@Controller
@RequestMapping(value = "wx")
public class WeiController{

    /**
     * 公眾號(hào)appid
     */
    @Value("${wx.appid}")
    private  String appid;

    /**
     * 公眾號(hào)appSecret
     */
    @Value("${wx.secret}")
    private  String secret;

    /**
     * 微信消息接收和token驗(yàn)證
     * @param request
     * @param response
     * @throws IOException
     */
    @GetMapping("/weChatToken")
    public  void weChat(HttpServletRequest request, HttpServletResponse response) {
        boolean isGet = request.getMethod().toLowerCase().equals("get");
        if (isGet) {
            // 微信加密簽名
            String signature = request.getParameter("signature");
            // 時(shí)間戳
            String timestamp = request.getParameter("timestamp");
            // 隨機(jī)數(shù)
            String nonce = request.getParameter("nonce");
            // 隨機(jī)字符串
            String echostr = request.getParameter("echostr");
            // 通過檢驗(yàn)signature對(duì)請(qǐng)求進(jìn)行校驗(yàn)，若校驗(yàn)成功則原樣返回echostr，表示接入成功，否則接入失敗
            if (signature != null && CheckoutUtil.checkSignature(signature, timestamp, nonce)) {
                try {
                    PrintWriter print = response.getWriter();
                    print.write(echostr);
                    print.flush();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

public class CheckoutUtil {


    public static  String token  = "999";

    /**
     * 驗(yàn)證簽名
     * @param signature
     * @param timestamp
     * @param nonce
     * @return
     */
    public static boolean checkSignature(String signature, String timestamp, String nonce) {
        String[] arr = new String[] { token, timestamp, nonce };
        // 將token、timestamp、nonce三個(gè)參數(shù)進(jìn)行字典序排序
        Arrays.sort(arr);
        StringBuilder content = new StringBuilder();
        for (int i = 0; i < arr.length; i++) {
            content.append(arr[i]);
        }
        MessageDigest md = null;
        String tmpStr = null;

        try {
            md = MessageDigest.getInstance("SHA-1");
            // 將三個(gè)參數(shù)字符串拼接成一個(gè)字符串進(jìn)行sha1加密
            byte[] digest = md.digest(content.toString().getBytes());
            tmpStr = byteToHex(digest );
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        // 將sha1加密后的字符串可與signature對(duì)比，標(biāo)識(shí)該請(qǐng)求來源于微信
        return tmpStr != null ? tmpStr.equals(signature) : false;
    }
    
    /**
     * 十六進(jìn)制字節(jié)數(shù)組轉(zhuǎn)為字符串
     * @param hash
     * @return
     */
    private static String byteToHex(final byte[] hash) {
        Formatter formatter = new Formatter();
        for (byte b : hash) {
            formatter.format("%02x", b);
        }
        String result = formatter.toString();
        formatter.close();
        return result;
    }

@Controller
@RequestMapping(value = "wx")
public class WeiController{


    private  String appid="微信公眾號(hào)的appid";
    private  String secret="微信公眾號(hào)的secret";

    /**
     * 獲取微信用戶code，并重定向獲取用戶openId
     * @return
     */
    @GetMapping("/getUserCode")
    public String  getUserCode(){
        String backUrl = "http://xt77eg.natappfree.cc/wx/getUserOpenId";
        String getOpenIdUrl = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri="+ backUrl+"&response_type=code&scope=snsapi_base&state=STATE#wechat_redirect";
        getOpenIdUrl = getOpenIdUrl.replace("APPID",appid);
        return "redirect:" + getOpenIdUrl;
    }

    /**
     * 獲取用戶openId
     * @return
     * @throws IOException
     */
    @GetMapping("/getUserOpenId")
    @ResponseBody
    public  String getUserOpenId()throws IOException{
        //獲取code
        String code = request.getParameter("code");
        //換取用戶openid
        String url="https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code";
        url=url.replace("APPID", appid).replace("SECRET", secret).replace("CODE", code);
        JSONObject result = Util.doGetJson(url);
        JSONObject jSONObject = JSONObject.parseObject(String.valueOf(result));
        String openid = jSONObject.getString("openid");
        return openid;
    }

