用java写一个邮件发送代码

public boolean mainto()

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{

boolean flag = true;

//建立邮件会话

Properties pro = new Properties();

pro.put("mail.smtp.host","smtp.qq.com");//存储发送邮件的服务器

pro.put("mail.smtp.auth","true"); //通过服务器验证

Session s =Session.getInstance(pro); //根据属性新建一个邮件会话

//s.setDebug(true);

//由邮件会话新建一个消息对象

MimeMessage message = new MimeMessage(s);

//设置邮件

InternetAddress fromAddr = null;

InternetAddress toAddr = null;

try

{

fromAddr = new InternetAddress(451144426+"@qq.com"); //邮件发送地址

message.setFrom(fromAddr); //设置发送地址

toAddr = new InternetAddress("12345367@qq.com"); //邮件接收地址

message.setRecipient(Message.RecipientType.TO, toAddr); //设置接收地址

message.setSubject(title); //设置邮件标题

message.setText(content); //设置邮件正文

message.setSentDate(new Date()); //设置邮件日期

message.saveChanges(); //保存邮件更改信息

Transport transport = s.getTransport("smtp");

transport.connect("smtp.qq.com", "451144426", "密码"); //服务器地址，邮箱账号，邮箱密码

transport.sendMessage(message, message.getAllRecipients()); //发送邮件

transport.close();//关闭

}

catch (Exception e)

{

e.printStackTrace();

flag = false;//发送失败

}

return flag;

}

这是一个javaMail的邮件发送代码，需要一个mail.jar

用JAVA编写购物系统的代码是什么？（急）

算是最简单的吧

package cn.job01;

import java.util.Scanner;

public class Lx07 {

public static void choice() {

System.out.println("登陆菜单 ");

System.out.println("1登陆系统");

System.out.println("2退出");

}

static void choice1() {

System.out.println("购物管理系统客户信息");

System.out.println("1显示所有客户信息");

System.out.println("2添加客户信息");

System.out.println("3修改客户信息");

System.out.println("4查询客户信息");

}

static void choice2() {

System.out.println("购物管理系统真情回馈");

System.out.println("1幸运大放送");

System.out.println("2幸运抽奖");

System.out.println("3生日问候");

}

public static void main(String[] args) {

choice();

Scanner input = new Scanner(System.in);

System.out.println("请输入1or2");

int num = input.nextInt();

switch (num) {

case 1:

System.out.println("主菜单");

System.out.println("1客户信息管理");

System.out.println("2购物结算");

System.out.println("3真情回馈");

System.out.println("4注销");

break;

}

System.out.println("选择输入数字");

int num1 = input.nextInt();

switch (num1) {

case 1:

choice1();

break;

case 2:

System.out.println("购物结算");

break;

case 3:

choice2();

break;

case 4:

choice();

break;

}

}

}

求java编写的仓库管理系统源代码或详细设计

import java.util.*;

import java.awt.event.*;

import java.awt.*;

import javax.swing.*;

import java.io.*;

class 商品 extends Panel

{String 代号,名称;int 库存;float 单价;

商品(String 代号,String 名称,int 库存,float 单价)

{this.代号=代号;this.名称=名称;this.库存=库存;this.单价=单价;

}

}

class ShowWin extends JFrame implements ActionListener

{ Hashtable hashtable=null;

JTextField 代号文本框=new JTextField(),

名称文本框=new JTextField(),

库存文本框=new JTextField(),

单价文本框=new JTextField(),

查询文本框=new JTextField(),

查询信息文本框=new JTextField(),

删除文本框=new JTextField();

JButton b_add=new JButton("添加商品"),

b_del=new JButton("删除商品"),

b_xun=new JButton("查询商品"),

b_xiu=new JButton("修改商品"),

b_show=new JButton("显示商品清单");

JTextArea 显示区=new JTextArea(25,10);

ShowWin()

{super("仓库管理窗口");

hashtable=new Hashtable();

Container con=getContentPane();

JScrollPane pane=new JScrollPane(显示区);

显示区.setEditable(false);

JPanel save=new JPanel();

save.setLayout(new GridLayout(8,2));

save.add(new Label("输入代号:"));

save.add(代号文本框);

save.add(new Label("输入名称:"));

save.add(名称文本框);

save.add(new Label("输入库存:"));

save.add(库存文本框);

save.add(new Label("输入单价:"));

save.add(单价文本框);

save.add(new Label("单击添加:"));

save.add(b_add);

save.add(new Label("单击修改:"));

save.add(b_xiu);

save.add(new Label("输入查询代号:"));

save.add(查询文本框);

save.add(new Label("单击查询:"));

save.add(b_xun);

JPanel del=new JPanel();

del.setLayout(new GridLayout(2,2));

del.add(new Label("输入删除的代号:"));

del.add(删除文本框);

del.add(new Label("单击删除:"));

del.add(b_del);

JPanel show=new JPanel();

show.setLayout(new BorderLayout());

show.add(pane,BorderLayout.CENTER);

show.add(b_show,BorderLayout.SOUTH);

