Share example code for handling sticky packets during socket communication in Java

This article mainly introduces the situation of sticky packets in the process of socket communication in java. It has certain reference value. Interested friends can refer to it.

I have learned about processing in java in the past two days. The situation of packet sticking during socket communication is very important, so I will add a few notes today.

The sticky package processing program is the client's message receiving thread:

Client:

import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter; 
import java.io.PrintWriter; 
import java.io.Reader; 
import java.net.Socket; 
import java.nio.CharBuffer; 
 
public class TestSocketClient { 
 
   
  public static void main(String[] args) { 
    // TODO Auto-generated method stub 
     
    new TestSocketClient().start(); 
  } 
  class SendThread extends Thread{ 
    private Socket socket; 
    public SendThread(Socket socket){ 
      this.socket=socket; 
    } 
    @Override 
    public void run(){ 
      while(true){ 
        try{ 
          Thread.sleep(1000);  
          String send="<SOAP-ENV:Envelope>"+System.currentTimeMillis()+"</SOAP-ENV:Envelope>"; 
          PrintWriter pw=new PrintWriter(new OutputStreamWriter(socket.getOutputStream())); 
          pw.write(send); 
          pw.flush(); 
        }catch(Exception e){ 
          e.printStackTrace(); 
        } 
      } 
    } 
  } 
  class ReceiveThread extends Thread{ 
    private Socket socket; 
    private volatile byte[] bytes=new byte[0]; 
    public ReceiveThread(Socket socket){ 
      this.socket=socket; 
    } 
    public byte[] mergebyte(byte[] a,byte[] b,int begin,int end){ 
      byte[] add=new byte[a.length+end-begin]; 
      int i=0; 
      for(i=0;i<a.length;i++){ 
        add[i]=a[i]; 
      } 
      for(int k=begin;k<end;k++,i++){ 
        add[i]=b[k]; 
      } 
      return add; 
    } 
    @Override 
    public void run(){ 
      while(true){ 
        try{ 
          InputStream reader=socket.getInputStream(); 
          if(bytes.length<2){ 
            byte[] head=new byte[2-bytes.length]; 
            int couter=reader.read(head); 
            if(couter<0){ 
              continue; 
            } 
            bytes=mergebyte(bytes,head,0,couter); 
            if(couter<2){ 
              continue; 
            } 
          } 
          //下面这个值请注意，一定要取2长度的字节子数组作为报文长度，你懂得 
          byte[] temp=new byte[0]; 
          temp=mergebyte(temp,bytes,0,2); 
          String templength=new String(temp); 
          int bodylength=Integer.parseInt(templength);       
          if(bytes.length-2<bodylength){ 
            byte[] body=new byte[bodylength+2-bytes.length]; 
            int couter=reader.read(body); 
            if(couter<0){ 
              continue; 
            } 
            bytes=mergebyte(bytes,body,0,couter); 
            if(couter<body.length){ 
              continue; 
            } 
          } 
          byte[] body=new byte[0]; 
          body=mergebyte(body, bytes, 2, bytes.length); 
          System.out.println("client receive body:  "+new String(body)); 
          bytes=new byte[0]; 
        }catch(Exception e){ 
          e.printStackTrace(); 
        } 
      } 
    } 
  } 
  public void start(){ 
    try{ 
    Socket socket=new Socket("127.0.0.1",18889); 
    new SendThread(socket).start(); 
    new ReceiveThread(socket).start(); 
    }catch(Exception e){ 
      e.printStackTrace(); 
    } 
     
  } 
}

Server:

package com.meituan.service.bankgate.gateway; 
 
/** 
 * Created by cqx on 16/7/19. 
 */ 
import java.io.*; 
import java.net.ServerSocket; 
import java.net.Socket; 
import java.nio.CharBuffer; 
import java.util.Date; 
 
public class TESTAHAHHA { 
 
  private final static String SOAP_BEGIN = "<SOAP-ENV:Envelope"; 
  private final static String SOAP_END = "</SOAP-ENV:Envelope>"; 
  public static void main(String[] args) { 
    // TODO Auto-generated method stub 
    TESTAHAHHA testserver=new TESTAHAHHA(); 
    testserver.start(); 
  } 
  public void start(){ 
    try{ 
      ServerSocket serversocket=new ServerSocket(18889); 
      while(true){ 
        Socket socket=serversocket.accept(); 
        new SocketThread(socket).start(); 
      } 
    }catch(Exception e){ 
      e.printStackTrace(); 
    } 
 
  } 
  class SocketThread extends Thread{ 
    private Socket socket; 
    private String temp; 
    public SocketThread(Socket socket){ 
      this.socket=socket; 
    } 
    public Socket getsocket(){ 
      return this.socket; 
    } 
    public void setsocjet(Socket socket){ 
      this.socket=socket; 
    } 
 
    @Override 
    public void run(){ 
      try{ 
        Reader reader=new InputStreamReader(socket.getInputStream()); 
        // Writer writer=new PrintWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF-8")); 
        OutputStream writer=socket.getOutputStream(); 
        CharBuffer charbuffer=CharBuffer.allocate(8192); 
        int readindex=-1; 
        while((readindex=reader.read(charbuffer))!=-1){ 
          charbuffer.flip(); 
          temp+=charbuffer.toString(); 
          if(temp.indexOf(SOAP_BEGIN)!=-1 && temp.indexOf(SOAP_END)!=-1){ 
            //System.out.println(new Date().toLocaleString()+"server:"+temp); 
            temp=""; 
            String str="receive the soap message hahahah"; 
            byte[] headbytes=str.getBytes(); 
            int length=headbytes.length; 
            String l=String.valueOf(length); 
            byte[] lengthbytes=l.getBytes(); 
            byte[] bytes=new byte[length+lengthbytes.length]; 
            int i=0; 
            for(i=0;i<lengthbytes.length;i++){ 
              bytes[i]=lengthbytes[i]; 
            } 
            for(int j=i,k=0;k<length;k++,j++){ 
              bytes[j]=headbytes[k]; 
            } 
            System.out.println("server send:"+new String(bytes)); 
            writer.write(bytes); 
            writer.flush(); 
          }else if(temp.indexOf(SOAP_BEGIN)!=-1){ 
            temp=temp.substring(temp.indexOf(SOAP_BEGIN)); 
          } 
          if(temp.length()>1024*16){ 
            break; 
          } 
        } 
      }catch(Exception e){ 
        e.printStackTrace(); 
      }finally{ 
        if(socket!=null){ 
          try{ 
            if(!socket.isClosed()){ 
              socket.close(); 
            } 
          }catch(Exception e){ 
            e.printStackTrace(); 
          } 
        } 
      } 
    } 
  } 
 
}

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