java查询信息代码下载 java查询系统代码 _import

急求java学生信息管理系统源代码，带有连接数据库的，万分感谢import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JToolBar;
import javax.swing.SwingConstants;
public class MainFrame extends JFrame implements ActionListener{
InsertPanel ip = null;
SelectPanel sp = null;
JPanel pframe;
JButton jb1,jb2,jb3;
JMenuItem jm11,jm21,jm22,jm23,jm31,jm32,jm41,jm42;
CardLayout clayout;
public MainFrame(String s){
super(s);
JMenuBar mb = new JMenuBar();
this.setJMenuBar(mb);
JMenu m1 = new JMenu("系统");
JMenu m2 = new JMenu("基本信息");
JMenu m3 = new JMenu("成绩");
JMenu m4 = new JMenu("奖惩");
mb.add(m1);
mb.add(m2);
mb.add(m3);
mb.add(m4);
jm11 = new JMenuItem("退出系统");
jm21 = new JMenuItem("输入");
jm22 = new JMenuItem("查询");
jm23 = new JMenuItem("更改");
jm31 = new JMenuItem("输入成绩");
jm32 = new JMenuItem("查询成绩");
jm41 = new JMenuItem("奖励");
jm42 = new JMenuItem("处分");
m1.add(jm11);
m2.add(jm21);
m2.add(jm22);
m2.add(jm23);
m3.add(jm31);
m3.add(jm32);
m4.add(jm41);
m4.add(jm42);
Icon i1 = new ImageIcon();
Icon i2 = new ImageIcon();
Icon i3 = new ImageIcon();
jb1 = new JButton(i1);
jb1.setToolTipText("输入");
jb2 = new JButton(i2);
jb2.setToolTipText("查询");
jb3 = new JButton(i3);
jb3.setToolTipText("退出");
JToolBar tb = new JToolBar("系统工具");
tb.add(jb1);
tb.add(jb2);
tb.add(jb3);
add(tb,BorderLayout.NORTH);
jm11.addActionListener(this);
jm21.addActionListener(this);
jm22.addActionListener(this);
jb1.addActionListener(this);
jb2.addActionListener(this);
jb3.addActionListener(this);
clayout = new CardLayout();
pframe = new JPanel(clayout);
add(pframe);
JPanel mainp = new JPanel(new BorderLayout());
JLabel mainl = new JLabel("学生信息管理平台",SwingConstants.CENTER);
mainl.setFont(new Font("serif",Font.BOLD,30));
mainp.add(mainl);
pframe.add(mainp,"main");
clayout.show(pframe, "main");
}
public void actionPerformed(ActionEvent e){
if(e.getSource() == jm21 || e.getSource() == jb1){
if(ip == null){
ip= new InsertPanel();
pframe.add(ip,"insert");
}
clayout.show(pframe, "insert");
this.setTitle("输入学生信息");
}
else if(e.getSource() == jm22 || e.getSource() == jb2){
if(sp == null){
sp= new SelectPanel();
pframe.add(sp,"select");
}
clayout.show(pframe, "select");
this.setTitle("查询学生信息");
}
else if(e.getSource() == jm11 || e.getSource() == jb3){
System.exit(0);
}
}
}
第二个：
import javax.swing.JFrame;
public class MainTest {
public static void main(String [] args){
MainFrame f = new MainFrame("学生信息管理平台");
f.setSize(400,300);
f.setLocation(350,250);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
第二个：
import java.sql.Connection;
import java.sql.DriverManager;
public class MySQLConnection {
static Connection getCon(){
Connection con = null;
try{
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost/test","root","123");
}
catch(Exception e){
System.out.println("建立数据库连接遇到异常！");
}
return con;
}
}
第四个：
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
public class SelectPanel extends JPanel implements ActionListener{
JButton jb;
JTextField jt;
JTextField jt1,jt2,jt3,jt4;
public SelectPanel(){
JLabel jl = new JLabel("请输入学号:",SwingConstants.CENTER);
jt= new JTextField();
jb = new JButton("确定");
JPanel jp1 = new JPanel(new GridLayout(1,3));
jp1.add(jl);
jp1.add(jt);
jp1.add(jb);
JLabel j1,j2,j3,j4;
j1 = new JLabel("学号:",SwingConstants.CENTER);
j2 = new JLabel("姓名:",SwingConstants.CENTER);
