JDBC+GUI实现简单学生管理系统

网友投稿 303 2023-01-13


JDBC+GUI实现简单学生管理系统

刚学完JDBC不久,做了一个简单的学生管理系统,可能还有不完善的地方,望各路大神见谅。废话不多说,我先贴个图让大家让大家瞅瞅,觉得是你想要的再看下去吧。

我是以管理者的身份去做的,适合初学者去学习。

在做之前,先捋一遍思路,简单来说分为三大步。

一、在数据库里建Student表存放学生信息

二、用JDBC来连接、操作数据库

三、展示Student数据,实现增删改查功能。

思路是非常简单的,但是要实现还是有很多细节需要注意,下面我就贴上我的代码,结合着代码给大家一步步的分析说明。

实现:

一、在数据库建表:这个不用细说,直接贴图。

二、用JDBC连接数据库:这一块对于刚刚学JDBC的同学来说可能比较绕,所以我把这一块又分成了四部分(最后的db.properties跟com.student.db一起的),我会逐个说明。看图。

(1)com.student.db包里有两个类,一个是DBHelper 一个是DBManager,这俩类是用JDBC连接数据库的,固定写法。

DBManager类

package com.student.db;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import com.student.mapper.IMapper;

public class DBManager {

//这里把JDBC连接数据库的步骤(找驱动,建连接,建通道,执行SQL)封装在DBHelper类里面,在DBManager里用getConnection()调用。这样写的目的是方便

public Connection getConnection(){

try {

return DBHelper.getConnection();//得到DBHelper类里面写好的连接

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}

return null;

}

//增删改结果集。因为sql语句是变化的,所以设为参数比较方便。params是占位符的,没学的可以忽略。

public int executeUpdate(String sql,Object[] params){

Connection conn=null;

PreparedStatement pst=null;

try {

conn=getConnection();//连接

pst=conn.prepareStatement(sql);//通道

if(params != null){//占位符的应用。

for(int i=0;i

pst.setObject(i+1,params[i]);//往通道里放数据,占位符下标从1开始。

}

}

return pst.executeUpdate();

} catch (SQLException e) {

e.printStackTrace();

}

return -1;

}

//查询结果集。比增删改要复杂一些,慢慢看。

//这里的IMapper是将所有可能的用到的类都放进去,方便以后继承使用。(现在我们写的是Student信息,以后可能会有Teacher信息,Class信息等等)

//用接口是因为接口多继承,方便维护升级

public List executeQuery(String sql,IMapper mapper,Object []params){

Connection conn=null;

PreparedStatement pst=null;

ResultSet rst=null;//查询结果集

List list=new ArrayList();//用一个集合存放Student信息

try {

conn=getConnection();

pst=conn.prepareStatement(sql);

if(params != null){

for(int i=0;i

pst.setObject(i+1,params[i]);

}

}

rst=pst.executeQuery();//把通道里的数据放入结果集

list=mapper.map(rst);//IMapper里有个map接口,里面存着结果集数据。把结果集的数据放入list集合

} catch (SQLException e) {

e.printStackTrace();

}

return list;

}

public int count(String sql){//分页查询 count代表页数。

Connection conn=null;

PreparedStatement pst=null;

ResultSet rst=null;

try {

conn=getConnection();

pst=conn.prepareStatement(sql);

rst=pst.executeQuery();

while(rst.next()){

return rst.getInt(1);//sql语句是select count(*) from stu,显示的是count值,就是一行。

}

} catch (SQLException e) {

e.printStackTrace();

}

return -1;

}

}

DBHelper类。在写之前先建一个properties文件,名字为db.properties(如图),注意不要建在包里面。

package com.student.db;

import java.io.IOException;

import java.io.InputStream;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.util.Properties;

public class DBHelper {

private static String DRIVER;

private static String URL;

private static String USER;

private static String PASSWORD;

static{

Properties pro=new Properties();

InputStream in=DBHelper.class.getClassLoader()

.getResourceAsStream("db.properties");//读取文件数据

try {

pro.load(in);

} catch (IOException e) {

e.printStackTrace();

}

DRIVER=pro.getProperty("DRIVER");

