此案例是基於JavaEE、mysql技術的學生資訊管理系統。
為了先對案例有個清楚的認識，這裡先貼上執行結果截圖：
1、索引頁面，進入系統。

2、主頁面：

3、點選新增：

4、刪除李琦琦一欄：

5、修改馬衍碩：

一、對資料庫的封裝：

在資料庫庫部分，通過Java程式碼對資料庫操作進行封裝，其中涉及到很多技術和技巧，請持續關注我的部落格，後續會有詳細介紹。

對資料庫的封裝程式碼：
（1）這裡是定義資料庫操作元素的結構，操作元素有三個屬性，即deptno、dname、loc，分別對應學生資訊的學號、姓名、家庭住址。

Dept.java

package com.neusoft.dao;

//實體類
public class Dept {
private int deptno;//
private String dname;//
private String loc;//
private String value1;//
private String value2;//
public int getDeptno() {
	return deptno;
}
public void setDeptno(int deptno) {
	this.deptno = deptno;
}
public String getDname() {
	return dname;
}
public void setDname(String dname) {
	this.dname = dname;
}
public String getLoc() {
	return loc;
}
public void setLoc(String loc) {
	this.loc = loc;
}
public String getValue1() {
	return value1;
}
public void setValue1(String value1) {
	this.value1 = value1;
}
public String getValue2() {
	return value2;
}
public void setValue2(String value2) {
	this.value2 = value2;
}



}

 

（2）連線資料庫：

DeUtils.java

package com.neusoft.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DbUtils {
private DbUtils(){}
private static final String url="jdbc:mysql://localhost:3306/smartstyle";;
private static final  String user="root";
private static  final String password="857289";
static
{
	//1.建立驅動類物件
	//new oracle.jdbc.driver.OracleDriver();
	try {
		//Class.forName("oracle.jdbc.driver.OracleDriver");
		Class.forName("com.mysql.jdbc.Driver");
	} catch (ClassNotFoundException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	}
public static  Connection getConnection()
{
	Connection conn=null;	
	try {
		conn=DriverManager.getConnection(url, user, password);
		System.out.println("Ok");
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	return conn;
	}
public static void closeConnection(Connection conn)
{
	try {
		if(conn!=null)
		{
		conn.close();
		}
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	}
public static void closePreparedStatement(PreparedStatement pstmt)
{
	try {
		if(pstmt!=null)
		{
		pstmt.close();
		}
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	}
public static void closeResultSet(ResultSet rs)
{
	//4.關閉資料庫
			try {
				if(rs!=null)
				{
				rs.close();
				}
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
	}


public static void beginTransaction(Connection conn) {
	try {
		conn.setAutoCommit(false);
	} catch (SQLException ex) {
		ex.printStackTrace();
	}
}

public static void commit(Connection conn) {
	try {
		conn.commit();
		conn.setAutoCommit(true);
	} catch (SQLException ex) {
		ex.printStackTrace();
	}
}

public static void rollback(Connection conn) {
	try {
		conn.rollback();
		conn.setAutoCommit(true);
	} catch (SQLException ex) {
		ex.printStackTrace();
	}
}
public static void main(String[] ars)
{
	 getConnection();
	}
}

 

（3）對資料庫操作的封裝：
這裡的介面定義了對資料庫操作的方法：
DeptDao.java

package com.neusoft.dao;

import java.util.List;


public interface DeptDao {
void insertDept(Dept dept);
void updateDept(Dept dept);
void deleteDept(int deptno);
List<Dept>  getDepts();
Dept getDeptByDeptno(int deptno);

}

這裡實現了對資料庫操作的封裝：
在建立資料庫連線的基礎上，通過向資料庫傳送要執行的SQL語句，達到操作資料庫的目的。

DeptDaoImpl.java

package com.neusoft.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;


public class DeptDaoImpl implements DeptDao {

	@Override
	public void insertDept(Dept dept) {
		// TODO Auto-generated method stub
		Connection conn=null;
		PreparedStatement pstmt=null;
				try {
					conn=DbUtils.getConnection();
					//3.操作資料庫					
					String sql="insert into dept(deptno,dname,loc) values(?,?,?)";					
					pstmt=conn.prepareStatement(sql);
					pstmt.setInt(1, dept.getDeptno());
					pstmt.setString(2, dept.getDname());
					pstmt.setString(3,dept.getLoc());
					
					pstmt.executeUpdate();
					
				}  catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}finally
				{
			
				//4.關閉資料庫		
					DbUtils.closePreparedStatement(pstmt);
					DbUtils.closeConnection(conn);
				}
			
