JavaWeb之简单的学生信息管理系统（一）

这是一个很简单的学生信息管理系统，会用到很多小知识，比如说：

• 数据库连接池
• DBUtils
• JSP、EL、JSTL
• MVC设计模式

一、需求分析

实现一个简单的学生信息管理系统，具体实现功能有如下：

1. 查询学生的息并列表展示
2. 添加学生信息
3. 删除学生信息
4. 更新（修改）学生信息
5. 模糊查询

二、准备工作

1. 创建数据库stus以及创建数据库表stu

CREATE DATABASE stus;
	USE stus;
	CREATE TABLE stu (
		sid INT PRIMARY KEY  AUTO_INCREMENT,
		sname VARCHAR (20),
		gender VARCHAR (5),
		phone VARCHAR (20),
		birthday DATE,
		hobby VARCHAR(50),
		info VARCHAR(200)
	);

2. 项目框架

3. 导入项目需要的jar包

4. C3P0的配置文件c3p0-config.xml

<c3p0-config>
  <default-config>
    <property name="driverClass">com.mysql.cj.jdbc.Driver</property>
    <property name="jdbcUrl">jdbc:mysql://localhost/stus?useUnicode=true&amp;characterEncoding=utf8&amp;serverTimezone=GMT</property>
    <property name="user">root</property>
    <property name="password">root</property>
    
    <property name="initialPoolSize">10</property>
    <property name="maxIdleTime">30</property>
    <property name="maxPoolSize">100</property>
    <property name="minPoolSize">10</property>
    <property name="maxStatements">200</property>
  </default-config>

</c3p0-config>

三、代码准备

1. 实现Student类

【备：com.domain包下的Student.java】

package com.domain;

import java.util.Date;

/**
 * 这是封装的学生对象Bean
 * @author Administrator
 *
 */
public class Student {
	
	private int sid;
	private String sname;
	private String gender;
	private String phone;
	private String hobby;
	private String info;
	private Date birthday; 
	
	public Student() {
		super();
	}
	
	public Student(String sname, String gender, String phone, String hobby, String info, Date birthday) {
		super();
		this.sname = sname;
		this.gender = gender;
		this.phone = phone;
		this.hobby = hobby;
		this.info = info;
		this.birthday = birthday;	
	}
	
	public int getSid() {
		return sid;
	}
	public void setSid(int sid) {
		this.sid = sid;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	public String getPhone() {
		return phone;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	public String getHobby() {
		return hobby;
	}
	public void setHobby(String hobby) {
		this.hobby = hobby;
	}
	public String getInfo() {
		return info;
	}
	public void setInfo(String info) {
		this.info = info;
	}
	

}

2. 写一个类，判断字符串是否相等【TestUtils.java】

package com.util;

public class TestUtils {
	/**
	 * 判断某一个字符串是否为空
	 * @param s
	 * @return
	 */
	public static boolean isEmpty(String s) {
		return s == null || s.length() == 0;
	}
}

3. JDBCUtils02.java

package com.util;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;


import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class JDBCUtil02 {
	
	static ComboPooledDataSource dataSource = null;
	static{
		dataSource = new ComboPooledDataSource();
	}
	
	public static DataSource getDataSource() {
		return dataSource;
	}
	
	/**
	 * 获得连接对象
	 * @return
	 * @throws SQLException 
	 */
	public static Connection getConn() throws SQLException{
		return dataSource.getConnection();
	}
	
	/**
	 * 释放资源
	 * @param conn
	 * @param st
	 * @param rs
	 */
	public static void release(Connection conn , Statement st , ResultSet rs){
		closeRs(rs);
		closeSt(st);
		closeConn(conn);
	}
	public static void release(Connection conn , Statement st){
		closeSt(st);
		closeConn(conn);
	}

	
	private static void closeRs(ResultSet rs){
		try {
			if(rs != null){
				rs.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			rs = null;
		}
	}
	
	private static void closeSt(Statement st){
		try {
			if(st != null){
				st.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			st = null;
		}
	}
	
	private static void closeConn(Connection conn){
		try {
			if(conn != null){
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			conn = null;
		}
	}
}