[11,54,24,14,55,25],[16,45,15,14,46,16],[6,147,117,4,148,118],[6,73,45,14,74,46],[11,54,24,16,55,25],[30,46,16,2,47,17],[8,132,106,4,133,107],[8,75,47,13,76,48],[7,54,24,22,55,25],[22,45,15,13,46,16],[10,142,114,2,143,115],[19,74,46,4,75,47],[28,50,22,6,51,23],[33,46,16,4,47,17],[8,152,122,4,153,123],[22,73,45,3,74,46],[8,53,23,26,54,24],[12,45,15,28,46,16],[3,147,117,10,148,118],[3,73,45,23,74,46],[4,54,24,31,55,25],[11,45,15,31,46,16],[7,146,116,7,147,117],[21,73,45,7,74,46],[1,53,23,37,54,24],[19,45,15,26,46,16],[5,145,115,10,146,116],[19,75,47,10,76,48],[15,54,24,25,55,25],[23,45,15,25,46,16],[13,145,115,3,146,116],[2,74,46,29,75,47],[42,54,24,1,55,25],[23,45,15,28,46,16],[17,145,115],[10,74,46,23,75,47],[10,54,24,35,55,25],[19,45,15,35,46,16],[17,145,115,1,146,116],[14,74,46,21,75,47],[29,54,24,19,55,25],[11,45,15,46,46,16],[13,145,115,6,146,116],[14,74,46,23,75,47],[44,54,24,7,55,25],[59,46,16,1,47,17],[12,151,121,7,152,122],[12,75,47,26,76,48],[39,54,24,14,55,25],[22,45,15,41,46,16],[6,151,121,14,152,122],[6,75,47,34,76,48],[46,54,24,10,55,25],[2,45,15,64,46,16],[17,152,122,4,153,123],[29,74,46,14,75,47],[49,54,24,10,55,25],[24,45,15,46,46,16],[4,152,122,18,153,123],[13,74,46,32,75,47],[48,54,24,14,55,25],[42,45,15,32,46,16],[20,147,117,4,148,118],[40,75,47,7,76,48],[43,54,24,22,55,25],[10,45,15,67,46,16],[19,148,118,6,149,119],[18,75,47,31,76,48],[34,54,24,34,55,25],[20,45,15,61,46,16]],t=function(r,t){var e={};return e.totalCount=r,e.dataCount=t,e},e={},o=function(t,e){switch(e){case n.L:return r[4*(t-1)+0];case n.M:return r[4*(t-1)+1];case n.Q:return r[4*(t-1)+2];case n.H:return r[4*(t-1)+3];default:return void 0}};return e.getRSBlocks=function(r,e){var n=o(r,e);if("undefined"==typeof n)throw new Error("bad rs block @ typeNumber:"+r+"/errorCorrectLevel:"+e);for(var i=n.length/3,a=new Array,u=0;i>u;u+=1)for(var f=n[3*u+0],c=n[3*u+1],l=n[3*u+2],g=0;f>g;g+=1)a.push(t(c,l));return a},e}(),f=function(){var r=new Array,t=0,e={};return e.getBuffer=function(){return r},e.getAt=function(t){var e=Math.floor(t/8);return 1==(r[e]>>>7-t%8&1)},e.put=function(r,t){for(var n=0;t>n;n+=1)e.putBit(1==(r>>>t-n-1&1))},e.getLengthInBits=function(){return t},e.putBit=function(e){var n=Math.floor(t/8);r.length<=n&&r.push(0),e&&(r[n]|=128>>>t%8),t+=1},e},c=function(r){var n=e.MODE_8BIT_BYTE,o=t.stringToBytes(r),i={};return i.getMode=function(){return n},i.getLength=function(r){return o.length},i.write=function(r){for(var t=0;t<o.length;t+=1)r.put(o[t],8)},i},l=function(){var r=new Array,t={};return t.writeByte=function(t){r.push(255&t)},t.writeShort=function(r){t.writeByte(r),t.writeByte(r>>>8)},t.writeBytes=function(r,e,n){e=e||0,n=n||r.length;for(var o=0;n>o;o+=1)t.writeByte(r[o+e])},t.writeString=function(r){for(var e=0;e<r.length;e+=1)t.writeByte(r.charCodeAt(e))},t.toByteArray=function(){return r},t.toString=function(){var t="";t+="[";for(var e=0;e<r.length;e+=1)e>0&&(t+=","),t+=r[e];return t+="]"},t},g=function(){var r=0,t=0,e=0,n="",o={},i=function(r){n+=String.fromCharCode(a(63&r))},a=function(r){if(0>r);else{if(26>r)return 65+r;if(52>r)return 97+(r-26);if(62>r)return 48+(r-52);if(62==r)return 43;if(63==r)return 47}throw new Error("n:"+r)};return o.writeByte=function(n){for(r=r<<8|255&n,t+=8,e+=1;t>=6;)i(r>>>t-6),t-=6},o.flush=function(){if(t>0&&(i(r<<6-t),r=0,t=0),e%3!