				
	}

	@Override
	public void updateDept(Dept dept) {
		// TODO Auto-generated method stub
Connection conn=null;
PreparedStatement pstmt=null;


try {
	conn=DbUtils.getConnection();
	String sql="update dept set dname=?,loc=? where deptno=?";
	pstmt=conn.prepareStatement(sql);
	pstmt.setString(1, dept.getDname());
	pstmt.setString(2, dept.getLoc());
	pstmt.setInt(3, dept.getDeptno());
	
	pstmt.executeUpdate();
	
} catch (SQLException e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
}finally
{
	//4.關閉資料庫		
	DbUtils.closePreparedStatement(pstmt);
	DbUtils.closeConnection(conn);
	}

	}

	@Override
	public void deleteDept(int deptno) {
		// TODO Auto-generated method stub
		Connection conn=null;
		PreparedStatement pstmt=null;
		
		try {
			conn=DbUtils.getConnection();
			String sql="delete from dept where deptno=?";
			pstmt=conn.prepareStatement(sql);
			pstmt.setInt(1, deptno);
			
			pstmt.executeUpdate();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally
		{
			//4.關閉資料庫		
			DbUtils.closePreparedStatement(pstmt);
			DbUtils.closeConnection(conn);
		}
		
	}

	@Override
	public List<Dept> getDepts() {
		Connection conn=null;
		PreparedStatement pstmt=null;
		ResultSet rs=null;
		List<Dept>  depts=new ArrayList<Dept>();
		try {
			conn=DbUtils.getConnection();
			//3.操作資料庫			
			String sql="select * from dept";			
			pstmt=conn.prepareStatement(sql);
			
			rs=pstmt.executeQuery();
			
			while(rs.next())
			{
				Dept dept=new Dept();
				dept.setDeptno(rs.getInt("DEPTNO"));//
				dept.setDname(rs.getString("DNAME"));
				dept.setLoc(rs.getString("LOC"));
				depts.add(dept);
				
			}
			
		}catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally
		{
	    DbUtils.closeResultSet(rs);
		DbUtils.closePreparedStatement(pstmt);
		DbUtils.closeConnection(conn);
		
		}
		return depts;
	}

	@Override
	public Dept getDeptByDeptno(int deptno) {
		Connection conn=null;
		PreparedStatement pstmt=null;
		ResultSet rs=null;
		Dept  dept=new Dept();
		try {
			conn=DbUtils.getConnection();
			//3.操作資料庫			
			String sql="select * from dept where deptno=?";			
			pstmt=conn.prepareStatement(sql);
			pstmt.setInt(1, deptno);
			rs=pstmt.executeQuery();
			
			if(rs.next())
			{
				dept.setDeptno(rs.getInt("DEPTNO"));
				dept.setDname(rs.getString("DNAME"));
				dept.setLoc(rs.getString("LOC"));
			}
			
			
		}catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally
		{
	    DbUtils.closeResultSet(rs);
		DbUtils.closePreparedStatement(pstmt);
		DbUtils.closeConnection(conn);
		
		}
		return dept;
	}

}

（4）為了程式碼的簡潔，再封裝：
DeptService.java

package com.neusoft.service;

import java.util.List;

import com.neusoft.dao.Dept;

public interface DeptService {
	void insertDept(Dept dept);
	void updateDept(Dept dept);
	void deleteDept(int deptno);
	List<Dept>  getDepts();
	Dept getDeptByDeptno(int deptno);
}

DeptServiceImpl.java

package com.neusoft.service;

import java.util.List;

import com.neusoft.dao.Dept;
import com.neusoft.dao.DeptDao;
import com.neusoft.dao.DeptDaoImpl;

public class DeptServiceImpl implements DeptService {

	@Override
	public void insertDept(Dept dept) {
		// TODO Auto-generated method stub
		DeptDao deptDao=new DeptDaoImpl();
		deptDao.insertDept(dept);
	}

	@Override
	public void updateDept(Dept dept) {
		// TODO Auto-generated method stub
		DeptDao deptDao=new DeptDaoImpl();
	deptDao.updateDept(dept);
	}

	@Override
	public void deleteDept(int deptno) {
		// TODO Auto-generated method stub
		DeptDao deptDao=new DeptDaoImpl();
		deptDao.deleteDept(deptno);
	}

	@Override
	public List<Dept> getDepts() {
		DeptDao deptDao=new DeptDaoImpl();
		
		return deptDao.getDepts();
	}

	@Override
	public Dept getDeptByDeptno(int deptno) {
		// TODO Auto-generated method stub
		DeptDao deptDao=new DeptDaoImpl();
		return deptDao.getDeptByDeptno(deptno);
	}

	       

