1.獲取微信access_token并生成Url Scheme

@Slf4j
@Api(tags = "微信模塊")
@RestController
@RequestMapping("/weChat")
public class WeChatController {


    @Autowired
    private WeChatService weChatService;
    @Autowired
    private RedisUtil redisUtil;
    @Value("${wxConfig.app-id}")
    private String AppID;
    @Value("${wxConfig.app-secret}")
    private String AppSecret;

    

    /**
     * @return {@link String}
     * @author macro
     * @description 獲取微信小程序token
     */
    @AutoLog(value = "獲取微信小程序token")
    @ApiOperation(value = "獲取微信小程序token", notes = "獲取微信小程序token")
    @GetMapping(value = "/getAccessToken")
    public String getAccessToken() throws IOException {
        //1.先判斷redis有沒有
        if (redisUtil.hasKey("access_token")) {
            //redis有直接返回
            return redisUtil.get("access_token").toString();
        } else {
            //2.redis沒有
            /*2.1請求微信 獲取token*/
            String httpUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential";
            httpUrl = httpUrl + "&appid=" + AppID + "&secret=" + AppSecret;
            CloseableHttpClient client = HttpClients.createDefault();
            HttpGet httpGet = new HttpGet(httpUrl);
            CloseableHttpResponse res = client.execute(httpGet);
            HttpEntity entity = res.getEntity();
            String result = EntityUtils.toString(entity, "UTF-8");
            JSONObject jsonObject = JSON.parseObject(result);
            if (jsonObject.containsKey("access_token")) {
                String accessToken = jsonObject.getString("access_token");
                //放入redis,并設(shè)置過期時間為兩小時
                redisUtil.set("access_token", accessToken);
                redisUtil.expire("access_token", 2 * 60 * 60);
                return accessToken;
            } else {
                return null;
            }
        }
    }


    /**
     * @return {@link Map< String, Object>}
     * @author macro
     * @description 生成小程序跳轉(zhuǎn)鏈接
     */
    @AutoLog(value = "生成小程序跳轉(zhuǎn)鏈接")
    @ApiOperation(value = "生成小程序跳轉(zhuǎn)鏈接", notes = "生成小程序跳轉(zhuǎn)鏈接")
    @PostMapping(value = "/getAppletUrl")
    public Result<?> getAppletUrl(@RequestBody UrlSchemeQueryDTO queryEntity) throws IOException {
        //校驗(yàn)參數(shù)，參數(shù)都傳遞了才能生成url并跳轉(zhuǎn)
        if (StringUtils.isBlank(queryEntity.getDyId()) || StringUtils.isBlank(queryEntity.getJumpPath()) ||
                null == queryEntity.getCoinAmt() || BigDecimal.ZERO.compareTo(queryEntity.getCoinRmb()) == 0) {
            return Result.error("請求參數(shù)非法!");
        }

        //微信生成 URL Scheme接口地址
        String httpUrl = "https://api.weixin.qq.com/wxa/generatescheme?access_token=";
        //需要跳轉(zhuǎn)的小程序路徑
        String path = "pages/pay/index";
        //獲取AccessToken
        String AccessToken = this.getAccessToken();
        //token為空，報(bào)錯返回
        if (AccessToken == null) {
            return Result.error("未獲取到token!");
        } else {
            /*token非空 拿著token去請求*/
            try {
                JSONObject jsonParam = new JSONObject();
                JSONObject jump_wxa = new JSONObject();
                //跳轉(zhuǎn)參數(shù)-跳轉(zhuǎn)的頁面路徑
                jump_wxa.put("path", queryEntity.getJumpPath());
                jump_wxa.put("query", "dyId=" + queryEntity.getDyId() + "&coinAmt=" + queryEntity.getCoinAmt() + "&coinRmb=" + queryEntity.getCoinRmb().toString());
                //小程序環(huán)境  release:正式
                jump_wxa.put("env_version", "release");
                //跳轉(zhuǎn)到的目標(biāo)小程序信息。
                jsonParam.put("jump_wxa", jump_wxa);
                //默認(rèn)值0，到期失效的 scheme 碼失效類型，失效時間：0，失效間隔天數(shù)：1
                jsonParam.put("expire_type", 1);
                //到期失效的 scheme 碼的失效間隔天數(shù)。生成的到期失效 scheme 碼在該間隔時間到達(dá)前有效。最長間隔天數(shù)為30天。is_expire 為 true 且 expire_type 為 1 時必填
                jsonParam.put("expire_interval", 2);
                String params = jsonParam.toString();
                //請求微信接口，獲取url
                JSONObject resultUrl = getUrlScheme(httpUrl, AccessToken, params);

                //請求微信接口，生成失敗,返回錯誤碼及錯誤信息
                if (!resultUrl.getString("errcode").equals("0")) {
                    return Result.error(resultUrl.getString("errcode"), resultUrl.getString("errmsg"));
                }
                /*請求成功 返回url*/
                String newUrl = resultUrl.getString("openlink");
                return Result.ok(newUrl);
            } catch (SocketTimeoutException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    /**
     * @param httpUrl     微信接口的url
     * @param accessToken token
     * @param params      請求參數(shù)
     * @author: macro
     * @description: 請求URL Scheme接口，獲取url
     * @return: com.alibaba.fastjson.JSONObject URL
     **/
    private JSONObject getUrlScheme(String httpUrl, String accessToken, String params) throws IOException {
        String content;
        CloseableHttpClient httpClient = HttpClients.createDefault();
        RequestConfig requestConfig = RequestConfig.custom()
                .setSocketTimeout(300 * 1000)
                .setConnectTimeout(300 * 1000)
                .build();
        HttpPost post = new HttpPost(httpUrl + accessToken);
        post.setConfig(requestConfig);
        post.setHeader("Content-Type", "application/json;charset=utf-8");
        //URLEncoder.encode(name)
        StringEntity postingString = new StringEntity(params, "utf-8");
        post.setEntity(postingString);
        CloseableHttpResponse response = httpClient.execute(post);
        content = EntityUtils.toString(response.getEntity());
        JSONObject resultUrl = JSONObject.parseObject(content);
        return resultUrl;
    }


}

2.前端獲取Url Scheme跳轉(zhuǎn)到微信小程序

wxPay() {
        // ======================獲取跳轉(zhuǎn)的URL==============================
        //跳轉(zhuǎn)的微信小程序的路徑,傳遞給后端進(jìn)行處理
        this.info.jumpPath="pages/pay/index"
        /*獲取URL*/
        let jumpUrl=''
        uni.request({
          url: configService.apiUrl + this.url.getAppletUrl,
          method: 'POST',
          data: this.info,
          success: (result) => {
            if(result.data.success){
              jumpUrl=result.data.result
              //獲取到URL進(jìn)行跳轉(zhuǎn)
              window.location.href=jumpUrl
            }
          },
          fail: function (err) {
            uni.showToast({
              title: '打開失敗,請稍后再試!',
              icon: 'none',
              duration: 2000
            })
          }
        });
			},

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