Apache Mina自定义编解码案例
Mina中已经自带的编解码类：
TextLineCodecFactory：基于文本的，根据回车换行来断点传输数据
ProtocolCodecFactory：自定义协议的编解码数据传输
ObjectSerializationCodecFactory：对象序列化传输
DemuxingProtocolCodecFactory：复用传输
自定义通信协议：
FlightSearch 1.0 \n
startcity:BJS \n
endcity:PEK \n
flightway:1 \n
date:2011-08-10 \n
Domain对象
package domain;
/**
* @function :
* @author :jy
* @company :万里网
* @date :2011-8-7
*/
public class Flight {
public String startCity;
public String endCity;
public String flightway;
public String date;
public String fromDate;
public String subclass1;
public String flight1;
/**
* 返回出发城市
* @return
*/
public String getStartCity() {
return startCity;
}
public void setStartCity(String startCity) {
this.startCity = startCity;
}
/**
* 返回到达城市
* @return
*/
public String getEndCity() {
return endCity;
}
public void setEndCity(String endCity) {
this.endCity = endCity;
}
/**
* 返回行程类型
* @return
*/
public String getFlightway() {
return flightway;
}
public void setFlightway(String flightway) {
this.flightway = flightway;
}
/**
* 返回出发日期
* @return
*/
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
@Override
public String toString() {
return "Flight [startCity=" + startCity + ", endCity=" + endCity + ", flightway=" + flightway + ", date="
+ date + "]";
}
/**
* 返回往返日期
* @return
*/
public String getFromDate() {
return fromDate;
}
public void setFromDate(String fromDate) {
this.fromDate = fromDate;
}
public String getFlight1() {
return flight1;
}
public void setFlight1(String flight1) {
this.flight1 = flight1;
}
public String getSubclass1() {
return subclass1;
}
public void setSubclass1(String subclass1) {
this.subclass1 = subclass1;
}
}
服务器端编码
package server;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoderAdapter;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;
/**
* @function :
* @author :jy
* @company :万里网
* @date :2011-8-7
*/
public class FlightEncoder extends ProtocolEncoderAdapter {
private final Charset charset = Charset.forName("UTF-8");
/*
* 服务器端编码无需处理，直接将接收到的数据向下传递
*/
@Override
public void encode(IoSession session, Object message, ProtocolEncoderOutput out) throws Exception {
IoBuffer buf = IoBuffer.allocate(100).setAutoExpand(true);
CharsetEncoder ce = charset.newEncoder();
buf.putString((String)message, ce);
buf.flip();
out.write(buf);
}
}
重点是服务器端解码
package server;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
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.ProtocolDecoderAdapter;
import org.apache.mina.filter.codec.ProtocolDecoderOutput;
import domain.Flight;
/**
* @function :
* @author :jy
* @company :万里网
* @date :2011-8-7
*/
public class FlightDecoder extends CumulativeProtocolDecoder {
@Override
protected boolean doDecode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
IoBuffer buf = IoBuffer.allocate(100).setAutoExpand(true);
CharsetDecoder cd = Charset.forName("UTF-8").newDecoder();
int ColumnNumber = 0;
String status="",startCity="",endCity="",flightway="",date="";
int TextLineNumber = 1;
Flight flight = new Flight();
/**
* FlightSearch 1.0 \n
* startcity:BJS \n
* endcity:PEK \n
* flightway:1 \n
* date:2011-08-10 \n
*/
while(in.hasRemaining()){
byte b = in.get();
buf.put(b);
if(b == 10 && TextLineNumber <= 5){
ColumnNumber++;
if(TextLineNumber == 1){
buf.flip();
status = buf.getString(ColumnNumber, cd);
}
if(TextLineNumber == 2){
buf.flip();
startCity = buf.getString(ColumnNumber, cd).split(":")[1];
startCity = startCity.substring(0, startCity.length()-1);
flight.setStartCity(startCity);
}
if(TextLineNumber == 3){
buf.flip();
endCity = buf.getString(ColumnNumber, cd).split(":")[1];
endCity = endCity.substring(0, endCity.length()-1);
flight.setEndCity(endCity);
}
if(TextLineNumber == 4){
buf.flip();
flightway = buf.getString(ColumnNumber, cd).split(":")[1];
