JSP部分：
err.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'login.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body bgcolor="pink">
<center>
<!-- 引入一张图片 -->
<h1>操作失败！</h1>
<a href="mian.jsp">返回主界面</a>
<br>
</center>
</body>
</html>
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'login.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body bgcolor="pink">
<center>
<%
//判断是否正常登陆
String err=request.getParameter("err");
if(err != null)
{
if(err.equals("1"))
{
out.println("<font color=yellow size=7>用户没有正常登陆，请登陆！！！</font><br>");
}
}
%>
<!-- 引入一张图片 -->
<img src="image/logo1.png"></img>
<hr>
用户登录 <br>
<!-- <form action="loginCl.jsp" method="post"> -->
<form action="LoginClServlet" method="post">
用户名: <input type="text" name="username"><br>
密 码: <input type="password" name="passwd"><br>
<input type="submit" value="登录">
<input type="reset" value="重置">
<INPUT type="radio" name="P" value="A">学生
<INPUT type="radio" name="P" value="B">老师
</form>
<hr/>
</center>
</body>
</html>
loginCl.jsp这个其实已经没有用了，只不过是一个纪念的过程而已
<%@ page language="java" import="java.util.*,java.sql.*,com.xf.model.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'loginCl.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
//接受用户名和，密码，完成对用户名的验证
String u=request.getParameter("username");
String p=request.getParameter("passwd");
/*
//验证，先简单验证一下，不到数据库上验证
if(u.equals("xiaofeng") && p.equals("123"))
{
//合法，跳转到wel.jsp
//如何把loginCl.jsp得到的数据传给下一个页面
//1.cookie2.sessio3.response.sendRedirect
response.sendRedirect("wel.jsp?user="+u);
}
else
{
//不合法的用户
response.sendRedirect("login.jsp");
}
*/
/*
//通过数据库验证账号密码
//1、加载驱动
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
//2、得到链接
Connection ct=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=spdb1","sa","");
//3、创建Statement
Statement sm=ct.createStatement();
//4、查询
ResultSet rs=sm.executeQuery("select passwd from users where username='"+u+"'");
//5、根据查到的结果来判断
if(rs.next())
{
if(rs.getString(1).equals(p))
{
//合法
response.sendRedirect("wel.jsp?user="+u);
}
else
{
response.sendRedirect("login.jsp?errNo=1");
}
}
else
{
//账号错误
response.sendRedirect("login.jsp?errNo=2");
}
*/
UserBeanCl ubc=new UserBeanCl();
if(ubc.checkUser(u,p))
{
response.sendRedirect("wel.jsp?user="+u);
}
else
{
response.sendRedirect("login.jsp");
}
%>
</body>
</html>
main_2.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'mian.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body bgcolor="pink">
<center>
<!-- 引入界面！！ -->
<hr> 选择操作选项<hr>
<a href="UserClServlet?pageNow=1&flag=fenyes">查看学习情况</a><br>
<a href="addUser.jsp">添加用户</a><br>
<hr>
</center>
</body>
</html>
mian.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'mian.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body bgcolor="pink">
<center>
<!-- 引入界面！！ -->
<hr> 选择操作选项<hr>
<a href="UserClServlet?pageNow=1&flag=fenye">管理用户</a><br>
<hr>
</center>
</body>
</html>
suc.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'login.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body bgcolor="pink">
<center>
<!-- 引入一张图片 -->
<hr>
<h1>操作成功！</h1>
<a href="mian.jsp">返回主界面</a>
<hr>
</center>
</body>
</html>
updv_grade.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'updUser.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body bgcolor="pink">
<%
long Sno=Long.parseLong(request.getParameter("Sno"));
%>
<center>
<!-- 引入界面！！ -->
<h1>请输入用户信息</h1>
<form action="UserClServlet?flag=updv_grade&Sno=<%=Sno %>" method="post">
<table border="1">
<tr> <td bgcolor="yellow">课程号</td> <td><input type="text" name="Cno" /></td> </tr>