URL=pro.getProperty("URL");

USER=pro.getProperty("USER");

PASSWORD=pro.getProperty("PASSWORD");

}

public static Connection getConnection() throws ClassNotFoundException, SQLException{

Class.forName(DRIVER);//找驱动

return DriverManager.getConnection(URL, USER, PASSWORD);//建连接

}

}

(2)com.student.vo包。这里面有一个vo类,我们是要把数据库里的数据放到java里展示,用一个类对象把数据库里的信息一一对应起来就可以很容易的操作。数据库里的一个列对应类对象的一个属性。

package com.student.vo;

public class Student {

private String stuid;

private String name;

private String age;

private String sex;

public String getStuid(){

return stuid;

}

public void setStuid(String stuid){

this.stuid=stuid;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getAge() {

return age;

}

public void setAge(String age) {

this.age = age;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

public Student(String stuid,String name,String sex,String age){

super();

this.stuid=stuid;

this.name=name;

this.age=age;

this.sex=sex;

}

public Student(){

super();

}

}

(3)com.student.mapper包。这里面一个接口,一个实现类。

接口:

package com.student.mapper;

import java.sql.ResultSet;

import java.util.List;

public interface IMapper {

List map(ResultSet rst);//声明一个方法存着结果集。

}

实现类:

package com.student.mapper;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import com.student.vo.Student;

public class StuMapper implements IMapper {//实现接口方法

public List map(ResultSet rst) {

List list=new ArrayList();//建一个集合,里面是Student类里的信息。

try {

while(rst.next()){//

Student stu=new Student();

stu.setStuid(rst.getString("STUID"));//类对象每一个属性对应数据库的每一列。

stu.setName(rst.getString("STUNAME"));

stu.setAge(rst.getString("AGE"));

stu.setSex(rst.getString("SEX"));

list.add(stu);//把类对象放到集合里

}

} catch (SQLException e) {

e.printStackTrace();

}

return list;

}

}

(4)com.student.dao包:这里面的StuDAO类放着增删改查分页等功能

package com.student.dao;

import java.util.List;

import com.student.db.DBManager;

import com.student.mapper.IMapper;

import com.student.mapper.StuMapper;

import com.student.vo.Student;

public class StuDAO {

public List check(){//查看

String sql="select * from STUDENT";//sql语句

DBManager db=new DBManager();

IMapper mapper=new StuMapper();//实现StuMapper

List list=db.executeQuery(sql, mapper,null);//null是指占位符为null,因为查看的是所有信息

return list;

}

public boolean add(Student stu){//添加

String sql="insert into STUDENT values(?,?,?,?)";

Object[] params={stu.getStuid(),stu.getName(),stu.getAge(),stu.getSex()};

DBManager db=new DBManager();

int i=db.executeUpdate(sql, params);

if(i>=0){

System.out.println("成功");

}else{

System.out.println("失败");

}

return true;

}

public boolean update(Student stu){//修改

String sql="update STUDENT set stuname=?,age=?,sex=? where stuid=?";

Object params[]={stu.getName(),stu.getAge(),stu.getSex(),stu.getStuid()};

DBManager db=new DBManager();

int i=db.executeUpdate(sql, params);

if(i>=0){

System.out.println("成功");

}else{

System.out.println("失败");

}

return true;

}

public boolean delete(Student stu){//删除

String sql="delete from STUDENT where stuid=?";

Object params[]={stu.getStuid()};

DBManager db=new DBManager();

int i=db.executeUpdate(sql, params);

if(i>=0){

System.out.println("成功");

}else{

System.out.println("失败");

}

return true;

}

public List findPage(int pagesize,int pagenow){//分页

String sql="select * from (select rownum rn ,stu .* from stu) "

+ "where rownum<=? and rn>?";//分页公式

Object []params={pagesize,(pagenow-1)*pagesize};

DBManager db=new DBManager();

IMapper mapper=new StuMapper();

return db.executeQuery(sql, mapper, params);

}

public int findcount(){

String sql="select count(*) from stu";

DBManager db=new DBManager();

return db.count(sql);

