综合案例——学生身体体质信息管理系统的开发
- 登录页面
Login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head> <title>登录页面</title> </head>
<body background="login.jpg">
<center>
<form action="Check" method="post">
<table bgcolor="#F0FFFF" width="300"height="200">
<hr width="75%" size="3" color="lightgreen">
<tr align="center">
<td colspan="6" align="center">用户登录
<hr width="75%"color="white" align="center">
</td>
</tr>
<center>
<tr ><td colspan="4" align="right">账号</td><td ><input type="text"name="user"></td></tr>
<tr><td colspan="4" align="right">密码</td><td colspan="2"><input type="password"name="password"></td></tr>
</center>
<tr align="center">
<td colspan="10">
<input type="submit"value="登 录">
<input type="reset"value="取 消 ">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
2.登录信息检查页面
Check.java
package ch04;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Check extends HttpServlet {
/**
* Constructor of the object.
*/
public Check() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
/*
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
*/
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name=request.getParameter("user");//获取用户名
String password=request.getParameter("password");//获取密码
if(("client".equals(name))&&"123456".equals(password)){//设置用户名和密码
//如果用户名和密码相对应，则跳转到学生体质管理页面
RequestDispatcher rd=request.getRequestDispatcher("main.jsp");
rd.forward(request, response);
}else{//账户名或密码不正确则跳转登录失败页面
RequestDispatcher rd=request.getRequestDispatcher("Faile.jsp");
rd.forward(request, response);
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
Servlet配置文件web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<servlet>
<servlet-name>Check</servlet-name>
<servlet-class>ch04.Check</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Check</servlet-name>
<url-pattern>/Check</url-pattern>
</servlet-mapping>
</web-app>
3.登录成功进入学生身体体质信息管理系统
4.登陆失败，显示重新登录
Faile.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head> <title>失败页面</title> </head>
<body>
登陆失败！
<!--获取用户名 -->
<%String Name=request.getParameter("user"); %>
<!--重新跳转到登陆页面 -->
<br><a href="Login.jsp">请重新登录，<%=Name %>用户！
</body>
</html>
5.设计程序，实现利用提交页面提交要添加的学生信息，然后进入添加处理程序实现将信息添加到数据库。
insert.jsp
<%@ page contentType="text/html" pageEncoding="utf-8"%>
<html>
<head> <title>添加记录的提交页面</title> </head>
<body background="right.jpg">
请输入新插入学生的信息<br>
<hr width="100%"size="3">
<form action="insert2.jsp"method="post">
<table border="0"width="238"height="252">
<tr><td>学号</td><td><input type="text"name="id"></td></tr>
<tr><td>姓名</td><td><input type="text"name="name"></td></tr>
<tr><td>性别</td><td><input type="text"name="sex"></td></tr>
<tr><td>年龄</td><td><input type="text"name="age"></td></tr>
<tr><td>体重</td><td><input type="text"name="weight"></td></tr>
<tr><td>身高</td><td><input type="text"name="hight"></td></tr>
<tr align="center">
<td colspan="2">
<input type="submit"value="提交">
<input type="reset"value="取消">
</td>
</tr>
</table>
</form>
</body>
</html>
insert2.jsp
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head> <title>添加记录的处理页面</title> </head>
<body background="right.jpg">
<%
String driverName="com.mysql.jdbc.Driver";
String userName="root";
String userPwd="123456";
String dbName="students";
String url1="jdbc:mysql://localhost:3306/students";
String url2="?user=root&password=123456";
String url3="&useUnicode=true&characterEncoding=utf-8";
String url=url1+url2+url3;
Class.forName(driverName);
Connection conn=DriverManager.getConnection(url);
//注册驱动并建立数据库连接
//形成sql的插入语句
String sql="insert into stu(id,name,sex,age,weight,hight)value(?,?,?,?,?,?)";
//利用连接对象建立PreparedStatement对象
PreparedStatement pstmt=conn.prepareStatement(sql);
//避免出现乱码
request.setCharacterEncoding("utf-8");
//得到的学号是字符串啊，用int得包装类Integer的parseInt()方法，将这个值转换为整形
