Java implements WeChat payment in JsApi mode

java implements WeChat payment in JsApi method

To use JsApi for WeChat payment, you must first obtain a PRepay_id from WeChat, and then complete the payment by calling WeChat's jsapi. The return result of JS API get_brand_wcpay_request:ok is only available in Returned when the user successfully completes the payment. Due to the complexity of front-end interaction, get_brand_wcpay_request:cancel or get_brand_wcpay_request:fail can be uniformly processed as the user encounters an error or gives up voluntarily, without detailed distinction. The sample code is as follows:

function onBridgeReady(){   WeixinJSBridge.invoke(       'getBrandWCPayRequest', {           "appId" : "wx2421b1c4370ec43b",     //公众号名称，由商户传入          
      "timeStamp":" 1395712654",         //时间戳，自1970年以来的秒数                "nonceStr" : "e61463f8efa94090b1f366cccfbbb444", 
      //随机串 "package" : "u802345jgfjsdfgsdg888",                "signType" : "md5",         
      //微信签名方式:                "paySign" : "70EA570631E4BB79628FBCA90534C63FF7FADD89" //微信签名        },       
      function(res){                if(res.err_msg == "get_brand_wcpay_request:ok" ) {}     
      // 使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回    ok，但并不保证它绝对可靠。        
      }   ); }if (typeof WeixinJSBridge == "undefined"){   if( document.addEventListener ){       
      document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);   }else if (document.attachEvent){       
      document.attachEvent('WeixinJSBridgeReady', onBridgeReady);        document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);   
      }}else{   onBridgeReady();}
以上传入的参数package，即为prepay_id详细文档见：https://pay.weixin.QQ.com/wiki/doc/api/jsapi.php?chapter=7_7

The following is about obtaining parameters to call jsapi. When we call JSAPI, we must obtain the user's openid, (trade_type=JSAPI, openid is a required parameter.) First define a request object:

package com.unstoppedable.protocol;import com.thoughtworks.xstream.annotations.XStreamAlias;import com.unstoppedable.common.Configure;import com.
unstoppedable.common.RandomStringGenerator;import com.unstoppedable.common.Signature;import java.lang.reflect.Field;import java.util.HashMap;
import java.util.Map;@XStreamAlias("xml")
public class UnifiedOrderReqData 
{    
private String appid;    
private String mch_id;    
private String device_info;    
private String nonce_str;    
private String sign;    
private String body;    
private String detail;    
private String attach;    
private String out_trade_no;   
private String fee_type;    
private int total_fee;    
private String spbill_create_ip;    
private String time_start;    
private String time_expire;    
private String goods_tag;    
private String notify_url;    
private String trade_type;    
private String product_id;    
private String limit_pay;    
private String openid;    
private UnifiedOrderReqData(UnifiedOrderReqDataBuilder builder) 
{        
this.appid = builder.appid;        
this.mch_id = builder.mch_id;        
this.device_info = builder.device_info;        
this.nonce_str = RandomStringGenerator.getRandomStringByLength(32);        
this.body = builder.body;        
this.detail = builder.detail;        
this.attach = builder.attach;        
this.out_trade_no = builder.out_trade_no;        
this.fee_type = builder.fee_type;        
this.total_fee = builder.total_fee;        
this.spbill_create_ip = builder.spbill_create_ip;        
this.time_start = builder.time_start;        
this.time_expire = builder.time_expire;        
this.goods_tag = builder.goods_tag;        
this.notify_url = builder.notify_url;        
this.trade_type = builder.trade_type;        
this.product_id = builder.product_id;        
this.limit_pay = builder.limit_pay;        
this.openid = builder.openid;        
this.sign = Signature.getSign(toMap());    
}    
public String getAppid() 
{        
return appid;    
}    
public String getMch_id() 
{        
return mch_id;    
}    
public String getDevice_info() 
{        return device_info;    
}    
public String getNonce_str() 
{        
return nonce_str;    
}    
public String getSign() 
{        
return sign;    
}    
public String getBody() 
{       
 return body;   
 }    
 public String getDetail() 
 {       
  return detail;    
  }    
  public String getAttach() 
  {        
  return attach;    
  }    
  public String getOut_trade_no() 
  {        
  return out_trade_no;    
  }    
  public String getFee_type() 
  {        
  return fee_type;    
  }    
  public int getTotal_fee() 
  {       
   return total_fee;    
   }    
   public String getSpbill_create_ip() 
   {        
   return spbill_create_ip;    
   }    
   public String getTime_start() 
   {        
   return time_start;    
   }    
   public String getTime_expire() 
   {        
   return time_expire;    
   }    
   public String getGoods_tag() 
   {        
   return goods_tag;    
   }    
   public String getNotify_url() 
   {        return notify_url;    
   }   
    public String getTrade_type() 
    {        return trade_type;    
    }    
    public String getProduct_id() 
    {        return product_id;    
    }    
    public String getLimit_pay() 
    {        return limit_pay;    
    }    
    public String getOpenid() 
    {        
    return openid;    
    }    
    public Map<String, Object> toMap() 
    {       
     Map<String, Object> map = new HashMap<String, Object>();        
     Field[] fields = this.getClass().getDeclaredFields();        
     for (Field field : fields) 
     {            
     Object obj;            
     try {                
     obj = field.get(this);                
     if (obj != null) {                   
      map.put(field.getName(), obj);               
      }            
      } 
      catch (IllegalArgumentException e) 
      {                
      e.printStackTrace();            
      } 
      catch (IllegalaccessException e) 
      {                
      e.printStackTrace();            
      }        
      }        
      return map;    
      }    
      public static class UnifiedOrderReqDataBuilder 
      {        
      private String appid;        
      private String mch_id;        
      private String device_info;        
      private String body;        
      private String detail;        
      private String attach;       
      private String out_trade_no;        
      private String fee_type;        
      private int total_fee;        
      private String spbill_create_ip;        
      private String time_start;        
      private String time_expire;        
      private String goods_tag;        
      private String notify_url;       
      private String trade_type;        
      private String product_id;        
      private String limit_pay;        
      private String openid;        
      /**         
      * 使用配置中的 appid 和  mch_id         
      *         
      * @param body         
      * @param out_trade_no         
      * @param total_fee         
      * @param spbill_create_ip         
      * @param notify_url         
      * @param trade_type         
      */        
      public UnifiedOrderReqDataBuilder(String body, String out_trade_no, Integer total_fee,                                          
      String spbill_create_ip, String notify_url, String trade_type) 
      {            
      this(Configure.getAppid(), 
      Configure.getMchid(), 
      body, 
      out_trade_no, 
      total_fee,                    
      spbill_create_ip, notify_url, trade_type);        
      }        
      public UnifiedOrderReqDataBuilder(String appid, String mch_id, String body, String out_trade_no, Integer total_fee,                                          
      String spbill_create_ip, String notify_url, String trade_type) 
      {            
      if (appid == null) 
      {                
      throw new IllegalArgumentException("传入参数appid不能为null");            
      }            
      if (mch_id == null) {                
      throw new IllegalArgumentException("传入参数mch_id不能为null");            
      }            
      if (body == null) {                
      throw new IllegalArgumentException("传入参数body不能为null");            
      }            
      if (out_trade_no == null) {                
      throw new IllegalArgumentException("传入参数out_trade_no不能为null");            
      }            
      if (total_fee == null) {                
      throw new IllegalArgumentException("传入参数total_fee不能为null");            
      }            
      if (spbill_create_ip == null) {                
      throw new IllegalArgumentException("传入参数spbill_create_ip不能为null");            
      }            
      if (notify_url == null) {                
      throw new IllegalArgumentException("传入参数notify_url不能为null");            
      }            
      if (trade_type == null) {                
      throw new IllegalArgumentException("传入参数trade_type不能为null");            
      }            
      this.appid = appid;            
      this.mch_id = mch_id;            
      this.body = body;            
      this.out_trade_no = out_trade_no;            
      this.total_fee = total_fee;            
      this.spbill_create_ip = spbill_create_ip;            
      this.notify_url = notify_url;            
      this.trade_type = trade_type;        
      }        
      public UnifiedOrderReqDataBuilder setDevice_info(String device_info) 
      {            
      this.device_info = device_info;            
      return this;        
      }        
      public UnifiedOrderReqDataBuilder setDetail(String detail) 
      {            
      this.detail = detail;            
      return this;        
      }        
      public UnifiedOrderReqDataBuilder setAttach(String attach) 
      {            
      this.attach = attach;            
      return this;        
      }        
      public UnifiedOrderReqDataBuilder setFee_type(String fee_type) 
      {            
      this.fee_type = fee_type;            
      return this;        
      }        
      public UnifiedOrderReqDataBuilder setTime_start(String time_start) 
      {            
      this.time_start = time_start;            
      return this;        
      }        
      public UnifiedOrderReqDataBuilder setTime_expire(String time_expire) 
      {            
      this.time_expire = time_expire;            
      return this;        
      }        
      public UnifiedOrderReqDataBuilder setGoods_tag(String goods_tag) 
      {            
      this.goods_tag = goods_tag;            
      return this;        
      }        
      public UnifiedOrderReqDataBuilder setProduct_id(String product_id) 
      {            
      this.product_id = product_id;            
      return this;        
      }        
      public UnifiedOrderReqDataBuilder setLimit_pay(String limit_pay) 
      {            
      this.limit_pay = limit_pay;            
      return this;        
      }        
      public UnifiedOrderReqDataBuilder setOpenid(String openid) 
      {            
      this.openid = openid;            
      return this;        
      }        
      public UnifiedOrderReqData build() 
      {            
      if ("JSAPI".equals(this.trade_type) && this.openid == null) 
      {                
      throw new IllegalArgumentException("当传入trade_type为JSAPI时，openid为必填参数");            
      }            
      if ("NATIVE".equals(this.trade_type) && this.product_id == null) 
      {                
      throw new IllegalArgumentException("当传入trade_type为NATIVE时，product_id为必填参数");            
      }            
      return new UnifiedOrderReqData(this);        
      }    
      }
      }

