一、相关的软件下载和环境配置
1、下载并配置JDK。
2、下载eclipse。
3、下载并配置apache-tomcat（服务器）。
4、下载MySQL（数据库）。
5、下载Navicat for MySQL（数据库可视化工具），方便对数据库的操作。
6、下载jdbc用来实现eclipse中的项目与数据库实现连接。
---以上可在网上查询教程
二、实现简单的课程信息管理系统
1、
打开eclipse，点击File—》New—》other—》Dynamic Web Project
（若你的eclipse中找不到或者没有Dynamic Web Project，可上网搜素解决办法）
点击后会出现如下窗口
需要填写Project name，可随意填写（最好是英文的），其他不需填写，填写完毕之后点击Finish
2、
项目建立完之后，eclipse左侧的Project Explorer会出现你建立的项目，如下图
3、
在我的电脑中，打开你下载的jdbc（也就是mysql-connector-java-8.0.13）所在的文件夹，如下图
将mysql-connector-java-8.0.13文件复制
粘贴在eclipse中，你所建立的项目下的 WebContent/WEB-INF/lib 文件夹下，如下图
然后，在你刚刚粘贴的文件上右击，Build Path—》Add to Build Path，如下图
这样就完成了jdbc的导入
4、
在 WebContent 文件夹下，新建如下图中的JSP文件，Login.jsp和signinerror.jsp是用来登陆的，这里不必建立。
4（1）head.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css"> .headdiv{
background-color:#3F51B5;
width:100%;
height:130px;
} .headdiv P{
font-family:YouYuan;
font-size:20px;
color:#E8EAF6;
position:relative;
left:20px;
top:45px;
} </style>
</head>
<body> <div class="headdiv">
<p>ec-web课程信息综合管理平台</p>
</div> </body>
</html>
4（2）left.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css"> .leftMenu{
background-color:#7986CB;
width:250px;
height:600px;
position:relative;
top:0px;
} .menuParent{
background-color:#BBDEFB;
} </style>
</head>
<body> <div class="leftMenu">
<div class="menu"> <div class="menuParent">
<div class="ListTitlePanel">
<div class="ListTitle">
<strong>课程信息管理</strong>
<div class="leftbgbt"></div>
</div>
</div> <div class="menuList">
<div><a target="mainAction" href="USEJSP/add.jsp">课程信息录入</a></div>
<div><a target="mainAction" href="USEJSP/update.jsp">课程信息修改</a></div>
<div><a target="mainAction" href="USEJSP/delete.jsp">删除课程信息</a></div>
<div><a target="mainAction" href="USEJSP/search.jsp">查询课程信息</a></div>
</div>
</div> </div>
</div> <script type="text/javascript"> </script> </body>
</html>
4（3）index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
这是小主页
</body>
</html>
4（4）main.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>课程信息管理系统</title> <style type="text/css"> .headframe{
width:100%;
height:130px;
border:0;
} .leftframe{
float:left;
width:250px;
height:600px;
border:0;
} .mainframe{
float:right;
width:1200px;
height:600px;
border:0;
} </style> </head> <iframe src="head.jsp" class="headframe" scrolling="no"></iframe>
<iframe src="left.jsp" class="leftframe" scrolling="no"></iframe>
<iframe src="index.jsp" name="mainAction" class="mainframe"></iframe> </html>
5、
在WebContent文件夹下建立名为USEJSP的文件夹，在USEJSP文件夹下，建立如下图的JSP文件
5（1）add.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title> <style type="text/css"> .butn{
display:inline-block;
padding: 8px 35px;
background-color:#32CD32;
color:white;
border:none;
text-align:center;
text-decoration:none;
border-radius:5px;
position:absolute;
left:40px;
top:95px;
} </style> </head>
<body> <div class="container">
<section>
<form action="${pageContext.request.contextPath}/AddServlet/AddCurrServlet?method=add" method="post" onsubmit="return check()">
<!---${pageContext.request.contextPath}的目的是找到主工程的名字，/Servlet/Userservlet就是web.xml下面配置的路径，也就是servlet的路径--->
<span class="cname">课程名称</span>
<input type="text" name="cname" class="icname" placeholder=" class-name" id="icname">
<br/> <span class="teacher">任课教师</span>
<input type="text" name="teacher" class="iteacher" placeholder=" teacher" id="iteacher">
<br/> <span class="place">上课地点</span>
<input type="text" name="place" class="iplace" placeholder=" place" id="iplace">
<br/> <input type="submit" value="保 存" class="butn">
<br/>
</form>
</section>
</div> <script type="text/javascript">
function check() { var cname = document.getElementById("icname");
var teacher = document.getElementById("iteacher");
var place = document.getElementById("iplace"); var placestr = place.value.substring(0,2); //非空
if(cname.value == '') {
alert('课程名称为空');
cname.focus();
return false;
