mysql配置: 建立sql庫
root：root
password：root
表名：student
id int
name varchar
age int
MyEclipse項目目錄
database.properties配置
student.java
package mybean;
public class Student {
private String name;
private int age;
private int id;
public Student(){
super();
}
public String getName() {
return name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
studentDao.java
package my.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import com.mysql.jdbc.Statement;
import mybean.Student;
import util.DBInit;
import util.JDBCUtil;
public class StudentDao {
Student student=null;
Connection con=null;
PreparedStatement ps=null;
ResultSet rs=null;
ArrayList<Student> list=new ArrayList<Student>();
//獲取數據庫的所有學生信息
public ArrayList<Student> getAllStudent(){
con=JDBCUtil.getConnection();
try {
String sql="select * from student";
ps=con.prepareStatement(sql);
rs=ps.executeQuery();
while(rs.next()){
student=new Student();
student.setName(rs.getString("name"));
student.setAge(rs.getInt("age"));
student.setId(rs.getInt("id"));
list.add(student);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
JDBCUtil.release(con, ps, rs);
}
return list;
}
//添加學生
public int addstudent(Student student) throws Exception{
con=JDBCUtil.getConnection();
int result=0;
String sql="insert into student(name,age) values(?,?)";
try {
ps = con.prepareStatement(sql);
ps.setString(1, student.getName());
ps.setLong(2, student.getAge());
result=ps.executeUpdate();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
JDBCUtil.release(con, ps, rs);
}
return result;
}
//刪除
public int delete(int id) throws Exception{
con=JDBCUtil.getConnection();
int result=0;
String sql="delete from student where id=?";
try {
ps=con.prepareStatement(sql);
ps.setInt(1, id);
result=ps.executeUpdate();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
JDBCUtil.release(con, ps, rs);
}
return result;
}
//返回一個學生的信息
public ResultSet select(Student student){
con=JDBCUtil.getConnection();
ResultSet rs=null;
String sql="select * from student where id=?";
try {
ps=con.prepareStatement(sql);
ps.setInt(1,student.getId());
// ps.setString(1, student.getName());
// ps.setInt(2, student.getAge());
rs=ps.executeQuery();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
// JDBCUtil.release(con, ps, rs);
}
return rs;
}
//刪除
public int updata(Student student)throws Exception{
con=JDBCUtil.getConnection();
int result=0;
String sql="update student set name=?,age=? where id=?";
try {
ps=con.prepareStatement(sql);
ps.setString(1, student.getName());
ps.setInt(2, student.getAge());
ps.setInt(3, student.getId());
ps.executeUpdate();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
JDBCUtil.release(con, ps, rs);
}
return result;
}
// public static void main(String[] args) {
// StudentDao stu=new StudentDao();
// ArrayList<Student> list1=new ArrayList<Student>();
// list1=stu.getAllStudent();
// for (int i = 0; i < list1.size(); i++) {
// Student s= (Student)list1.get(i);
// System.out.println(s.getName()+" "+s.getAge());
// }
// }
}
DBInit.java
package util;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
public class DBInit {
//獲取database
public static Properties initDB(){
Properties pro=new Properties();
try {
Class c=DBInit.class;
ClassLoader cl=c.getClassLoader();
InputStream in=cl.getResourceAsStream("database.properties");
pro.load(in);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return pro;
}
}
JDBCUtil.java
package util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;
public class JDBCUtil {
//連接數據庫
public static Connection getConnection(){
Properties pro=DBInit.initDB();
String driver=pro.getProperty("driver");
String username=pro.getProperty("userName");
String password=pro.getProperty("password");
String url=pro.getProperty("url");
Connection con=null;
try {
Class.forName(driver);
