（一）微信公众号-接入与获取用户openId

微信测试号申请:
https://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=sandbox/login
微信公众号接口调试平台:
https://mp.weixin.qq.com/debug/
NATAPP内网穿透:
https://natapp.cn/

1、申请测试号、按指引操作即可。

使用内网穿透生成的域名。

2、接口配置

2.1工具类

package com.wx.project.util;

import java.security.MessageDigest;
import java.util.Arrays;

public class WxLinkUtil {

    public static boolean checkSignature(String signature,String timestamp,String nonce){
        String[] arr = new String[]{"test_weixin",timestamp,nonce};
        Arrays.sort(arr);
        StringBuffer content = new StringBuffer();
        for (int i = 0;i < arr.length;i++){
            content.append(arr[i]);
        }
        MessageDigest md = null;
        String temStr = null;
        try {
            md = MessageDigest.getInstance("SHA-1");
            byte[] digest = md.digest(content.toString().getBytes());
            temStr = byteToStr(digest);
        }catch (Exception e){
            e.printStackTrace();
        }
        content = null;
        return temStr != null ? temStr.equals(signature.toUpperCase()) : false;
    }
    /**
     * 将字节数组转换为十六进制字符串
     * @param byteArray
     * @return
     */
    private static String byteToStr(byte[] byteArray) {
        String strDigest = "";
        for (int i = 0; i < byteArray.length; i++) {
            strDigest += byteToHexStr(byteArray[i]);
        }
        return strDigest;
    }

    /**
     * 将字节转换为十六进制字符串
     * @param mByte
     * @return
     */
    private static String byteToHexStr(byte mByte) {
        char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        char[] tempArr = new char[2];
        tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
        tempArr[1] = Digit[mByte & 0X0F];
        String s = new String(tempArr);
        return s;
    }
}

2.2 接口

package com.wx.project.controller;

import com.wx.project.util.WxLinkUtil;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;

/**
 * 微信接入
 */
@Controller
@RequestMapping("/wx")
public class WXController {
    @RequestMapping(value = "/link",method = RequestMethod.GET)
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws Exception {
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        //签名
        String signature = request.getParameter("signature");
        //时间戳
        String timstamp = request.getParameter("timestamp");
        //随机数
        String nonce = request.getParameter("nonce");
        //随机字符串
        String echostr = request.getParameter("echostr");

        if(WxLinkUtil.checkSignature(signature,timstamp,nonce)){
            System.out.println("验证成功");
            PrintWriter out = response.getWriter();
            out.print(echostr);
            out.close();
        }else{
            System.out.println("验证失败");
        }

    }
    @RequestMapping(value = "/link",method = RequestMethod.POST)
    public void DoPost(){
          //不接管公众号的回复功能
    }

}

3、设置公众号菜单

3.1 获取accesstoken

3.2 设置菜单

自定义菜单json串

{
    "button": [
         
    {
        "name": "测试菜单", 
        "sub_button": [
        {
        "type": "view", 
        "name": "我是会员", 
        "url": "https://open.weixin.qq.com/connect/oauth2/authorize?appid=【你的APPId】&redirect_uri=http%3a%2f%2f【你的域名】%2f【你的工程名】%2f【如登录接口】?&response_type=code&scope=snsapi_base&state=123#wechat_redirect "
        }
        ]
        }
    ]
}

4、登录接口-获取openId

/**
 * 微信端点击进入的url.进行数据校验及跳转
 */
@Controller
@RequestMapping("/index")
public class IndexController {
    @Autowired
    private UserServiceImpl userService;
    @Autowired
    private MessageServiceImpl messageService;

    @RequestMapping("/login")
    public String login(HttpServletRequest request){

        HttpSession session = request.getSession();
        String code = request.getParameter("code");
        //通过code换取openId
        String responseStr = AccessTokenUtil.getOpenId(code);
        JSONObject jsonObject = JSONObject.fromObject(responseStr);
        //access_token
        String access_token = (String) jsonObject.get("access_token");
        //用户标识码
        String openId = (String) jsonObject.get("openid");
        System.out.println("openId :"+openId );

        if(access_token != null && openId !=null && access_token != "" && openId != ""){
            //获取微信用户的个人资料
            String responseStr2 = AccessTokenUtil.getUserInfo(openId);
            JSONObject jsonObject1 = JSONObject.fromObject(responseStr2);
            System.out.println(jsonObject1);
        }else{
            //跳转至错误页面
            return "redirect:/error.html";
        }
    }

