我编写了一个java套接字编程,其中两个字符串将从客户端提供给服务器。服务器将返回连接的字符串和连接字符串的长度。 目标是在获得所需结果后将“exit”字符串发送到服务器以关闭连接。我得到了所需的结果(服务器发送连接的字符串和大小)但我在服务器端收到错误。
我也在服务器端获得了四份输入的字符串,而不是获得一份副本。
这是输出截图
这是我的服务器端代码:
import java.io.*;
import java.net.*;
public class Provider1{
ServerSocket providerSocket;
Socket connection = null;
ObjectOutputStream out;
ObjectInputStream in;
String message;
String x="";
int count=0;
Provider1(){}
void run()
{
try{
//1. creating a server socket
providerSocket = new ServerSocket(2004, 10);
//2. Wait for connection
System.out.println("Waiting for connection");
connection = providerSocket.accept();
System.out.println("Connection received from " + connection.getInetAddress().getHostName());
//3. get Input and Output streams
out = new ObjectOutputStream(connection.getOutputStream());
out.flush();
in = new ObjectInputStream(connection.getInputStream());
sendMessage("Connection successful");
//4. The two parts communicate via the input and output streams
do{
try{
message="";
message = (String)in.readObject();
System.out.println("client>" + message);
x+=message;
count++;
if(count==2)
{
sendMessage("The concatenated string : "+x);
sendMessage("The length of concatenated string : "+x.length());
message="exit";
}
if (message.equals("exit"))
sendMessage(message);
}
catch(ClassNotFoundException classnot){
System.err.println("Data received in unknown format");
}
}while(!message.equals("exit"));
}
catch(IOException ioException){
ioException.printStackTrace();
}
finally{
//4: Closing connection
try{
in.close();
out.close();
providerSocket.close();
}
catch(IOException ioException){
ioException.printStackTrace();
}
}
}
void sendMessage(String msg)
{
try{
out.writeObject(msg);
out.flush();
}
catch(IOException ioException){
ioException.printStackTrace();
}
}
public static void main(String args[])
{
Provider1 server = new Provider1();
while(true)
{
server.run();
}
}
}
这是我的客户端代码
import java.io.*;
import java.net.*;
public class Requester1{
Socket requestSocket;
ObjectOutputStream out;
ObjectInputStream in;
String message;
Requester1(){}
void run()
{
try{
//1. creating a socket to connect to the server
requestSocket = new Socket("localhost", 2004);
System.out.println("Connected to localhost in port 2004");
//2. get Input and Output streams
out = new ObjectOutputStream(requestSocket.getOutputStream());
out.flush();
in = new ObjectInputStream(requestSocket.getInputStream());
//3: Communicating with the server
do{
try{
message = (String)in.readObject();
System.out.println("server>" + message);
sendMessage("Hello");
sendMessage("There");
message = "exit";
sendMessage(message);
}
catch(ClassNotFoundException classNot){
System.err.println("data received in unknown format");
}
}while(!message.equals("exit"));
}
catch(UnknownHostException unknownHost){
System.err.println("You are trying to connect to an unknown host!");
}
catch(IOException ioException){
ioException.printStackTrace();
}
finally{
//4: Closing connection
try{
in.close();
out.close();
requestSocket.close();
}
catch(IOException ioException){
ioException.printStackTrace();
}
}
}
void sendMessage(String msg)
{
try{
out.writeObject(msg);
out.flush();
//System.out.println("client>" + msg);
}
catch(IOException ioException){
ioException.printStackTrace();
}
}
public static void main(String args[])
{
Requester1 client = new Requester1();
client.run();
}
}
答案 0 :(得分:1)
读取循环继续,直到读取"bye"
,客户端关闭套接字而不发送它。所以这就是发生的事情。
您只需要通过显式捕获EOFException
并在获取读取循环时终止读取循环,使您的阅读代码更加健壮。
您的客户端还需要阅读发送给它的消息。否则,您将激活连接重置。