从存储读取文件时出现 EOFException (cn1)

Question

我已经创建了一个可外部化的对象 - 用户。除非我退出应用程序并重新打开它，否则它在从存储中写入和读取它时工作正常。那么就会出现这个错误：

java.io.EOFException 在 java.io.DataInputStream.readFully(DataInputStream.java:197) 在 java.io.DataInputStream.readUTF(DataInputStream.java:609) 在 java.io.DataInputStream.readUTF(DataInputStream.java:564) 在 com.codename1.io.Util.readUTF(Util.java:962)

我在stateMachine中注册了如下类：

@Override
    protected void initVars(Resources res) {
        Util.register("User", User.class);
}

这是课程：

package userclasses;

import com.codename1.io.Externalizable;
import com.codename1.io.Util;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Date;

/**
 *
 * 
 */
public class User implements Externalizable {

    private static final int VERSION = 1;

    public int userID;
    public String username;
    public String password;
    public String firstname;
    public String surname;
    public String email;
    public Date registerDate;
    public boolean paidUser;
    public double runStep;
    public double walkStep;



    public User(){
    }

    @Override
    public int getVersion() {
        return VERSION;

    }

    @Override
    public void externalize(DataOutputStream out) throws IOException {
        out.write(userID);
        Util.writeUTF(username, out);
        Util.writeUTF(password, out);
        Util.writeUTF(firstname, out);
        Util.writeUTF(surname, out);
        Util.writeUTF(email, out);
        out.writeLong(registerDate.getTime());
        out.writeBoolean(paidUser);
        out.writeDouble(runStep);
        out.writeDouble(walkStep);

    }

    @Override
    public void internalize(int version, DataInputStream in) throws      IOException {
        userID = in.readInt();
        username = Util.readUTF(in);
        password = Util.readUTF(in);
        firstname = Util.readUTF(in);
        surname = Util.readUTF(in);
        email = Util.readUTF(in);
        registerDate = new Date(in.readLong());
        paidUser = in.readBoolean();
        runStep = in.readDouble();
        walkStep = in.readDouble();

    }

    @Override
    public String getObjectId() {
        return "User";
    }    
}

Answer 1

替换：

out.write(userID);

与：

out.writeInt(userID);

默认的写入方法相当于writeByte。