java实现微信支付功能

微信支付的具体实现方法，供大家参考，具体内容如下

工具类(用于在微信支付服务后台生成预支付交易单)

package com.fengdi.lianmeng.zhifu.weixin;

import com.fengdi.lianmeng.util.MD5;

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

/**
 *
 * 类说明：除被扫支付场景以外，店铺系统先调用该接口在微信支付服务后台生成预支付交易单，
 * 返回正确的预支付交易回话标识后再按扫码、JSAPI、APP等不同场景生成交易串调起支付。
 * @author 聂枫
 * 2016年1月8日上午11:33:21
 */
public class UnifiedorderReq{

 /**
 * 公众账号ID
 */
 private String appid;
 /**
 * 店铺号
 */
 private String mch_id;
 /**
 * 设备号
 */
 private String device_info;
 /**
 * 随机字符串
 */
 private String nonce_str;
 /**
 * 签名
 */
 private String sign;
 /**
 * 商品描述
 */
 private String body;
 /**
 * 商品详情
 */
 private String detail;
 /**
 * 附加数据
 */
 private String attach;
 /**
 * 店铺订单号
 */
 private String out_trade_no;
 /**
 * 货币类型
 */
 private String fee_type;
 /**
 * 总金额
 */
 private Integer total_fee;
 /**
 * 终端IP
 */
 private String spbill_create_ip;
 /**
 * 交易起始时间
 */
 private String time_start;
 /**
 * 交易结束时间
 */
 private String time_expire;
 /**
 * 商品标记
 */
 private String goods_tag;
 /**
 * 通知地址
 */
 private String notify_url;
 /**
 * 交易类型
 */
 private String trade_type;
 /**
 * 商品ID
 */
 private String product_id;
 /**
 * 指定支付方式
 */
 private String limit_pay;
 /**
 * 用户标识
 */
 private String openid;
 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 getDevice_info() {
 return device_info;
 }
 public void setDevice_info(String device_info) {
 this.device_info = device_info;
 }
 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.length()>40?body.substring(0,40):body;
 }
 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 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 getFee_type() {
 return fee_type;
 }
 public void setFee_type(String fee_type) {
 this.fee_type = fee_type;
 }
 public Integer getTotal_fee() {
 return total_fee;
 }
 public void setTotal_fee(Integer total_fee) {
 this.total_fee = total_fee;
 }
 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 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 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 getProduct_id() {
 return product_id;
 }
 public void setProduct_id(String product_id) {
 this.product_id = product_id;
 }
 public String getLimit_pay() {
 return limit_pay;
 }
 public void setLimit_pay(String limit_pay) {
 this.limit_pay = limit_pay;
 }
 public String getOpenid() {
 return openid;
 }
 public void setOpenid(String openid) {
 this.openid = openid;
 }
 @Override
 public String toString() {
 StringBuilder builder = new StringBuilder();
 builder.append("UnifiedorderReq [appid=");
 builder.append(appid);
 builder.append(",mch_id=");
 builder.append(mch_id);
 builder.append(",device_info=");
 builder.append(device_info);
 builder.append(",nonce_str=");
 builder.append(nonce_str);
 builder.append(",sign=");
 builder.append(sign);
 builder.append(",body=");
 builder.append(body);
 builder.append(",detail=");
 builder.append(detail);
 builder.append(",attach=");
 builder.append(attach);
 builder.append(",out_trade_no=");
 builder.append(out_trade_no);
 builder.append(",fee_type=");
 builder.append(fee_type);
 builder.append(",total_fee=");
 builder.append(total_fee);
 builder.append(",spbill_create_ip=");
 builder.append(spbill_create_ip);
 builder.append(",time_start=");
 builder.append(time_start);
 builder.append(",time_expire=");
 builder.append(time_expire);
 builder.append(",goods_tag=");
 builder.append(goods_tag);
 builder.append(",notify_url=");
 builder.append(notify_url);
 builder.append(",trade_type=");
 builder.append(trade_type);
 builder.append(",product_id=");
 builder.append(product_id);
 builder.append(",limit_pay=");
 builder.append(limit_pay);
 builder.append(",openid=");
 builder.append(openid);
 builder.append("]");
 return builder.toString();
 }

 public String toSignString(){
 Class<?> clz = this.getClass();
 Field[] fields = clz.getDeclaredFields();
 StringBuilder builder = new StringBuilder();
 for (Field field : fields) {
  builder.append(field.getName());
 }
 return builder.toString();
 }

 public String signString(){
 StringBuilder builder = new StringBuilder();
 builder.append("appid="+appid);
 if(attach!=null){
  builder.append("&attach="+attach);
 }
 builder.append("&body="+body);
 builder.append("&mch_id="+mch_id);
 builder.append("&nonce_str="+nonce_str);
 builder.append("&notify_url="+notify_url);
 if(!trade_type.equals("APP")) {
  builder.append("&openid="+openid);
 }
 builder.append("&out_trade_no="+out_trade_no);
 builder.append("&spbill_create_ip="+spbill_create_ip);
 builder.append("&total_fee="+total_fee);
 builder.append("&trade_type="+trade_type);
 builder.append("&key="+FgWxConfig.mobilekey);
 return builder.toString();
 }

