爲什麼從套接字流中讀取塊永遠不變？

Question

我想通過打開TCP套接字來手動執行一些HTTP，發送請求並讀取/打印響應消息。響應主體的內容打印良好，但主線程永遠不會退出並永遠阻止。

socket = new Socket(host, port); 
PrintWriter writer = new PrintWriter(socket.getOutputStream()); 
writer.print(request); 
writer.flush(); 
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); 
reader.lines().forEach(System.out::println); 
// String next_record = null; 
// while ((next_record = reader.readLine()) != null) 
// System.out.println(next_record); 

socket.close(); 
// System.out.println("Finished"); 

我錯過了什麼，我該如何解決？

Answer 1

你確定你正在發送HTTP請求嗎？這對我有用。請注意，「連接：關閉\ r \ n」字符串非常重要，否則在閱讀內容後它也會掛起。

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

public class App { 

    public static void main(String[] args) throws Exception { 
     String host = "google.com"; 
     int port = 80; 
     Socket socket = new Socket(host, port); 

     //BufferedWriter writer = new BufferedWriter(
     //  new OutputStreamWriter(socket.getOutputStream(), "UTF-8")); 
     PrintWriter writer = new PrintWriter(socket.getOutputStream()); 
     writer.write("GET/HTTP/1.1\r\n"); 
     writer.write("Connection: Close\r\n"); 
     writer.write("\r\n"); 
     writer.flush(); 

     BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8")); 

     // reader.lines().forEach(System.out.println); 
     String line; 
     System.out.println("Reading lines:"); 
     while ((line = reader.readLine()) != null) { 
      System.out.println("* " + line); 
     } 
     System.out.println("DONE READING RESPONSE"); 

     reader.close(); 
     writer.close(); 
     // socket.close(); 

     System.out.println("Finished"); 
    } 

}