}

}

当把这一块写完之后,其实大部分就已经完成了,JDBC连接数据库基本上是固定的,多写几遍就明白了。

三、展示Student信息,实现增删改查。看图:

(1)com.student.show包,展示界面:这里面内容比较多,但是都很容易理解

package com.student.show;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.List;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

import javax.swing.jscrollPane;

import javax.swing.JTable;

import com.student.add.Add;

import com.student.check.Check;

import com.student.dao.StuDAO;

import com.student.delete.Delete;

import com.student.update.Update;

import com.student.vo.Student;

public class Show extends JFrame {

public static int pagesize=5;//每页显示5条信息

public static int pagenow=1;//当前页为第一页

public Show() {

setSize(500, 430);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);//点X号就是关闭

setResizable(false);//不可改变窗口大小

setLocationRelativeTo(null);//默认居中显示

setLayout(null);//采用坐标布局

StuDAO dao = new StuDAO();//前面我们已经把增删改查分页写到StuDAO里面,现在就直接拿出来用

List list =dao.findPage(pagesize, pagenow);

Student stu = new Student();

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

stu = list.get(i);

}

String[] rowName = { "学号", "姓名", "年龄", "性别" };//从这里开始是二维数组的遍历使用

Object[][] data = new Object[list.size()][4];

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

Student s = list.get(i);

Object st[] = { s.getStuid(), s.getName(), s.getAge(), s.getSex() };

data[i] = st;

}

final JTable table = new JTable(data,rowName);

JScrollPane JSP=new JScrollPane(table);//这一步不能省去,否则显示不出列名

JSP.setBounds(20, 10, 400, 200);

add(JSP);

JButton jb11=new JButton("首页");

jb11.setBounds(40,220,80,30);

add(jb11);

JButton jb22=new JButton("上一页");

jb22.setBounds(130,220,80,30);

add(jb22);

JButton jb33=new JButton("下一页");

jb33.setBounds(220,220,80,30);

add(jb33);

JButton jb44=new JButton("尾页");

jb44.setBounds(310,220,80,30);

add(jb44);

JButton jb1 = new JButton("查看信息");

jb1.setBounds(50, 270, 100, 30);

add(jb1);

JButton jb2 = new JButton("修改信息");

jb2.setBounds(280, 270, 100, 30);

add(jb2);

JButton jb3 = new JButton("添加信息");

jb3.setBounds(50, 320, 100, 30);

add(jb3);

JButton jb4 = new JButton("删除信息");

jb4.setBounds(280, 320, 100, 30);

add(jb4);

JButton jb5 = new JButton("退出");

jb5.setBounds(280, 360, 100, 30);

add(jb5);

jb1.addActionListener(new ActionListener() {//查看

public void actionPerformed(ActionEvent event) {

int row = table.getSelectedRow();//选中第几行

int index = 0;

if(row==-1){

JOptionPane.showMessageDialog(null,"您没有选中信息");

return;

}

String id = (String) table.getValueAt(row, index);// 跟Check联系起来

Check check=new Check(id);

check.setVisible(true);

setVisible(false);

}

});

jb2.addActionListener(new ActionListener() {//修改

public void actionPerformed(ActionEvent event) {

int row = table.getSelectedRow();

int index = 0;

if(row==-1){

JOptionPane.showMessageDialog(null,"您没有选中信息");

return;

}

String id = (String) table.getValueAt(row, index);// 跟Update联系起来

Update up=new Update(id);

up.setVisible(true);

setVisible(false);

}

});

jb3.addActionListener(new ActionListener() {//添加

public void actionPerformed(ActionEvent event) {

Add add = new Add();

add.setVisible(true);

setVisible(false);

}

});

jb4.addActionListener(new ActionListener() {//删除

public void actionPerformed(ActionEvent event) {

int row = table.getSelectedRow();

int index = 0;

if(row==-1){

JOptionPane.showMessageDialog(null,"您没有选中信息");

return;

}

String num=(String) table.getValueAt(row, index);

Delete d=new Delete(num);

d.setVisible(true);

setVisible(false);

}

});

jb11.addActionListener(new ActionListener() {//首页

public void actionPerformed(ActionEvent event) {

pagenow=1;