 public String wapSignString(){
 StringBuilder builder = new StringBuilder();
 builder.append("appid="+appid);
 if(attach!=null){
  builder.append("&attach="+attach);
 }
 builder.append("&body="+body);
 builder.append("&mch_id="+mch_id);
 builder.append("&nonce_str="+nonce_str);
 builder.append("&notify_url="+notify_url);
 if(!trade_type.equals("APP")) {
  builder.append("&openid="+openid);
 }
 builder.append("&out_trade_no="+out_trade_no);
 builder.append("&spbill_create_ip="+spbill_create_ip);
 builder.append("&total_fee="+total_fee);
 builder.append("&trade_type="+trade_type);
 builder.append("&key="+FgWxConfig.key);
 return builder.toString();
 }

 public String toXml(){
 return "<xml>" +
      "<appid>"+appid+"</appid>"+
      (attach != null? "<attach>"+attach+"</attach>" : "")+
         "<body>"+body+"</body>"+
         "<mch_id>"+mch_id+"</mch_id>"+
         "<nonce_str>"+nonce_str+"</nonce_str>"+
         "<notify_url>"+notify_url+"</notify_url>"+
         (trade_type.equals("APP") == true?"":"<openid>"+openid+"</openid>")+
         "<out_trade_no>"+out_trade_no+"</out_trade_no>"+
         "<spbill_create_ip>"+spbill_create_ip+"</spbill_create_ip>"+
         "<total_fee>"+total_fee+"</total_fee>"+
         "<trade_type>"+trade_type+"</trade_type>"+
         "<sign>"+MD5.encryptByMD5(signString()).toUpperCase()+"</sign>"+
         "</xml>";
 }

 public String toWapXml(){
 return "<xml>" +
      "<appid>"+appid+"</appid>"+
      (attach != null? "<attach>"+attach+"</attach>" : "")+
         "<body>"+body+"</body>"+
         "<mch_id>"+mch_id+"</mch_id>"+
         "<nonce_str>"+nonce_str+"</nonce_str>"+
         "<notify_url>"+notify_url+"</notify_url>"+
         (trade_type.equals("APP") == true?"":"<openid>"+openid+"</openid>")+
         "<out_trade_no>"+out_trade_no+"</out_trade_no>"+
         "<spbill_create_ip>"+spbill_create_ip+"</spbill_create_ip>"+
         "<total_fee>"+total_fee+"</total_fee>"+
         "<trade_type>"+trade_type+"</trade_type>"+
         "<sign>"+MD5.encryptByMD5(wapSignString()).toUpperCase()+"</sign>"+
         "</xml>";
 }

 /*支付查询签名字符串*/
 public String signQueryString(String transaction_id){
 StringBuilder builder = new StringBuilder();
 builder.append("appid="+appid);
 builder.append("&body="+body);
 builder.append("&mch_id="+mch_id);
 builder.append("&nonce_str="+nonce_str);
 builder.append("&transaction_id="+transaction_id);
 builder.append("&key="+FgWxConfig.mobilekey);
 return builder.toString();
 }

 /*支付查询*/
 public String toQueryXml(String transaction_id){
 StringBuilder sBuilder=new StringBuilder();
 sBuilder.append("<xml>");
 sBuilder.append("<appid>"+appid+"</appid>");
 sBuilder.append("<body>"+body+"</body>");
 sBuilder.append("<mch_id>"+mch_id+"</mch_id>");
 sBuilder.append("<nonce_str>"+nonce_str+"</nonce_str>");
 sBuilder.append("<transaction_id>"+transaction_id+"</transaction_id>");
 sBuilder.append("<sign>"+MD5.encryptByMD5(signQueryString(transaction_id)).toUpperCase()+"</sign>");
 sBuilder.append("</xml>");
 return sBuilder.toString();
 }

 public Map<String,Object> toMap(){
 Map<String,Object> params = new HashMap<String,Object>();
 params.put("appid",appid);
 if(attach!=null){
  params.put("attach",attach);
 }
 params.put("body",body);
 params.put("mch_id",mch_id);
 params.put("nonce_str",nonce_str);
 params.put("notify_url",notify_url);
 if(!trade_type.equals("APP")) {
  params.put("openid",openid);
 }
 params.put("out_trade_no",out_trade_no);
 params.put("spbill_create_ip",spbill_create_ip);
 params.put("total_fee",total_fee);
 params.put("trade_type",trade_type);
 params.put("sign",MD5.encryptByMD5(signString()).toUpperCase());
 return params;
 }

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