<tr> <td bgcolor="silver">课程名</td> <td><input type="text" name="Cname" /></td> </tr>
<tr> <td bgcolor="yellow">任课老师</td> <td><input type="text" name="Tname" /></td> </tr>
<tr> <td bgcolor="silver">分数</td> <td><input type="text" name="Grade" /></td> </tr>
<tr> <td> <input type="submit" value="修改用户" /> </td>
<td><input type="reset" value="重置"/></td> </tr>
</table>
</form>
<hr>
</center>
</body>
</html>
wel.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'updUser.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body bgcolor="pink">
<%
long Sno=Long.parseLong(request.getParameter("Sno"));
%>
<center>
<!-- 引入界面！！ -->
<h1>请输入用户信息</h1>
<form action="UserClServlet?flag=updv_grade&Sno=<%=Sno %>" method="post">
<table border="1">
<tr> <td bgcolor="yellow">课程号</td> <td><input type="text" name="Cno" /></td> </tr>
<tr> <td bgcolor="silver">课程名</td> <td><input type="text" name="Cname" /></td> </tr>
<tr> <td bgcolor="yellow">任课老师</td> <td><input type="text" name="Tname" /></td> </tr>
<tr> <td bgcolor="silver">分数</td> <td><input type="text" name="Grade" /></td> </tr>
<tr> <td> <input type="submit" value="修改用户" /> </td>
<td><input type="reset" value="重置"/></td> </tr>
</table>
</form>
<hr>
</center>
</body>
</html>
wel_2.jsp
<%@ page language="java" import="java.util.*,java.sql.*,com.xf.model.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'wel.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
<!--
function abc()
{
return window.confirm("确定要修改？");
}
-->
</script>
</head>
<body bgcolor="pink">
<%
//如果用户正常登陆，则保存了session的值
String u=(String)session.getAttribute("myName");
//如果非法登陆,jsp内置对象，response,request,out,session
if(u == null)
{
response.sendRedirect("login.jsp?err=1");
return;
}
%>
<center> admin: <%=u %><br>
<a href="login.jsp">返回重新登录</a> <a href="mian.jsp">返回主界面</a>
<hr>
<h1>用户信息列表</h1>
<%
/*
//定义四个变量
int pageNow=1; //默认从第一页开始
int pageSize=3; //一共的页数
int rowCount=0; //这个从数据库查询
int pageCount=0; //通过rowCount和pageSize求得
String s_pageNow=request.getParameter("pageNow");
if(s_pageNow != null)
{
//从超链接处得到值
pageNow=Integer.parseInt(s_pageNow);
}
//1.加载驱动
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
//2.得到链接
Connection ct=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=spdb1","sa","");
//3.创建statement
Statement sm=ct.createStatement();
//4.到数据库中查询
ResultSet rs=sm.executeQuery("select count(*) from users");
//5.对查询结果进行判断
//这里注意一定要next，不然GG思密达
if(rs.next())
{
rowCount=rs.getInt(1);
}
//计算pageCount，算法很多
if(rowCount%pageSize == 0)
{
pageCount=rowCount/pageSize;
}
else
{
pageCount=rowCount/pageSize+1;
}
//查出要显示出来的记录
rs=sm.executeQuery("select top "+pageSize+" * from users where userId not in (select top "
+pageSize*(pageNow-1)+" userId from users)");
*/
//调用UserBeanCl的方法（创建一个UserBeanCl的实例然后调用他的方法），完成分页显示
// UserBeanCl ubc=new UserBeanCl();
// ArrayList a1=ubc.getUsersByPage(pageNow);
//要显示的用户信息从request中取
ArrayList a1=(ArrayList)request.getAttribute("result");
//显示出来
%>
<table border="1">
<tr bgcolor="pink"><td>学号</td><td>课程号</td><<td>课程名</td><td>任课老师</td><td>分数</td></tr>
<%
//while(rs.next())
// String [] color={"yellow","pink","yello"};
for(int i=0 ; i<a1.size() ; ++i)
{
//重arraylist中取出UserBean
v_gradeBean vb=(v_gradeBean)a1.get(i);
%>
<tr bgcolor="yellow"><td><%=vb.getSno() %></td><td><%=vb.getCno() %></td><td><%=vb.getCname() %></td>
<td><%=vb.getTname() %></td><td><%=vb.getGrade() %></td>
<%
}
%>
</table>
<%
//首页
out.println("<a href=UserClServlet?flag=fenyes&pageNow="+1+">[首页]</a>");
//String s_pageNow=(String)request.getAttribute("pageNow");
int pageNow=Integer.parseInt((String)request.getAttribute("pageNow"));
