为什么这个错误“java.net.SocketException：Connection reset”在运行服务器和客户端时 [英] WHY THIS ERROR "java.net.SocketException: Connection reset" while running sever and client

问题描述

我的srever程序

  package  server_socket; 
  import  java.io. *; 
  import  java.net.ServerSocket; 
  import  java.net.Socket; 
 
 
  class  Server_socket 
 {
  public  静态  void  main（ String  [ ] args） throws  IOException 
 {
  try  
 {
 ServerSocket sk =  new  ServerSocket（ 9999 ）; 
 Socket sock = sk .accept（）; 
 BufferedReader br = new BufferedReader（ new  InputStreamReader（sock.getInputStream（）））; 
  String  temp = br.readLine（）; 
 System.out.println（ 来自客户端的消息是:: + temp） ; 
 PrintStream pr = new PrintStream（sock.getOutputStream（））; 
 字符串 str =  来自服务器的确认 ; 
 pr.println（str）; 
} 
  catch （例外情况）
 {
} 
} 
} 

我的客户计划

  package  client_socket; 
 
  import  java.io. *; 
  import  java.net.Socket; 
  import  java.sql.Connection; 
  import  java.sql.DriverManager; 
  import  java.sql.Statement; 
 
  class  client_socket 
 {
  public   static   void  main（ String  [] args）< span class =code-keyword> throws  IOException 
 {
 Connection c = null; 
语句stmt = null; 
 尝试 
 {
 Socket sock =  new 套接字（  10.176.24.48， 9999 ）; 
 PrintStream pr = new PrintStream（sock.getOutputStream（））; 
 System.out.println（ 输入要发送给服务器的消息）; 
 BufferedReader br = new BufferedReader（ new  InputStreamReader（System.in））; 
  String  temp = br.readLine（）; 
 pr.println（temp）; 
 BufferedReader ed = new BufferedReader（ new  InputStreamReader（sock.getInputStream（）））; 
  String  st = ed.readLine（）; 
 System.out.println（st）; 
 Class.forName（  org.postgresql.Driver）; 
c = DriverManager 
 .getConnection（  jdbc：postgresql：//10.176.24.48：5432 / postgres，
   postgres， ）; 
 
 stmt = c.createStatement（）; 
 字符串 sql =  创建数据库TEST_DB_1编码'UTF8'; 
 stmt.executeUpdate（sql）; 
 stmt.close（）; 
 c.close（）; 
 
} 
  catch （Exception ex）
 {
 System.err.println（ex.getClass） （）。getName（）+  ： + ex.getMessage（））; 
 System.exit（ 0 ）; 
} 
 
 System.out.println（  DBcreated successfully）; 
 
 
 
} 
} 

解决方案

 尝试 {
 []花式代码] 
 
} 
  catch （Exception ex）
 {
 ex.printStackTrace（）;  //  使用此 
} 

这应该可以帮助您查看错误。



大多数情况下，由于防火墙等原因，它是其中一台机器不接受连接

my srever program

package server_socket;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;


class Server_socket
{
       public static void main(String[] args) throws IOException
       {
           try
                {
                ServerSocket  sk = new ServerSocket (9999);
                Socket sock =sk .accept();
                BufferedReader br=new BufferedReader(new InputStreamReader(sock.getInputStream()));
                String temp=br.readLine();
                System.out.println("The mesage from client is::"+temp);
                PrintStream  pr=new PrintStream(sock.getOutputStream()); 
                String  str = "acknowledgement from server";
                pr.println(str);
                }
            catch (Exception ex)
                {
                }
        }
}	

my client program

package client_socket;

import java.io.*;
import java.net.Socket;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

 class client_socket
{
    public static void main(String[] args) throws IOException
    {
        Connection c = null;
        Statement stmt = null;
        try
        {
                    Socket sock = new Socket("10.176.24.48",9999);
                    PrintStream  pr=new PrintStream(sock.getOutputStream()); 
                    System.out.println("enter the message to be send to server");
                    BufferedReader  br=new  BufferedReader(new InputStreamReader(System.in));  
                    String temp = br.readLine();
                    pr.println(temp);	
                    BufferedReader  ed=new  BufferedReader(new InputStreamReader(sock.getInputStream())); 
                    String  st = ed.readLine();
                    System.out.println(st);
                    Class.forName("org.postgresql.Driver");
         c = DriverManager
            .getConnection("jdbc:postgresql://10.176.24.48:5432/postgres",
            "postgres", "");
         
         stmt = c.createStatement();
         String sql = "CREATE DATABASE TEST_DB_1 ENCODING 'UTF8'";
         stmt.executeUpdate(sql);
         stmt.close();
         c.close();
                    
        }
        catch(Exception ex)
        {
        System.err.println(ex.getClass().getName()+": "+ex.getMessage());
         System.exit(0);
      }
     
         System.out.println("DBcreated successfully");             

        
     
    }
}

解决方案

try{
[]fancy code]

}
catch(Exception ex)
{
    ex.printStackTrace(); // use this
}

That should help you to see the error.

Most times it's one of the machines not accepting the connection due to firewall etc.

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