int id=Integer.parseInt(request.getParameter("id"));
//获取学生姓名、性别，姓名、性别为字符串类型不用转换类型
String name=request.getParameter("name");
String sex=request.getParameter("sex");
//年龄，体重、身高强制转换类型
int age=Integer.parseInt(request.getParameter("age"));
float weight=Float.parseFloat(request.getParameter("weight"));
float hight=Float.parseFloat(request.getParameter("hight"));
//处理执行结果
//插入学号，姓名，，，身高
pstmt.setInt(1, id);
pstmt.setString(2, name);
pstmt.setString(3, sex);
pstmt.setInt(4, age);
pstmt.setFloat(5, weight);
pstmt.setFloat(6, hight);
//调用PreparedStatement对象，执行executeUpdate()方法
int n=pstmt.executeUpdate();
//根据executeUpdate()方法返回的整数，判断是否执行成功，如果大于0表示成功，否则执行失败
if(n==1){%>数据插入操作成功！<br>
<% }else{%>数据插入操作失败！<br><%}
//关闭资源
if(pstmt!=null){pstmt.close();}
if(conn!=null){conn.close();} %>
</body>
</html>
6.采用PreparedStatement的对象实现记录的查询记录，要求查询表中所有学生信息并显示在网页上。
select.jsp
<%@ page language="java" pageEncoding="utf-8"%> <html> <head> <title>查询记录提交的页面</title> </head> <body background="right.jpg"> 请选择查询条件 <hr width="100%"size="3"> <form action="select2.jsp"method="post"> 性别：男<input type="radio"value="男"name="sex"checked="checked"> 女<input type="radio"value="女"name="sex"><br><br> 体重范围：<p> 最小<input type="text"value="0"name="w1"><br><br> 最大<input type="text"value="150"name="w2"> </p> <input type="submit"value="提交"> <input type="reset"value="取消"> </form> </body> </html>
select2.jsp
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head> <title>查询记录处理的页面</title> </head>
<body background="right.jpg">
<center>
<%
String driverName="com.mysql.jdbc.Driver";
String userName="root";
String userPwd="123456";
String dbName="students";
String url1="jdbc:mysql://localhost:3306/students";
String url2="?user=root&password=123456";
String url3="&useUnicode=true&characterEncoding=utf-8";
String url=url1+url2+url3;
Class.forName(driverName);
Connection conn=DriverManager.getConnection(url);
request.setCharacterEncoding("utf-8");
String sex=request.getParameter("sex");
float weight1=Float.parseFloat(request.getParameter("w1"));
float weight2=Float.parseFloat(request.getParameter("w2"));
String sql="select * from stu where sex=? and weight>=? and weight <=?";
PreparedStatement pstmt=conn.prepareStatement(sql);
pstmt.setString(1, sex);
pstmt.setFloat(2, weight1);
pstmt.setFloat(3, weight2);
ResultSet rs=pstmt.executeQuery();
rs.last();
%>
<font size="5"color="blue">
<%=rs.getRow() %>人
</font>
<table border="2"bgcolor="ccceee"width="650">
<tr><td>记录条数</td><td>学号</td><td>姓名</td><td>性别</td><td>年龄</td><td>体重</td><td>身高</td></tr>
<%rs.beforeFirst();
while(rs.next()){
%>
<tr align="center">
<td><%=rs.getRow() %></td>
<td><%=rs.getString("id") %></td>
<td><%=rs.getString("name") %></td>
<td><%=rs.getString("sex") %></td>
<td><%=rs.getString("age") %></td>
<td><%=rs.getString("weight") %></td>
<td><%=rs.getString("hight") %></td>
</tr>
<% }
%>
</table>
</center>
<%
if(rs!=null){rs.close();}
if(pstmt!=null){pstmt.close();}
if(conn!=null){conn.close();}
%>
</body>
</html>
7.设计一个提交页面，将要查询的条件通过该页面提交给查询处理页面，在该页面中获取所提交的信息，并将这些信息作为SQL语句的参数信息，查询结束后，显示出所有满足条件的记录。
list.jsp
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head> <title>列出全部记录页面</title> </head>
<body background="right.jpg">
<center>
<%
String driverName="com.mysql.jdbc.Driver";
String userName="root";
String userPwd="123456";
String dbName="students";
String url1="jdbc:mysql://localhost:3306/students";
String url2="?user=root&password=123456";
String url3="&useUnicode=true&characterEncoding=UTF-8";
String url=url1+url2+url3;
Class.forName(driverName);
Connection conn=DriverManager.getConnection(url);
String sql="select * from stu";
//利用连接对象建立PreparedStatement对象
PreparedStatement pstmt=conn.prepareStatement(sql);
//调用PreparedStatement对象的executeQuery()方法，并返回ResultSet对象