JSplitPane split_one,split_two;

split_one=new JSplitPane(JSplitPane.VERTICAL_SPLIT,save,del);

split_two=new

JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,split_one,show);

con.add(split_two,BorderLayout.CENTER);

JPanel xun=new JPanel();

xun.add(new Label("所得信息:"));

xun.add(查询信息文本框);

xun.setLayout(new GridLayout(2,1));

con.add(xun,BorderLayout.SOUTH);

b_add.addActionListener(this);

b_del.addActionListener(this);

b_xun.addActionListener(this);

b_xiu.addActionListener(this);

b_show.addActionListener(this);

}

public void actionPerformed(ActionEvent e)

{if(e.getSource()==b_add)

{String daihao=null,mingcheng=null;int kucun=0;float danjia=0.0f;

daihao=代号文本框.getText();mingcheng=名称文本框.getText();

kucun=Integer.parseInt(库存文本框.getText());

danjia=Float.valueOf(单价文本框.getText()).floatValue();

商品 goods=new 商品(daihao,mingcheng,kucun,danjia);

hashtable.put(daihao,goods);

try{FileOutputStream file=new FileOutputStream("goods.txt");

ObjectOutputStream out=new ObjectOutputStream(file);

out.writeObject(hashtable); out.close();

}

catch(IOException event){}

}

else if(e.getSource()==b_del)

{String daihao1=删除文本框.getText();

try{FileInputStream come_in=new FileInputStream("goods.txt");

ObjectInputStream in=new ObjectInputStream(come_in);

hashtable=(Hashtable)in.readObject(); //////

in.close();

}

catch(ClassNotFoundException event){}

catch(IOException event){}

商品 temp=(商品)hashtable.get(daihao1);

{hashtable.remove(daihao1);}

try{FileOutputStream file=new FileOutputStream("goods.txt");

ObjectOutputStream out =new ObjectOutputStream(file);

out.writeObject(hashtable);//

out.close();

}

catch(IOException event){}

}

//

else if(e.getSource()==b_xun)

{ String aa;

aa=查询文本框.getText();

查询信息文本框.setText(null);

try{FileInputStream come_in=new FileInputStream("goods.txt");

ObjectInputStream in =new ObjectInputStream(come_in);

hashtable=(Hashtable)in.readObject(); ////

in.close();

}

catch(ClassNotFoundException event){}

catch(IOException event){}

商品 a=(商品)hashtable.get(aa);

查询信息文本框.setText(" 代号："+a.代号+" 名称："+a.名称+" 库存："+a.库存+" 单价："+a.单价);

}

//

else if(e.getSource()==b_xiu)

{ String bb;

bb=代号文本框.getText();

try{FileInputStream come_in=new FileInputStream("goods.txt");

ObjectInputStream in=new ObjectInputStream(come_in);

hashtable=(Hashtable)in.readObject(); //////

in.close();

}

catch(ClassNotFoundException event){}

catch(IOException event){}

商品 temp=(商品)hashtable.get(bb);

{hashtable.remove(bb);}

try{FileOutputStream file=new FileOutputStream("goods.txt");

ObjectOutputStream out =new ObjectOutputStream(file);

out.writeObject(hashtable);//

out.close();

}

catch(IOException event){}

String daihao1=null,mingcheng1=null;int kucun1=0;float danjia1=0.0f;

daihao1=代号文本框.getText();mingcheng1=名称文本框.getText();

kucun1=Integer.parseInt(库存文本框.getText());

danjia1=Float.valueOf(单价文本框.getText()).floatValue();

商品 goods1=new 商品(daihao1,mingcheng1,kucun1,danjia1);

hashtable.put(daihao1,goods1);

try{FileOutputStream file=new FileOutputStream("goods.txt");

ObjectOutputStream out=new ObjectOutputStream(file);

out.writeObject(hashtable); out.close();

}

catch(IOException event){}

}

//

else if(e.getSource()==b_show)

{ 显示区.setText(null);

try{FileInputStream come_in=new FileInputStream("goods.txt");

ObjectInputStream in =new ObjectInputStream(come_in);

hashtable=(Hashtable)in.readObject(); ////

}

catch(ClassNotFoundException event){}

catch(IOException event){}

Enumeration enum=hashtable.elements();

while(enum.hasMoreElements())

{ 商品 te=(商品)enum.nextElement();

显示区.append("商品代号:"+te.代号+" ");

显示区.append("商品名称:"+te.名称+" ");

显示区.append("商品库存:"+te.库存+" ");

显示区.append("商品单价:"+te.单价+" ");

显示区.append("\n ");

}

}

}

}

public class LinkListFour

{public static void main(String args[])

{ ShowWin win=new ShowWin();

win.setSize(400,350);

win.setVisible(true);

win.addWindowListener(new WindowAdapter()

{public void windowClosing(WindowEvent e)

{ System.exit(0);}});

}

}

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