flightway = flightway.substring(0, flightway.length()-1);
flight.setFlightway(flightway);
}
if(TextLineNumber == 5){
buf.flip();
date = buf.getString(ColumnNumber, cd).split(":")[1];
date = date.substring(0, date.length()-1);
flight.setDate(date);
break;
}
ColumnNumber = 0;
buf.clear();
TextLineNumber++;
}else{
ColumnNumber++;
}
}
out.write(flight);
return false;
}
}
服务器端编解码工厂
package server;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolCodecFactory;
import org.apache.mina.filter.codec.ProtocolDecoder;
import org.apache.mina.filter.codec.ProtocolEncoder;
/**
* @function :
* @author :jy
* @company :万里网
* @date :2011-8-7
*/
public class FlightCodecFactory implements ProtocolCodecFactory {
private final ProtocolEncoder encoder = new FlightEncoder();
private final ProtocolDecoder decoder = new FlightDecoder();
@Override
public ProtocolDecoder getDecoder(IoSession session) throws Exception {
return decoder;
}
@Override
public ProtocolEncoder getEncoder(IoSession session) throws Exception {
return encoder;
}
}
下面是客户端的编解码
重点是编码，需要将数据组装成协议格式，发送给服务器
package client;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoderAdapter;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;
import domain.Flight;
/**
* @function :
* @author :jy
* @company :万里网
* @date :2011-8-7
*/
public class FlightClientEncoder extends ProtocolEncoderAdapter {
private final Charset charset;
public FlightClientEncoder(){
this.charset = Charset.forName("UTF-8");
}
@Override
public void encode(IoSession session, Object message, ProtocolEncoderOutput out) throws Exception {
Flight flight = (Flight)message;
IoBuffer buf = IoBuffer.allocate(100).setAutoExpand(true);
CharsetEncoder ce = charset.newEncoder();
buf.putString("Flight Search 1.0" + '\n', ce);
buf.putString("startcty:" + flight.getStartCity() + '\n', ce);
buf.putString("endcity:" + flight.getEndCity() + '\n', ce);
buf.putString("flightway:" + flight.getFlightway() + '\n', ce);
buf.putString("date:" + flight.getDate() + '\n', ce);
buf.flip();
out.write(buf);
}
}
解码无需特殊处理，接收完数据直接向下传递
package client;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
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;
/**
* @function :
* @author :jy
* @company :万里网
* @date :2011-8-7
*/
public class FlightClientDecoder extends CumulativeProtocolDecoder {
/* (non-Javadoc)
* @see org.apache.mina.filter.codec.ProtocolDecoder#decode(org.apache.mina.core.session.IoSession, org.apache.mina.core.buffer.IoBuffer, org.apache.mina.filter.codec.ProtocolDecoderOutput)
*/
@Override
protected boolean doDecode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
CharsetDecoder cd = Charset.forName("UTF-8").newDecoder();
IoBuffer buf = IoBuffer.allocate(100).setAutoExpand(true);
while(in.hasRemaining()){
buf.put(in.get());
}
buf.flip();
out.write(buf.getString(cd));
return false;
}
}
客户端编解码工厂
package client;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolCodecFactory;
import org.apache.mina.filter.codec.ProtocolDecoder;
import org.apache.mina.filter.codec.ProtocolEncoder;
/**
* @function :
* @author :jy
* @company :万里网
* @date :2011-8-7
*/
public class FlightClientCodecFactory implements ProtocolCodecFactory {
private final ProtocolEncoder encoder = new FlightClientEncoder();
private final ProtocolDecoder decoder = new FlightClientDecoder();
/* (non-Javadoc)
* @see org.apache.mina.filter.codec.ProtocolCodecFactory#getDecoder(org.apache.mina.core.session.IoSession)
*/
@Override
public ProtocolDecoder getDecoder(IoSession arg0) throws Exception {
return decoder;
}
/* (non-Javadoc)
* @see org.apache.mina.filter.codec.ProtocolCodecFactory#getEncoder(org.apache.mina.core.session.IoSession)
*/
@Override
public ProtocolEncoder getEncoder(IoSession arg0) throws Exception {
return encoder;
}
}