若干个经典Java小程序源代码

一个Java小程序源代码（反转字符串）//BorderLayoutTest.java

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.border.*;

import javax.swing.event.*;

public class test1

{

public static void main(String[] args)

{

cloneFrame frame = new cloneFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.show();

}

}

class cloneFrame extends JFrame

{

public cloneFrame()

{

setTitle("机试程序");

setSize(600, 400);

JPanel buttonPanel = new JPanel();

buttonPanel.setBackground(new Color(56,43,85));

Button1 = new JButton("点击复制反转字符串");

Button1.addActionListener(new turnListener());

buttonPanel.add(Button1);

JPanel textPanel = new JPanel();

textPanel.setBackground(new Color(100,100,100));

field1 = new JTextField("姓名：老孙；学号：2004132028", 20);

field2 = new JTextField("反转", 20);

field2.setEditable(false);

textPanel.add(field1);

textPanel.add(field2);

JPanel tuPanel = new JPanel();

JLabel label = new JLabel(new ImageIcon("006.gif"));

tuPanel.add(label);

tuPanel.setBackground(new Color(100,100,100));

Container contentPane = getContentPane();

contentPane.add(buttonPanel, BorderLayout.SOUTH);

contentPane.add(textPanel, BorderLayout.NORTH);

contentPane.add(tuPanel, BorderLayout.CENTER);

contentPane.setBackground(new Color(100,100,100));

}

private class turnListener

implements ActionListener

{

public void actionPerformed(ActionEvent event)

{

String gets = field1.getText();

int i = gets.length();

StringBuffer buffer = new StringBuffer(i);

for(int j=i-1;j>=0;j--)

{

buffer.append(gets.charAt(j));

}

String gets2 = buffer.toString();

field2.setText(gets2);

}

}

Container contentPane = getContentPane();

contentPane.add(buttonPanel, BorderLayout.SOUTH);

contentPane.add(textPanel, BorderLayout.NORTH);

contentPane.add(tuPanel, BorderLayout.CENTER);

contentPane.setBackground(new Color(100,100,100)); }

private class turnListener

implements ActionListener

{

public void actionPerformed(ActionEvent event)

{

String gets = field1.getText();

int i = gets.length();

StringBuffer buffer = new StringBuffer(i);

for(int j=i-1;j>=0;j--)

{

buffer.append(gets.charAt(j));

}

String gets2 = buffer.toString();

field2.setText(gets2);

}

}

private JButton Button1;

private JTextField field1;

private JTextField field2;

}

Java1

package com.kenki.emp;

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

import java.util.*;

import java.sql.SQLException;

import java.sql.*;

public class emp extends HttpServlet {

private static final String CONTENT_TYPE = "text/html; charset=GBK";

//Initialize global variables

public void init() throws ServletException {

}

//Process the HTTP Get request

public void doGet(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

response.setContentType(CONTENT_TYPE);

PrintWriter out = response.getWriter();

String code = request.getParameter("code");

String name = request.getParameter("name");

String pay = request.getParameter("pay");

System.out.println("empcode:" + code);

System.out.println("name:" + name);

System.out.println("pay:" + pay);

//创建驱动

new com.microsoft.jdbc.sqlserver.SQLServerDriver();

String strd =

"jdbc:microsoft:sqlserver://localhost:1433;databasename=emp_dates"; String username = "sa";

String pws = "";

try {

java.sql.Connection conn = java.sql.DriverManager.getConnection( strd, username, pws);

String strs = "insert into emp values(?,?,?)";

java.sql.PreparedStatement pre = conn.prepareStatement(strs);

pre.setString(1, code);

pre.setString(2, name);

pre.setString(3, pay);

pre.execute();

pre.close();

conn.close();

//重定向至查询页面

out.println("成功保存！！");

response.sendRedirect("emp.html");

} catch (SQLException ss) {

ss.printStackTrace();

response.sendRedirect("/WebModule1/error.html");

}

}

//Process the HTTP Post request

public void doPost(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

doGet(request, response);

}

//Clean up resources

public void destroy() {

}

}

Java2-聊天程序

//这是个聊天程序，在ECLIPSE 运行 Client.java 就可以了。连接是：localhost

//Server 代码，

package message;

import java.io.*;

import http://www.77cn.com.cn.*;

import java.util.*;

public class Server {

public static void main(String[] args) throws Exception{ System.out.print("Server");

ServerSocket socket=new ServerSocket(8888);

Vector v=new Vector();

while(true){

Socket sk=socket.accept();

DataInputStream in=new DataInputStream(sk.getInputStream()); DataOutputStream out=new DataOutputStream(sk.getOutputStream()); v.add(sk);

new ServerThread(in,v).start();

}

}

}

//ServerThread.java 代码

package message;

import http://www.77cn.com.cn.*;

import java.io.*;

import java.util.*;

public class ServerThread extends Thread{

DataInputStream in;

Vector all;

public ServerThread(DataInputStream in,Vector v){

this.in=in;

this.all=v;

}

public void run()

{

while(true)

{

try{

String s1=in.readUTF();

for(int i=0;i<all.size();i++)

{

Object obj=all.get(i);

Socket socket=(Socket)obj;

DataOutputStream out=new DataOutputStream(socket.getOutputStream()); out.writeUTF(s1);

System.out.print(i);

out.flush();

}

System.out.print("Message send over!");

}catch(Exception e){e.printStackTrace();};

}

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