//上一页
if(pageNow != 1)
{
out.println("<a href=UserClServlet?flag=fenyes&pageNow="+(pageNow-1)+">[上一页]</a>");
}
//得到pageCount
// int pageCount=ubc.getPageCount();
String s_pageCount=(String)request.getAttribute("pageCount");
int pageCount=Integer.parseInt(s_pageCount);
//显示超链接
for(int i=1 ; i<=pageCount ; ++i)
{
out.println("<a href=UserClServlet?flag=fenyes&pageNow="+i+">["+i+"]</a>");
}
//下一页
if(pageNow != pageCount)
{
out.println("<a href=UserClServlet?flag=fenyes&pageNow="+(pageNow+1)+">[下一页]</a>");
}
//尾页
out.println("<a href=UserClServlet?flag=fenyes&pageNow="+pageCount+">[尾页]</a>");
%>
<br>
</center>
</body>
</html>
javaBean部分
ConnDB.java
/**
* 功能：得到数据库的链接
* 时间：2014年6月4日10:47:57
* 作者：cutter_point
*/
package com.xf.model;
import java.sql.*;
public class ConnDB
{
private Connection ct=null;
public Connection getConn()
{
try
{
//1、加载驱动
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
//2、得到链接
ct=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=spdb1","sa","");
} catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return ct;
}
}
Tools.java
public class Tools
{
//提供一个方法，转换中文乱码
public static String getNewString(String input)
{
String result="";
try
{
result=new String(input.getBytes("iso-8859-1"),"gb2312");
}
catch (Exception e)
{
// TODO: handle exception
e.printStackTrace();
}
return result;
}
}
UserBean.java
/**
* 功能：这是一个javabean,对应users表，代表数据
* 时间：2014年6月4日10:39:33
* 作者：cutter_point
*/
package com.xf.model;
public class UserBean
{
private int userId;
private String username;
private String passwd;
private String email;
private int grade;
public int getUserId()
{
return userId;
}
public void setUserId(int userId)
{
this.userId = userId;
}
public String getUsername()
{
return username;
}
public void setUsername(String username)
{
this.username = username;
}
public String getPasswd()
{
return passwd;
}
public void setPasswd(String passwd)
{
this.passwd = passwd;
}
public String getEmail()
{
return email;
}
public void setEmail(String email)
{
this.email = email;
}
public int getGrade()
{
return grade;
}
public void setGrade(int grade)
{
this.grade = grade;
}
}
UserBeanCl.java
/**
* 功能：这是一个处理类，也叫做bo，主要封装对users表的各种操作
* 每一个UserBean对象放到ArrayList里面去，更早关闭和数据库链接
* 时间：2014年6月4日10:43:48
*/
package com.xf.model;
import java.io.InputStream;
import java.io.Reader;
import java.math.BigDecimal;
import java.net.URL;
import java.sql.*;
import java.sql.Date;
import java.util.*;
import com.xf.model.*;
public class UserBeanCl
{
private Statement sm=null;
private ResultSet rs=null;
private Connection ct=null;
private int pageSize=3; //每页大小
private int rowCount=0; //行数总计
private int pageCount=0; //通过rowCount和pageSize求得
//修改信息
/**
* @author xiaofeng(没错，我就是肖锋)
* @param userName:用户名字，就是账号
* @param passwd:通行密码
* @return boolean: 如果true那就添加成功，如果false那就不成功
*/
public boolean updUser(long Sno, String Cno, String Cname, String Tname, int Grade)
{
boolean b=false;
try
{
//创建连接,的数据库
ct=new ConnDB().getConn();
//对要操作的数据库声明
sm=ct.createStatement();
//执行语句
String sql="update v_grade set Cno='"+Cno+"', Cname='"+Cname+"', Tname='"+Tname+"', Grade="+Grade+" where Sno="+Sno+"";
int a=sm.executeUpdate(sql);
if(a == 1)
{
//修改成功
b=true;
}
}
catch (Exception e)
{
// TODO: handle exception
e.printStackTrace();
}
finally
{
this.close();
}
return b;
}
//添加信息
//删除信息处理
/**
* @author xiaofeng(没错，我就是肖锋)
* @param userName:用户名字，就是账号
* @param passwd:通行密码
* @param email:电子邮件
* @param grade:用户等级
* @return boolean: 如果true那就添加成功，如果false那就不成功
*/
public boolean delv_gradeBySno(long Sno)
{
boolean b=false;
try
{
