求解序列化问题

以下程序运行时出现如下错误，求解
错误信息如下：
java.io.NotSerializableException: ch04.LogModel
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at java.util.ArrayList.writeObject(ArrayList.java:570)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1461)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at ch04.LogFileOperate.writeLogFile(LogFileOperate.java:54)
at ch04.Cilent.main(Cilent.java:25)
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: ch04.LogModel
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1333)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at java.util.ArrayList.readObject(ArrayList.java:593)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at ch04.LogFileOperate.readLogFile(LogFileOperate.java:32)
at ch04.Cilent.main(Cilent.java:27)
Caused by: java.io.NotSerializableException: ch04.LogModel
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at java.util.ArrayList.writeObject(ArrayList.java:570)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1461)readlog====null

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at ch04.LogFileOperate.writeLogFile(LogFileOperate.java:54)
at ch04.Cilent.main(Cilent.java:25)



源代码如下：

package ch04;

public class LogModel {
	private String logId;
	
	private String operateUser;
	
	private String operateTime;
	
	private String logContent;

	public String getLogId() {
		return logId;
	}

	public void setLogId(String logId) {
		this.logId = logId;
	}

	public String getOperateUser() {
		return operateUser;
	}

	public void setOperateUser(String operateUser) {
		this.operateUser = operateUser;
	}

	public String getOperateTime() {
		return operateTime;
	}

	public void setOperateTime(String operateTime) {
		this.operateTime = operateTime;
	}

	public String getLogContent() {
		return logContent;
	}

	public void setLogContent(String logContent) {
		this.logContent = logContent;
	}
	@Override
	public String toString() {
		return "logID="+logId+",operateUser="+operateUser+",operateTime="+operateTime+",logContent="+logContent;
	}
	
}

package ch04;

import java.util.List;

public interface LogFileOperateApi {
	public List<LogModel> readLogFile();
	
	public void writeLogFile(List<LogModel> list);
}

package ch04;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.List;

public class LogFileOperate implements LogFileOperateApi {

	private String logFilePathName = "AdapterLog.log";
	
	public LogFileOperate(String logFilePathName){
		if(logFilePathName!=null&&logFilePathName.trim().length()>0){
			this.logFilePathName = logFilePathName;
		}
	}
	@Override
	public List<LogModel> readLogFile() {
		// TODO Auto-generated method stub
		List<LogModel> list = null;
		ObjectInputStream oin = null;
		try{
			File f = new File(logFilePathName);
			if(f.exists()){
				oin = new ObjectInputStream(new BufferedInputStream(new FileInputStream(f)));
			}
			list = (List<LogModel>) oin.readObject();
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			try{
				if(oin!=null){
					oin.close();
				}
			}catch(IOException e){
				e.printStackTrace();
			}
		}
		return list;
	}

	@Override
	public void writeLogFile(List<LogModel> list) {
		// TODO Auto-generated method stub
		File f = new File(logFilePathName);
		ObjectOutputStream oout = null;
		try{
			oout= new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(f)));
			oout.writeObject(list);
		}catch(IOException e){
			e.printStackTrace();
		}finally{
			try{
				oout.close();
			}catch(IOException e){
				e.printStackTrace();
			}
				
		}
	}

}

package ch04;

import java.util.ArrayList;
import java.util.List;

public class Cilent {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		LogModel lml = new LogModel();
		
		lml.setLogId("0000000000001");
		lml.setOperateUser("admin");
		lml.setOperateTime("2011-7-9 11:47:25");
		lml.setLogContent("这仅仅是一个测试");
		
		List<LogModel> list = new ArrayList<LogModel>();
		list.add(lml);
		
		LogFileOperateApi api = new LogFileOperate("F:\\WorkSpaces\\shejimoshi\\AdapterLog.log");
		
		api.writeLogFile(list);
		
		List<LogModel> readLog  = api.readLogFile();
		
		System.out.println("readlog===="+readLog);
	}

}