}
if(teacher.value == '') {
alert('教师为空');
teacher.focus();
return false;
}
if(place.value == '') {
alert('上课地点为空');
place.focus();
return false;
} //教师
if(teacher.value != '王建民' && teacher.value != '王辉' && teacher.value != '刘丹' && teacher.value != '刘立嘉' && teacher.value != '杨子光'){
alert('教师名称错误');
return false;
} //教室
if(!/^基教/.test(placestr) && !/^一教/.test(placestr) && !/^二教/.test(placestr) && !/^三教/.test(placestr)) {
alert('上课地点错误');
return false;
}
return true;
} </script> </body>
</html>
5（2）addnameerror.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title> <style type="text/css"> .butn{
display:inline-block;
padding: 8px 35px;
background-color:#32CD32;
color:white;
border:none;
text-align:center;
text-decoration:none;
border-radius:5px;
position:absolute;
left:40px;
top:95px;
} </style> </head>
<body onload="alt()"> <div class="container">
<section>
<form action="${pageContext.request.contextPath}/AddServlet/AddCurrServlet?method=add" method="post" onsubmit="return check()">
<!---${pageContext.request.contextPath}的目的是找到主工程的名字，/Servlet/Userservlet就是web.xml下面配置的路径，也就是servlet的路径--->
<span class="cname">课程名称</span>
<input type="text" name="cname" class="icname" placeholder=" class-name" id="icname">
<br/> <span class="teacher">任课教师</span>
<input type="text" name="teacher" class="iteacher" placeholder=" teacher" id="iteacher">
<br/> <span class="place">上课地点</span>
<input type="text" name="place" class="iplace" placeholder=" place" id="iplace">
<br/> <input type="submit" value="保 存" class="butn">
<br/>
</form>
</section>
</div> <script type="text/javascript">
function check() { var cname = document.getElementById("icname");
var teacher = document.getElementById("iteacher");
var place = document.getElementById("iplace"); var placestr = place.value.substring(0,2); //非空
if(cname.value == '') {
alert('课程名称为空');
cname.focus();
return false;
}
if(teacher.value == '') {
alert('教师为空');
teacher.focus();
return false;
}
if(place.value == '') {
alert('上课地点为空');
place.focus();
return false;
} //教师
if(teacher.value != '王建民' && teacher.value != '王辉' && teacher.value != '刘丹' && teacher.value != '刘立嘉' && teacher.value != '杨子光'){
alert('教师名称错误');
return false;
} //教室
if(!/^基教/.test(placestr) && !/^一教/.test(placestr) && !/^二教/.test(placestr) && !/^三教/.test(placestr)) {
alert('上课地点错误');
return false;
}
return true;
} function alt() {
alert('课程名称重复');
}
</script> </body>
</html>
5（3）delete.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html> <%@page import="java.sql.*"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.Statement"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="javax.servlet.http.HttpServletRequest"%>
<html>
<head>
<meta charset="UTF-8">
<title></title> <style type="text/css"> .butn{
display:inline-block;
padding: 8px 35px;
background-color:#32CD32;
color:white;
border:none;
text-align:center;
text-decoration:none;
border-radius:5px;
position:absolute;
left:40px;
top:95px;
} </style> </head>
<body> <div>
<section>
<form action="${pageContext.request.contextPath}/DeleteServlet/DeleteCurrServlet?method=add" method="post" onsubmit="return check()">
<span class="cname">课程名称</span>
<input type="text" name="cname" id="icname" class="icname" placeholder=" class-name">
<br/> <input type="submit" value="删除" class="butn">
<br/>
</form>
</section>
</div> <script type="text/javascript">
function check() { var cname = document.getElementById("icname"); //非空
if(cname.value == '') {
alert('课程名称为空,请重新输入');
cname.focus();
return false;
}
return true;
} </script> </body>
</html>
5（4）search.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html> <%@page import="java.sql.*"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.Statement"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="javax.servlet.http.HttpServletRequest"%>
<html>
<head>