j3 = new JLabel("性别:",SwingConstants.CENTER);
j4 = new JLabel("年龄:",SwingConstants.CENTER);
jt1 = new JTextField(6);
jt1.setEditable(false);
jt2 = new JTextField(6);
jt2.setEditable(false);
jt3 = new JTextField(6);
jt3.setEditable(false);
jt4 = new JTextField(6);
jt4.setEditable(false);
JPanel jp2 = new JPanel(new BorderLayout());
JPanel jp3 = new JPanel(new GridLayout(4,2));
jp2.add(new JLabel(""),BorderLayout.NORTH);
jp3.add(j1);
jp3.add(jt1);
jp3.add(j2);
jp3.add(jt2);
jp3.add(j3);
jp3.add(jt3);
jp3.add(j4);
jp3.add(jt4);
jp2.add(jp3);
this.setLayout(new BorderLayout());
add(jp1,BorderLayout.NORTH);
add(jp2);
jb.addActionListener(this);
}
public void actionPerformed(ActionEvent e){
if(e.getSource() == jb){
String stuNo = jt.getText().trim();
Student s = new Student();
boolean b = true;
try{
b = s.selectByStuNo(stuNo);
}
catch(Exception ex){
System.out.println("查询学生信息遇到异常!");
}
if(b){
jt1.setText(s.getStuNo());
jt2.setText(s.getName());
jt3.setText(s.getGender());
int a = s.getAge();
Integer i = new Integer(a);
jt4.setText(i.toString());
}
else{
JOptionPane.showMessageDialog(null, "无此学生!");
}
}
}
}
第五个：
import javax.swing.JFrame;
public class SelectTest {
public static void main(String [] args){
JFrame f = new JFrame("查询学生信息");
SelectPanel p = new SelectPanel();
f.add(p);
f.setSize(400,300);
f.setLocation(300,250);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
第六个：
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
public class Student {
String stuNo;
String name;
String gender;
int age;
public Student(){}
public Student(String stuNo,String name,String gender, int age){
this.stuNo = stuNo;
this.name = name;
this.gender = gender;
this.age = age;
}
public String getStuNo(){
return stuNo;
}
public void setStuNo(String stuNo){
this.stuNo = stuNo;
}
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
public String getGender(){
return gender;
}
public void setGender(String gender){
this.gender = gender;
}
public int getAge(){
return age;
}
public void setAge(int age){
this.age = age;
}
public boolean insertStudent(){
boolean b = true;
try{
Connection con = MySQLConnection.getCon();
Statement statement = con.createStatement();
String sql = "insert into student values('"stuNo"','"name"','"gender"',"age")";
sql = new String(sql.getBytes("gb2312"),"ISO8859_1");
statement.executeUpdate(sql);
con.close();
}
catch(Exception e){
b = false;
System.out.println("插入数据库遇到异常！");
}
return b;
}
public boolean selectByStuNo(String stuNo)throws Exception{
boolean b = true;
Connection con = MySQLConnection.getCon();
Statement statement = con.createStatement();
String sql = "select * from student where stuNo ="stuNo;
ResultSet rs = statement.executeQuery(sql);
if(rs != nullrs.next()){
String no = rs.getString(1);
this.setStuNo(no);
String n = rs.getString(2);
n = new String(n.getBytes("ISO8859_1"),"gb2312");
this.setName(n);
String g = rs.getString(3);
g = new String (g.getBytes("ISO8859_1"),"gb2312");
this.setGender(g);
this.setAge(rs.getInt(4));
b = true;
}
rs.close();
statement.close();
con.close();
return b;
}
}
数据库你自己弄吧，我没时间弄了！初学得多动手哦
按用户ID查询用户信息的java编程代码用户id：1003 用户名：sandy 年龄：15 地址：广州电话：131111111//jdbc？下面是java通过jdbc从数据库查询表格，返回ResultSet 对象的代码
String sql = "select username,password from account";
String user = request.getParameter("user");