Show show=new Show();

setVisible(false);

show.setVisible(true);

}

});

jb22.addActionListener(new ActionListener() {//上一页

public void actionPerformed(ActionEvent event) {

if(pagenow != 1){

pagenow=pagenow-1;

}else{

return;

}

Show show=new Show();

setVisible(false);

show.setVisible(true);

}

});

jb33.addActionListener(new ActionListener() {//下一页

public void actionPerformed(ActionEvent event) {

StuDAO dao=new StuDAO();

int count=dao.findcount();

int pageCount=(count-1)/pagesize+1;//pageCount表示最后一页

if(pagenow != pageCount){

pagenow=pagenow+1;

}else{

return;

}

Show show=new Show();

setVisible(false);

show.setVisible(true);

}

});

jb44.addActionListener(new ActionListener() {//尾页

public void actionPerformed(ActionEvent event) {

StuDAO dao=new StuDAO();

int count=dao.findcount();

int pageCount=(count-1)/pagesize+1;

pagenow=pageCount;

Show show=new Show();

setVisible(false);

show.setVisible(true);

}

});

}

public static void main(String args[]) {

Show s = new Show();

}

}

(2)增删改查:大同小异,因为我们在StuDAO里面已经写好了,在用的时候就方便多了。

①添加:

package com.student.add;

import java.sql.SQLException;

import java.util.List;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JTextField;

import com.student.dao.StuDAO;

import com.student.db.DBManager;

import com.student.show.Show;

import com.student.vo.Student;

public class Add extends JFrame{

public Add(){

setSize(300,400);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setResizable(false);

setLocationRelativeTo(null);

setLayout(null);

JLabel j0=new JLabel("添加信息")rUgPINJ;

j0.setBounds(100,20,80,30);

add(j0);

JLabel j1=new JLabel("学号:");

j1.setBounds(30,70,50,30);

add(j1);

final JTextField jt1=new JTextField();

jt1.setBounds(100,70,130,30);

add(jt1);

JLabel j2=new JLabel("姓名:");

j2.setBounds(30,120,50,30);

add(j2);

final JTextField jt2=new JTextField();

jt2.setBounds(100,120,130,30);

add(jt2);

JLabel j3=new JLabel("性别:");

j3.setBounds(30,170,50,30);

add(j3);

final JTextField jt3=new JTextField();

jt3.setBounds(100,170,130,30);

add(jt3);

JLabel j4=new JLabel("年龄:");

j4.setBounds(30,220,50,30);

add(j4);

final JTextField jt4=new JTextField();

jt4.setBounds(100,220,130,30);

add(jt4);

JButton jb1=new JButton("添加");

jb1.setBounds(50,280,80,30);

add(jb1);

JButton jb2=new JButton("返回");

jb2.setBounds(150,280,80,30);

add(jb2);

jb1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent event){

String a=jt1.getText();//获取输入的信息

String b=jt2.getText();

String c=jt3.getText();

String d=jt4.getText();

Student stu=new Student(a,b,c,d);

StuDAO dao=new StuDAO();

List list=dao.check();//调用StuDAO里面的check()方法

for(Student st:list){//遍历集合

if(st.getStuid().equals(a)){

JOptionPane.showMessageDialog(null,"该账号存在");

return;

}

}

dao.add(stu);

JOptionPane.showMessageDialog(null,"添加成功");

Show show=new Show();

show.setVisible(true);

setVisible(false);

}

});

jb2.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent event){

Show s=new Show();

s.setVisible(true);

setVisible(false);

}

});

}

public static void main(String []args){

Add add=new Add();

}

}

②修改:

package com.student.update;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.List;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JTextField;

import com.student.dao.StuDAO;

import com.student.db.DBManager;

import com.student.show.Show;

import com.student.vo.Student;

public class Update extends JFrame{

public Update(final String id){

setSize(300,400);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setResizable(false);

setLocationRelativeTo(null);

setLayout(null);

JLabel j0=new JLabel("修改信息");

j0.setBounds(100,20,80,30);

add(j0);

