在socket傳送過程中，
利用ObjectInputStream及ObjectOutputStream傳接送資料
先定義一個Object，
而Object必需implements java.io.Serializable介面
Serializable可以參考Serializable序列化
DataTest.java |
package test;
public class DataTest implements java.io.Serializable {
private int x = 0 ;
public DataTest()
{
}
public void setP(int x)
{
this.x = x;
}
public int getP()
{
return x;
}
} |
再來建立一個Server，
利用ObjectInputStream的ReadObject()把Object讀進來
再把這個Object做想要的處理
SendServer.java |
package test;
import java.net.ServerSocket;
import java.net.Socket;
public class SendServer extends java.lang.Thread{
private boolean OutServer = false;
private ServerSocket server ;
private final int ServerPort = 8765;
public SendServer()
{
try
{
server = new ServerSocket(ServerPort);
}
catch(java.io.IOException e)
{
System.out.println("Socket啟動有問題 !" );
System.out.println("IOException :" + e.toString());
}
}
public void run()
{
Socket socket ;
java.io.ObjectInputStream in ;
System.out.println("伺服器已啟動 !" );
while(!OutServer)
{
socket = null;
try
{
synchronized(server)
{
socket = server.accept();
}
System.out.println("取得連線 : InetAddress = " +
socket.getInetAddress() );
socket.setSoTimeout(15000);
in = new
java.io.ObjectInputStream(socket.getInputStream());
DataTest data = (DataTest)in.readObject();
System.out.println("我取得的值:"+data.getP());
in.close();
in = null ;
socket.close();
}
catch(java.io.IOException e)
{
System.out.println("Socket連線有問題 !" );
System.out.println("IOException :" + e.toString());
}
catch(java.lang.ClassNotFoundException e)
{
System.out.println("ClassNotFoundException :" +
e.toString());
}
}
}
public static void main(String args[])
{
(new SendServer()).start();
}
} |
| |
最後建立一個socket Client來傳送Object，
利用ObjectOutputStream把Data writeObject()出去
SendClient.java |
package test;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.io.ObjectOutputStream;
public class SendClient {
private String address = "127.0.0.1";
private int port = 8765;
public SendClient()
{
//準備要傳送的資料
DataTest data = new DataTest();
data.setP(102928);
Socket client = new Socket() ;
InetSocketAddress isa = new
InetSocketAddress(this.address,this.port);
try
{
client.connect(isa,10000);
ObjectOutputStream out = new
ObjectOutputStream(client.getOutputStream());
//送出object
out.writeObject(data);
out.flush();
out.close();
out = null ;
data = null ;
client.close();
client = null ;
}
catch(java.io.IOException e)
{
System.out.println("Socket連線有問題 !" );
System.out.println("IOException :" + e.toString());
}
}
public static void main(String args[])
{
new SendClient();
}
} |
-----Server端回應-----
伺服器已啟動 !
取得連線 : InetAddress = /127.0.0.1
我取得的值:102928
原始碼下載
延伸：
Java 1.4可用Serializable類別Object列表
您好!
当我在不同的package建立client和Server的时候，Datatest 也分别在各自的package创建，比如Datatest1.java, Datatest2.java,
其中两个文件里面都是一样的。运行时出现
Server 端：
java.lang.ClassNotFoundException: com.mlh.Datapackage1
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at java.io.ObjectInputStream.resolveClass(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at com.google.facebook.s_new.run(s_new.java:34)
at java.lang.Thread.run(Unknown Source)
Client端：
TCPC: Connecting...
TCP C: Sending...
TCP C: Receiving...
TCP S: Error
java.io.EOFException
at java.io.ObjectInputStream$BlockDataInputStream.peekByte(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at com.mlh.mlh_client.main(mlh_client.java:44)
为什么出现这种错误？
[回應]
yku Replay:
三月 1st, 2010 at 5:14 下午
java.lang.ClassNotFoundException是指你的class讀取不到
請問是否可以提供您的目錄結構呢?
Datapackage1理論上應該要放在./com/mlh月山錄裡的
[回應]