我开始学习Java序列化。我写了一个简单的程序，从客户端程序发送选择和对象。选择是成功通过传递，但是程序在到达writeObject（）方法后立即终止。
请帮助！。 这是客户端：-
import java.io.*;
import java.net.*;
import java.util.Scanner;
public class client implements Serializable
{
/**
*
*/
private static final long serialVersionUID = 1L;
@SuppressWarnings("resource")
public static void main(String args[]) throws IOException, Exception
{
@SuppressWarnings("resource")
Socket s=new Socket("127.0.0.1",9339);
System.out.println("Connection successful");
//to get input from keyboard
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
Scanner sc=new Scanner(System.in);
ObjectOutputStream out = new ObjectOutputStream(s.getOutputStream());
int ch1,ch2;
int choice;
try
{
do
{
System.out.println("Enter your Choice :" );
System.out.println("1.Add Student"+System.lineSeparator()+"2.Show Student");
System.out.println("3.search Student"+System.lineSeparator()+"4.update Student");
System.out.println("5.delete Student"+System.lineSeparator()+"6.Show fail Student");
choice=sc.nextInt();
out.writeInt(choice);
switch(choice)
{
case 1:
{
do
{
student stud=new student();
System.out.println("Enter Roll no. of Student : ");
stud.roll=Integer.parseInt(br.readLine());
System.out.println("Enter name of Student : ");
stud.name=br.readLine();
System.out.println("Enter Percentage : " );
stud.percent=sc.nextFloat();
System.out.println("Enter Attendance : ");
stud.attendance=sc.nextInt();
System.out.println("Enter Password of Student : ");
stud.pass=br.readLine();
out.writeObject(stud);
System.out.println("in Client Object is pass");
System.out.println("Do you want to add more (1.Yes/0.No)");
ch2=sc.nextInt();
}while(ch2==1);
}
break;
case 2:
{
}
break;
case 3:
{
}
break;
case 4:
{
}
break;
case 5:
{
}
break;
case 6:
{
}
break;
default :
System.out.println("Error : Invalid Choice !!");
}
System.out.println("Do you want to Continue (1.Yes/0.No)");
ch1=sc.nextInt();
}while(ch1==1);
}
catch(Exception e)
{
}
}
}
这是服务器端：-
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.*;
public class server implements Serializable
{
/**
*
*/
private static final long serialVersionUID = 1L;
Enumeration <student> stud;
Scanner sc =new Scanner(System.in);
BufferedReader br=new BufferedReader(new
InputStreamReader(System.in));
@SuppressWarnings("unused")
public static Vector <student> arr=new <student> Vector<student>();
public void addStudent(student obj) throws NumberFormatException, IOException
{
System.out.println("Enter Roll no. of Student : ");
obj.roll=Integer.parseInt(br.readLine());
System.out.println("Enter name of Student : ");
obj.name=br.readLine();
System.out.println("Enter Percentage : " );
obj.percent=sc.nextFloat();
System.out.println("Enter Attendance : ");
obj.attendance=sc.nextInt();
System.out.println("Enter Password of Student : ");
obj.pass=br.readLine();
}
public void showAttend(student obj)
{
System.out.println("Attendance : "+obj.attendance);
}
public void showPercent(student obj)
{
System.out.println("Attendance : "+obj.percent);
}
public void showStudent(student obj)
{
System.out.println("Student rollno : "+obj.roll);
System.out.println("Student name : "+obj.name);
System.out.println("Student Percentage : "+obj.percent);
System.out.println("Student Attendance : "+obj.attendance);
}
public void Display() //using itreator
{
Iterator <student> itr= arr.iterator();
while(itr.hasNext())
{
System.out.println(itr.next().toString());
}
}
public void Show_Enumeration()
{
stud=arr.elements();
while(stud.hasMoreElements())
{
System.out.println(stud.nextElement().toString());
}
}
public void fail(student obj)
{
if(obj.percent<35)
{
this.showStudent(obj);
}
}
public void update() throws NumberFormatException, IOException
{
int temp;
System.out.println("Enter rollno of Student to update ");
temp=sc.nextInt();
int index=search(temp);
if(index!=-1)
{
arr.remove(index);
System.out.println("Ente new updated Data : ");
student obj=new student();
arr.add(obj);
}
}
public void delete()
{
int temp;
System.out.println("Enter rollno of Student to delete ");
temp=sc.nextInt();
int index=search(temp);
if(index!=-1)
{
arr.remove(index);
System.out.println("Student deleted succesfully: ");
}
}
public <T> int search(T temp)
{
int flag=0,index=-1;
Integer r;
String n;
if(temp instanceof Integer)
{
r=(Integer)temp;
for(student obj: arr)
{
if(obj.roll==r)
{
flag=1;
index=arr.indexOf(obj);
break;
}
}
if(flag==1)
{
System.out.println("Record found Succefull ! ");
return index;
}
else
{
System.out.println("Record not found !");
return -1;
}
}
if(temp instanceof String)
{
n=(String) temp;
for(student obj: arr)
{
if(obj.name.equalsIgnoreCase(n))
{
flag=1;
index=arr.indexOf(obj);
break;
}
}
if(flag==1)
{
System.out.println("Record found Succefull ! ");
return index;
}
else
{
System.out.println("Record not found !");
return -1;
}
}
return 0;
}
public static void main(String args[]) throws IOException
{
ServerSocket ss=new ServerSocket(9339);
Socket s=ss.accept();
// to read from keyboard
Scanner sc=new Scanner(System.in);
new BufferedReader(new InputStreamReader (System.in));
ObjectInputStream in=new ObjectInputStream(s.getInputStream());
int choice;
server t=new server();
try
{
choice=in.readInt();
System.out.println("Choice in techer is"+choice);
switch(choice)
{
case 1:
{
student stud;
stud=(student)in.readObject();
arr.add(stud);
}
break;
case 2:
{
t.Display();// using iterator
//t.Show_Enumeration(); // using enumeration
}
/*case 2:
{
for(Studentinfo obj : teacharinfo.arr)
{
t.showStudent(obj);
}
}*/
break;
case 3:
{
int index,cc;
System.out.println("Enter your choice : ");
System.out.println("1.Search by roll no."+System.lineSeparator()+"2.Search by Name");
cc=sc.nextInt();
if(cc==1)
{
System.out.println("Enter roll no. : ");
int temp=sc.nextInt();
index=t.search(temp);
}
else
{
System.out.println("Enter name : ");
String temp=sc.next();
index=t.search(temp);
}
student obj=new student();
obj=arr.get(index);
t.showStudent(obj);
}
break;
case 4:
{
t.update();
}
break;
case 5:
{
t.delete();
}
break;
case 6:
{
System.out.println("Fail Student : ");
for(student obj:arr)
{
t.fail(obj);
}
}
break;
}
}
catch(Exception e)
{
}
ss.close();
s.close();
sc.close();
}
}
学生班级定义：-
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.Serializable;
import java.util.Scanner;
public class student implements Serializable
{
/**
*
*/
private static final long serialVersionUID = 1L;
public int roll;
public String name;
public int attendance;
public float percent;
public String pass;
BufferedReader br=new BufferedReader( new
InputStreamReader(System.in));
Scanner sc=new Scanner(System.in);
public String toString()
{
return "Student rollno : "+this.roll+System.lineSeparator()+"Student name : "+this.name+System.lineSeparator()+"Student Percentage : "+this.percent+System.lineSeparator()+"Student Attendance : "+this.attendance;
}
}