Java微信公众号推送模版消息的步骤示例详解

<dependency>  
    <groupId>org.apache.httpcomponents</groupId>  
    <artifactId>httpclient</artifactId>  
    <version>4.5.13</version>  
</dependency>

import org.apache.http.client.methods.HttpGet;  
import org.apache.http.impl.client.CloseableHttpClient;  
import org.apache.http.impl.client.HttpClients;  
import org.apache.http.util.EntityUtils;  
public class WeChatUtil {  
    private static final String APP_ID = "我们的AppID";  
    private static final String APP_SECRET = "我们的AppSecret";  
    private static final String TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={}&secret={}";  
    public static String getAccessToken() throws Exception {  
        String url = TOKEN_URL.replace("{}", APP_ID).replace("{}", APP_SECRET);  
        HttpGet request = new HttpGet(url);  
        CloseableHttpClient httpClient = HttpClients.createDefault();  
        String result = httpClient.execute(request, httpResponse ->  
                EntityUtils.toString(httpResponse.getEntity()));  
        // 解析JSON获取access_token，这里假设已经通过某种方式（如Jackson, Gson）解析  
        // 这里简单用String.split()模拟解析  
        String[] parts = result.split(",");  
        for (String part : parts) {  
            if (part.contains("access_token")) {  
                String[] tokenParts = part.split(":");  
                return tokenParts[1].trim().replace("\"", "");  
            }  
        }  
        return null;  
    }  
}

import org.apache.http.client.methods.HttpPost;  
import org.apache.http.entity.StringEntity;  
import org.apache.http.message.BasicHeader;  
import org.apache.http.util.EntityUtils;  
public class TemplateMessageSender {  
    public static void sendTemplateMessage(String accessToken, String toUserOpenId, String templateId, String url, Map<String, TemplateData> data) throws Exception {  
        String json = "{\"touser\":\"" + toUserOpenId + "\",\"template_id\":\"" + templateId + "\",\"url\":\"" + url + "\",\"data\":{";  
        for (Map.Entry<String, TemplateData> entry : data.entrySet()) {  
            json += "\"" + entry.getKey() + "\":{\"value\":\"" + entry.getValue().getValue() + "\",\"color\":\"" + entry.getValue().getColor() + "\"},";  
        }  
        if (!json.endsWith(",")) {  
            json = json.substring(0, json.length() - 1);  
        }  
        json += "}}";  
        String messageUrl = "https://api.weixin.qq.com/cgi-bin/message/template/send?access_token=" + accessToken;  
        HttpPost request = new HttpPost(messageUrl);  
        request.setHeader(new BasicHeader("Content-Type", "application/json; charset=UTF-8"));  
        request.setEntity(new StringEntity(json, "UTF-8"));  
        CloseableHttpClient httpClient = HttpClients.createDefault();  
        String result = httpClient.execute(request, httpResponse ->  
                EntityUtils.toString(httpResponse.getEntity()));  
        System.out.println("发送结果: " + result);  
    }  
    static class TemplateData {  
        private String value;  
        private String color;  
        // 构造器、getter和setter省略  
    }  
}

import java.util.HashMap;  
import java.util.Map;  
public class WeChatTemplateMessageExample {  
    public static void main(String[] args) {  
        try {  
            // 获取access_token  
            String accessToken = WeChatUtil.getAccessToken();  
            if (accessToken == null) {  
                System.out.println("获取access_token失败");  
                return;  
            }  
            // 准备模板消息数据  
            Map<String, TemplateMessageSender.TemplateData> data = new HashMap<>();  
            data.put("first", new TemplateMessageSender.TemplateData("这是第一条消息", "#173177"));  
            data.put("keyword1", new TemplateMessageSender.TemplateData("这是关键词1的内容", "#173177"));  
            data.put("keyword2", new TemplateMessageSender.TemplateData("这是关键词2的内容", "#173177"));  
            data.put("remark", new TemplateMessageSender.TemplateData("这是备注信息", "#173177"));  
            // 发送模板消息  
            String toUserOpenId = "用户的OpenID";  
            String templateId = "我们的模板ID";  
            String url = "点击后跳转的链接";  
            TemplateMessageSender.sendTemplateMessage(accessToken, toUserOpenId, templateId, url, data);  
            System.out.println("模板消息发送成功");  
        } catch (Exception e) {  
            e.printStackTrace();  
            System.out.println("发送模板消息失败：" + e.getMessage());  
        }  
    }  
}