3-1_公众号授权登录1

首先准备一个已经认证的微信公众号

假如没有已经认证的，就可以使用 公众平台测试账号 进行开发

https://mp.weixin.qq.com/cgi-bin/frame?t=advanced/dev_tools_frame&nav=10049&token=1939537199&lang=zh_CN

然后看：

点击进入，查看此接口的开发说明文档。

https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140842

大概有4步

1 第一步：用户同意授权，获取code

2 第二步：通过code换取网页授权access_token

3 第三步：刷新access_token（如果需要）

4 第四步：拉取用户信息(需scope为 snsapi_userinfo)

5 附：检验授权凭证（access_token）是否有效

下面进行代码的开发：

新建一个项目：WxAuth

下面编写一个工具类：

根据地址进行网络请求的

需要的jar包

/WxAuth/src/com/wx/auth/util/AuthUtil.java

package com.wx.auth.util;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import net.sf.json.JSONObject;

public class AuthUtil {
	
	public static final String APPID = "wxa2021f7d0c2259f9";
	public static final String APPSECRET = "be070e2d7ee644aaa845f81f2cd847b2";
	
	public static JSONObject doGetJson(String url) throws ClientProtocolException, IOException{
		JSONObject jsonObject = null;
		DefaultHttpClient client = new DefaultHttpClient();
		HttpGet httpGet = new HttpGet(url);
		HttpResponse response = client.execute(httpGet);
		HttpEntity entity = response.getEntity();
		if(entity != null){
			String result = EntityUtils.toString(entity,"UTF-8");
			jsonObject = JSONObject.fromObject(result);
		}
		httpGet.releaseConnection();
		
		
		return jsonObject;
	}
}

下面组装一个接口地址：

1 第一步：用户同意授权，获取code

https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect

/WxAuth/src/com/wx/auth/util/LoginServlet.java

package com.wx.auth.servlet;

import java.io.IOException;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/wxLogin")
public class LoginServlet extends HttpServlet{
	
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		
		//回调地址，需公网能访问
		String backUrl = "http://huanglianggu.s1.natapp.cc/WxAuth/callBack";
		
		String url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid="+AuthUtil.APPID  
					+ "&redirect_uri="+URLEncoder.encode(backUrl)
					+ "&response_type=code" 
					+ "&scope=snsapi_userinfo" 
					+ "&state=STATE#wechat_redirect";
		resp.sendRedirect(url);
	}
}

第二步：通过code换取网页授权access_token

获取code后，请求以下链接获取access_token：  https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code

/WxAuth/src/com/wx/auth/servlet/CallBackServlet.java

package com.wx.auth.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONObject;

import com.wx.auth.util.AuthUtil;

@WebServlet("/callBack")
public class CallBackServlet extends HttpServlet{

	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		String code = req.getParameter("code");
		String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="+AuthUtil.APPID
				 + "&secret="+AuthUtil.APPSECRET
				 + "&code="+code
				 + "&grant_type=authorization_code";
		
		// 进行网络请求
		JSONObject jsonObject = AuthUtil.doGetJson(url);
		String openid = jsonObject.getString("openid");
		String token = jsonObject.getString("access_token");
		
		// 第四步：拉取用户信息(需scope为 snsapi_userinfo)
		//String infoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN";
		String infoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token="+token
				 		+"&openid="+openid
				 		+"&lang=zh_CN";
		// 进行网络请求
		JSONObject userInfo = AuthUtil.doGetJson(infoUrl);
		System.out.println("userInfo = "+userInfo);
		
		super.doGet(req, resp);
	}
}

再创建一个页面

/WxAuth/WebContent/index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width-device-width,initial-scale-1.8">
<title>Insert title here</title>
</head>
<body style="font-size:45px;text-align:center;">
	<a href="/WxAuth/wxLogin">微信公众授权登录</a>
</body>
</html>

启动项目

浏览器访问：

http://huanglianggu.s1.natapp.cc/WxAuth/index.jsp

如果浏览器点击则会提示

需要手机登录

手机上点击登录后，提示：

需要到 https://mp.weixin.qq.com/debug/cgi-bin/sandboxinfo?action=showinfo&t=sandbox/index

修改：

点击修改

手机点击登录，控制台是输出想要的结果了。

但是，回调页面报错：

直接跳转到 resp.sendRedirect("http://www.baidu.com");

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		String code = req.getParameter("code");
		String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="+AuthUtil.APPID
				 + "&secret="+AuthUtil.APPSECRET
				 + "&code="+code
				 + "&grant_type=authorization_code";
		
		// 进行网络请求
		JSONObject jsonObject = AuthUtil.doGetJson(url);
		String openid = jsonObject.getString("openid");
		String token = jsonObject.getString("access_token");
		
		// 第四步：拉取用户信息(需scope为 snsapi_userinfo)
		//String infoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN";
		String infoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token="+token
				 		+"&openid="+openid
				 		+"&lang=zh_CN";
		// 进行网络请求
		JSONObject userInfo = AuthUtil.doGetJson(infoUrl);
		System.out.println("userInfo = "+userInfo);
		
		resp.sendRedirect("http://www.baidu.com");
		//super.doGet(req, resp);
	}

3-1_公众号授权登录1

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