5. 相关类

5.1 公众号相关工具类

package com.wx.project.util;

import com.wx.project.bean.AccessToken;
import com.wx.project.bean.WXPro;
import com.wx.project.service.impl.AccessTokenServiceImpl;
import net.sf.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.web.client.RestTemplate;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
 *  公众号接口工具类
 */
public class AccessTokenUtil {
    private static final String APPID = "wx82ba212c*******";
    private static final String APPSECRET = "4eb0472113314**************";
    private static ApplicationContext applicationContext = SpringUtils.getApplicationContext();
    private static RestTemplate restTemplate = applicationContext.getBean(RestTemplate.class);
    private static WXPro wxPro = applicationContext.getBean(WXPro.class);
    private static AccessTokenServiceImpl accessTokenService = applicationContext.getBean(AccessTokenServiceImpl.class);

    /**
     *  获取accessToken.
     *  accessToken过期时间为2小时，并且有获取次数限制，故存入数据库
     * @return
     */
    public static String getAccessToken()  {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String accessToken = "";
        try {
            AccessToken at = accessTokenService.getAccessToken();
            long currentTime = System.currentTimeMillis()/1000;//当前时间
            long getTime = sdf.parse(at.getUpdateTime()).getTime()/1000;
            long expiresIn = at.getExpired();
            if(currentTime - getTime > expiresIn){
                System.out.println("accessToken已过期，重新获取");
                //accessToken已过期，重新获取
                String url = wxPro.getTokenUrl().replace("APPID",APPID).replace("APPSECRET",APPSECRET);
                String responseStr = (String) HttpUtil.sendGet(restTemplate,url);
                JSONObject jsonObject = JSONObject.fromObject(responseStr);
                accessToken = (String) jsonObject.get("access_token");
                //获取到的accessToken存入数据库
                AccessToken accessToken1 = new AccessToken();
                accessToken1.setAccessToken(accessToken);
                accessToken1.setUpdateTime(sdf.format(new Date()));
                accessTokenService.updateAccessToken(accessToken1);
            }else{
                System.out.println("accessToken未过期，继续使用");
                accessToken = at.getAccessToken();
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return accessToken;
    }

    /**
     * 通过openId获取用户信息
     * @param openId
     * @return
     */
    public static String getUserInfo(String openId){
        String url = wxPro.getUserInfoUrl().replace("ACCESS_TOKEN",getAccessToken()).replace("OPENID",openId);
        String responseStr = (String) HttpUtil.sendGet(restTemplate,url);
        return responseStr;
    }

    /**
     * 通过code换取openId
     * @param code
     * @return
     */
    public static String getOpenId(String code){
        String url = wxPro.getOpenIdUrl().replace("APPID",APPID).replace("APPSECRET",APPSECRET).replace("CODE",code);
        String responseStr = (String) HttpUtil.sendGet(restTemplate,url);
        return responseStr;
    }
}

5.2 accessToken实体类

package com.wx.project.bean;

public class AccessToken {
    private int id;
    private String accessToken;
    private int expired;
    private String updateTime;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getAccessToken() {
        return accessToken;
    }

    public void setAccessToken(String accessToken) {
        this.accessToken = accessToken;
    }

    public int getExpired() {
        return expired;
    }

    public void setExpired(int expired) {
        this.expired = expired;
    }

    public String getUpdateTime() {
        return updateTime;
    }

    public void setUpdateTime(String updateTime) {
        this.updateTime = updateTime;
    }
}

5.3 接口地址配置文件

wx.properties

#获取accesstoken
wxpro.tokenUrl = https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET
#通过code换取openId
wxpro.openIdUrl = https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=APPSECRET&code=CODE&grant_type=authorization_code
#通过openId获取用户信息
wxpro.userInfoUrl = https://api.weixin.qq.com/cgi-bin/user/info?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN

接口地址实体

package com.wx.project.bean;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "wxpro")
@PropertySource("classpath:wx.properties")
public class WXPro {
    private String tokenUrl;
    private String userInfoUrl;
    private String openIdUrl;

    public String getTokenUrl() {
        return tokenUrl;
    }

    public void setTokenUrl(String tokenUrl) {
        this.tokenUrl = tokenUrl;
    }

    public String getUserInfoUrl() {
        return userInfoUrl;
    }

    public void setUserInfoUrl(String userInfoUrl) {
        this.userInfoUrl = userInfoUrl;
    }

    public String getOpenIdUrl() {
        return openIdUrl;
    }

    public void setOpenIdUrl(String openIdUrl) {
        this.openIdUrl = openIdUrl;
    }
}

至此。点击测试公众号上的菜单进入即可获取到用户信息。

菜鸡一枚，如有错误，麻烦指出。有疑问可留言