java服务器源码
1. 求每日定时在服务器的FTP上取数据文件的源码(java)
这个是可以向服务器端发送文字的程序，就是在客户端发送一句hello在服务器也可以接受到hello，这个程序可以修改一下就可以了。具体修改方法是增加一个定时器，然后把字符流改成字节流,现在有点忙，你先研究啊，近两天帮你写写看。
服务器端：
import java.net.*;
import java.io.*;
public class DateServer {
public static void main(String[] args) {
ServerSocket server=null;
try{
server=new ServerSocket(6666);
System.out.println(
"Server start on port 6666...");
while(true){
Socket socket=server.accept();
new SocketHandler(socket).start();
/*
PrintWriter out=new PrintWriter(
new OutputStreamWriter(
socket.getOutputStream()
)
);
out.println(new java.util.Date().toLocaleString());
out.close();
*/
}
}catch(Exception e){
e.printStackTrace();
}finally{
if(server!=null) {
try{
server.close();
}catch(Exception ex){}
}
}
}
}
class SocketHandler extends Thread {
private Socket socket;
public SocketHandler(Socket socket) {
this.socket=socket;
}
public void run() {
try{
PrintWriter out=new PrintWriter(
new OutputStreamWriter(
socket.getOutputStream()
)
);
out.println(
new java.util.Date().
toLocaleString());
out.close();
}catch(Exception e){
e.printStackTrace();
}
}
}
客户端：
package com.briup;
import java.io.*;
import java.net.*;
public class FtpClient {
public static void main(String[] args) {
if(args.length==0) {
System.out.println("Usage:java FtpClient file_path");
System.exit(0);
}
File file=new File(args[0]);
if(!file.exists()||!file.canRead()) {
System.out.println(args[0]+" doesn't exist or can not read.");
System.exit(0);
}
Socket socket=null;
try{
socket=new Socket(args[1],Integer.parseInt(args[2]));
BufferedInputStream in=new BufferedInputStream(
new FileInputStream(file)
);
BufferedOutputStream out=new BufferedOutputStream(
socket.getOutputStream()
);
byte[] buffer=new byte[1024*8];
int i=-1;
while((i=in.read(buffer))!=-1) {
out.write(buffer,0,i);
}
System.out.println(socket.getInetAddress().getHostAddress()+" send file over.");
in.close();
out.close();
}catch(Exception e){
e.printStackTrace();
}finally{
if(socket!=null) {
try{
socket.close();
}catch(Exception ex){}
}
}
}
}
2. Java100行以上源代码，至少五个class以及一个interface，可以简单点
下面是一个可能的Java源代码，它包含了一个接口租冲薯（Shape）和五个类（Circle, Rectangle, Triangle, Square 和 Main）。它的功能是计算不同形状的面积和周长。
//定义一个接口Shape，有两判指个抽象方法：getArea()和getPerimeter()interface Shape { double getArea(); double getPerimeter();
}//定义一个类Circle，实现Shape接口class Circle implements Shape { //定义一个私有属性radius，表示圆的半径
private double radius; //定义一个公有构造方法，用于初始化radius
public Circle(double radius) { this.radius = radius;
} //实现getArea()方法，返回圆的面积
public double getArea() { return Math.PI * radius * radius;
} //实现getPerimeter()方法，返回圆的周长
public double getPerimeter() { return Math.PI * radius * 2;
}
}//定义一个类Rectangle，实现Shape接口class Rectangle implements Shape { //定义两个私有属性width和height，表示矩形的宽度和高度
private double width; private double height; //定义一个公有构造方法，用于初始化width和height
public Rectangle(double width, double height) { this.width = width; this.height = height;
} //实现getArea()方法，返回矩形的面积
public double getArea() { return width * height;
} //实现getPerimeter()方法，返回矩形的周长
public double getPerimeter() { return (width + height) *2;
}
}//定义一个类Triangle，实现Shape接口class Triangle implements Shape { //定义三个私有属性a,b,c表示三角形的三条边长
private double a; private double b; private double c; //定义一个公有构造方法，用于初始化a,b,c，并检查是否满足三角形条件（任意两边之和大于第三边）
public Triangle(double a, double b, double c) throws Exception{ if (a + b > c && a + c > b && b + c > a) {
this.a = a; this.b = b;
this.c = c;
} else {
throw new Exception("Invalid triangle");
}
} //实现getArea()方法，返回三角形的面积（使用海伦公式）
public double getArea() { //计算半周长p
double p = (a + b + c) /2; //计算并返回面积s（使用Math.sqrt()函数求平方根）
return Math.sqrt(p * (p - a) * (p - b) * (p - c));
} //实现getPerimeter()方法，返回三角形的周长
public double getPerimeter(){ return a + b + c;
}
}//定义一个类Square，继承Rectangle类，并重写构造方法和toString()方法class Square extends Rectangle { //重写构造方法，在调用父类构造方法时传入相弊者同的参数side作为width和height
public Square(double side){ super(side, side);
} //重写toString()方法，在原来基础上加上"Square:"前缀，并只显示side属性而不显示width和height属性（使用String.format()函数格式化字符串）
@Override
public String toString(){ return String.format("Square: side=%.2f", super.width); /* 或者直接使用super.getPerimeter()/4作为side */
/* return String.format("Square: side=%.2f", super.getPerimeter()/4); */
/* 注意：不能直接访问super.side属性，
3. 求一个用java socket编写的聊天室程序，能运行的附带源码，有客户端和服务器端
也不知道怎么说怎么用，我写的代码，很久了，用的是awt，感觉Java在应用程序上没前景所以就没在深入了……现在主攻J2ee，代码给你，你自己感觉吧
服务端：
