java调用微信v3版本支付接口

最近做了个小项目，需要调用微信支付接口，看了官方文档，整个流程介绍的并不太好，在这里自己总结一下，以便以后使用

1.调用微信接口授权

授权这里有两种方式，一种是snsapi_bases，另一种是snsapi_userinfo，这里官方文档介绍的比较清楚，可以参考官网

https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419316505&token=&lang=zh_CN

我这里使用的是第一种，这里有几个需要传的参数说明一下

appid 登录微信公众号-基本配置-开发者ID-APPID

redirect_uri 就是一个回调地址，当你调用完微信的这个链接后，他会自动调用你定义的这个地址，返回code参数

注意，redirect_uri 也需要在公众号里面配置，在接口权限-网页帐号里修改，如我的是：www.xmaixle.com

2.可以在页面中写一个调用授权的页面

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>








	
非用户认证鉴权

java中的方法

	/**
	 * 获取授权地址
	 * @return
	 */
	@RequestMapping(value = "/getOauth2Url",method = RequestMethod.GET)
    public void getOauth2Url(Model model, HttpServletResponse response) {
		  Json j = new Json();
	        try {
	        	String authorize_url = PayConfig.AUTHORIZE_URL;
	    		String appId = PayConfig.APPID;
	    		String redirect_uri = PayConfig.REDIRECT_URI;
	    		String url = authorize_url + "?appid=" + appId + "&redirect_uri=" + urlEncodeUTF8(redirect_uri) + "&response_type=code&scope=snsapi_base&state=STATE#wechat_redirect";
	    		System.out.println(url);
	            j.setSuccess(true);
	            j.setMsg("保存成功！");
	            j.setObj(url);
	            write(response, JSON.toJSONString(j));
	        } catch (Exception e) {
	            j.setMsg(e.getMessage());
	        }
    }
	
	/**
	 * 对回调地址进行encode
	 * @param source
	 * @return
	 */
	public static String urlEncodeUTF8(String source){
        String result = source;
        try {
                result = java.net.URLEncoder.encode(source,"utf-8");
        } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
        }
        return result;
	}
 
  
 
  
 
  
 
  
package com.crm.common;

public class PayConfig {
	public static String APPID = "wx91af774aae000dcb"; //APPID
	public static String MCHID = "1347742701";		   //商户编号
	public static String PAYKEY = "kong6a9829e4b49a0d2347b4162da6b7";		   //支付密钥
	public static String  APPSECRET  = "f8e1ff34070a94332b3b128232acb5abf "; //公众号-基本配置-APPSECRET密钥
	public static String REDIRECT_URI = "http://www.xmaixle.com/authorize.htm";  //回调地址
	public static String AUTHORIZE_URL = "https://open.weixin.qq.com/connect/oauth2/authorize"; //微信授权地址
	public static String ACCESS_TOKEN_URI = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code";
	public static String SCOPE = "snsapi_base";		   //snsapi_base和snsapi_userinfo
	public static String GRANT_TYPE = "grant_type"; //获取openid时用，不用改
}
 
  
3.成功后，回到你当时写的回调地址
 
  
/**
	 * 微信授权后的回调地址的方法
	 * @param code
	 * @param response
	 */
	@RequestMapping(value = "/authorize",method = RequestMethod.GET)
    public void authorize(String code, HttpServletResponse response, String openid) {
		code = "test";
		String access_token_uri = PayConfig.ACCESS_TOKEN_URI;
		String appid = PayConfig.APPID;
		String secret = PayConfig.APPSECRET;
		access_token_uri = access_token_uri.replace("APPID", appid).replace("SECRET", secret).replace("CODE", code);
		System.out.println(access_token_uri);
		if(openid != null){
			UniteOrder order = getUniteOrder(openid);
			String reqXML = PayImpl.generateXML(order, PayConfig.PAYKEY);
			String respXML = PayImpl.requestWechat(ORDER_URL, reqXML);
			System.out.println("respXML=" + respXML);
			UniteOrderResult result = (UniteOrderResult) PayImpl.turnObject(UniteOrderResult.class, respXML);
			getWechatPay(result);
		}
    }
 
  
 
  
 
  
源码可以去我的资源里下载
 
  
http://download.csdn.net/detail/b422761838/9544619