ResultSet rs=pstmt.executeQuery();
//移至最后一条记录
rs.last();
%>
你要查询的学生数据表中公有
<font size="5"color="blue">
<!--获取行 -->
<%=rs.getRow() %>人
</font>
<table border="2"bgcolor="ccceee"width="650">
<tr bgcolor="CCCCCC"align="center">
<td>记录条数</td><td>学号</td><td>姓名</td><td>性别</td><td>年龄</td><td>体重</td><td>身高</td>
</tr>
<%rs.beforeFirst();
//移至第一条记录之前
while(rs.next()){
%>
<tr align="center">
<!-- 获取信息 -->
<td><%=rs.getRow() %></td>
<td><%=rs.getString("id") %></td>
<td><%=rs.getString("name") %></td>
<td><%=rs.getString("sex") %></td>
<td><%=rs.getString("age") %></td>
<td><%=rs.getString("weight") %></td>
<td><%=rs.getString("hight") %></td>
</tr>
<%} %>
</table>
</center>
<!-- 释放资源 -->
<%if(rs!=null){rs.close();}
if(pstmt!=null){pstmt.close();}
if(conn!=null){conn.close();}
%>
</body>
</html>
8.对数据库students表中的数据表满足条件的记录进行修改。
update.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head> <title>修改记录提交的页面</title> </head>
<body background="right.jpg">
请选择修改记录所满足的条件
<hr width="100%"size="3">
<form action="update2.jsp"method="post"><br>
姓名：<input type="text"name="name"><br><br>
性别：男<input type="radio"value="男"name="sex">
女<input type="radio"value="女"name="sex"><br><br>
<input type="submit"value="提 交">
<input type="reset"value="取消">
</form>
</body>
</html>
update2.jsp
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head> <title>读取、显示修改页面</title> </head>
<body background="right.jpg">
<%
String driverName="com.mysql.jdbc.Driver";
String userName="root";
String userPwd="123456";
String dbName="students";
String url1="jdbc:mysql://localhost:3306/students";
String url2="?user=root&password=123456";
String url3="&useUnicode=true&characterEncoding=utf-8";
String url=url1+url2+url3;
Class.forName(driverName);
Connection conn=DriverManager.getConnection(url);
request.setCharacterEncoding("utf-8");
//获取姓名、性别
String name=request.getParameter("name");
String sex=request.getParameter("sex");
//存入session容器
session.setAttribute("name", name);
session.setAttribute("sex", sex);
String sql="select * from stu where name=? and sex=?";
PreparedStatement pstmt=conn.prepareStatement(sql);
//获取姓名，性别
pstmt.setString(1,name);
pstmt.setString(2,sex);
//调用PreparedStatement对象的executeQuery()方法，并返回ResultSet对象
ResultSet rs=pstmt.executeQuery();
if(rs.next()){
//显示修改之前的结果
int id=rs.getInt("id");
String name2=rs.getString("name");
String sex2=rs.getString("sex");
int age=rs.getInt("age");
float weight=rs.getFloat("weight");
float hight=rs.getFloat("hight");
if(rs!=null){rs.close();}
if(pstmt!=null){pstmt.close();}
if(conn!=null){conn.close();}
%>
<!-- 显示执行结果update3 -->
<form action="update3.jsp"method="post">
<table border="0"width="238"height="252">
<tr><td>学号</td><td><input type="text"name="id"value=<%=id %>></td></tr>
<tr><td>姓名</td><td><input type="text"name="name2"value="<%=name2 %>"></td></tr>
<tr><td>性别</td><td><input type="text"name="sex2"value="<%=sex2 %>"></td></tr>
<tr><td>年龄</td><td><input type="text"name="age"value="<%=age %>"></td></tr>
<tr><td>体重</td><td><input type="text"name="weight"value="<%=weight %>"></td></tr>
<tr><td>身高</td><td><input type="text"name="hight"value="<%=hight %>"></td></tr>
<tr align="center">
<td colspan="2">
<input type="submit"value="提 交">
<input type="reset"value="取 消">
</td>
</tr>
</table>
</form>
<%}
else { %>
没有找到合适条件的记录！！<%
if(rs!=null){rs.close();}
if(pstmt!=null){pstmt.close();}
if(conn!=null){conn.close();}
}
%>
</body>
</html>
update3.jsp
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head> <title>处理修改页面</title> </head>
<body background="right.jpg">
<%
String driverName="com.mysql.jdbc.Driver";
String userName="root";
String userPwd="123456";
String dbName="students";
String url1="jdbc:mysql://localhost:3306/students";
String url2="?user=root&password=123456";