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--微信模版消息推送三方sdk-->
        <dependency>
            <groupId>com.github.binarywang</groupId>
            <artifactId>weixin-java-mp</artifactId>
            <version>3.3.0</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.8</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.58</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-test</artifactId>
            <version>2.1.8.RELEASE</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>

@Controller
@RequestMapping(value = "wx")
public class WeiController{
    @Resource
    PushMessageService pushMessageService;

    /**
     * 向每個(gè)用戶推送消息
     * @return
     */
    @GetMapping("/sendMessage")
    @ResponseBody
    public String sendMessage(){
        String openId =  "用戶openId";
        if(!"".equals(openId)){
            AlarmParamsDTO dto = new AlarmParamsDTO("申請(qǐng)進(jìn)度", "國(guó)家獎(jiǎng)學(xué)金", "申請(qǐng)通過", time, "成功");
            dto.setOpenId(openId);
            pushMessageService.pushMessage(dto);
        }
        return "success";
    }

@Service
@Slf4j
public class PushMessageServiceImpl implements PushMessageService{

    private  String appid="微信公眾號(hào)appid";
    private  String secret="微信公眾號(hào)secret";

    /**
     * 給微信公眾號(hào)某個(gè)用戶推送信息
     * @param alarmParamsDTO
     */
    @Override
    public void pushMessage(AlarmParamsDTO alarmParamsDTO) {
        //1，配置
        WxMpInMemoryConfigStorage wxStorage = new WxMpInMemoryConfigStorage();
        wxStorage.setAppId(appid);
        wxStorage.setSecret(secret);
        WxMpService wxMpService = new WxMpServiceImpl();
        wxMpService.setWxMpConfigStorage(wxStorage);
        List<WxMpTemplateData> wxMpTemplateData = Arrays.asList(
                new WxMpTemplateData("first",alarmParamsDTO.getFirst(),"#000000"),
                new WxMpTemplateData("keyword1",alarmParamsDTO.getKeyword1(),"#000080"),
                new WxMpTemplateData("keyword2",alarmParamsDTO.getKeyword2(),"#0000FF"),
                new WxMpTemplateData("keyword3",alarmParamsDTO.getKeyword3(),"#FFD700"),
                new WxMpTemplateData("remark",alarmParamsDTO.getRemark(),"#00FF00")
        );
        //2,推送消息
        WxMpTemplateMessage templateMessage = WxMpTemplateMessage.builder()
                .toUser(alarmParamsDTO.getOpenId())
                .templateId("tIDrdFcqFGMsTnc462H49_DbjgXUuIjsqIlQttq7VDE")
                .data(wxMpTemplateData)
                .url("http://www.baidu.com")
                .build();
        try {
            wxMpService.getTemplateMsgService().sendTemplateMsg(templateMessage);
        } catch (Exception e) {
            System.out.println("推送失?。? + e.getMessage());
        }

    }
}

@Setter
@Getter
@NoArgsConstructor
@AllArgsConstructor
public class AlarmParamsDTO {


    /**
     * 推送信息小標(biāo)題
     */
    private String first;

    /**
     * 學(xué)生姓名
     */
    private String keyword1;

    /**
     * 申請(qǐng)資助類型
     */
    private String keyword2;

    /**
     * 申請(qǐng)狀態(tài)
     */
    private String keyword3;

    /**
     * 申請(qǐng)結(jié)果
     */
    private String remark;

    /**
     * 用戶微信openId，唯一標(biāo)識(shí)
     */
    private String openId;

    public AlarmParamsDTO(String first, String keyword1, String keyword2, String keyword3, String remark) {
        this.first = first;
        this.keyword1 = keyword1;
        this.keyword2 = keyword2;
        this.keyword3 = keyword3;
        this.remark = remark;
    }
}