微信公众平台开发（四）——微信网页授权：获取用户openid&用户基本信息

package cn.kt.mywxdemo.wechatmp.config;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.Map;
/**
 * Created by tao.
 * Date: 2023/3/21 15:02
 * 描述:
 */
@Data

@Component

//从配置文件里获取

@ConfigurationProperties(prefix = "wechat")

public class WechatAccountConfig {
/**
 * 公众平台id
 */
private String mpAppId;

/**
 * 公众平台密钥
 */
private String mpAppSecret;

/**
 * 微信模版id
 */
private Map<String, String> templateId;

}

package cn.kt.mywxdemo.wechatmp.config;

import me.chanjar.weixin.mp.api.WxMpConfigStorage;

import me.chanjar.weixin.mp.api.WxMpInMemoryConfigStorage;

import me.chanjar.weixin.mp.api.WxMpService;

import me.chanjar.weixin.mp.api.impl.WxMpServiceImpl;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.Bean;

import org.springframework.stereotype.Component;

/**

Created by tao.
Date: 2023/3/21 15:00
描述:

*/

@Component

public class WechatMpConfig {
@Autowired
private WechatAccountConfig accountConfig;

/**
 * @author ：tao
 * @date ：Created in 2021/3/12 10:15
 * @param: ：
 * @return： WxMpService 对象
 * 配置wxMpConfigStorage,返回 WxMpService 对象
 */
@Bean
public WxMpService wxMpService() {
    WxMpService wxMpService = new WxMpServiceImpl();
    wxMpService.setWxMpConfigStorage(wxMpConfigStorage());
    return wxMpService;
}

/**
 * @author ：tao
 * @date ：Created in 2021/3/12 10:20
 * @param: ：
 * @return： WxMpConfigStorage 对象
 * 配置AppId、和AppSecret，获取WxMpConfigStorage 对象
 */
@Bean
public WxMpConfigStorage wxMpConfigStorage() {
    WxMpInMemoryConfigStorage wxMpConfigStorage = new WxMpInMemoryConfigStorage();
    wxMpConfigStorage.setAppId(accountConfig.getMpAppId());
    wxMpConfigStorage.setSecret(accountConfig.getMpAppSecret());
    return wxMpConfigStorage;
}

}

package cn.kt.mywxdemo.wechatmp.controller;

import lombok.extern.slf4j.Slf4j;

import me.chanjar.weixin.common.api.WxConsts;

import me.chanjar.weixin.common.exception.WxErrorException;

import me.chanjar.weixin.mp.api.WxMpService;

import me.chanjar.weixin.mp.bean.result.WxMpOAuth2AccessToken;

import me.chanjar.weixin.mp.bean.result.WxMpUser;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.*;
import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;
/**

Created by tao.
Date: 2023/3/21 15:04
描述:

*/

@Controller

@RequestMapping("/wechat")

@Slf4j

public class WxJsController {
@Autowired
private WxMpService wxMpService;

@Value("${wechat.projecturl}")
private String projectUrl;

@GetMapping("/auth")
@ResponseBody
public String auth(@RequestParam(value = "echostr", defaultValue = "没有获取到") String echostr) {
    return echostr;
}

/**
 * @author ：tao
 * @param: ：
 * @return： 重定向到获取用户信息的类
 * 微信授权登录
 */
@GetMapping("/authorize")
public String authorize(@RequestParam(value = "returnUrl", defaultValue = "https://qkongtao.cn/") String returnUrl) throws UnsupportedEncodingException {
    log.info("【微信网页授权】进来了，参数={}", returnUrl);
    System.out.println("进来了:" + returnUrl);
    //1. 配置
    //2. 调用方法
    String url = projectUrl + "wechat/userInfo";
    /*
     * 相当于这种形式
     * URLEncoder.decode(returnUrl,"UTF-8"
     * https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
     */
    String redirectUrl = wxMpService.oauth2buildAuthorizationUrl(url, WxConsts.OAUTH2_SCOPE_USER_INFO, URLEncoder.encode(returnUrl, "utf-8"));
    log.info("【微信网页授权】获取code,result={}", redirectUrl);
    return "redirect:" + redirectUrl;
}

/**
 * @author ：tao
 * @param: ：
 * @return： 重定向
 * 获取用户信息类，最后重定向到指定url
 */
@GetMapping("/userInfo")
public String userInfo(@RequestParam("code") String code,
                       @RequestParam("state") String returnUrl) throws WxErrorException {
    /*当用户同意授权后，会回调所设置的url并把authorization code传过来，
    然后用这个code获得access token，其中也包含用户的openid等信息*/
    WxMpOAuth2AccessToken wxMpOAuth2AccessToken = new WxMpOAuth2AccessToken();
    try {
        //获取access token
        wxMpOAuth2AccessToken = wxMpService.oauth2getAccessToken(code);
        log.info("【AccessToken：】{}", wxMpOAuth2AccessToken.getAccessToken());
    } catch (WxErrorException e) {
        log.error("【微信网页授权】{}", e);
    }

    // 拿到openid
    String openId = wxMpOAuth2AccessToken.getOpenId();
    log.info("【openid：】{}", openId);
    log.info("【我是前端要回调的地址：】{}", returnUrl + "&openid=" + openId);
    // 顺便获取一下用户信息
    WxMpUser wxMpUser = wxMpService.oauth2getUserInfo(wxMpOAuth2AccessToken, "zh_CN");
    log.info("【用户信息：】{}", wxMpUser.toString());

    //注意拼接参数，第一个参数需要加问号，之后参数使用&拼接的问题
    //return "redirect:" + returnUrl + "/#/?openid=" + openId;
    return "redirect:" + returnUrl + "&openid=" + openId;
}

}