=0)for(var o=3-e%3,a=0;o>a;a+=1)n+="="},o.toString=function(){return n},o},s=function(r){var t=r,e=0,n=0,o=0,i={};i.read=function(){for(;8>o;){if(e>=t.length){if(0==o)return-1;throw new Error("unexpected end of file./"+o)}var r=t.charAt(e);if(e+=1,"="==r)return o=0,-1;r.match(/^\s$/)||(n=n<<6|a(r.charCodeAt(0)),o+=6)}var i=n>>>o-8&255;return o-=8,i};var a=function(r){if(r>=65&&90>=r)return r-65;if(r>=97&&122>=r)return r-97+26;if(r>=48&&57>=r)return r-48+52;if(43==r)return 62;if(47==r)return 63;throw new Error("c:"+r)};return i},h=function(r,t){var e=r,n=t,o=new Array(r*t),i={};i.setPixel=function(r,t,n){o[t*e+r]=n},i.write=function(r){r.writeString("GIF87a"),r.writeShort(e),r.writeShort(n),r.writeByte(128),r.writeByte(0),r.writeByte(0),r.writeByte(0),r.writeByte(0),r.writeByte(0),r.writeByte(255),r.writeByte(255),r.writeByte(255),r.writeString(","),r.writeShort(0),r.writeShort(0),r.writeShort(e),r.writeShort(n),r.writeByte(0);var t=2,o=u(t);r.writeByte(t);for(var i=0;o.length-i>255;)r.writeByte(255),r.writeBytes(o,i,255),i+=255;r.writeByte(o.length-i),r.writeBytes(o,i,o.length-i),r.writeByte(0),r.writeString(";")};var a=function(r){var t=r,e=0,n=0,o={};return o.write=function(r,o){if(r>>>o!=0)throw new Error("length over");for(;e+o>=8;)t.writeByte(255&(r<<e|n)),o-=8-e,r>>>=8-e,n=0,e=0;n=r<<e|n,e+=o},o.flush=function(){e>0&&t.writeByte(n)},o},u=function(r){for(var t=1<<r,e=(1<<r)+1,n=r+1,i=f(),u=0;t>u;u+=1)i.add(String.fromCharCode(u));i.add(String.fromCharCode(t)),i.add(String.fromCharCode(e));var c=l(),g=a(c);g.write(t,n);var s=0,h=String.fromCharCode(o[s]);for(s+=1;s<o.length;){var v=String.fromCharCode(o[s]);s+=1,i.contains(h+v)?h+=v:(g.write(i.indexOf(h),n),i.size()<4095&&(i.size()==1<<n&&(n+=1),i.add(h+v)),h=v)}return g.write(i.indexOf(h),n),g.write(e,n),g.flush(),c.toByteArray()},f=function(){var r={},t=0,e={};return e.add=function(n){if(e.contains(n))throw new Error("dup key:"+n);r[n]=t,t+=1},e.size=function(){return t},e.indexOf=function(t){return r[t]},e.contains=function(t){return"undefined"!=typeof r[t]},e};return i},v=function(r,t,e,n){for(var o=h(r,t),i=0;t>i;i+=1)for(var a=0;r>a;a+=1)o.setPixel(a,i,e(a,i));var u=l();o.write(u);for(var f=g(),c=u.toByteArray(),s=0;s<c.length;s+=1)f.writeByte(c[s]);f.flush();var v="";return v+="<img",v+=' src="',v+="data:image/gif;base64,",v+=f,v+='"',v+=' width="',v+=r,v+='"',v+=' height="',v+=t,v+='"',n&&(v+=' alt="',v+=n,v+='"'),v+="/>"};return t}();return function(r){"function"==typeof define&&define.amd?define([],r):"object"==typeof exports&&(module.exports=r())}(function(){return r}),!function(r){r.stringToBytes=function(r){function t(r){for(var t=[],e=0;e<r.length;e++){var n=r.charCodeAt(e);128>n?t.push(n):2048>n?t.push(192|n>>6,128|63&n):55296>n||n>=57344?t.push(224|n>>12,128|n>>6&63,128|63&n):(e++,n=65536+((1023&n)<<10|1023&r.charCodeAt(e)),t.push(240|n>>18,128|n>>12&63,128|n>>6&63,128|63&n))}return t}return t(r)}}(r),r}());