//得到链接
ct=new ConnDB().getConn();
//声明要执行SQL
sm=ct.createStatement();
//执行语句,删除语句返回影响的行数
int a=sm.executeUpdate("delete from v_grade where Sno='"+Sno+"'");
if(a == 1)
{
//删除成功
b=true;
}
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
finally
{
this.close();
}
return b;
}
public void close()
{
try
{
if(rs != null)
{
rs.close();
rs=null;
}
if(sm != null)
{
sm.close();
sm=null;
}
if(ct != null)
{
ct.close();
ct=null;
}
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//得到pageCount，页数总计
public int getPageCount()
{
try
{
//得到链接
ct=new ConnDB().getConn();
//声明，创建一个sm
sm=ct.createStatement();
//4.到数据库中查询
ResultSet rs=sm.executeQuery("select count(*) from v_grade");
//这里注意一定要next，不然GG思密达
if(rs.next())
{
rowCount=rs.getInt(1);
}
//计算pageCount的结果
if(rowCount%pageSize == 0)
{
pageCount=rowCount/pageSize;
}
else
{
pageCount=rowCount/pageSize+1;
}
}
catch (Exception e)
{
// TODO: handle exception
e.printStackTrace();
}
finally
{
this.close();
}
return pageCount;
}
//得到用户需要显示地信息（分页）
public ArrayList getUsersByPage(int pageNow)
{
ArrayList a1=new ArrayList();
try
{
//得到链接
ct=new ConnDB().getConn();
//创建statement
sm=ct.createStatement();
//查询出需要显示地信息,rs用来得到数据查询的结果
rs=sm.executeQuery("select top "+pageSize+"* from v_grade where Sno not in ( select top "+pageSize*(pageNow-1)+" Sno from v_grade )");
//吧得到的信息存放到ArrayList上面去
while(rs.next())
{
v_gradeBean vb=new v_gradeBean();
vb.setSno(rs.getLong(1));
vb.setCno(rs.getString(2));
vb.setCname(rs.getString(3));
vb.setTname(rs.getString(4));
vb.setGrade(rs.getInt(5));
//将ub放到arraylist里面去
a1.add(vb);
}
}
catch (Exception e)
{
e.printStackTrace();
// TODO: handle exception
}
finally
{
//关闭资源
this.close();
}
return a1;
}
//检查账号密码是否正确
public boolean checkUser(String u, String p)
{
boolean b=false;
try
{
System.out.println("???");
//到数据库中去验证
ct=new ConnDB().getConn();
//3、创建statement
sm=ct.createStatement();
//4、进行查询,把查询第一个结果放到rs中
rs=sm.executeQuery("select passwd from users where username='"+u+"'");
//根据结果来判断是否是要寻找的数据
if(rs.next())
{
//用户名存在，验证密码
if(rs.getString(1).equals(p))
{
b=true;
}
}
}
catch (Exception e)
{
e.printStackTrace();
// TODO: handle exception
}
finally
{
this.close();
}
return b;
}
}
v_gradeBean.java
/**
* 功能：存放v_grade视图的属性
*/
package com.xf.model;
public class v_gradeBean
{
private long Sno;
private String Cno;
private String Cname;
private String Tname;
private int Grade;
public long getSno()
{
return Sno;
}
public void setSno(long sno)
{
Sno = sno;
}
public String getCno()
{
return Cno;
}
public void setCno(String cno)
{
Cno = cno;
}
public String getCname()
{
return Cname;
}
public void setCname(String cname)
{
Cname = cname;
}
public String getTname()
{
return Tname;
}
public void setTname(String tname)
{
Tname = tname;
}
public int getGrade()
{
return Grade;
}
public void setGrade(int grade)
{
Grade = grade;
}
}
Servlet处理器部分
LoginClServlet.java
/**
* 功能：这是一个控制器，完成对用户身份的验证，本身是不会去完成业务逻辑的
* 它主要是去调用model完成对数据的处理
* 时间：2014年6月5日12:56:46
* 作者：cutter_point
*/
package com.xf.controller;
import com.xf.model.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginClServlet extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
//得到账号密码
String u=request.getParameter("username"); //账号
String s1=request.getParameter("P"); //单选框
// u=new String(u.getBytes("iso-8859-1"),"gb2312");
//转化中文乱码
u=Tools.getNewString(u);
String p=request.getParameter("passwd"); //密码
System.out.println("账号u="+u+" 密码p="+p);
//调用模型对他进行验证
UserBeanCl ubc=new UserBeanCl();
if(ubc.checkUser(u, p))
{
System.out.println("这是使用的Servlet完成验证！！");
//合法
//跳转
//response.sendRedirect("wel.jsp");
