Java 发送 POST 请求：详细指南与代码示例

你可以使用 Java 的 HttpURLConnection 类来发送 POST 请求。以下是一个示例代码：

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;

public class PostRequestExample {
    public static void main(String[] args) throws IOException {
        String url = 'http://192.168.50.150:8080/WebClient/getTimerMusicInfoToDirName?dirName=告警';
        String postData = ''; // 如果有POST数据，可以在此处设置

        URL requestUrl = new URL(url);
        HttpURLConnection connection = (HttpURLConnection) requestUrl.openConnection();
        connection.setRequestMethod('POST');
        connection.setDoOutput(true);

        // 设置POST数据，如果有的话
        if (!postData.isEmpty()) {
            byte[] postDataBytes = postData.getBytes(StandardCharsets.UTF_8);
            connection.setRequestProperty('Content-Length', String.valueOf(postDataBytes.length));
            try (DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream())) {
                outputStream.write(postDataBytes);
                outputStream.flush();
            }
        }

        int responseCode = connection.getResponseCode();
        String responseMessage = connection.getResponseMessage();
        System.out.println('Response Code: ' + responseCode);
        System.out.println('Response Message: ' + responseMessage);

        try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
            String line;
            StringBuilder response = new StringBuilder();
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            System.out.println('Response Body: ' + response.toString());
        }

        connection.disconnect();
    }
}

你需要将 url 变量设置为你想要发送 POST 请求的 URL。如果有 POST 数据，你可以将其设置为 postData 变量。注意，POST 数据应该以适当的格式传递，例如 JSON 或表单参数。在发送请求后，你可以通过 connection.getResponseCode() 和 connection.getResponseMessage() 获取响应的状态码和消息。响应的主体内容可以通过读取连接的输入流来获取。