项目中需要使用到微信和支付宝的退款功能，在这两天研究了一下这两个平台的退款，有很多坑，在开发中需要留意
1、微信退款接口
相对来说我感觉微信的退款接口还是比较好调用的，直接发送httppost请求即可；
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/*** * @方法名称:payRefund* @内容摘要: ＜退款＞*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> transaction_id* 微信支付订单号*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> out_refund_no* 商户订单号*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> total_fee* 总金额*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> refund_fee* 退款金额*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> op_user_id* 操作人*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @return</span> String*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @exception</span>*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @author</span>:鹿伟伟* @创建日期:4月11日-上午11:07:04*/</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> String <span class="hljs-title" style="box-sizing: border-box;">wxPayRefundRequest</span>(String transaction_id, String out_refund_no,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> total_fee, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> refund_fee, String op_user_id) {CloseableHttpClient httpclient = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;CloseableHttpResponse response = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;String strResponse = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span> {httpclient = ClientCustomSSL.getCloseableHttpClient();<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 构造HTTP请求</span>HttpPost httpPost = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> HttpPost(Configure.PAY_REFUND_API);<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// PayRefundReqData wxdata = new PayRefundReqData(</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// "10047602263541023415", "16371", 30, 30, "19417");</span>PayRefundReqData wxdata = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> PayRefundReqData(transaction_id,out_refund_no, total_fee, refund_fee, op_user_id);String requestStr = Util.ConvertObj2Xml(wxdata);StringEntity se = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> StringEntity(requestStr.toString());httpPost.setEntity(se);<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 发送请求</span>response = httpclient.execute(httpPost);HttpEntity entity = response.getEntity();<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (entity != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>) {SAXReader saxReader = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> SAXReader();Document document = saxReader.read(entity.getContent());Element rootElt = document.getRootElement();<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 结果码</span>String returnCode = rootElt.elementText(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"return_code"</span>);String resultCode = rootElt.elementText(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"result_code"</span>);<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"SUCCESS"</span>.equals(returnCode)&&<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"SUCCESS"</span>.equals(resultCode)) {strResponse=returnCode;}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> {strResponse=rootElt.elementText(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"err_code_des"</span>);}}EntityUtils.consume(entity); } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (Exception e) {Logger.getLogger(getClass()).error(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"payRefundRequest"</span>, e);} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">finally</span> {<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span> {response.close();httpclient.close();} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (IOException e) {<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// TODO Auto-generated catch block</span>Logger.getLogger(getClass()).error(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"payRefundRequest关闭异常:"</span>, e);}}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> strResponse;}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li></ul>
报错的话请检查加密的sign是否正确，还有就是调用的接口地址是否正确，有问题找我。
2、支付宝退款接口
支付宝直接导入支付宝封装好的jar包直接调用即可，官网下载地址:https://doc./doc2/detail?treeId=54&articleId=103419&docType=1
在弄支付宝退款的时候有一个插曲:就是支付宝调用时是客户端直接调用的，当时没有通过后台，后台只做了一个回调地址的使用，本来想着按照微信的思路写一个支付出来的，没想到怎么也调试不通，直接通过网址可以访问，在方法里面不行，后来只好使用支付宝的jar了。
调用方法:
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/*** * @方法名称:alipayRefundRequest* @内容摘要: ＜支付宝退款请求＞*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> out_trade_no 订单支付时传入的商户订单号,不能和 trade_no同时为空。*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> trade_no 支付宝交易号，和商户订单号不能同时为空*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> refund_amount 需要退款的金额，该金额不能大于订单金额,单位为元，支持两位小数*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @return</span> * String*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @exception</span> *<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @author</span>:鹿伟伟* @创建日期:4月12日-下午4:53:30*/</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> String <span class="hljs-title" style="box-sizing: border-box;">alipayRefundRequest</span>(String out_trade_no,String trade_no,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">double</span> refund_amount){<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 发送请求</span>String strResponse = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span> {AlipayClient alipayClient = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> DefaultAlipayClient(AlipayConfig.alipayurl,AlipayConfig.appid,AlipayConfig.private_key,AlipayConfig.content_type,AlipayConfig.input_charset,AlipayConfig.ali_public_key);AlipayTradeRefundRequest request = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> AlipayTradeRefundRequest();AlipayRefundInfo alidata= <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> AlipayRefundInfo();alidata.setOut_trade_no(out_trade_no);alidata.setRefund_amount(refund_amount);alidata.setTrade_no(trade_no);request.setBizContent(JsonUtils.convertToString(alidata));AlipayTradeRefundResponse response = alipayClient.execute(request);strResponse=response.getCode();<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"10000"</span>.equals(response.getCode())) {strResponse=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"退款成功"</span>;}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> {strResponse=response.getSubMsg();}} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (Exception e) {Logger.getLogger(getClass()).error(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"alipayRefundRequest"</span>, e);}<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> strResponse;}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li></ul>
不管怎么滴吧，搞定了，还有一个疑问就是官网上文档里面也没有具体说返回的状态码code的含义，网上找了一遍也没有找到，哪位大神知道的话发我一份。小弟在此谢过了。
微信下单接口
支付宝错误码：
https://doc./doc2/detail.htm?spm=a219a.7629140.0.0.Z87Tfg&treeId=58&articleId=103599&docType=1
转载地址：/lu_wei_wei/article/details/51135387
