H5 authorized landing micro letter

Controller
package com.iimscloud.auth.provider.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
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 org.springframework.web.client.RestTemplate;

import com.alibaba.fastjson.JSONObject;
import com.iimscloud.auth.provider.WechatUtils;
import com.iimscloud.common.exception.OpenAlertException;
import com.iimscloud.common.utils.StringUtils;

import lombok.extern.slf4j.Slf4j;

/**
 * @author wjc
 * @description
 * @date 2019/8/30
 */
@Slf4j
@RestController
@RequestMapping("/wechat")
public class WechatController {

    @Autowired
    private RestTemplate restTemplate;

    @Value("${iimscloud.auth.wechat.token}")
    private String token;

    /**
     * @description 微信公众平台基本配置-token
     * @author wjc
     * @date 2019/8/30
     */
    @GetMapping("/token")
    public String token(@RequestParam(value = "signature") String signature,
                        @RequestParam(value = "timestamp") String timestamp,
                        @RequestParam(value = "nonce") String nonce,
                        @RequestParam(value = "echostr") String echostr){
        if (!WechatUtils.checkSignature(token, signature, timestamp, nonce)){
            log.error("匹配微信token失败");
            return null;
        }
        return echostr;
    }

    @GetMapping("/getH5AccessToken")
    public void getH5AccessToken(String code){
        String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=wx89c30d0db583ae38&secret=87629847f9f55684d37588bc629c5a12&code="+code+"&grant_type=authorization_code";
        String result = restTemplate.getForObject(url, null);
        JSONObject jsonObject = JSONObject.parseObject(result);
        String openid = jsonObject.getString("openid");
        String access_token = jsonObject.getString("access_token");
        log.info("openid: " + openid);
        log.info("access_token: " + access_token);
    }

    @GetMapping("/getWechatAccessToken")
    public String getAccessToken(String appid, String appSecret){
        StringBuffer url = new StringBuffer("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential");
        url.append("appid=").append(appid).append("appSecret=").append(appSecret);
        String result = restTemplate.getForObject(url.toString(), null);

        JSONObject jsonObject = JSONObject.parseObject(result);
        String access_token = jsonObject.getString("access_token");
        if(StringUtils.isNotBlank(access_token)){
            throw new OpenAlertException("获取access_token失败");
        }
//        redisTemplate.opsForValue().set("access_token", access_token, 7200);
        return access_token;
    }

}

WechatUtils

package com.iimscloud.auth.provider;

import com.alibaba.fastjson.JSONObject;
import com.iimscloud.common.exception.OpenAlertException;
import com.iimscloud.common.utils.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.client.RestTemplate;

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

/**
 * @author wjc
 * @description 微信相关工具类
 * @date 2019/8/30
 */
public class WechatUtils {

    @Autowired
    private static RedisTemplate redisTemplate;
    @Autowired
    private static RestTemplate restTemplate;
    @Value("${iimscloud.auth.wechat.appid}")
    private String appid;
    @Value("${iimscloud.auth.wechat.appSecret}")
    private String appSecret;

    /**
     * @description 校验微信参数
     * @author wjc
     * @date 2019/8/30
     */
    public static boolean checkSignature(String token, String signature, String timestamp, String nonce){
        String [] arr = {token, timestamp, nonce};
        Arrays.sort(arr);
        StringBuffer sbf = new StringBuffer();
        for (String str : arr){
            sbf.append(str);
        }
        String getSignature = getSha1(sbf.toString());
        return signature.equals(getSignature);
    }

    public static String getSha1(String str){
        if(str==null || str.length()==0){
            return null;
        }
        char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
        try {
            MessageDigest mdTemp=MessageDigest.getInstance("SHA1");
            mdTemp.update(str.getBytes("UTF-8"));
            byte[] md=mdTemp.digest();
            int j=md.length;
            char buf[]=new char[j*2];
            int k=0;
            for(int i=0;i<j;i++){
                byte byte0=md[i];
                buf[k++]=hexDigits[byte0>>>4 & 0xf];
                buf[k++]=hexDigits[byte0 & 0xf];
            }
            return new String(buf);
        } catch (Exception e) {
            return null;
        }
    }

}