获取微信 access_token，ticket，signature

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代码记录：

package com.yunxi.access.action;

import com.alibaba.fastjson.JSONObject;
import com.yunxi.access.constant.config.RedisCache;
import com.yunxi.util.common.RandomCreateCode;
import com.yunxi.util.http.HttpPostUtil;
import com.yunxi.util.security.Sha1;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.net.URLDecoder;

import static com.yunxi.util.common.RandomCreateCode.MODE_CHARACTER;

/**
 * 微信js分享
 * 获取 access_token，ticket，signature
 * @Author QZJ
 * @CreateTime 2018/12/20
 */
@RestController
public class WxAction {

    @Value("${wx.appId}")
    String appId;
    @Value("${wx.appSecret}")
    String appSecret;
    @Autowired
    RedisCache redisCache;
    private static final String ACCESS_TOKEN = "ACCESS_TOKEN";
    private static final String JS_TICKET = "JS_TICKET";
    private static final int EXPIRE_TIME = 120 * 60;

    @ApiOperation(value = "获取微信分享信息", notes = "JSON")
    @PostMapping("/getWxInfo")
    public @ResponseBody
    JSONObject getWxInfo(@RequestParam(value = "shareLink") String shareLink) throws Exception {
        // 获取token
        String accessToken = getValue("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appId + "&secret=" + appSecret, "access_token", ACCESS_TOKEN);
        // 获取 ticket 注意链接前端需要encode，因为包含连接符
        String ticket = getValue("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + accessToken + "&type=jsapi", "ticket", JS_TICKET);
        //  生成签名
        return getSignature(ticket, shareLink);
    }

    /**
     * 生成签名信息
     * @param ticket
     * @param shareLink
     * @return
     * @throws Exception
     */
    private JSONObject getSignature(String ticket, String shareLink) throws Exception {
        JSONObject wxObject = new JSONObject();
        Long timestamp = System.currentTimeMillis() / 1000;
        String nonceStr = RandomCreateCode.randomNumber(10, MODE_CHARACTER);
        String param = "jsapi_ticket=" + ticket + "&noncestr=" + nonceStr + "&timestamp=" + timestamp + "&url=" + URLDecoder.decode(shareLink, "utf-8");
        wxObject.put("timestamp", timestamp);
        wxObject.put("nonceStr", nonceStr);
        wxObject.put("signature", Sha1.encode(param));
        return wxObject;
    }

    /**
     * 取微信值 并 存储 redis
     *
     * @param url
     * @param key
     * @param redisKey
     * @return
     * @throws Exception
     */
    private String getValue(String url, String key, String redisKey) throws Exception {
        // 从redis中取值
        String value = redisCache.getValue(redisKey);
        if (!StringUtils.isEmpty(value)) {
            return value;
        }
        // 微信取值
        String result = HttpPostUtil.sendPost(url, "", HttpPostUtil.FORM);
        value = JSONObject.parseObject(result).getString(key);
        // 存储
        redisCache.setValue(redisKey, value, EXPIRE_TIME);
        return value;
    }


}