計算Java Web客戶端發送和接收的字節數

Question

我有用Java編寫的簡單Web客戶端，我必須計算它發送和接收的字節數。然後我必須將結果與netstat -s命令進行比較。另外，我如何測量我發送和接收的數據包的平均大小。 這裏是WebClient.java：

package javaapplication1; 

/** 
* 
* @author 
*/ 
import java.net.*; 
import java.io.*; 
import java.util.*; 

public class WebClient { 
    public static void main(String[] args) { 
     Scanner scanner = new Scanner(System.in); 
     System.out.print("Enter host name (e.g., www.ouhk.edu.hk): "); 
     String host = scanner.nextLine(); 
     System.out.print("Enter page (e.g., /index.html): "); 
     String page = scanner.nextLine(); 
     final String CRLF = "\r\n"; // newline 
     final int PORT = 80; // default port for HTTP 

     try { 
      Socket socket = new Socket(host, PORT); 
      OutputStream os = socket.getOutputStream(); 
      InputStream is = socket.getInputStream(); 
      PrintWriter writer = new PrintWriter(os); 
      writer.print("GET " + page + " HTTP/1.1" + CRLF); 
      writer.print("Host: " + host + CRLF); 
      writer.print(CRLF); 
      writer.flush(); // flush any buffer 
      BufferedReader reader = new BufferedReader(
        new InputStreamReader(is)); 
      String line; 
      while ((line = reader.readLine()) != null){ 
          System.out.println(line); 

      } 
      System.out.println("Recieved bytes:"); 
      socket.close(); 
     } catch (IOException ex) { 
      ex.printStackTrace(); 
     } 

    } 
} 

Answer 1

你可以創建自己的FilterInputStream和FilterOutputStream實現，將計算穿過的所有數據。然後，只需把它們作爲過濾器，例如：

OutputStream os = new CountingOutpurStream(socket.getOutputStream()); 
    InputStream is = new CountingInputStream(socket.getInputStream());