java - 无法从 Java 服务器应用程序获得响应

Question

下面是一个非常基本的服务器代码。在浏览器中，我输入了类似:localhost:6789/xxxx 的内容。当应用程序运行时，它确实读取了来自客户端的请求，但随后显示消息“无法访问此站点”并且应用程序抛出异常。回应客户的最佳方式是什么？

import java.net.*;
import java.io.*;
import java.net.Socket;

public class URLConnection {
    public static void main(String[] args)throws IOException {
        String clientSentence;
        ServerSocket welcomeSocket = new ServerSocket(6789);

        while (true) {
         Socket connectionSocket = welcomeSocket.accept();
         BufferedReader inFromClient =
          new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
         DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
         clientSentence = inFromClient.readLine();
         System.out.println("Received: " + clientSentence);
         outToClient.writeBytes("HTTP/1.1 200 OK");
        }
    }

}

Answer 1

你必须关闭输出流:

    while (true) {
        Socket connectionSocket = welcomeSocket.accept();
        BufferedReader inFromClient =
                new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
        DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
        clientSentence = inFromClient.readLine();
        System.out.println("Received: " + clientSentence);
        outToClient.writeBytes("HTTP/1.1 200 OK");
        outToClient.close();
    }