Because some parameters are required and some parameters are optional. Moreover, sign cannot be calculated until all parameters are passed in, so the builder mode is used here. About builder mode. For the definition of each parameter, refer to the documentation https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1

We choose httpclient Perform network transmission.

package com.
unstoppedable.
common;
import com.
thoughtworks.
xstream.
XStream;import com.
thoughtworks.
xstream.io.xml.
DomDriver;import com.
thoughtworks.xstream.io.xml.XmlFriendlyNameCoder;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.apache.
http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.ResponseHandler;
import org.apache.http.client.config.RequestConfig;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.
apache.http.conn.ConnectTimeoutException;import org.apache.http.conn.ConnectionPoolTimeoutException;import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContexts;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.
http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;import javax.net.ssl.SSLContext;import java.io.File;import java.io.FileInputStream;
import java.io.IOException;import java.net.SocketTimeoutException;import java.security.KeyStore;
/** 
* Created by hupeng on 2015/7/28. 
*/
public class HttpService 
{    
private static Log logger = LogFactory.getLog(HttpService.class);    
private static CloseableHttpClient httpClient = buildHttpClient();    //连接超时时间，默认10秒    
private static int socketTimeout = 5000;    //传输超时时间，默认30秒    
private static int connectTimeout = 5000;    
private static int requestTimeout = 5000;    
public static CloseableHttpClient buildHttpClient() 
{        
try {            
KeyStore keyStore = KeyStore.getInstance("PKCS12");            
FileInputStream instream = new FileInputStream(new File(Configure.getCertLocalPath()));//加载本地的证书进行https加密传输            
try {                
keyStore.load(instream, Configure.getCertPassWord().toCharArray());//设置证书密码            
} finally {                
instream.close();            
}            
// Trust own CA and all self-signed certs            
SSLContext sslcontext = SSLContexts.custom()                    
.loadKeyMaterial(keyStore, Configure.getCertPassword().toCharArray())                    
.build();            
// Allow TLSv1 protocol only            
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(                    
sslcontext,                    
new String[]{"TLSv1"},                    
null,                    
SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);            
RequestConfig requestConfig = RequestConfig.custom()                    
.setConnectTimeout(connectTimeout)                    
.setConnectionRequestTimeout(requestTimeout)                    
.setSocketTimeout(socketTimeout).build();           
 httpClient = HttpClients.custom()                    
 .setDefaultRequestConfig(requestConfig)                    
 .setSSLSocketFactory(sslsf)                    
 .build();            
 return httpClient;        
 } catch (Exception e) {            
 throw new RuntimeException("error create httpclient......", e);        
 }    
 }   
 public static String doGet(String requestUrl) throws Exception {        
 HttpGet httpget = new HttpGet(requestUrl);        
 try {            
 logger.debug("Executing request " + httpget.getRequestLine());           
  // Create a custom response handler            
  ResponseHandler<String> responseHandler = new ResponseHandler<String>() {                
  @Override                
  public String handleResponse(                        
  final HttpResponse response) throws ClientProtocolException, IOException 
  {
 int status = response.getStatusLine().getStatusCode();                    
 if (status >= 200 && status < 300) 
 {                        
 HttpEntity entity = response.getEntity();                        
 return entity != null ? EntityUtils.toString(entity) : null;                    
 } else {                        
 throw new ClientProtocolException("Unexpected response status: " + status);                    
 }                
 }            
 };            
 return httpClient.execute(httpget, responseHandler);        
 } finally {            
 httpget.releaseConnection();        
 }    
 }    
 public static String doPost(String url, Object object2Xml) {        
 String result = null;        
 HttpPost httpPost = new HttpPost(url);        
 //解决XStream对出现双下划线的bug        
 XStream xStreamForRequestPostData = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));        
 //将要提交给API的数据对象转换成XML格式数据Post给API        
 String postDataXML = xStreamForRequestPostData.toXML(object2Xml);        
 logger.info("API，POST过去的数据是：");        
 logger.info(postDataXML);        
 //得指明使用UTF-8编码，否则到API服务器XML的中文不能被成功识别        
 StringEntity postEntity = new StringEntity(postDataXML, "UTF-8");        
 httpPost.addHeader("Content-Type", "text/xml");        
 httpPost.setEntity(postEntity);        //设置请求器的配置        
 logger.info("executing request" + httpPost.getRequestLine());        
 try {            
 HttpResponse response = httpClient.execute(httpPost);            
 HttpEntity entity = response.getEntity();            
 result = EntityUtils.toString(entity, "UTF-8");        
 } catch (ConnectionPoolTimeoutException e) {            
 logger.error("http get throw ConnectionPoolTimeoutException(wait time out)", e);        
 } catch (ConnectTimeoutException e) {            
 logger.error("http get throw ConnectTimeoutException", e);        
 } catch (SocketTimeoutException e) {            
 logger.error("http get throw SocketTimeoutException", e);        
 } catch (Exception e) {            
 logger.error("http get throw Exception", e);        
 } finally {            
 httpPost.abort();        
 }        
 return result;    
 }}