//在进入wel.jsp之前把数据都准备好
//首先显示的是默认的第一页
ArrayList al=ubc.getUsersByPage(1);
int pageCount=ubc.getPageCount();
request.setAttribute("result", al);
request.setAttribute("pageCount", pageCount+"");
request.setAttribute("pageNow", "1");
//存放session
request.getSession().setAttribute("myName", u);
//但是上面方法效率不高,高效率的是
if(s1.equals("B"))
{
request.getRequestDispatcher("mian.jsp?user="+u).forward(request, response);
}
else
{
request.getRequestDispatcher("main_2.jsp?user="+u).forward(request, response);
}
}
else
{
//不合法
// response.sendRedirect("login.jsp");
//理由同上
request.getRequestDispatcher("login.jsp").forward(request, response);
}
}
}
UserClServlet.java
/**
* 功能：这个控制器将处理用户的分页显示，用户的删除修改查询，添加
* 时间：2014年6月5日13:47:03
* 作者：cutter_point
*/
package com.xf.controller;
import com.xf.model.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class UserClServlet extends HttpServlet
{
/**
* 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
{
//得到用户希望显示的pageNow,和flag
System.out.println("使用UserClServlet!");
String s_pageNow=request.getParameter("pageNow");
String flag=request.getParameter("flag");
//使用UserBeanCl的方法调用得到pageNow
if(flag.equals("fenye"))
{
try
{
int pageNow=Integer.parseInt(s_pageNow);
//调用UserBeanCl
UserBeanCl ubc=new UserBeanCl();
//在进入wel.jsp之前把数据都准备好
ArrayList al=ubc.getUsersByPage(pageNow);
int pageCount=ubc.getPageCount();
request.setAttribute("result", al);
request.setAttribute("pageCount", pageCount+"");
request.setAttribute("pageNow", pageNow+"");
// request.setAttribute("pageNow", pageNow); 不行必须在后面加引号，不然没法用，因为别人
//默认吧pageNow看成string了，结果传过去了，以为是String类型，实际是int类型，结果就出错了
System.out.println("分页是使用了UserClServlet!!");
//从新跳转回wel.jsp里面去
request.getRequestDispatcher("wel.jsp").forward(request, response);
}
catch (Exception e)
{
// TODO: handle exception
e.printStackTrace();
}
}
//删除用户信息
else if(flag.equals("delUser"))
{
UserBeanCl ubc=new UserBeanCl();
//吧id得到
long Sno=Long.parseLong(request.getParameter("Sno"));
//调用删除的方法
if(ubc.delv_gradeBySno(Sno))
{
//删除成功
request.getRequestDispatcher("suc.jsp").forward(request, response);
}
else
{
//删除失败
request.getRequestDispatcher("err.jsp").forward(request, response);
}
}
else if(flag.equals("updv_grade"))
{
long Sno=Long.parseLong(request.getParameter("Sno"));
String Cno=request.getParameter("Cno");
String Cname=request.getParameter("Cname");
String Tname=request.getParameter("Tname");
int Grade=Integer.parseInt(request.getParameter("Grade"));
UserBeanCl ubc=new UserBeanCl();
//一个判断是否修改了的函数
if(ubc.updUser(Sno, Cno, Cname, Tname, Grade))
{
request.getRequestDispatcher("suc.jsp").forward(request, response);
}
else
{
//添加失败
request.getRequestDispatcher("err.jsp").forward(request, response);
}
}
else if(flag.equals("fenyes")) //学生登录
{
try
{
int pageNow=Integer.parseInt(s_pageNow);
//调用UserBeanCl
UserBeanCl ubc=new UserBeanCl();
//在进入wel.jsp之前把数据都准备好
ArrayList al=ubc.getUsersByPage(pageNow);
int pageCount=ubc.getPageCount();
request.setAttribute("result", al);
request.setAttribute("pageCount", pageCount+"");
request.setAttribute("pageNow", pageNow+"");
// request.setAttribute("pageNow", pageNow); 不行必须在后面加引号，不然没法用，因为别人
//默认吧pageNow看成string了，结果传过去了，以为是String类型，实际是int类型，结果就出错了
System.out.println("分页是使用了UserClServlet!!");
//从新跳转回wel.jsp里面去
request.getRequestDispatcher("wel_2.jsp").forward(request, response);
}
catch (Exception e)
{
// TODO: handle exception
e.printStackTrace();
}
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException{
this.doGet(request, response);
}
}
PS:mvc开发模式下的一个用户管理系统，增删改查这些基本功能都已经实现，没有贴出数据库部分，因为没必要啊！！
时间： 2024-10-19 10:14:18