使用Java实现微信公众号推送模板消息（保证能用）

背景：

　　还是那个业务背景，面向微信公众号开发，指定针对用户发送消息，胖友们，我研究了一天了，代码粘过去，用不了你锤死我

1、pom.xml文件中添加依赖

<!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.wso2.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>4.3.1.wso2v1</version>
        </dependency>
        <dependency>
            <groupId>org.wso2.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.3.1.wso2v1</version>
        </dependency>
        <!-- json -->
        <dependency>
            <groupId>top.jfunc.json</groupId>
            <artifactId>json-fastjson</artifactId>
            <version>1.8.3</version>
        </dependency>

DataEntity.java

@Getter
@Setter
public class DataEntity {    
    //内容
    private String value;
    //字体颜色
    private String color;
    
    public DataEntity(String value ,String color){
        this.value = value;
        this.color = color;
    }

实现类: 有“XXX”的地方需要修改，其他地方可以不用动

WechatMsg.java

@Component
public class WechatMsg {
    
    public static void main(String[] args) {
        WechatMsg wm = new WechatMsg();
        wm.SendWeChatMsg(wm.getToken());
    }
    /**
     * 获取token
     * 
     * @return token
     */
    public String getToken() {
        // 授予形式
        String grant_type = "client_credential";
        //应用ID
        String appid = "XXXXXXXXXXXXXXXXXXX";
        //密钥
        String secret = "XXXXXXXXXXXXXXXXXXXXXXXXXX";
        // 接口地址拼接参数
        String getTokenApi = "https://api.weixin.qq.com/cgi-bin/token?grant_type=" + grant_type + "&appid=" + appid
                + "&secret=" + secret;
        String tokenJsonStr = doGetPost(getTokenApi, "GET", null);
        JSONObject tokenJson = JSONObject.parseObject(tokenJsonStr);
        String token = tokenJson.get("access_token").toString();
        System.out.println("获取到的TOKEN : " + token);
        return token;
    }
    /***
     * 发送消息
     * 
     * @param token
     */
    public void SendWeChatMsg(String token) {
        // 接口地址
        String sendMsgApi = "https://api.weixin.qq.com/cgi-bin/message/template/send?access_token="+token;
        //openId
        String toUser = "XXXXXXXXXXXXXX";
        //消息模板ID
        String template_id = "XXXXXXXXXXXXXXXXXXXXXX";
        //整体参数map
        Map<String, Object> paramMap = new HashMap<String, Object>();
        //消息主题显示相关map
        Map<String, Object> dataMap = new HashMap<String, Object>();
        //根据自己的模板定义内容和颜色
        dataMap.put("first",new DataEntity("详细内容XXXXXXX","#173177"));
        dataMap.put("keyword1",new DataEntity("私有化部署XXX","#173177"));
        dataMap.put("keyword2",new DataEntity("2020-08-18XXX" ,"#173177"));
        dataMap.put("remark",new DataEntity("申请成功XXX","#173177"));
        paramMap.put("touser", toUser);
        paramMap.put("template_id", template_id);
        paramMap.put("data", dataMap);
        System.out.println(doGetPost(sendMsgApi,"POST",paramMap));
    }
    /**
     * 调用接口 post
     * @param apiPath
     */
    public String doGetPost(String apiPath,String type,Map<String,Object> paramMap){
        OutputStreamWriter out = null;
        InputStream is = null;
        String result = null;
        try{
            URL url = new URL(apiPath);// 创建连接
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setUseCaches(false);
            connection.setInstanceFollowRedirects(true);
            connection.setRequestMethod(type) ; // 设置请求方式
            connection.setRequestProperty("Accept", "application/json"); // 设置接收数据的格式
            connection.setRequestProperty("Content-Type", "application/json"); // 设置发送数据的格式
            connection.connect();
            if(type.equals("POST")){
                out = new OutputStreamWriter(connection.getOutputStream(), "UTF-8"); // utf-8编码
                out.append(JSON.toJSONString(paramMap));
                out.flush();
                out.close();
            }
            // 读取响应
            is = connection.getInputStream();
            int length = (int) connection.getContentLength();// 获取长度
            if (length != -1) {
                byte[] data = new byte[length];
                byte[] temp = new byte[512];
                int readLen = 0;
                int destPos = 0;
                while ((readLen = is.read(temp)) > 0) {
                    System.arraycopy(temp, 0, data, destPos, readLen);
                    destPos += readLen;
                }
                result = new String(data, "UTF-8"); // utf-8编码
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return  result;
    }
}

效果图

 附微信接口文档：https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Template_Message_Interface.html