java Accept", "application/json请求报文

以下是一个Java中发送"Accept", "application/json"请求报文的例子：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;import java.net.URL;

public class HttpExample {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://example.com/api/data");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();            conn.setRequestMethod("GET");
            conn.setRequestProperty("Accept", "application/json");

            if (conn.getResponseCode() != 200) {
                throw new RuntimeException("Failed : HTTP error code : "
                        + conn.getResponseCode());
            }

            BufferedReader br = new BufferedReader(new InputStreamReader(
                    (conn.getInputStream())));

            String output;
            System.out.println("Output from Server .... \n");            while ((output = br.readLine()) != null) {
                System.out.println(output);
            }

            conn.disconnect();

        } catch (Exception e) {

            e.printStackTrace();

        }
    }
}

这个例子中，我们使用了Java中的HttpURLConnection类来发送GET请求，并设置了请求头中的"Accept"为"application/json"。如果服务器返回的状态码不是200，就会抛出一个运行时异常。如果请求成功，我们就可以从服务器返回的输入流中读取响应数据并输出到控制台。