<meta charset="UTF-8">
<title></title> <style type="text/css"> .butn{
display:inline-block;
padding: 8px 35px;
background-color:#32CD32;
color:white;
border:none;
text-align:center;
text-decoration:none;
border-radius:5px;
position:absolute;
left:40px;
top:95px;
} </style> </head>
<body> <div>
<section>
<form action="${pageContext.request.contextPath}/SearchServlet/SearchCurrServlet?method=add" method="post">
<span class="cname">课程名称</span>
<input type="text" name="cname" id="cname" class="icname" placeholder=" class-name">
<br/> <span class="teacher">任课教师</span>
<input type="text" name="teacher" id="teacher" class="iteacher" placeholder=" teacher">
<br/> <span class="place">上课地点</span>
<input type="text" name="place" id="place" class="iplace" placeholder=" place">
<br/> <input type="submit" value="查询" class="butn">
<br/>
</form>
</section>
</div> </body>
</html>
5（5）update.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html> <%@page import="java.sql.*"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.Statement"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.DriverManager"%>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body> <form action="${pageContext.request.contextPath}/UpdateServlet/UpdateCurrServlet?method=update" method="post" onsubmit="return check()">
<span class="cname">需要修改的课程名称</span>
<input type="text" name="tempcname" class="itempcname" placeholder=" class-name" id="itempcname">
<br/> <table border="1" bgcolor="#ffffff" align="" cellspacing="1" cellpadding="1">
<caption>输入修改信息</caption>
<tr>
<td align="center" width=16%>新课程名称</td>
<td align="center" width=16%>新任课教师</td>
<td align="center" width=25%>新上课地点</td>
<td align="center" width=16%>操作</td>
</tr> <tr>
<td width=16% align="center"><input type="text" name="cname" class="icname" placeholder=" class-name" id="icname"></td>
<td width=16% align="center"><input type="text" name="teacher" class="iteacher" placeholder=" teacher" id="iteacher"></td>
<td width=25% align="center"><input type="text" name="place" class="iplace" placeholder=" place" id="iplace"></td>
<td width=16% align="center"><input type="submit" value="修 改" class="butn"></td>
</tr> </table>
</form> </body> <script type="text/javascript"> function check() { var ctempname = document.getElementById("itempcname");
var cname = document.getElementById("icname");
var teacher = document.getElementById("iteacher");
var place = document.getElementById("iplace"); var placestr = place.value.substring(0,2); //非空
if(ctempname.value == ''){
alert('需修改课程名称为空');
teacher.focus();
return false;
}
if(cname.value == '') {
alert('课程名称为空');
cname.focus();
return false;
}
if(teacher.value == '') {
alert('教师为空');
teacher.focus();
return false;
}
if(place.value == '') {
alert('上课地点为空');
place.focus();
return false;
} //教师
if(teacher.value != '王建民' && teacher.value != '王辉' && teacher.value != '刘丹' && teacher.value != '刘立嘉' && teacher.value != '杨子光'){
alert('教师名称错误');
return false;
} //教室
if(!/^基教/.test(placestr) && !/^一教/.test(placestr) && !/^二教/.test(placestr) && !/^三教/.test(placestr)) {
alert('上课地点错误');
return false;
}
return true;
} </script> </html>
6、
下面，生成web.xml文件（用来配置跳转路径）
在你的项目上右击，java EE Tool—》Generate Deployment Descriptor Stub
这样，在WebContent/WEB-INF文件夹下就生成了.xml文件，如下图
6（1）Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>curriculum_information_management_web</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list> <servlet>
<servlet-name>Userservlet</servlet-name> <!--servlet的别名，随便取 --> <!--servlet的包路径，后面再加上.servlet类名 ，这里的类名必须是包下面的servlet类名，目的是让找到该servlet的路径 --> <servlet-class>com.Servlet.Userservlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Userservlet</servlet-name> <!--servlet的别名，和上面保持一致就行 --> <!--jsp跳转到servlet的路径名，自己取，用来从jsp界面跳转到servlet的路径，程序会根据路径找到servlet的位置 --> <url-pattern>/Servlet/Userservlet</url-pattern><!-- -->
