这两天学习了java中处理socket通信过程中粘包的情况，而且很重要，所以，今天添加一点小笔记。

处理粘包程序是客户端的接受消息线程：

客户端：

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(); } } }

服务端：

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(); } } } } } }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。