JLabel j1=new JLabel("学号:");

j1.setBounds(30,70,50,30);

add(j1);

final JLabel jt1=new JLabel();

jt1.setBounds(100,70,130,30);

add(jt1);

JLabel j2=new JLabel("姓名:");

j2.setBounds(30,120,50,30);

add(j2);

final JTextField jt2=new JTextField();

jt2.setBounds(100,120,130,30);

add(jt2);

JLabel j3=new JLabel("年龄:");

j3.setBounds(30,170,50,30);

add(j3);

final JTextField jt3=new JTextField();

jt3.setBounds(100,170,130,30);

add(jt3);

JLabel j4=new JLabel("性别:");

j4.setBounds(30,220,50,30);

add(j4);

final JTextField jt4=new JTextField();

jt4.setBounds(100,220,130,30);

add(jt4);

JButton jb1=new JButton("修改");

jb1.setBounds(50,280,80,30);

add(jb1);

JButton jb2=new JButton("返回");

jb2.setBounds(150,280,80,30);

add(jb2);

StuDAO dao=new StuDAO();

List list=dao.check();

Student stu=new Student();

for(int i=0;i

stu=list.get(i);

if(stu.getStuid().equals(id)){//id是参数,跟前面Show联系起来。

break;

}

}

jt1.setText(stu.getStuid());

jt2.setText(stu.getName());

jt3.setText(stu.getAge());

jt4.setText(stu.getSex());

jb1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent event){

StuDAO dao=new StuDAO();

Student stu=new Student();

stu.setStuid(id);

stu.setName(jt2.getText());

stu.setAge(jt3.getText());

stu.setSex(jt4.getText());

dao.update(stu);//StuDAO里的update()已经写好如何修改,这里直接用

JOptionPane.showMessageDialog(null,"修改成功");

Show show=new Show();

show.setVisible(true);

setVisible(false);

}

});

jb2.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent event){

Show s=new Show();

s.setVisible(true);

setVisible(false);

}

});

}

}

③查看:

package com.student.check;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.List;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;

import com.student.dao.StuDAO;

import com.student.show.Show;

import com.student.vo.Student;

public class Check extends JFrame{

public Check(String id) {

setSize(300,400);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setResizable(false);

setLocationRelativeTo(null);

setLayout(null);

JLabel j0=new JLabel("学生信息");

j0.setBounds(100,20,80,30);

add(j0);

JLabel j1=new JLabel("学号:");

j1.setBounds(30,70,50,30);

add(j1);

final JLabel jt1=new JLabel();

jt1.setBounds(100,70,130,30);

add(jt1);

JLabel j2=new JLabel("姓名:");

j2.setBounds(30,120,50,30);

add(j2);

final JLabel jt2=new JLabel();

jt2.setBounds(100,120,130,30);

add(jt2);

JLabel j3=new JLabel("年龄:");

j3.setBounds(30,170,50,30);

add(j3);

final JLabel jt3=new JLabel();

jt3.setBounds(100,170,130,30);

add(jt3);

JLabel j4=new JLabel("性别:");

j4.setBounds(30,220,50,30);

add(j4);

final JLabel jt4=new JLabel();

jt4.setBounds(100,220,130,30);

add(jt4);

JButton jb1=new JButton("确认");

jb1.setBounds(50,280,80,30);

add(jb1);

JButton jb2=new JButton("返回");

jb2.setBounds(150,280,80,30);

add(jb2);

StuDAO dao=new StuDAO();

List list=dao.check();

Student stu=new Student();

for(int i=0;i

stu=list.get(i);

if(stu.getStuid().equals(id)){

break;

}

}

jt1.setText(stu.getStuid());

jt2.setText(stu.getName());

jt3.setText(stu.getAge());

jt4.setText(stu.getSex());

jb1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent event){

Show s=new Show();

s.setVisible(true);

setVisible(false);

}

});

jb2.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent event){

Show s=new Show();

s.setVisible(true);

setVisible(false);

}

});

}

}

④删除:

package com.student.delete;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.List;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JTextField;

import com.student.dao.StuDAO;

import com.student.db.DBManager;

import com.student.show.Show;

import com.student.vo.Student;

public class Delete extends JFrame{

public Delete(final String num){

setSize(300,400);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setResizable(false);

setLocationRelativeTo(null);

setLayout(null);