import java.io.*;
import java.net.*;
import java.util.*;
public class ChatServer {
boolean started = false;
ServerSocket ss = null;
List<Client> clients = new ArrayList<Client>();
public static void main(String[] args) {
new ChatServer().start();
}
public void start() {
try {
ss = new ServerSocket(8888);
started = true;
} catch (BindException e) {
System.out.println("端口使用中....");
System.out.println("请关掉相关程序并重新运行服务器！");
System.exit(0);
} catch (IOException e) {
e.printStackTrace();
}
try {
while(started) {
Socket s = ss.accept();
Client c = new Client(s);
System.out.println("a client connected!");
new Thread(c).start();
clients.add(c);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
class Client implements Runnable {
private Socket s;
private DataInputStream dis = null;
private DataOutputStream dos = null;
private boolean bConnected = false;
public Client(Socket s) {
this.s = s;
try {
dis = new DataInputStream(s.getInputStream());
dos = new DataOutputStream(s.getOutputStream());
bConnected = true;
} catch (IOException e) {
e.printStackTrace();
}
}
public void send(String str) {
try {
dos.writeUTF(str);
} catch (IOException e) {
e.printStackTrace();
}
}
public void run() {
try {
while(bConnected) {
String str = dis.readUTF();
System.out.println(str);
for(int i=0; i<clients.size(); i++) {
Client c = clients.get(i);
c.send(str);
}
}
} catch (EOFException e) {
System.out.println("Client closed!");
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(dis != null) dis.close();
if(dos != null) dos.close();
if(s != null) {
s.close();
//s = null;
}
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}
}
客户端，开两个就能聊了……
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
public class ChatClient extends Frame {
Socket s = null;
DataOutputStream dos = null;
DataInputStream dis = null;
private boolean bConnected = false;
TextField tfTxt = new TextField();
TextArea taContent = new TextArea();
Thread tRecv = new Thread(new RecvThread());
public static void main(String[] args) {
new ChatClient().launchFrame();
}
public void launchFrame() {
setLocation(400, 300);
this.setSize(300, 300);
add(tfTxt, BorderLayout.SOUTH);
add(taContent, BorderLayout.NORTH);
pack();
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent arg0) {
disconnect();
System.exit(0);
}
});
tfTxt.addActionListener(new TFListener());
setVisible(true);
connect();
tRecv.start();
}
public void connect() {
try {
s = new Socket("127.0.0.1", 8888);
dos = new DataOutputStream(s.getOutputStream());
dis = new DataInputStream(s.getInputStream());
System.out.println("connected!");
bConnected = true;
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void disconnect() {
try {
dos.close();
dis.close();
s.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private class TFListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
String str = tfTxt.getText().trim();
tfTxt.setText("");
try {
dos.writeUTF(str);
dos.flush();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
private class RecvThread implements Runnable {
public void run() {
try {
while(bConnected) {
String str = dis.readUTF();
taContent.setText(taContent.getText() + str + '\n');
}
} catch (SocketException e) {
System.out.println("�˳��ˣ�bye!");
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
4. java新手,求完整的源代码
//都是从新手过来的，以下代码供参考
//1.
publicclassBankAccount{
privatestaticStringacctnum;
privatestaticdoublemoney;
privatestaticvoidshowAcct(){
System.out.println("账号为:"+acctnum);
}
privatestaticvoidshowMoney(){
System.out.println("余额为:"+money);
}
publicBankAccount(Stringacc,doublem){
this.acctnum=acc;
this.money=m;
}
publicstaticvoidmain(String[]args){
BankAccountba=newBankAccount("626600018888",5000.00);
ba.showAcct();
ba.showMoney();
}
}
//2.
publicclassTriangle{
privatestaticfloata;
privatestaticfloatb;
privatestaticfloatc;
publicTriangle(floata,floatb,floatc){
this.a=a;
this.b=b;
this.c=c;
}
(floata,floatb,floatc){
if((a>Math.abs(b-c)&&a<b+c)
&&(b>Math.abs(a-c)&&b<a+c)
&&(c>Math.abs(a-b)&&c<a+b))
returntrue;
else
returnfalse;
}
publicfloatgetCircumference(){
returnthis.a+this.b+this.c;
}
}//3.
publicclassTestTriangle{
publicstaticvoidmain(String[]args){
Trianglet=newTriangle(5.3f,7.8f,9.3f);
if(t.judgeTriangle(5.3f,7.8f,9.3f)){
System.out.print("能够成三角形，周长为:");
System.out.printf("%9.2f",t.getCircumference());}
else
System.out.println("不能构成三角形");
}
}