微信公众平台--网页授权获取用户基本信息（snsapi_base方式）

关于snsapi_base网页授权的说明

以snsapi_base为scope发起的网页授权，是用来获取进入页面的用户的openid的，并且是静默授权并自动跳转到回调页的。用户感知的就是直接进入了回调页（往往是业务页面）

微信打开链接（https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx48414ee14f7d7158
&redirect_uri=http://test.cn/testWx//servlet/Oauth2Servlet&response_type=code&scope=snsapi_base&state=1&connect_redirect=1#wechat_redirect）
即可看到效果，效果截图如下:
只打印了 openid。

微信公众平台--网页授权获取用户基本信息（snsapi_base方式）-LMLPHP

具体代码如下：（代码参考博客：http://www.cnblogs.com/zyw-205520/p/3581088.html）

Oauth2Servlet.java

package com.payroll.wx.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONObject;

import com.payroll.wx.util.CommendDef;

import com.payroll.wx.util.HttpsGetUtil;

public class CopyOfOauth2Servlet extends HttpServlet {

    /**

     *

     */

    private static final long serialVersionUID = 1L;

    /**

     * The doGet method of the servlet. <br>

     *

     * This method is called when a form has its tag value method equals to get.

     *

     * @param request

     *            the request send by the client to the server

     * @param response

     *            the response send by the server to the client

     * @throws ServletException

     *             if an error occurred

     * @throws IOException

     *             if an error occurred

     */

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        //静默授权

        String get_access_token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?"

                + "appid="

                + CommendDef.AppId

                + "&secret="

                + CommendDef.AppSecret

                + "&code=CODE&grant_type=authorization_code";

        // 将请求、响应的编码均设置为UTF-8（防止中文乱码）

        request.setCharacterEncoding("UTF-8");

        response.setCharacterEncoding("UTF-8");

        String code = request.getParameter("code");

        System.out.println("******************code=" + code);

        get_access_token_url = get_access_token_url.replace("CODE", code);

        String json = HttpsGetUtil.doHttpsGetJson(get_access_token_url);

        JSONObject jsonObject = JSONObject.fromObject(json);

        String openid = jsonObject.getString("openid");

        response.setContentType("text/html; charset=utf-8");

        PrintWriter out = response.getWriter();

        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");

        out.println("<HTML>");

        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");

        out.println("  <BODY>");

        out.print("    This is ");

        out.print(this.getClass());

        out.println(", using the POST method \n");

        out.println("openid:" + openid + "\n\n");

        out.println(">");

        out.println("  </BODY>");

        out.println("</HTML>");

        out.flush();

        out.close();

    }

}

HttpsGetUtil.java

package com.payroll.wx.util;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

public class HttpsGetUtil

{

    public static String doHttpsGetJson(String Url)

    {

        String message = "";

        try

        {

            System.out.println("doHttpsGetJson");//TODO:dd

            URL urlGet = new URL(Url);

            HttpURLConnection http = (HttpURLConnection) urlGet.openConnection();

            http.setRequestMethod("GET");      //必须是get方式请求    24

            http.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

            http.setDoOutput(true);

            http.setDoInput(true);

            System.setProperty("sun.net.client.defaultConnectTimeout", "30000");//连接超时30秒28

            System.setProperty("sun.net.client.defaultReadTimeout", "30000"); //读取超时30秒29 30

            http.connect();

            InputStream is =http.getInputStream();

            int size =is.available();

            byte[] jsonBytes =new byte[size];

            is.read(jsonBytes);

            message=new String(jsonBytes,"UTF-8");

        }

        catch (MalformedURLException e)

        {

              e.printStackTrace();

          }

        catch (IOException e)

          {

              e.printStackTrace();

          }

        return message;

    }

}