String pass = request.getParameter("password");
int j = 0;
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
conn = JDBCTools1.getConnection();
ps = conn.prepareStatement(sql);
rs = ps.executeQuery();
//ResultSet 对象可以使用rs.getString(序列号从一开始);的方法获得查询结果并显示出来
java代码怎样将oracle数据库中数据下载本地，为.txt文件或者.excel文件。第一个类：
package totabel.action;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JOptionPane;
import topdf.TableToPdf;
import totabel.view.TabelData;
import totabel.xls.ExcelDemo;
public class TableAction implements ActionListener {
TabelData data;
public TableAction(TabelData data) {
this.data = https://www.04ip.com/post/data;
}
public void actionPerformed(ActionEvent e) {
String str = e.getActionCommand();
if ("添加".equals(str)) {
data.addData();
} else if ("导出到Excel".equals(str)) {
ExcelDemo demo = new ExcelDemo();
demo.method(data);
} else if ("删除".equals(str)) {
if (data.getRow() != -1) {
data.delRow();
} else {
JOptionPane.showMessageDialog(null, "请选择要删除的行！");
}
}else if("从Excel导入".equals(str)){
data.getXlsInfo();
}else if("从Excel导入到数据库".equals(str)){
data.toDb();
}else if("从table导出到pdf".equals(str)){
TableToPdf pdf=new TableToPdf();
pdf.newPage(data);
}else if("计算学分".equals(str)){
data.getXlsInfoToCredit();
}
}
}
第二个类：数据库连接
package totabel.db;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JdbcConnection {
private static JdbcConnection con;
public static JdbcConnection getCon() {
if (con == null) {
con = new JdbcConnection();
}
return con;
}
public Connection getConnection() {
Connection connection=null;
try {
Class.forName("oracle.jdbc.OracleDriver");
String url = "jdbc:oracle:thin:@127.0.0.1:1521:oracle";
String user = "scott";
String password = "tiger";
connection = DriverManager.getConnection(url, user,
password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}
// public static void main(String[] args) {
//JdbcConnection connection=new JdbcConnection();
//connection.getConnection("asd", "99");
// }
}
第三个类：主类（入口）
package totabel.db;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JdbcConnection {
private static JdbcConnection con;
public static JdbcConnection getCon() {
if (con == null) {
con = new JdbcConnection();
}
return con;
}
public Connection getConnection() {
Connection connection=null;
try {
Class.forName("oracle.jdbc.OracleDriver");
String url = "jdbc:oracle:thin:@127.0.0.1:1521:oracle";
String user = "scott";
String password = "tiger";
connection = DriverManager.getConnection(url, user,
password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}
// public static void main(String[] args) {
//JdbcConnection connection=new JdbcConnection();
//connection.getConnection("asd", "99");
// }
}
第四个类：
package totabel.xls;
import java.io.File;
import java.io.IOException;
import java.util.Vector;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.JOptionPane;
import totabel.view.TabelData;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;
public class ExcelDemo {
/**
*
* @param args
*/
private Vector title = new Vector();
private Vector[] array;
// public static void main(String[] args) {
// ExcelDemo demo = new ExcelDemo();
// demo.getXlsInfo();
//
// }
public void method(TabelData table) {
int row = table.getRowSize();
int column = table.getColumnSize();
WritableWorkbook book = null;
