JAVAME Core technology and best practices_mingjava.rar

				package com.j2medev.chapter5;
				
				import java.io.DataInputStream;
				import java.io.DataOutputStream;
				import java.io.IOException;
				
				public class Message {
				    //定义type的常量
				    public static final int ALL_FRAMES = -1;
				    public static final int SIGNUP = 0;
				    public static final int SIGNUP_ACK = 1;
				    public static final int CLIENT_STATUS = 2;
				    public static final int SERVER_STATUS = 3;
				    public static final int ERROR = 4;
				    public static final int SIGNOFF = 5;
				
				    private int type;//消息类型
				    private int size;//body的大小
				    private int[] body;//body的内容
				
				    public Message(int type) {
				        this.type = type;
				        this.size = 0;
				    }
				
				    public Message(int type, int data) {
				        this.type = type;
				        this.size = 1;
				        body = new int[] {
				            data
				        };
				    }
				    
				    public Message(int type,int[] data){
				        this.type = type;
				        this.size = data.length;
				        this.body = data;
				    }
				
				    public int getType() {
				        return type;
				    }
				
				    public int getSize() {
				        return size;
				    }
				
				    public int[] getBody() {
				        return body;
				    }
				    //发送数据 
				    public void send(DataOutputStream out) throws IOException {
				        out.writeInt(type);
				        out.writeInt(size);
				        for (int i = 0; i < size; i++) {
				            out.writeInt(body[i]);
				        }
				        out.flush();
				    }
				    //解析收到的数据
				    public static Message read(DataInputStream in)
				    throws IOException {
				        Message msg = new Message(in.readInt()); 
				        msg.size = in.readInt();
				        msg.body = new int[msg.getSize()];
				        
				        for (int i = 0; i < msg.getSize(); i++) {
				            msg.body[i] = in.readInt();
				        }
				        return msg;
				    }
				    
				}