WX公衆號受權登陸的簡單應用

時間 2019-11-07

標籤公衆號受權登陸簡單應用简体版

原文原文鏈接

項目中咱們常常會遇到第三方登陸,那咱們今天就來看看WX公衆號受權登陸的過程是怎麼樣的,其實微信公衆平臺中的開發者文檔已經寫得很是清晰了,不過我今天仍是總結一下,方便之後須要時能夠直接拉過去用;java

微信公衆平臺: https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140842web

固然既然是公衆號,那你就須要一個測試號; 這個測試帳號哪裏來,就百度好了;apache

有測試號的能夠在這查看公衆號信息:json

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

好了,就來看代碼吧:微信

新建一個web項目:app

須要引入的jar包:微信公衆平臺

commons-beanutils-1.9.3.jar
commons-collections-3.2.2.jar
commons-lang-2.6.jar
commons-logging-1.2.jar
ezmorph-1.0.6.jar
fluent-hc-4.5.3.jar
httpclient-4.5.3.jar
httpcore-4.4.6.jar
json-lib-2.4-jdk15.jar

1, 新建配置文件:ide

package wx.config;

public class WxConfig {

    public static final String APPID = "wxb6ad5296120ddc1e";
    
    public static final String APPSECRET = "4a69dcc6af046e00b1d9ec523afe5f48";
    
    /**
     * 回調地址
     */
    private static final String REDIRECT_URI = "http://gy.tunnel.qydev.com/myWebTest/wxCallback";
    
    /**
     * 獲取微信受權地址
     * */
    public static String getWXLoginUrl(){
        //微信受權地址,必須在微信中拿到
        String url = "https://open.weixin.qq.com/connect/oauth2/authorize?"
                + "appid="+APPID
                + "&redirect_uri="+REDIRECT_URI
                + "&response_type=code"
                + "&scope=snsapi_userinfo"
                + "&state=STATE#wechat_redirect";
        //開發者文檔上說要用 urlEncode對回調地址進行處理,但我處理後,就報域名不一致的錯誤,不處理反而訪問成功,因此這兒是個坑,應該多注意;
        return url;
    }
    
    public static void main(String[] args) {
        System.out.println(getWXLoginUrl());
    }
    
}

2, HTTP請求工具:工具

package common;

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.http.client.fluent.Request;
import org.apache.http.client.fluent.Response;

import net.sf.json.JSONObject;

/**
 * <p>類說明:微信請求工具
 * <p>建立人:geYang
 * <p>建立時間:2017.08.29
 * */
public class HttpUtil {
    /**
     * <p>方法說明: HTTP GET 請求
     * <p>編碼格式: UTF8
     * <p>參數說明: String urL 請求的路徑
     * <p>返回說明: JSONObject
     * */
    public static JSONObject doGet(String url) throws Exception{
        Request request = Request.Get(url);
        request.setHeader("Content-type", "application/json;charset=UTF8");
        Response response = request.execute();
        String jsonData = response.returnContent().asString();
        String string = new String(jsonData.getBytes("ISO-8859-1"),"UTF-8");
        JSONObject json = JSONObject.fromObject(string);
        return json;
    }
    
   
    
     /**
     *<p>方法說明: 獲取請求參數
     *<p>返回說明: Map<String,String> receiveMap
     *<p>建立時間: 2017年11月3日 下午2:25:02
     *<p>創  建  人: geYang
     * @throws UnsupportedEncodingException 
     **/
    public static Map<String,String> getReceiveMap(HttpServletRequest request) throws UnsupportedEncodingException{
        Map<String,String> receiveMap = new HashMap<String,String>();
        Map<String, String[]> requestParams = request.getParameterMap();
        for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext();) {
            String name = iter.next();
            String[] values = requestParams.get(name);
            String valueStr = "";
            for (int i = 0; i < values.length; i++) {
                valueStr = (i == values.length - 1) ? valueStr + values[i]
                            : valueStr + values[i] + ",";
            }
            //亂碼解決，這段代碼在出現亂碼時使用
//            valueStr = new String(valueStr.getBytes("ISO-8859-1"), "UTF-8");
            receiveMap.put(name, valueStr);
        }
        return receiveMap;
    }
    
}

3,建立回調接口: 這裏的接口與上面配置文件中的回調地址必須保持一致;

package wx.servlet;

import java.io.IOException;
import java.util.Map;

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 common.HttpUtil;
import net.sf.json.JSONObject;
import wx.config.WxConfig;

/**
 * 微信登陸回調
 */
@WebServlet("/wxCallback")
public class CallbackServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		System.out.println("微信回調到了");
		String code = request.getParameter("code");
		Map<String, String> receiveMap = HttpUtil.getReceiveMap(request);
		System.out.println(receiveMap);
		//經過 code 換取受權 access_token
		//URL:  https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code
		String url = "https://api.weixin.qq.com/sns/oauth2/access_token?"
		        + "appid="+WxConfig.APPID
		        + "&secret="+WxConfig.APPSECRET
		        + "&code="+code
		        + "&grant_type=authorization_code";
		try {
            JSONObject json = HttpUtil.doGet(url);
            Object openid = json.get("openid");
            Object access_token = json.get("access_token");
            
            if(openid!=null){
                System.out.printf("openid: %s;\naccess_token: %s;\n",openid,access_token);
            }
            //經過access_token拉取用戶信息
            //URL: https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN
            String userInforUrl = "https://api.weixin.qq.com/sns/userinfo?"
                    + "access_token="+access_token
                    + "&openid="+openid
                    + "&lang=zh_CN";
            JSONObject jsonUser = HttpUtil.doGet(userInforUrl);
            Object nickname = jsonUser.get("nickname");
            Object sex = jsonUser.get("sex");
            Object headimgurl = jsonUser.get("headimgurl");
            if(nickname!=null){
                System.out.printf("暱稱 : %s; 性別: %s; 圖像: %s\n",nickname,sex,headimgurl);
            }
            response.setContentType("application/json;charset=utf-8");
//            response.setCharacterEncoding("UTF-8");
            response.getWriter().append("暱稱: "+nickname+"<br/>").append("性別: "+sex+"<br/>").append("圖像:<img src='"+headimgurl+"'/>");
        } catch (Exception e) {
            e.printStackTrace();
        }
	}

}

好了,只要拿到用戶的openid,那麼咱們就能夠根據本身的須要來看是否獲取用戶信息,若是咱們有本身的帳號體系,徹底能夠不須要其餘信息,只同過openid的綁定就能夠了.

注意:

1, 回調地址必須是外網能夠訪問的域名,不能爲ip,咱們能夠利用 ngrok 或者花生殼來映射域名;

2, 公衆號管理中的網頁受權必須與咱們回調地址的域名一致,不然會報域名不一致的錯誤;