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基于Jsp和Servlet的简单项目[通俗易懂]

老牧童 • • Servlet • 阅读 282

基于Jsp和Servlet的简单项目[通俗易懂]一、项目名称使用MVC模式和三层开发架构，开发一个完整的“注册登录退出”模块。二、项目环境1、软件环境：系统环境：win10JDK版本：jdk1.8.0_181IDE版本：eclipse-java-oxygen-3a-win32-x86_64avaEEvarsion：JavaEE5–Web2.5Javaversion:1.7.服务器版本：apache-tomcat-7…

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xxx管理系统的基本实现

一、项目名称

使用MVC模式和三层开发架构，开发一个完整的“注册登录退出”模块。

二、项目环境

1、软件环境：

系统环境：win10
JDK版本： jdk1.8.0_181
IDE版本：eclipse-java-oxygen-3a-win32-x86_64
avaEE varsion：JavaEE5 –Web2.5
Java version: 1.7.
服务器版本：apache-tomcat-7.0.69
浏览器版本：Google Chrome浏览器

2、项目思路 ：

通过MVC开发流程，实现项目的架构。然后利用Servlet+Jsp+Jdbc的功能开发流程，实现登陆注册退出功能。
通过DataServlet实现服务器在接收到浏览器发送的请求后，会调用对应的Servlet进行请求处理，从而将多个业务逻辑功能组合到一起。

3、项目所用知识点：

模板的套用
MVC开发流程
Servlet+Jsp+Jdbc的功能开发流程
request和session作用域的使用
浏览器发起请求到服务器的方式（重点记忆）
BaseServlet的抽取和使用

4、项目架构：

在这里插入图片描述

三、项目源码

数据库设计

##创建用户表
create table t_user(
uid int(10) not null auto_increment,
uname varchar(100) not null,
pwd varchar(100) not null, 
sex char(4) not null,
age int(3) not null,
birthday date not null,
primary key(uid)
);

insert into t_user values(default,'张三',123,'男',18,'1988-09-09' );
insert into t_user values(default,'小七',456,'男',20,'1996-09-09' );

在这里插入图片描述

UserDaoImpl.java

  package com.bjsxt.dao.impl;
    
    import java.sql.Connection;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    
    import com.bjsxt.dao.UserDao;
    import com.bjsxt.pojo.User;
    import com.bjsxt.util.DBUtil;
    /** * 导的不是jdbc包，全是sql包 * @author chy * */
    public class UserDaoImpl implements UserDao { 
   
    	//查询用户信息
    	@Override
    	public User getUserInfoDao(String uname, String pwd) { 
   
    		//声明jdbc变量
    		Connection conn=null;
    		PreparedStatement ps=null;
    		ResultSet rs=null;
    		//声明变量
    		User u=null;
    		
    		try { 
   
    			
    			//创建连接
    			conn=DBUtil.getConnection();
    			//创建sql命令
    			String sql="select * from t_user where uname=? and pwd=?";
    			//创建SQL命令对象
    			ps=conn.prepareStatement(sql);
    			//给占位符赋值
    			ps.setString(1,	uname);
    			ps.setString(2, pwd);
    			//执行sql命令
    			rs=ps.executeQuery();
    			//遍历
    			while (rs.next()) { 
   
    				//给变量赋值
    				u=new User();
    				u.setUid(rs.getInt("uid"));
    				u.setUname(rs.getString("uname"));
    				u.setPwd(rs.getString("pwd"));
    				u.setSex(rs.getString("sex"));
    				u.setAge(rs.getInt("age"));
    				u.setBirthday(rs.getString("birthday"));
    			}
    			//关闭资源
    			//返回结果
    		} catch (Exception e) { 
   
    			e.printStackTrace();
    		}finally{ 
   
    			DBUtil.closeAll(rs, ps, conn);
    		}
    		
    		return u;
    	}
    
    	//用户注册
    	@Override
    	public int regUserInfoDao(String uname, String pwd, String sex, int age,
    			String birthday) { 
   
    		
    		//创建sql语句
    		String sql="insert into t_user values(default,?,?,?,?,?)";
    		return DBUtil.executeDML(sql, uname,pwd,sex,age,birthday);
    	}
    
    }

UserDao.java

  package com.bjsxt.dao;
    
    import com.bjsxt.pojo.User;
    
    public interface UserDao { 
   
    	/** * 根据用户名和密码，查询用户信息 * @author chy * */
    	User getUserInfoDao(String uname, String pwd);
    
    	
    	int regUserInfoDao(String uname, String pwd, String sex, int age,
    			String birthday);
    
