[英]Sending populated object to server and receiving message back
我试图将填充了学生详细信息的学生对象发送到特定服务器,然后阅读从服务器发送回的消息。
主班:
public class Lab6 {
Socket myClient;
ObjectOutputStream outputStream;
public void socket() {
try {
myClient = new Socket("217.73.66.75", 7879);
}
catch (UnknownHostException e) {
System.out.println(e);
}
catch (IOException e) {
System.out.println(e);
}
}
public void objectWriter() {
try {
myClient = new Socket("217.73.66.75", 7879);
outputStream = new ObjectOutputStream(myClient.getOutputStream());
Student student = new Student(22, "Dave Smith", "130017639", "dave.smith@city.ac.uk");
System.out.println("Student Details:" + student.toString());
outputStream.writeObject(student);
}
catch (UnknownHostException e) {
System.out.println(e);
}
catch (IOException e) {
System.out.println(e);
}
}
/**
*
*/
public void objectReader() {
try {
ObjectInputStream inputStream = new ObjectInputStream(myClient.getInputStream());
Student returnMessage = (Student) inputStream.readObject();
System.out.println("return Message is=" + returnMessage);
myClient.close();
inputStream.close();
}
catch (IOException e) {
System.out.println(e);
}
catch (ClassNotFoundException ex) {
System.out.println("ERR: Cannot perform input. Class not found." + ex);
}
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Lab6 ss;
ss = new Lab6();
ss.socket();
ss.objectWriter();
ss.objectReader();
}
}
学生班:
import java.io.Serializable;
public class Student implements Serializable {
private static final long serialVersionUID = -1848148348931789644L;
private String name;
private int age;
private String studentID;
private String email;
public String gender = "na";
public static int instances = 0;
// Getters
public int getAge(){
return this.age;
}
public String getName(){
return this.name;
}
public String getStudentID(){
return this.studentID;
}
public String getEmail(){
return this.email;
}
// Setters
public void setAge(int age){
this.age = age;
}
public void setName(String name){
this.name = name;
}
public void setStudentID(String studentID){
this.studentID = studentID;
}
public void setEmail(String email){
this.email = email;
}
/**
* Default constructor. Populates age and gender with defaults
*/
public Student(){
this.age = 18;
this.name = "Not Set";
this.studentID = "Not Set";
this.email = "Not Set";
}
/**
* Constructor with parameters
* @param age integer
* @param name String with the name
* @param studentID String with the studentID
* @param email String with the email
*/
public Student (int age, String name, String studentID, String email){
this.age = age;
this.name = name;
this.studentID = studentID;
this.email = email;
}
/**
* Gender constructor
* @param gender
*/
public Student(String gender){
this(); // Must be the first line!
this.gender = gender;
}
protected void finalize() throws Throwable{
//do finalization here
super.finalize(); //not necessary if extending Object.
}
/*************************************************************************
* My Methods:
*
*************************************************************************/
public String toString (){
return "Student ID: " + studentID + "Name: " + this.name + " Age: "
+ this.age + " Gender: " + this.gender + "Email: " + email;
}
}
问题在于它所做的只是在控制台上打印出学生的详细信息,而程序只是说正在运行。 请帮助我找出我做错了什么。
您的代码缺少服务器部分:您的代码两次打开“客户端”套接字; 一次写信; 然后尝试从此类套接字读取内容。
但这不是客户端/服务器的工作方式!
服务器端需要打开一个ServerSocket ; 并等待传入的客户端连接到它。
然后客户端打开与该服务器的套接字连接。 发送数据,服务器获取数据并执行某些操作。
请参阅此处以获取有关该主题的第一个简单教程!
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