BlogJava-lqxue-随笔分类-network

[收藏]RedHat9+Apache2+Resin3 安装指南

lqx — Sat, 13 Oct 2007 13:37:00 GMT

http://www.be10.com/vbb3.0.1/showthread.php?t=1067

lqx 2007-10-13 21:37 发表评论

用udp发送java对象

lqx — Sun, 05 Aug 2007 00:29:00 GMT

在一个java的socket连接中，用ObjectInputStream 和ObjectOutputStream可以很轻松的实现对Object的发送，但是如果没有建立socket连接，如何用udp包来发送Object对象呢？

想想我们用udp发送数据的时候可以发送些什么呢？

DatagramPacket里面可以装些什么呢？ byte[]

对，就是byte[], 那么我们要发送java对象的话就是想办法把一个Object转成byte[],然后再发送到目的地址，然后在接受方把byte转成Object就可以了。
如何把一个Object转化成byte[]呢？我们可以利用ByteArrayOutputStream 这个类
相信到这里，有些朋友已经知道了怎么做了。
还是贴点代码吧！^_^

   public void SendInfo(int code, Object obj){
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      ObjectOutputStream oos = null;
      try{
         oos = new ObjectOutputStream(baos);
         oos.writeInt(code);
         oos.writeObject(obj);
         oos.flush();
         byte arr[] = baos.toByteArray();
         if(arr == null)return;
         SendDataToClient(arr);
         if(baos != null)baos.close();
         if(oos != null)oos.close();
      }catch(Exception e){
         FuncForServer.WriteErrMsg(
         "Exception in Sending data to server.", e);
      }
}
其中SendDataToClient(arr);就不用我说了吧

然后接受方接受到了这个包后呢？
接收到的数组组成对象：
      ByteArrayInputStream bais = new ByteArrayInputStream(dataq);
      ObjectInputStream ois = null;
      byte arr[] = null;
      ois = new ObjectInputStream(bais);
      Object obj ＝ ois.readObject();
obj就到了，呵呵！

lqx 2007-08-05 08:29 发表评论

通过socket传递java对象(对象序列化)

lqx — Wed, 01 Aug 2007 06:08:00 GMT

这篇文章主要实现的是j：通过socket传递Java对象。采用的方法就是对象序列化。方法是：通过socket建立c/s连接；通过ObjectOutputStream，ObjectOutputStream 读写对象。唯一需要留意的是传递的java 对象需要实现Serializable标记接口。代码包括：java对象类，Employee; socket client类；server类。主要代码如下：

java对象类：

import java.io.*;
import java.util.*;

public class Employee implements Serializable {

    private int employeeNumber;

    private String employeeName;

    Employee(int num, String name) {
        employeeNumber = num;
        employeeName = name;
    }

    public int getEmployeeNumber() {
        return employeeNumber;
    }

    public void setEmployeeNumber(int num) {
        employeeNumber = num;
    }

    public String getEmployeeName() {
        return employeeName;
    }

    public void setEmployeeName(String name) {
        employeeName = name;
    }
}

client类：
import java.io.*;
import java.net.*;

public class Client {
    public static void main(String[] arg) {
        try {
            Employee joe = new Employee(150, "Joe");
            System.out.println("employeeNumber= " + joe.getEmployeeNumber());
            System.out.println("employeeName= " + joe.getEmployeeName());
            Socket socketConnection = new Socket("127.0.0.1", 11111);
            ObjectOutputStream clientOutputStream = new ObjectOutputStream(
                    socketConnection.getOutputStream());
            ObjectInputStream clientInputStream = new ObjectInputStream(
                    socketConnection.getInputStream());
            clientOutputStream.writeObject(joe);
            joe = (Employee) clientInputStream.readObject();
            System.out.println("employeeNumber= " + joe.getEmployeeNumber());
            System.out.println("employeeName= " + joe.getEmployeeName());
            clientOutputStream.close();
            clientInputStream.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

Server类：
public class Server {

   public static void main(String[] arg) {

       Employee employee = null;

       try {

           ServerSocket socketConnection = new ServerSocket(11111);

           System.out.println("Server Waiting");

           Socket pipe = socketConnection.accept();

           ObjectInputStream serverInputStream = new ObjectInputStream(pipe
                   .getInputStream());

           ObjectOutputStream serverOutputStream = new ObjectOutputStream(pipe
                   .getOutputStream());

           employee = (Employee) serverInputStream.readObject();

           employee.setEmployeeNumber(256);
           employee.setEmployeeName("John");

           serverOutputStream.writeObject(employee);

           serverInputStream.close();
           serverOutputStream.close();

       } catch (Exception e) {
           System.out.println(e);
       }
   }

}

lqx 2007-08-01 14:08 发表评论