}

貼個程式碼分佈圖

這樣，mysql的連線封裝基本完成，接下來是web部分。

二、Web部分:
1、各個頁面的JSP程式碼：
（1）index頁面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="DeptServlet?service=all">學生資訊管理系統</a>
</body>
</html>

（2）主頁面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" import="java.util.List,com.neusoft.dao.Dept"%>
       <%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="<%=basePath %>dept/insert.jsp" method="post">

<table border="1" width="80%" align="center" cellspacing="0">
<caption>學生資訊表</caption>
<tr><th>學生學號</th><th>學生姓名</th><th>家庭地址</th><th>操作</th><tr>
<%List<Dept>  depts=(List<Dept>)request.getAttribute("depts");
if(depts==null)
{
%>
<tr><td colspan="3">沒有符合條件的資料</td></tr>
<%}else{ 
	for(Dept dept:depts)
	{
 
%>
<tr><td><%=dept.getDeptno() %></td>
<td><%=dept.getDname() %></td>
<td><%=dept.getLoc()  %></td>
<td><a href="DeptServlet?service=modify&deptno=<%=dept.getDeptno()%>">修改</a>
<a href="DeptServlet?service=delete&deptno=<%=dept.getDeptno() %>" >刪除</a></td>
<tr>

<%}} %>
</table>
<input type="submit" value="新增" >
</form>
</body>
</html>

（3）修改頁面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" import="com.neusoft.dao.Dept"%>
       <%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="<%=basePath %>DeptServlet?service=update" method="post">

<center>
<h1>修改資訊</h1>
<% Dept dept=(Dept)request.getAttribute("dept"); %>
學生學號：<input type="text" name="deptno" value="<%=dept.getDeptno()   %>"><br>
學生姓名:<input type="text" name="dname" value="<%=dept.getDname() %>"><br>
家庭地址：<input type="text" name="loc" value="<%=dept.getLoc()%>  "><br>
<input type="submit" value="修改資訊">

</body>
</html>

2、伺服器端：
對於客戶端不同的HTTP請求對資料庫進行不同的操作，並跳轉頁面。

package com.neusoft.controller;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.neusoft.dao.Dept;
import com.neusoft.service.DeptService;
import com.neusoft.service.DeptServiceImpl;

/**
 * Servlet implementation class DeptServlet
 */
@WebServlet("/DeptServlet")
public class DeptServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

    /**
     * Default constructor. 
     */
    public DeptServlet() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		this.doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		String service=request.getParameter("service");
		if("all".equals(service))
		{
			DeptService deptService=new DeptServiceImpl();
			List<Dept> depts=deptService.getDepts();
			
			request.setAttribute("depts", depts);
			
			request.getRequestDispatcher("dept/main.jsp").forward(request, response);
		}else if("add".equals(service))
		{
			//處理請求
			int deptno=Integer.parseInt(request.getParameter("deptno"));
			String dname=request.getParameter("dname");
			String loc=request.getParameter("loc");
			Dept dept=new Dept();
			dept.setDeptno(deptno);
			dept.setDname(dname);
			dept.setLoc(loc);
			
			//呼叫相應的業務邏輯
			DeptService deptService=new DeptServiceImpl();
			deptService.insertDept(dept);
			
			//找到某個檢視響應回去
			request.getRequestDispatcher("DeptServlet?service=all").forward(request, response);
		}else if("update".equals(service))
		{
			//處理請求
			int deptno=Integer.parseInt(request.getParameter("deptno"));
			String dname=request.getParameter("dname");
			String loc=request.getParameter("loc");
			Dept dept=new Dept();
			dept.setDeptno(deptno);
			dept.setDname(dname);
			dept.setLoc(loc);
			
			//呼叫相應的業務邏輯
			DeptService deptService=new DeptServiceImpl();
			deptService.updateDept(dept);
			
			//找到某個檢視響應回去
		
			request.getRequestDispatcher("DeptServlet?service=all").forward(request, response);
			
		}
		else if("delete".equals(service))
		{
			
			int deptno=Integer.parseInt(request.getParameter("deptno"));
			//呼叫相應的業務邏輯
			DeptService deptService=new DeptServiceImpl();
			deptService.deleteDept(deptno);
			
			//找到某個檢視響應回去
			request.getRequestDispatcher("DeptServlet?service=all").forward(request, response);
			
		}else if("modify".equals(service))
		{
			int deptno=Integer.parseInt(request.getParameter("deptno"));
			//呼叫相應的業務邏輯
			DeptService deptService=new DeptServiceImpl();
		Dept dept=	deptService.getDeptByDeptno(deptno);
		
		request.setAttribute("dept", dept);
			//找到某個檢視響應回去
			request.getRequestDispatcher("dept/update.jsp").forward(request, response);
			
		}
	}

}

完整專案我已上傳至我的資源