生成二维码的代码有点多 不过没关系直接复制下来 就可以用了　　

下面是支付回执

@RequestMapping("weixin_notify")
    public void weixin_notify(HttpServletRequest request,HttpServletResponse response) throws Exception{
        //读取参数
        InputStream inputStream ;
        StringBuffer sb = new StringBuffer();
        inputStream = request.getInputStream();
        String s ;
        BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
        while ((s = in.readLine()) != null){
            sb.append(s);
        }
        in.close();
        inputStream.close();  
 
        //解析xml成map
        Map<String, String> m = new HashMap<String, String>();
        m = XMLUtil.doXMLParse(sb.toString());  
 
        //过滤空 设置 TreeMap
        SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>();
        Iterator it = m.keySet().iterator();
        while (it.hasNext()) {
            String parameter = (String) it.next();
            String parameterValue = m.get(parameter);  
 
            String v = "";
            if(null != parameterValue) {
                v = parameterValue.trim();
            }
            packageParams.put(parameter, v);
        }  
 
        // 账号信息
        String key = Constants.WEIXIN_PAY_KEY; // key  
 
        logger.info(packageParams);
        //判断签名是否正确
        if(PayCommonUtil.isTenpaySign("UTF-8", packageParams,key)) {
            //------------------------------
            //处理业务开始
            //------------------------------
            String resXml = "";
            if("SUCCESS".equals((String)packageParams.get("result_code"))){
                // 这里是支付成功
                //////////执行自己的业务逻辑////////////////  
 
                //获取订单号
                String out_trade_no = (String)packageParams.get("out_trade_no");
                //调用根据订单号更改订单状态的方法
//////////执行自己的业务逻辑////////////////  
 
                logger.info("支付成功");
                //通知微信.异步确认成功.必写.不然会一直通知后台.八次之后就认为交易失败了.
                resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
                        + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";  
 
            } else {
                logger.info("支付失败,错误信息：" + packageParams.get("err_code"));
                resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
                        + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";
            }
            //------------------------------
            //处理业务完毕
            //------------------------------
            BufferedOutputStream out = new BufferedOutputStream(  response.getOutputStream());
            out.write(resXml.getBytes());
            out.flush();
            out.close();
        } else{
            logger.info("通知签名验证失败");
        }  
 
    }  

下面是需要的工具类HttpUtil类用来请求接口的 如果有别的也可以代替

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
 
//这个工具类是 根据url
public class HttpUtil {  
 
    private final static int CONNECT_TIMEOUT = 5000; // in milliseconds
    private final static String DEFAULT_ENCODING = "UTF-8";  
 
    public static String postData(String urlStr, String data){
        return postData(urlStr, data, null);
    }  
 
    /****
     * 功能描述 根据url    请求接口  返回String数据
     * @param urlStr    接口地址
     * @param data
     * @param contentType
     * @return
     */
    public static String postData(String urlStr, String data, String contentType){
        BufferedReader reader = null;
        try {
            URL url = new URL(urlStr);
            URLConnection conn = url.openConnection();
            conn.setDoOutput(true);
            conn.setConnectTimeout(CONNECT_TIMEOUT);
            conn.setReadTimeout(CONNECT_TIMEOUT);
            if(contentType != null)
                conn.setRequestProperty("content-type", contentType);
            OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), DEFAULT_ENCODING);
            if(data == null)
                data = "";
            writer.write(data);
            writer.flush();
            writer.close();    
 
            reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), DEFAULT_ENCODING));
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line);
                sb.append("\r\n");
            }
            return sb.toString();
        } catch (IOException e) {
            e.getMessage();
 
        } finally {
            try {
                if (reader != null)
                    reader.close();
            } catch (IOException e) {
            }
        }
        return null;
    }
}  

下面是 PayCommonUtil工具类型 用来生成

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
 
import com.ruanyun.common.utils.MD5;
import com.ruanyun.common.utils.MD5Util;
 
public class PayCommonUtil {  
 
    /**
     * 是否签名正确,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 static boolean isTenpaySign(String characterEncoding, SortedMap<Object, Object> packageParams, String API_KEY) {
        StringBuffer sb = new StringBuffer();
        Set es = packageParams.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=" + API_KEY);  
 
        //算出摘要
        String mysign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toLowerCase();
        String tenpaySign = ((String)packageParams.get("sign")).toLowerCase();  
 
        //System.out.println(tenpaySign + "    " + mysign);
        return tenpaySign.equals(mysign);
    }  
 
    /**
     * @author
     * @date 2016-4-22
     * @Description：sign签名
     * @param characterEncoding
     *            编码格式
     * @param parameters
     *            请求参数
     * @return
     */
    public static String createSign(String characterEncoding, SortedMap<Object, Object> packageParams, String API_KEY) {
        StringBuffer sb = new StringBuffer();
        Set es = packageParams.entrySet();  //所有参与传参的参数按照accsii排序（升序）
        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=" + API_KEY);
        System.out.println("StringQ:参数排列顺序"+sb.toString());
        String sign = MD5.MD5Encode(sb.toString(),characterEncoding).toUpperCase();  //sign必须是大写
        return sign;
    }  
 
    /**
     * @author
     * @date 2016-4-22
     * @Description：将请求参数转换为xml格式的string
     * @param parameters
     *            请求参数
     * @return
     */
    public static String getRequestXml(SortedMap<Object, Object> parameters) {
        StringBuffer sb = new StringBuffer();
        sb.append("<xml>");
        Set es = 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 ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {
                sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
            } else {
                sb.append("<" + k + ">" + v + "</" + k + ">");
            }
        }
        sb.append("</xml>");
        return sb.toString();
    }  
 
    /**
     * 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;
    }  
 
}

下面是XMLUtil类

import java.io.ByteArrayInputStream;
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 org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
 
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();
    }  
 
}  

最后是md5 工具类

import java.security.MessageDigest;
 
public class MD5 {
 
    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" };  
 
}
 
转载自http://www.cnblogs.com/jishuzhaichen/p/6377741.html。