</servlet-mapping> <servlet>
<servlet-name>AddCurrServlet</servlet-name>
<servlet-class>com.Servlet.AddCurrServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AddCurrServlet</servlet-name>
<url-pattern>/AddServlet/AddCurrServlet</url-pattern><!-- -->
</servlet-mapping> <servlet>
<servlet-name>SearchCurrServlet</servlet-name>
<servlet-class>com.Servlet.SearchCurrServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>SearchCurrServlet</servlet-name>
<url-pattern>/SearchServlet/SearchCurrServlet</url-pattern><!-- -->
</servlet-mapping> <servlet>
<servlet-name>DeleteCurrServlet</servlet-name>
<servlet-class>com.Servlet.DeleteCurrServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DeleteCurrServlet</servlet-name>
<url-pattern>/DeleteServlet/DeleteCurrServlet</url-pattern><!-- -->
</servlet-mapping> <servlet>
<servlet-name>UpdateCurrServlet</servlet-name>
<servlet-class>com.Servlet.UpdateCurrServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UpdateCurrServlet</servlet-name>
<url-pattern>/UpdateServlet/UpdateCurrServlet</url-pattern><!-- -->
</servlet-mapping> </web-app>
7、
在项目下的 Java Resources/src 建立包，如下图
然后，在各包下建立类，如图
7（1）com.Bean
建立CurrBean.java文件
package com.Bean;
public class CurrBean {
private String name;
private String teacher;
private String place;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTeacher() {
return teacher;
}
public void setTeacher(String teacher) {
this.teacher = teacher;
}
public String getPlace() {
return place;
}
public void setPlace(String place) {
this.place = place;
}
}7（2）com.Dao（该包中的类是用来登录操作的，在这里只是写出来，不用实现）
建立Userdao.java文件
package com.Dao; import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement; import com.DBUtil.*; public class Userdao {
public int login(String username,String password)
{
Connection conn = DBUtil.getConn();//这里就是从DBUtil类里面得到连接
Statement state =null;
ResultSet rs = null;
int flag=0;
try
{
String sql = "select * from admin";//SQL语句
state = conn.createStatement();
rs=state.executeQuery(sql);
while(rs.next())
{
if(rs.getString("password").equals(password)&&rs.getString("username").equals(username))
{
flag=1;
}
}
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
DBUtil.close(rs, state, conn);
}
return flag;
} }
7（3）com.DBUtil
建立CurrDBUtil.java文件（链接数据库）
package com.DBUtil; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; public class CurrDBUtil {
public static String db_url="jdbc:mysql://localhost:3306/curriculum?useSSL=true&serverTimezone=UTC";
//这是连接数据库，userdome是数据库的名称，userUnicode=true&characterEncoding=UTF-8是将字符集设置为utf-8，避免乱码。
public static String db_user="root";//数据的用户名
public static String db_password="lty";//数据库的密码
public static Connection getConn()//获取连接，返回Connection类型，必须设置为static这样才能在其他类中使用
{
Connection conn=null;
try
{
Class.forName("com.mysql.jdbc.Driver");//加载驱动
conn=DriverManager.getConnection(db_url,db_user,db_password);//连接数据库
}
catch(Exception e)
{
e.printStackTrace();
}
return conn;
}
public static void close(Statement state,Connection conn)//关闭函数
{
if(state!=null)//只有状态和连接时，先关闭状态
{
try
{
state.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
if(conn!=null)
{
try
{
conn.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
}
public static void close(ResultSet rs,Statement state,Connection conn)
{
if(rs!=null)//有结果集，状态和连接时，先关闭结果集，在关闭状态，在关闭连接
{
try
{
rs.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
if(state!=null) {
try
{
state.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
if(conn!=null)
{
try
{
conn.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
} }
建立DBUtil.java文件（用来链接登录数据库，不必实现）
package com.DBUtil; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; public class DBUtil {
public static String db_url="jdbc:mysql://localhost:3306/userdome?useSSL=true&serverTimezone=UTC";
//这是连接数据库，userdome是数据库的名称，userUnicode=true&characterEncoding=UTF-8是将字符集设置为utf-8，避免乱码。