JLabel j0=new JLabel("您确认要删除该信息吗");

j0.setBounds(100,20,200,30);

add(j0);

JLabel j1=new JLabel("学号:");

j1.setBounds(30,70,50,30);

add(j1);

final JLabel jt1=new JLabel();

jt1.setBounds(100,70,130,30);

add(jt1);

JLabel j2=new JLabel("姓名:");

j2.setBounds(30,120,50,30);

add(j2);

final JLabel jt2=new JLabel();

jt2.setBounds(100,120,130,30);

add(jt2);

JLabel j3=new JLabel("年龄:");

j3.setBounds(30,170,50,30);

add(j3);

final JLabel jt3=new JLabel();

jt3.setBounds(100,170,130,30);

add(jt3);

JLabel j4=new JLabel("性别:");

j4.setBounds(30,220,50,30);

add(j4);

final JLabel jt4=new JLabel();

jt4.setBounds(100,220,130,30);

add(jt4);

JButton jb1=new JButton("确认");

jb1.setBounds(20,280,80,30);

add(jb1);

JButton jb2=new JButton("返回");

jb2.setBounds(180,280,80,30);

add(jb2);

StuDAO dao=new StuDAO();

List list=dao.check();

Student stu=new Student();

for(int i=0;i

stu=list.get(i);

if(stu.getStuid().equals(num)){

break;

}

}

jt1.setText(stu.getStuid());

jt2.setText(stu.getName());

jt3.setText(stu.getAge());

jt4.setText(stu.getSex());

jb1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent event){

StuDAO dao=new StuDAO();

Student stu=new Student();

stu.setStuid(num);

dao.delete(stu);

JOptionPane.showMessageDialog(null,"删除成功");

Show show=new Show();

show.setVisible(true);

setVisible(false);

}

});

jb2.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent event){

Show s=new Show();

s.setVisible(true);

setVisible(false);

}

});

}

}

最后贴一下登录页面,因为是以管理者的身份登录的不需要判断,就非常简单:

package com.student.login;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

import com.student.show.Show;

public class Login extends JFrame{

public Login(){

setSize(300,250);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setResizable(false);

setLocationRelativeTo(null);

setLayout(null);

JLabel j=new JLabel("登录窗口");

j.setBounds(100,20,80,30);

add(j);

JLabel j1=new JLabel("用户名:");

j1.setBounds(50,80,60,30);

add(j1);

final JTextField jt1=new JTextField();

jt1.setBounds(120,80,120,30);

add(jt1);

JLabel j2=new JLabel("密 码:");

j2.setBounds(50,130,60,30);

add(j2);

final JPasswordField jp=new JPasswordField();

jp.setBounds(120,130,120,30);

add(jp);

JButton jb1=new JButton("登录");

jb1.setBounds(70,180,60,30);

add(jb1);

JButton jb2=new JButton("重置");

jb2.setBounds(170,180,60,30);

add(jb2);

jb1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent event){

String id=jt1.getText();

char ch[]=jp.getPassword();

String pass=new String(ch);

if(id.equals(abcdefj){//设置用户名为abcdefj

if(pass.equals(123456)){//设置密码为123456

JOptionPane.showMessageDialog(null,"登录成功");

Show s=new Show();//成功后跳到Show

s.setVisible(true);

setVisible(false);

}else{

JOptionPane.showMessageDialog(null,"密码错误");

jt1.setText("");

return;

}

}else{

JOptionPane.showMessageDialog(null,"您输入的账号有误");

jt1.setText("");

jp.setText("");

return;

}

}

});

}

public static void main(String []args){

Login lo=new Login();

}

}

写在最后:

刚开始学的时候感觉很绕,尤其是JDBC那,后来发现,是因为前面java基础掌握的不行,我又回去好好复习了java基础,才发现JDBC是死的,固定的写法,背过就行了。所以再做这个学生管理系统,就感觉不复杂了。先有一个大的思路,然后顺着思路往下走,逐步实现每个功能。


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