Then there is our general entrance:

package com.unstoppedable.service;import com.unstoppedable.common.Configure;import com.unstoppedable.common.HttpService;import com.unstoppedable.common.
XMLParser;import com.unstoppedable.protocol.UnifiedOrderReqData;import org.xml.sax.SAXException;import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;import java.util.Map;
/** 
* Created by hupeng on 2015/7/28. 
*/
public class WxPayApi 
{    
public static Map<String,Object> UnifiedOrder(UnifiedOrderReqData reqData) throws IOException, SAXException, ParserConfigurationException {        
String res  = HttpService.doPost(Configure.UNIFIED_ORDER_API, reqData);        
return XMLParser.getMapFromXML(res);    
}    
public static void main(String[] args) throws Exception 
{        
UnifiedOrderReqData reqData = new UnifiedOrderReqData.UnifiedOrderReqDataBuilder
("appid", "mch_id", "body", "out_trade_no", 1, "spbill_create_ip", "notify_url", "JSAPI").setOpenid("openid").build();        
System.out.println(UnifiedOrder(reqData));    
}}

The returned xml is:

<xml>   
<return_code>
<![CDATA[SUCCESS]]>
</return_code>   
<return_msg>
<![CDATA[OK]]>
</return_msg>   
<appid>
<![CDATA[wx2421b1c4370ec43b]]>
</appid>   
<mch_id>
<![CDATA[10000100]]>
</mch_id>   
<nonce_str>
<![CDATA[IITRi8Iabbblz1Jc]]>
</nonce_str>   
<sign>
<![CDATA[7921E432F65EB8ED0CE9755F0E86D72F]]>
</sign>   
<result_code>
<![CDATA[SUCCESS]]>
</result_code>   
<prepay_id>
<![CDATA[wx201411101639507cbf6ffd8b0779950874]]>
</prepay_id>   
<trade_type>
<![CDATA[JSAPI]]>
</trade_type>
</xml>
return_code 和result_code都为SUCCESS的时候会返回我们需要的prepay_id。。。

Then just use it in jsapi. .

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