老师，下午好！我跟着老师的代码敲了，爆出了如下的错误，用老师的代码执行也是产生了同样的错误！
"C:\Program Files\Java\jdk-13.0.2\bin\java.exe" "-javaagent:D:\software\IDEA\IntelliJ IDEA 2020.1\lib\idea_rt.jar=53021:D:\software\IDEA\IntelliJ IDEA 2020.1\bin" -Dfile.encoding=UTF-8 -classpath D:\baizhan\Server\out\production\Server Server
===================服务器端已开启========================
Exception in thread "main" java.lang.ClassNotFoundException: com.bjsxt.net.User
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:416)
at java.base/java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:727)
at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1941)
at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1827)
at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2115)
at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1646)
at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:464)
at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
at Server.main(Server.java:16)
Process finished with exit code 1
=====================================================================
idea版本：2020
java版本：13.02
服务器端代码：
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class Server {
public static void main(String[] args) throws IOException, ClassNotFoundException {
System.out.println("===================服务器端已开启========================");
//(1)创建ServverSocket对象
ServerSocket server = new ServerSocket(10000);
Socket socket = server.accept();
//(2)获取输入流 （对象流）
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
User user = (User) ois.readObject();
String str = null;
//(3)对用户名和密码进行验证
if ("bjsxt".equals(user.getUserName())&&"bjsxt".equals(user.getPassword())) {
str = "登录成功！";
System.out.println(str);
}else {
str ="对不起，账户或者密码错误";
}
//(4)把验证结果发回去给客户端，获取输出流
DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
dos.writeUTF(str);
//(5)关闭流
if (dos != null) {
dos.close();
}
if (ois != null) {
ois.close();
}
if (socket != null) {
socket.close();
}
}
}
User对象代码：
import java.io.Serializable;
public class User implements Serializable {
private static final long serialVersionUID = -5940762109009983290L;
private String userName;
private String password;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public User(String userName, String password) {
this.userName = userName;
this.password = password;
}
public User() {
}
}===================================================================
客户端代码：
package com.bjsxt.net;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.net.Socket;
public class Client {
public static void main(String[] args) throws IOException {
//(1)创建Soket对象
Socket client = new Socket("127.0.0.1",10000);
//(2)获取输出流（对象流） 需要对字节流惊醒包装
ObjectOutputStream oos=new ObjectOutputStream(client.getOutputStream());
//(3)创建User对象
User user = new User("bjsxt","bjsxt");
//(4)User对象发送到服务器
oos.writeObject(user);//将user对象发送到服务器，在发送的时候进行类型转换 转成object类型
//(5)获取输入流（数据流） 用于接收服务器端的相应结果
DataInputStream dis = new DataInputStream(client.getInputStream());
System.out.println(dis.readUTF());
//(6)关闭流
if (dis != null) {
dis.close();
}
if (oos != null) {
oos.close();
}
if (client != null) {
client.close();
}
}
}
User代码：
package com.bjsxt.net;
import java.io.Serializable;
public class User implements Serializable {
private static final long serialVersionUID = -5940762109009983290L;
private String userName;
private String password;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public User(String userName, String password) {
this.userName = userName;
this.password = password;
}
public User() {
}
}
不知道是不是版本的问题，编码的时候都没报错，客户端一运行，然后输入账号密码就报错！麻烦老师帮我看一下！
老师开头不是说因为容器中没有a的key所有打印null，之后在出现key“a”时候覆盖了A；那么key(b)也没有再容器中出现，打印出来不也应该是null吗？后面的key为什么都是对应的value？
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