public static String db_user="root";//数据的用户名
public static String db_password="lty100609";//数据库的密码
public static Connection getConn()//获取连接，返回Connection类型，必须设置为static这样才能在其他类中使用
{
Connection conn=null;
try
{
Class.forName("com.mysql.jdbc.Driver");//加载驱动
conn=DriverManager.getConnection(db_url,db_user,db_password);//连接数据库
}
catch(Exception e)
{
e.printStackTrace();
}
return conn;
}
public static void close(Statement state,Connection conn)//关闭函数
{
if(state!=null)//只有状态和连接时，先关闭状态
{
try
{
state.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
if(conn!=null)
{
try
{
conn.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
}
public static void close(ResultSet rs,Statement state,Connection conn)
{
if(rs!=null)//有结果集，状态和连接时，先关闭结果集，在关闭状态，在关闭连接
{
try
{
rs.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
if(state!=null) {
try
{
state.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
if(conn!=null)
{
try
{
conn.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
} }
7（4）com.Servlet
AddCurrServlet.java 实现课程的增加
package com.Servlet; import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import com.Bean.CurrBean;
import com.DBUtil.*; public class AddCurrServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doPost(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{
resp.setContentType("add.jsp");
req.setCharacterEncoding("UTF-8"); String name;
String teacher;
String place; name = req.getParameter("cname");
teacher = req.getParameter("teacher");
place = req.getParameter("place"); CurrBean currbean = new CurrBean(); currbean.setName(name);
currbean.setTeacher(teacher);
currbean.setPlace(place); AddCurrInterface addCurrInterface = new AddCurrInterface();
@SuppressWarnings("unused")
int temp = 0; try {
temp = addCurrInterface.addUser(currbean);
if(temp == 1) {
resp.sendRedirect(req.getContextPath()+"/index.jsp");
}else if(temp == 2) {
resp.sendRedirect(req.getContextPath()+"/USEJSP/addnameerror.jsp");
} } catch (SQLException e) {
e.printStackTrace();
}
}
} class AddCurrInterface extends HttpServlet{ private static final long serialVersionUID = 1L; public int addUser(CurrBean cb) throws SQLException { String name;
String teacher;
String place; name = cb.getName();
teacher = cb.getTeacher();
place = cb.getPlace(); //连接数据库
Connection conn = CurrDBUtil.getConn();
PreparedStatement pstmt = null; Statement stmt = conn.createStatement();
String selectsql = "select * from curr_info";
ResultSet rs = stmt.executeQuery(selectsql);
int tt = 0; while(rs.next()) {
if(rs.getString("name").equals(name)) {
tt = 2;
}
} if(tt == 0) {
String sql = "insert into curr_info (name,teacher,place) values (?,?,?)";//数据库指令
pstmt = conn.prepareStatement(sql);//发送sql语句
//下面是插入到具体的地方
pstmt.setString(1, name);
pstmt.setString(2, teacher);
pstmt.setString(3, place);
pstmt.executeUpdate(); System.out.println("添加成功！"); return 1;
}else if(tt == 2) {
return 2;
} return 0; } }
DeleteCurrServlet.java 实现课程的删除
package com.Servlet; import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import com.DBUtil.CurrDBUtil; public class DeleteCurrServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doPost(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{
resp.setContentType("delete.jsp");
req.setCharacterEncoding("UTF-8"); String name;
@SuppressWarnings("unused")
int ii = 0; name = req.getParameter("cname"); //连接数据库
Connection conn = CurrDBUtil.getConn();
try {
Statement stmt = conn.createStatement(); String selectsql = "select * from curr_info";
ResultSet rs = stmt.executeQuery(selectsql); while(rs.next()) {
if(rs.getString("name").equals(name)) {
ii = rs.getInt("id");
//Get output stream and writers
OutputStream out=resp.getOutputStream();
PrintWriter pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(out)));
//Print HTML