con=DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return con;
}
//關閉連接
public static void release(Connection con,PreparedStatement ps,ResultSet rs){
try {
if(rs!=null){
rs.close();
}
} catch (Exception e) {
// TODO: handle exception
}
try {
if(ps!=null){
ps.close();
}
} catch (Exception e) {
// TODO: handle exception
}
try {
if(con!=null){
con.close();
}
} catch (Exception e) {
// TODO: handle exception
}
}
}
登錄頁面login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<form method="get" action="doadd.jsp">
<table align=center>
<tr>
<td>name</td>
<td><input type="text" name="name"></td>
</tr>
<tr>
<td>age</td>
<td><input type="text" name="age"></td>
</tr>
<tr>
<td colspan="2" align=center>
<input type="submit" value="提交">
</td>
</tr>
</table>
</form>
</body>
</html>
主頁 Main.jsp
<%@page import="mybean.Student"%>
<%@page import="my.dao.StudentDao"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<jsp:useBean id="studentDao" class="my.dao.StudentDao"></jsp:useBean>
<%
StudentDao stuDao=new StudentDao();
List<Student> list=stuDao.getAllStudent();
int i=1;
%>
<table align=center border="2">
<tr>
<td align=center colspan="4">用戶管理系統</td>
</tr>
<tr>
<td align=center>id</td>
<td align=center>name</td>
<td align=center>age</td>
</tr>
<%for(Student stu:list){%>
<tr align=center>
<td align=center><%=i++ %></td>
<td align=center><%=stu.getName() %></td>
<td align=center><%=stu.getAge() %></td>
<td align="center">
<a href="dodelete.jsp?id=<%=stu.getId()%>" onclick= 'return confirm( "確定要刪除嗎? ")'>刪除</a>
<a href="doupdata.jsp?id=<%=stu.getId()%>">修改</a>
</td>
</tr>
<% }
%>
<a href="login.jsp">增加學生</a>
</table>
</body>
</html>
增加doadd.jsp
<%@page import="my.dao.StudentDao"%>
<%@page import="mybean.Student"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<%
request.setCharacterEncoding("utf-8");
String name=request.getParameter("name");
int age=Integer.parseInt(request.getParameter("age"));
Student student=new Student();
student.setName(name);
student.setAge(age);
StudentDao stuDao=new StudentDao();
int result=stuDao.addstudent(student);
%>
<jsp:forward page="Main.jsp"></jsp:forward>
<body>
</body>
</html>
刪除dodelete.jsp
<%@page import="my.dao.StudentDao"%>
<%@page import="mybean.Student"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
int id=Integer.parseInt(request.getParameter("id"));
StudentDao stuDao=new StudentDao();
int result=stuDao.delete(id);
%>
<jsp:forward page="Main.jsp"></jsp:forward>
</body>
</html>
修改update.jsp
<%@page import="mybean.Student"%>
<%@page import="my.dao.StudentDao"%>
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String name=request.getParameter("name");
int age=Integer.parseInt(request.getParameter("age"));
int id=Integer.parseInt(request.getParameter("id"));
Student student=new Student();
student.setName(request.getParameter("name"));
student.setAge(age);
student.setId(id);
StudentDao stuDao=new StudentDao();
int rs=stuDao.updata(student);
%>
<jsp:forward page="Main.jsp"></jsp:forward>
</body>
</html>
doupdata.jsp
<%@page import="java.sql.ResultSet"%>
<%@page import="mybean.Student"%>
<%@page import="my.dao.StudentDao"%>
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
StudentDao stuDao=new StudentDao();
Student student=new Student();
int id=Integer.parseInt(request.getParameter("id"));
student.setId(id);
ResultSet re=stuDao.select(student);
if(re.next()){%>
<form method="post" action="updata.jsp?id=<%=re.getInt("id")%>">
<table align=center>
<tr>
<td>name</td>
<td><input type="text" value="<%=re.getString("name") %>" name="name"></td>
</tr>
<tr>
<td>age</td>
<td><input type="text" name="age" value="<%=re.getInt("age") %>" ></td>
</tr>
<tr>
<td colspan="2" align=center>
<input type="submit" value="update">
</td>
</tr>
</table>
</form>
<% }%>
</body>
</html>
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