使用第三方SDK进行网页授权

springboot项目

1.引入pom依赖

dependency>
    <groupId>com.github.binarywang</groupId>
    <artifactId>weixin-java-mp</artifactId>
    <version>2.7.0</version>
</dependency>

2.创建配置类，引入参数

package com.imooc.sell.config;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

/**微信支付与网页授权的配置对象类
 * @Author:
 * @Date: 2019/3/15 17:50
 * @Version 1.0
 */
@Data
@Component
@ConfigurationProperties(prefix = "wechat")
public class WechatAccountConfig {
/*公众号appid*/
    private String mpAppId;
/*公众号secret*/
    private String mpAppSecret;
   
   

}

3.创建配置类返回一个WxMpService,为神魔要这个对象可以参考sdk

package com.imooc.sell.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;

/**
 * @Author: 
 * @Date: 2019/3/15 17:41
 * @Version 1.0
 */
@Component//注解为配置类
public class WechatMPConfig {
    @Autowired
    WechatAccountConfig wechatAccountConfig;
    @Bean
    public WxMpService wxMpService()
    {
        WxMpService wxMpService = new WxMpServiceImpl();
        wxMpService.setWxMpConfigStorage(wxMpConfigStorage());
        return wxMpService;
    }
    @Bean
    public WxMpConfigStorage wxMpConfigStorage()
    {
        WxMpInMemoryConfigStorage wxMpConfigStorage = new WxMpInMemoryConfigStorage();
        //在这里我们要设置appid 和 appsecret 需要在配置文件里面设置两个变量，这样全局都可以用
        //然后设置一个WechatAccountConfig类，来注入这两个参数，这样在使用的时候就可以直接调用这两个类
         wxMpConfigStorage.setAppId(wechatAccountConfig.getMpAppId());
         wxMpConfigStorage.setSecret(wechatAccountConfig.getMpAppSecret());
         return  wxMpConfigStorage;
    }
}

4.创建WechatController

package com.imooc.sell.controller;

import com.imooc.sell.enums.ResultEnum;
import com.imooc.sell.exception.ResultException;
import lombok.extern.slf4j.Slf4j;
import me.chanjar.weixin.common.api.WxConsts;
import me.chanjar.weixin.common.bean.WxAccessToken;
import me.chanjar.weixin.common.exception.WxErrorException;
import me.chanjar.weixin.mp.api.WxMpService;
import me.chanjar.weixin.mp.api.impl.WxMpServiceImpl;
import me.chanjar.weixin.mp.bean.result.WxMpOAuth2AccessToken;
import net.bytebuddy.asm.Advice;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.net.URLEncoder;

/**
 * @Author: 
 * @Date: 2019/3/15 17:38
 * @Version 1.0
 */
@Controller
@RequestMapping("/wechat")
@Slf4j
public class WechatController {
    @Autowired
  private WxMpService wxMpService;

    @GetMapping("/authorize")
    public String  authorize(@RequestParam("returnUrl") String returnUrl)
    {

        //1.配置
        //2.调用方法
        String url = "http://ajungesell.natapp1.cc/sell/wechat/userinfo";
        //返回之后从定向的url,调用方法
        String  redirectUrl = wxMpService.oauth2buildAuthorizationUrl(url, WxConsts.OAUTH2_SCOPE_BASE, URLEncoder.encode(returnUrl));
        log.info("【微信网页授权】返回redirectUrl = {}",redirectUrl  );

        return "redirect:"+redirectUrl;

    }
    @GetMapping("/userinfo")
    public String  userInfo(@RequestParam("code") String code,
                         @RequestParam("state") String returnUrl){
        WxMpOAuth2AccessToken wxMpOAuth2AccessToken  = new WxMpOAuth2AccessToken();
        try {
            wxMpOAuth2AccessToken = wxMpService.oauth2getAccessToken(code);
        } catch (WxErrorException e) {
            log.error("【微信网页授权】获取accessToken失败");
         
        }
        String openId = wxMpOAuth2AccessToken.getOpenId();
        log.info("【微信网页授权】openid={}",openId);

         return "redirect:"+returnUrl+"?openid="+ openId;

    }
}

这样我们就可以通过访问http://域名/项目名/wechat/authorize?return_url=XXXXXXX在微信里面获取到授权了

注意域名必须是可以在外网访问的