pw.println("<HTML><HEAD><TITLE>输出HTML标签</HEAD></TITLE><BODY>");
pw.println("<table border=\"1\" bgcolor=\"#ffffff\" align=\"\" cellspacing=\"1\" cellpadding=\"1\">");
pw.println("<tr>\r\n" +
"<td align=\"center\" width=16%>课程名称</td>\r\n" +
"<td align=\"center\" width=16%>任课教师</td>\r\n" +
"<td align=\"center\" width=35%>上课地点</td>\r\n" +
"</tr>");
pw.println("<tr>\r\n" +
"<td width=16% align=\"center\">"+rs.getString("name")+"</td>\r\n" +
"<td width=16% align=\"center\">"+rs.getString("teacher")+"</td>\r\n" +
"<td width=35% align=\"center\">"+rs.getString("place")+"</td>\r\n" +
"</tr>");
pw.println("该课程已删除！");
pw.println("</BODY></HTML>");
pw.flush();
pw.close();
}
} String delesql="delete from curr_info where name='"+name+"' ";//生成一条sql语句
stmt.executeUpdate(delesql);//执行sql语句 } catch (SQLException e) {
e.printStackTrace();
} }
}
SearchCurrServlet.java 实现课程的查询
package com.Servlet; import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import com.DBUtil.CurrDBUtil; public class SearchCurrServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doPost(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{
resp.setContentType("search.jsp");
req.setCharacterEncoding("UTF-8"); String name;
String teacher;
String place; name = req.getParameter("cname");
teacher = req.getParameter("teacher");
place = req.getParameter("place"); int temp = 0;
//连接数据库
Connection conn = CurrDBUtil.getConn();
try {
Statement stmt = conn.createStatement();
String selectsql = "select * from curr_info";
ResultSet rs = stmt.executeQuery(selectsql); //Get output stream and writers
OutputStream out=resp.getOutputStream();
PrintWriter pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(out)));
//Print HTML pw.println("<HTML><HEAD><TITLE>输出HTML标签</HEAD></TITLE><BODY>");
pw.println("<table border=\"1\" bgcolor=\"#ffffff\" align=\"\" cellspacing=\"1\" cellpadding=\"1\">");
pw.println("<tr>\r\n" +
"<td align=\"center\" width=16%>课程名称</td>\r\n" +
"<td align=\"center\" width=16%>任课教师</td>\r\n" +
"<td align=\"center\" width=35%>上课地点</td>\r\n" +
"</tr>");
while(rs.next()) {
if(rs.getString("name").equals(name) || rs.getString("teacher").equals(teacher) || rs.getString("place").equals(place)) {
pw.println("<tr>\r\n" +
"<td width=16% align=\"center\">"+rs.getString("name")+"</td>\r\n" +
"<td width=16% align=\"center\">"+rs.getString("teacher")+"</td>\r\n" +
"<td width=35% align=\"center\">"+rs.getString("place")+"</td>\r\n" +
"</tr>");
temp++;
}
/*
else {
//Get output stream and writers
OutputStream out=resp.getOutputStream();
PrintWriter pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(out)));
//Print HTML
pw.println("<HTML><HEAD><TITLE>输出HTML标签</HEAD></TITLE><BODY>");
pw.println("查询错误！");
pw.println("</BODY></HTML>");
pw.flush();
pw.close();
}
*/
}
if(temp == 0) {
pw.println("查询错误！");
} pw.println("</BODY></HTML>");
pw.flush();
pw.close(); } catch (SQLException e) {
e.printStackTrace();
} }
}
UpdateCurrServlet.java 实现课程的修改
package com.Servlet; import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import com.DBUtil.CurrDBUtil; public class UpdateCurrServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doPost(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{
resp.setContentType("update.jsp");
req.setCharacterEncoding("UTF-8"); String tempname;
String name;
String teacher;
String place; tempname = req.getParameter("tempcname");
name = req.getParameter("cname");
teacher = req.getParameter("teacher");
place = req.getParameter("place"); //连接数据库
Connection conn = CurrDBUtil.getConn();
try {
Statement stmt = conn.createStatement();
String updatesql = "update curr_info set name='"+name+"',teacher='"+teacher+"',place='"+place+"' where name='"+tempname+"'";
stmt.executeUpdate(updatesql);//执行sql语句
resp.sendRedirect(req.getContextPath()+"/index.jsp");
} catch (SQLException e) {
e.printStackTrace();
}
}
}