Vector title = table.setTitle();
Object[] str = title.toArray();
try {
book = Workbook.createWorkbook(new File("test.xls"));
WritableSheet sheet = book.createSheet("成绩表", 0);
for (int i = 0; istr.length; i) {
sheet.addCell(new Label(i, 0, (String) str[i]));
}
for (int i = 1; irow1; i) {
for (int j = 1; jcolumn1; j) {
sheet.addCell(new Label(j - 1, i, table.getTableInfo(i - 1,
j - 1)));
}
}
book.write();
JOptionPane.showMessageDialog(null, "导出完成！");
} catch (IOException e) {
e.printStackTrace();
} catch (RowsExceededException e) {
e.printStackTrace();
} catch (WriteException e) {
e.printStackTrace();
} finally {
try {
book.close();
} catch (WriteException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 输出Excel的数据到表单
*
* @return
*/
public Vector getXlsInfo() {
Vector v = new Vector();
jxl.Workbook rwb = null;
int index = 0;
try {
rwb = jxl.Workbook.getWorkbook(new File("test.xls"));
Sheet[] sheet = rwb.getSheets();
for (int i = 0; isheet.length; i) {
int rs = sheet[i].getRows();
array = new Vector[rs - 1];
for (int j = 1; jrs; j) {
Cell[] cell = sheet[i].getRow(j);
Vector info = new Vector();
for (int k = 0; kcell.length; k) {
info.add(cell[k].getContents());
}
array[index] = info;
index;
v.add(info);
}
Cell[] titleCell = sheet[i].getRow(0);
for (int j = 0; jtitleCell.length; j) {
title.add(titleCell[j].getContents());
}
}
} catch (BiffException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
rwb.close();
}
return v;
}
public Vector getXlsInfoToCredit() {
Vector v = new Vector();
jxl.Workbook rwb = null;
try {
rwb = jxl.Workbook.getWorkbook(new File("d:/test/信科0821（南迁）.xls"));
Sheet[] sheet = rwb.getSheets();
for (int i = 0; isheet.length; i) {
int rs = sheet[i].getRows();
array = new Vector[rs - 1];
for (int j = 1; jrs; j) {
Cell[] cell = sheet[i].getRow(j);
Vector info = new Vector();
for (int k = 0; kcell.length; k) {
// if(){
Pattern p = Pattern.compile("[0-9]{1,}");
Matcher m = p.matcher(cell[k].getContents());
if (m.matches()) {
int score = Integer.valueOf(cell[k].getContents());
float result = getScore(score);
info.add(result);
} else {
info.add(cell[k].getContents());
}
}
v.add(info);
}
Cell[] titleCell = sheet[i].getRow(0);
for (int j = 0; jtitleCell.length; j) {
title.add(titleCell[j].getContents());
}
}
} catch (BiffException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
rwb.close();
}
return v;
}
public float getScore(int n) {
float score = n;
if (n60) {
score = 0;
return score;
} else {
if (n = 60n = 63) {
score = (float) 1.0;
} else if (n = 64n = 67) {
score = (float) 1.3;
} else if (n = 68n = 71) {
score = (float) 1.7;
} else if (n = 72n = 75) {
score = (float) 2.0;
} else if (n = 76n = 79) {
score = (float) 2.3;
} else if (n = 80n = 83) {
score = (float) 2.7;
} else if (n = 84n = 87) {
score = (float) 3.0;
} else if (n = 88n = 91) {
score = (float) 3.3;
} else if (n = 92n = 95) {
score = (float) 3.7;
} else if (n = 96n = 100) {
score = (float) 4.0;
}
return score;
}
}
public Vector getTitle() {
// getXlsInfo();
return title;
}
public Vector[] getArray() {
getXlsInfo();
return array;
}
}
因为时间问题就没有再写了，上面是我以前做的，不懂就q我
【java查询信息代码下载 java查询系统代码】java查询信息代码下载的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java查询系统代码、java查询信息代码下载的信息别忘了在本站进行查找喔。

java查询信息代码下载 java查询系统代码

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