java小程序套接字連接問題

Question

我用於套接字通信的代碼在命令提示符下運行的程序中工作，但是當嵌入在網頁中的小程序使用相同的代碼時存在安全問題。它不連接... 請幫助我，需要在3天內完成這項.... 服務器：

public void run() 
{ 
    try 
    { 
     ServerSocket s1 = new ServerSocket(5555); // create a server socket and bind it to port number. 

     Socket s2 = s1.accept(); // make the server listen for a connection. 

     DataInputStream in = new DataInputStream(s2.getInputStream()); 
     PrintStream out = new PrintStream(s2.getOutputStream()); 
     while(true) 
     { 
      char[] buf = new char[150]; 
      String line = in.readUTF(); // wait for the client to send a line of text. 
      if(line.equals("send")) 
      { 
       for(int i=0;i<150;i++) 
        buf[i]=0; 
       if(Traffic1.s1wiut) buf[0]='1'; 
       if(Traffic1.s1wist) buf[1]='1'; 
       if(Traffic1.s1wirt) buf[2]='1'; 
       if(Traffic1.s1silt) buf[3]='1'; 
       if(Traffic1.s1siut) buf[4]='1'; 
       if(Traffic1.s1sirt) buf[5]='1'; 
      } 
      String line1 = new String(buf); 
      out.println(line1); // send the data to the client. 
      out.flush(); // flush the stream to ensure that the data reaches the other end. 
     } 
    } 

客戶端：

public void run() 
{ 

    while(true) 
    { 
     int serverPort = 5555; // port number on which the server is listening. 

     try 
     { 
      InetAddress ipAddress = InetAddress.getLocalHost(); // create an object that represents the above IP address. 

      Socket socket = new Socket(ipAddress,serverPort); // create a socket with the server's IP address and server's port. 

      DataInputStream in = new DataInputStream(socket.getInputStream()); 
      PrintStream out = new PrintStream(socket.getOutputStream()); 

      while(true) 
      { 
       char[] buf = new char[150]; 
       String line = "send"; // request string to send to server. 
       out.println(line); // send the above line to the server. 
       out.flush(); // flush the stream to ensure that the data reaches the other end. 
       line = in.readUTF(); // wait for the server to send a line of text. 
       buf = line.toCharArray(); 
       if(buf[0]=='1')  s1wiut=true; else s1wiut=false; 
       if(buf[1]=='1')  s1wist=true; else s1wist=false; 
       if(buf[2]=='1')  s1wirt=true; else s1wirt=false; 
       if(buf[3]=='1')  s1silt=true; else s1silt=false; 
       if(buf[4]=='1')  s1siut=true; else s1siut=false; 
       if(buf[5]=='1')  s1sirt=true; else s1sirt=false; 

       repaint(); 
       Thread.sleep(1000); 
      } 
     } 

可以做些什麼來解決這個問題？？

Answer 1

1. 未簽名的小程序只能連接到它從中加載的主機。

2. 你的小程序試圖連接到'本地主機'。所以服務器也必須在本地主機上運行。是嗎？你怎麼安排的？

3. 您正在使用readUTF()來讀取，但是println()來寫。這是行不通的。 println()需要readLine(),readUTF()需要writeUTF()。

Answer 2

你可以發佈你做了什麼樣的錯誤，甚至是與安全相關的問題也

一個小小的建議：

我認爲你需要改變你的服務器代碼如下（因爲服務器總是聽接受客戶套接字）

public void run() 
{ 
    try 
    { 
     ServerSocket s1 = new ServerSocket(5555); // create a server socket and bind it to port number. 

     while(true){ 

     Socket s2 = s1.accept(); // make the server listen for a connection. 

     DataInputStream in = new DataInputStream(s2.getInputStream()); 
     PrintStream out = new PrintStream(s2.getOutputStream()); 
     while(true) 
     { 
      char[] buf = new char[150]; 
      String line = in.readUTF(); // wait for the client to send a line of text. 
      if(line.equals("send")) 
      { 
       for(int i=0;i<150;i++) 
        buf[i]=0; 
       if(Traffic1.s1wiut) buf[0]='1'; 
       if(Traffic1.s1wist) buf[1]='1'; 
       if(Traffic1.s1wirt) buf[2]='1'; 
       if(Traffic1.s1silt) buf[3]='1'; 
       if(Traffic1.s1siut) buf[4]='1'; 
       if(Traffic1.s1sirt) buf[5]='1'; 
      } 
      String line1 = new String(buf); 
      out.println(line1); // send the data to the client. 
      out.flush(); // flush the stream to ensure that the data reaches the other end. 
      } 
     } // end of while 
    } 

和你客戶端會像如下

public void run() 
{ 

    int serverPort = 5555; // port number on which the server is listening. 

    try 
    { 
     InetAddress ipAddress = InetAddress.getLocalHost(); // create an object that represents the above IP address. 

     Socket socket = new Socket(ipAddress,serverPort); // create a socket with the server's IP address and server's port. 

     DataInputStream in = new DataInputStream(socket.getInputStream()); 
     PrintStream out = new PrintStream(socket.getOutputStream()); 

     while(true) 
     { 
      char[] buf = new char[150]; 
      String line = "send"; // request string to send to server. 
      out.println(line); // send the above line to the server. 
      out.flush(); // flush the stream to ensure that the data reaches the other end. 
      line = in.readUTF(); // wait for the server to send a line of text. 
      buf = line.toCharArray(); 
      if(buf[0]=='1')  s1wiut=true; else s1wiut=false; 
      if(buf[1]=='1')  s1wist=true; else s1wist=false; 
      if(buf[2]=='1')  s1wirt=true; else s1wirt=false; 
      if(buf[3]=='1')  s1silt=true; else s1silt=false; 
      if(buf[4]=='1')  s1siut=true; else s1siut=false; 
      if(buf[5]=='1')  s1sirt=true; else s1sirt=false; 

      repaint(); 
      Thread.sleep(1000); 
     } 
    }catch(Exception e){ 
    }