Java通过JsApi方式实现微信支付

要使用JsApi进行微信支付，首先要从微信获得一个prepay_id，然后通过调用微信的jsapi完成支付，JS API的返回结果get_brand_wcpay_request:ok仅在用户成功完成支付时返回。由于前端交互复杂，get_brand_wcpay_request:cancel或者get_brand_wcpay_request:fail可以统一处理为用户遇到错误或者主动放弃，不必细化区分。
示例代码如下：

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

下面讲的是获得参数来调用jsapi
我们调用JSAPI时，必须获得用户的openid，（trade_type=JSAPI，openid为必填参数。）
首先定义一个请求的对象：

package com.unstoppedable.protocol;



import com.unstoppedable.common.Configure;
import com.unstoppedable.common.HttpService;
import com.unstoppedable.common.RandomStringGenerator;
import com.unstoppedable.common.Signature;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;


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 void setAppid(String appid) {
 this.appid = appid;
 }

 public void setMch_id(String mch_id) {
 this.mch_id = mch_id;
 }

 public void setDevice_info(String device_info) {
 this.device_info = device_info;
 }

 public void setNonce_str(String nonce_str) {
 this.nonce_str = nonce_str;
 }

 public void setSign(String sign) {
 this.sign = sign;
 }

 public void setBody(String body) {
 this.body = body;
 }

 public void setDetail(String detail) {
 this.detail = detail;
 }

 public void setAttach(String attach) {
 this.attach = attach;
 }

 public void setOut_trade_no(String out_trade_no) {
 this.out_trade_no = out_trade_no;
 }

 public void setFee_type(String fee_type) {
 this.fee_type = fee_type;
 }

 public void setTotal_fee(int total_fee) {
 this.total_fee = total_fee;
 }

 public void setSpbill_create_ip(String spbill_create_ip) {
 this.spbill_create_ip = spbill_create_ip;
 }

 public void setTime_start(String time_start) {
 this.time_start = time_start;
 }

 public void setTime_expire(String time_expire) {
 this.time_expire = time_expire;
 }

 public void setGoods_tag(String goods_tag) {
 this.goods_tag = goods_tag;
 }

 public void setNotify_url(String notify_url) {
 this.notify_url = notify_url;
 }

 public void setTrade_type(String trade_type) {
 this.trade_type = trade_type;
 }

 public void setProduct_id(String product_id) {
 this.product_id = product_id;
 }

 public void setLimit_pay(String limit_pay) {
 this.limit_pay = limit_pay;
 }

 public void setOpenid(String openid) {
 this.openid = 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;

 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);
 }
 }



}

因为有些参数为必填，有些参数为选填。而且sign要等所有参数传入之后才能计算的出，所以这里用了builder模式。关于builder模式。

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