微信小程序订阅消息推送（附带后台java代码）_微信推送消息java版

官方文档：
小程序前端:点击进入
小程序服务端:点击进入

一，代码实现（后端）

①定义实体类

package com.saic.fin.system.sendInfo;
 
import lombok.Data;
 
import java.util.Map;
 
@Data
public class WxMsgVo {
 
    private String touser;//用户openId
    private String template_id;//模版id
    private Map<String , TemplateData> data;//推送文字
    private String page="pages/index/index";//跳转路径 ，默认跳转到小程序首页
 
}

package com.saic.fin.system.sendInfo;
 
public class TemplateData {
    private String value;
 
    public TemplateData(String value) {
        this.value = value;
    }
 
    public String getValue() {
        return value;
    }
 
    public void setValue(String value) {
        this.value = value;
    }
}

②定义HttpUtil类(Get请求)

package com.saic.fin.system.util;
 
import com.alibaba.fastjson.JSONObject;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
 
 
public class HttpUtil {
    public static final String APPID = "";//小程序APPID(小程序ID)
    public static final String APPSECRET = "";//小程序APPSECRET(小程序秘钥)
    public static JSONObject doGetJson(String URL) throws IOException {
        JSONObject jsonObject = null;
        HttpURLConnection conn = null;
        InputStream is = null;
        BufferedReader br = null;
        StringBuilder result = new StringBuilder();
        try {
            //创建远程url连接对象
            URL url = new URL(URL);
            //通过远程url连接对象打开一个连接，强转成HTTPURLConnection类
            conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            //设置连接超时时间和读取超时时间
            conn.setConnectTimeout(15000);
            conn.setReadTimeout(60000);
            conn.setRequestProperty("Accept", "application/json");
            //发送请求
            conn.connect();
            //通过conn取得输入流，并使用Reader读取
            if (200 == conn.getResponseCode()) {
                is = conn.getInputStream();
                br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                String line;
                while ((line = br.readLine()) != null) {
                    result.append(line);
                    System.out.println(line);
                }
            } else {
                System.out.println("ResponseCode is an error code:" + conn.getResponseCode());
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null) {
                    br.close();
                }
                if (is != null) {
                    is.close();
                }
            } catch (IOException ioe) {
                ioe.printStackTrace();
            }
            conn.disconnect();
        }
        jsonObject = JSONObject.parseObject(result.toString());
        return jsonObject;
    }
}

③验证token过期时间

package com.saic.fin.system.OfficialAccounts;
 
import lombok.Data;
 
@Data
public class AccessToken {
    private String accessToken;
    //过期时间 当前系统时间+微信传来的过期时间
    private Long expiresTime;
 
    public AccessToken(String accessToken, String expiresIn) {
        this.accessToken = accessToken;
        this.expiresTime = System.currentTimeMillis()+Integer.parseInt(expiresIn)*1000;
    }
 
    /**
     * 判断token是否过期
     * @return
     */
    public boolean isExpired(){
        return System.currentTimeMillis()>expiresTime;
    }
}

④小程序发送消息

package com.saic.fin.system.sendInfo;
 
import com.alibaba.fastjson.JSONObject;
import com.saic.fin.system.OfficialAccounts.AccessToken;
import com.saic.fin.system.util.AuthUtil;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
 
import java.util.HashMap;
import java.util.Map;
 
/**
 * 发送小程序订阅消息
 */
public class SendWxMessage {
 
    public static final String APP_ACCESS_TOKEN_URL= "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+HttpUtil.APPID+"&secret="+HttpUtil.APPSECRET;
 
    private static AccessToken at;
    public static String push(String openid) {
        RestTemplate restTemplate = new RestTemplate();
        String accessToken = getToken();
        //这里简单起见我们每次都获取最新的access_token（时间开发中，应该在access_token快过期时再重新获取）
        String url = "https://api.weixin.qq.com/cgi-bin/message/subscribe/send?access_token=" + accessToken;
        //拼接推送的模版
        WxMsgVo wxMsgVo = new WxMsgVo();
        wxMsgVo.setTouser(openid);//用户的openid（要发送给那个用户）
        wxMsgVo.setTemplate_id("CFeSWarQLMPyPjwmiy6AV4eB-IZcipu48V8bFLkBzTU");//订阅消息模板id
        wxMsgVo.setPage("pages/index/index");
 
        Map<String, TemplateData> m = new HashMap<>(3);
        m.put("thing1", new TemplateData("课程"));
        m.put("thing6", new TemplateData("大学"));
        m.put("thing7", new TemplateData("一节"));
        wxMsgVo.setData(m);
        ResponseEntity<String> responseEntity =
                restTemplate.postForEntity(url, wxMsgVo, String.class);
        return responseEntity.getBody();
    }
 
 
    public static String getToken(){
        if (at == null || at.isExpired()){
            getAccessToken();
        }
        return at.getAccessToken();
    }
 
    /**
     * 获取token
     */
    private static void getAccessToken() {
        //发送请求获取token
        JSONObject token = null;
        try {
            token = AuthUtil.doGetJson(APP_ACCESS_TOKEN_URL);
        } catch (Exception e) {
            e.printStackTrace();
        }
        JSONObject jsonObject = token;
        String accessToken = (String) jsonObject.get("access_token");
        Integer expiresIn = (Integer) jsonObject.get("expires_in");
        //创建token对象，并存储
        at = new AccessToken(accessToken,String.valueOf(expiresIn));
    }
}

AuthUtil工具类

package com.saic.fin.system.util;
 
import com.alibaba.fastjson.JSONObject;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
 
/**
 * 微信授权登录调用Util
 */
public class AuthUtil {
    public static final String APPID = "xxxxxx";//小程序APPID(小程序ID)
    public static final String APPSECRET = "xxxxxxxxxxx";//小程序APPSECRET(小程序秘钥)
    public static JSONObject doGetJson(String URL) throws IOException {
        JSONObject jsonObject = null;
        HttpURLConnection conn = null;
        InputStream is = null;
        BufferedReader br = null;
        StringBuilder result = new StringBuilder();
        try {
            //创建远程url连接对象
            URL url = new URL(URL);
            //通过远程url连接对象打开一个连接，强转成HTTPURLConnection类
            conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            //设置连接超时时间和读取超时时间
            conn.setConnectTimeout(15000);
            conn.setReadTimeout(60000);
            conn.setRequestProperty("Accept", "application/json");
            //发送请求
            conn.connect();
            //通过conn取得输入流，并使用Reader读取
            if (200 == conn.getResponseCode()) {
                is = conn.getInputStream();
                br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                String line;
                while ((line = br.readLine()) != null) {
                    result.append(line);
                    System.out.println(line);
                }
            } else {
                System.out.println("ResponseCode is an error code:" + conn.getResponseCode());
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null) {
                    br.close();
                }
                if (is != null) {
                    is.close();
                }
            } catch (IOException ioe) {
                ioe.printStackTrace();
            }
            conn.disconnect();
        }
        jsonObject = JSONObject.parseObject(result.toString());
        return jsonObject;
    }
}