String url3="&useUnicode=true&characterEncoding=utf-8";
String url=url1+url2+url3;
Class.forName(driverName);
Connection conn=DriverManager.getConnection(url);
String sql="update stu set id=?,name=?,sex=?,age=?,weight=?,hight=? where name=? and sex=?";
PreparedStatement pstmt=conn.prepareStatement(sql);
request.setCharacterEncoding("utf-8");
int id=Integer.parseInt(request.getParameter("id"));
String name2=request.getParameter("name2");
String sex2=request.getParameter("sex2");
int age=Integer.parseInt(request.getParameter("age"));
float weight=Float.parseFloat(request.getParameter("weight"));
float hight=Float.parseFloat(request.getParameter("hight"));
//从session容器中取出
String name=(String)session.getAttribute("name");
String sex=(String)session.getAttribute("sex");
pstmt.setInt(1,id);
pstmt.setString(2,name2);
pstmt.setString(3,sex2);
pstmt.setInt(4,age);
pstmt.setFloat(5,weight);
pstmt.setFloat(6,hight);
pstmt.setString(7,name);
pstmt.setString(8,sex);
int n=pstmt.executeUpdate();
if(n>=1){%>
重写数据操作成功！<br>
<%}
else{
%>
重写数据操作失败！<%=n %><br>
<%}
if(pstmt!=null){pstmt.close();}
if(conn!=null){conn.close();}
%>
</body>
</html>
9.对数据库students表中的数据表，删除满足条件的记录。
delete.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>删除记录提交的页面</title> </head> <body background="right.jpg"> 请选择删除数据条件 <hr width="100%"size="3"> <form action="delete2.jsp"method="post"> 学号：<input type="text"name="id"><br><br> <input type="submit"value="提 交"> <input type="reset"value="取 消"> </form> </body> </html>
delete2.jsp
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head> <title>删除记录处理的页面</title> </head>
<body background="right.jpg">
<%
String driverName="com.mysql.jdbc.Driver";//驱动程序名
String userName="root";//数据库用户名
String userPwd="123456";//数据库密码
String dbName="students";//数据库名
String url1="jdbc:mysql://localhost:3306/students";
String url2="?user=root&password=123456";
String url3="&useUnicode=true&characterEncoding=utf-8";
String url=url1+url2+url3;
Class.forName(driverName);//加载并注册驱动程序
Connection conn=DriverManager.getConnection(url);//获取数据库连接对象conn
request.setCharacterEncoding("utf-8");//避免出现乱码
int id=Integer.parseInt(request.getParameter("id"));//获取学号并强制转换类型
String sql="delete from stu where id="+id;//sql删除语句
//利用连接对象建立PreparedStatement对象pstmt
PreparedStatement pstmt=conn.prepareStatement(sql);
//执行已发送的预编译的sql 并返回n的值
int n=pstmt.executeUpdate();
if(n==1){%>
数据删除操作成功！<br>
<%}
else{
%>
数据删除操作失败！<br>
<%}
//释放资源
if(pstmt!=null){pstmt.close();}
if(conn!=null){conn.close();}
%>
</body>
</html>
10.主页面设计框架
main.jsp
<%@ page contentType="text/html" pageEncoding="utf-8"%>
<html>
<head> <title>学生身体体质信息管理系统</title> </head>
<frameset rows="88,*">
<frame src="main_title.jsp" scrolling="no">
<frameset cols="140,*">
<frame src="main_left.jsp" scrolling="no">
<frame src="main_right.jsp"name="right" scrolling="no">
</frameset>
</frameset>
</html>
mian_title.jsp
<%@ page contentType="text/html" pageEncoding="utf-8"%>
<html>
<head> <title>页面标题</title> </head>
<body background="title.jpg">
<center>
<h1>学生身体体质信息管理系统</h1>
</center>
</body>
</html>
main_left.jsp
<%@ page contentType="text/html" pageEncoding="utf-8"%>
<html>
<head> <title>菜单页面</title> </head>
<body background="left.jpg">
<br><br><br><br><br><br><br>
<p><a href="list.jsp"target="right">列出全部学生</a></p>
<p><a href="select.jsp"target="right">按条件查询学生</a></p>
<p><a href="insert.jsp"target="right">新添加学生</a></p>
<p><a href="delete.jsp"target="right">按条件删除学生</a></p>
<p><a href="update.jsp"target="right">按条件修改学生</a></p>
</body>
</html>
mian_right.jsp
<%@ page contentType="text/html" pageEncoding="utf-8"%> <html> <head> <title>信息显示页面</title> </head> <body background="right1.jpg"> </body> </html>
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