在使用mina的过程中，我们通常会自定义各种报文，以使用于自己的业务。今天就为大家带来一款类似http协议的解码过程。 mina有自带的解析http数据包的解码类。可以使用maven配置一下内容获取源码：

        
     
      org.apache.mina
         
     
      mina-http
         
     
      3.0.0-M2
     
    

或者下载mina的源码包，查看org.apache.mina.http.HttpServerDecoder类。下面为自己写的解析方法：

package com.server;import java.lang.reflect.Method;import java.nio.charset.Charset;import org.apache.commons.lang3.StringUtils;import org.apache.log4j.Logger;import org.apache.mina.core.buffer.IoBuffer;import org.apache.mina.core.session.IoSession;import org.apache.mina.filter.codec.CumulativeProtocolDecoder;import org.apache.mina.filter.codec.ProtocolDecoderOutput;import org.apache.mina.filter.codec.textline.LineDelimiter;/** * 解码HTTP协议类 * @author Herman.xiong * @date 2015年7月16日09:36:59 * @version V3.0 * @since Tomcat6.0,Jdk1.6 * @copyright Copyright (c) 2015 */public class HttpServerDecoder extends CumulativeProtocolDecoder {	private static final Logger log = Logger.getLogger(HttpServerDecoder.class);	private LineDelimiter codecLineDelimiter = null;	private Charset charset = null;	private static final String MessageLength = "MessageLength";	public HttpServerDecoder(Charset charset, LineDelimiter codecLineDelimiter) {		this.charset = charset;		this.codecLineDelimiter = codecLineDelimiter;	}	public Charset getCharset() {		return charset;	}	public void setCharset(Charset charset) {		this.charset = charset;	}	public LineDelimiter getCodecLineDelimiter() {		return codecLineDelimiter;	}	public void setCodecLineDelimiter(LineDelimiter codecLineDelimiter) {		this.codecLineDelimiter = codecLineDelimiter;	}		public static void main(String [] args){		IoBuffer buf = IoBuffer.allocate(100).setAutoExpand(true);		Charset charset = Charset.forName("UTF-8");		CharsetEncoder ce=charset.newEncoder();		HttpServerDecoder socket=new HttpServerDecoder(Charset.forName("UTF-8"),LineDelimiter.CRLF);		try{			System.out.println("测试数据，测试数据".getBytes(charset).length);			buf.putString("MessageMethod:UserAction", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);			buf.putString("MessageType:GET", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);			buf.putString("Content-Type:text/html; charset=iso-8859-1", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);			buf.putString("Connection:keep-alive", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);			buf.putString("Keep-Alive:200", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);						buf.putString("CompressType:jzip", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);			buf.putString("Params:id=1&uid=2&name=3", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);			buf.putString("accept-ranges:bytes", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);			buf.putString("DateTime:DateTime", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);			buf.putString("MessageLength:27", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);			//body			buf.putString("测试数据，测试数据", ce);			buf.putString(LineDelimiter.CRLF.getValue(), ce);			buf.flip();			System.out.println("输出的内容为："+buf.getString(charset.newDecoder()));			buf.flip();			socket.doDecode(null,buf,null);		}catch(Exception e){			e.printStackTrace();		}	}			/**	 * 数据包解码	 */	protected boolean doDecode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {		Map
    
      map = (Map
     
      ) session.getAttribute("pocket");		IoBuffer buf = (IoBuffer)session.getAttribute("pocket_state");		if(null ==buf)			buf = IoBuffer.allocate(100).setAutoExpand(true).setAutoShrink(true);		if(null == map)			map = new HashMap
      
       ();		Integer len = 0;		while (in.hasRemaining()) {			len = 0;            byte b = in.get();            switch (b){                case '\r':                    buf.put(b);                    break;                case '\n':                	buf.put(b);                	buf.flip();                    String msg=buf.getString(charset.newDecoder());					String[] arr = msg.split(":");                    if(StringUtils.isEmpty(map.get("MessageLength"))){    					if (2 == arr.length && StringUtils.isNotEmpty(arr[0]) && StringUtils.isNotEmpty(arr[1])) {							map.put(arr[0],arr[1]);    					} else {    						log.error("收到的数据包中存在非法内容!");    					}    					if(Constant.HUPU_ZERO.equals(map.get("MessageLength"))){                        	out.write(map);    						if(in.position()==in.limit()){    							session.setAttribute("pocket_state", null);    							session.setAttribute("pocket",null);    							return true;    						}    						map = new HashMap
       
        ();    					}                    }else{						map.put(StringUtils.isEmpty(map.get("MessageContent"))?msg:map.get("MessageContent")+msg);						len=((null == map.get("MessageContent")) ? StringUtils.EMPTY : String.valueOf(map.get("MessageContent"))).getBytes(charset).length;						if(len==Integer.parseInt(map.get("MessageContent"))+2){							out.write(map);							if(in.position()==in.limit()){								session.setAttribute("pocket_state", null);								session.setAttribute("pocket",null);								return true;							}						}						map = new HashMap
        
         ();					}					buf.clear();                    break;                default:                	buf.put(b);            }        }		if(StringUtils.isEmpty(map.get("MessageLength")) || len
        
       
      
     
    

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