    }

User.java

 package com.bjsxt.pojo;
    
    public class User { 
   
    	private int uid;
    	private String uname;
    	private String pwd;
    	private String sex;
    	private int age;
    	private String birthday;
    	public int getUid() { 
   
    		return uid;
    	}
    	public void setUid(int uid) { 
   
    		this.uid = uid;
    	}
    	public String getUname() { 
   
    		return uname;
    	}
    	public void setUname(String uname) { 
   
    		this.uname = uname;
    	}
    	public String getPwd() { 
   
    		return pwd;
    	}
    	public void setPwd(String pwd) { 
   
    		this.pwd = pwd;
    	}
    	public String getSex() { 
   
    		return sex;
    	}
    	public void setSex(String sex) { 
   
    		this.sex = sex;
    	}
    	public int getAge() { 
   
    		return age;
    	}
    	public void setAge(int age) { 
   
    		this.age = age;
    	}
    	public String getBirthday() { 
   
    		return birthday;
    	}
    	public void setBirthday(String birthday) { 
   
    		this.birthday = birthday;
    	}
    	public User(int uid, String uname, String pwd, String sex, int age,
    			String birthday) { 
   
    		super();
    		this.uid = uid;
    		this.uname = uname;
    		this.pwd = pwd;
    		this.sex = sex;
    		this.age = age;
    		this.birthday = birthday;
    	}
    	public User() { 
   
    		super();
    	}
    	@Override
    	public int hashCode() { 
   
    		final int prime = 31;
    		int result = 1;
    		result = prime * result + age;
    		result = prime * result
    				+ ((birthday == null) ? 0 : birthday.hashCode());
    		result = prime * result + ((pwd == null) ? 0 : pwd.hashCode());
    		result = prime * result + ((sex == null) ? 0 : sex.hashCode());
    		result = prime * result + uid;
    		result = prime * result + ((uname == null) ? 0 : uname.hashCode());
    		return result;
    	}
    	@Override
    	public boolean equals(Object obj) { 
   
    		if (this == obj)
    			return true;
    		if (obj == null)
    			return false;
    		if (getClass() != obj.getClass())
    			return false;
    		User other = (User) obj;
    		if (age != other.age)
    			return false;
    		if (birthday == null) { 
   
    			if (other.birthday != null)
    				return false;
    		} else if (!birthday.equals(other.birthday))
    			return false;
    		if (pwd == null) { 
   
    			if (other.pwd != null)
    				return false;
    		} else if (!pwd.equals(other.pwd))
    			return false;
    		if (sex == null) { 
   
    			if (other.sex != null)
    				return false;
    		} else if (!sex.equals(other.sex))
    			return false;
    		if (uid != other.uid)
    			return false;
    		if (uname == null) { 
   
    			if (other.uname != null)
    				return false;
    		} else if (!uname.equals(other.uname))
    			return false;
    		return true;
    	}
    	@Override
    	public String toString() { 
   
    		return "User [uid=" + uid + ", uname=" + uname + ", pwd=" + pwd
    				+ ", sex=" + sex + ", age=" + age + ", birthday=" + birthday
    				+ "]";
    	}
    	
    	
    }

UserService.java

 package com.bjsxt.service;
    
    import com.bjsxt.pojo.User;
    
    public interface UserService { 
   
    	/**用户登陆 * * @param uname * @param pwd * @return */
    	User getUserInfoService(String uname, String pwd);
    	
    	/**用户注册 * * @param uname * @param pwd * @param sex * @param age * @param birthday * @return */
    	int getUserInfoService(String uname, String pwd, String sex, int age,
    			String birthday);
    	
    }
    
    
    UserServiceImpl.java
    
    package com.bjsxt.service.impl;
    
    import com.bjsxt.dao.UserDao;
    import com.bjsxt.dao.impl.UserDaoImpl;
    import com.bjsxt.pojo.User;
    import com.bjsxt.service.UserService;
    
    public class UserServiceImpl implements UserService { 
   
    	//创建Dao对象
    	UserDao ud = new UserDaoImpl();
    	
    	
    	@Override
    	public User getUserInfoService(String uname, String pwd) { 
   
    		//处理登录业务
    		return ud.getUserInfoDao(uname,pwd);
    	}
    
    	
    	//用户注册
    	@Override
    	public int getUserInfoService(String uname, String pwd, String sex,
    			int age, String birthday) { 
   
    		//处理注册业务
    		return ud.regUserInfoDao(uname,pwd,sex,age,birthday);
    	}
    
    }

BaseServlet.java

package com.bjsxt.servlet;
    
    import java.io.IOException;
    import java.lang.reflect.Method;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public abstract class BaseServlet extends HttpServlet { 
   
    	@Override
    	protected void service(HttpServletRequest req, HttpServletResponse resp)
    			throws ServletException, IOException { 
   
    		//设置请求、响应编码格式
    		req.setCharacterEncoding("utf-8");
    		resp.setContentType("text/html; charset=utf-8");
    		//获取请求信息
    		String methodName = req.getParameter("method");
    		//处理请求信息(动态调用方法处理请求--》反射)
    			try { 
   
    				//反射方法获取所在类的类对象
    				Class cla = this.getClass();
    				//反射方法获取要被调用的方法对象
    				Method m= cla.getMethod(methodName, HttpServletRequest.class,HttpServletResponse.class);
    				//反射执行的方法
    				m.invoke(this, req,resp);
    			} catch (Exception e) { 
   
    				e.printStackTrace();
    			} 
    	}
    }

DataServlet.java

  package com.bjsxt.servlet;
    
    import java.io.IOException;
    import java.lang.reflect.Method;
    import java.util.Calendar;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    import com.bjsxt.pojo.User;
    import com.bjsxt.service.UserService;
    import com.bjsxt.service.impl.UserServiceImpl;
    
    public  class DataServlet extends BaseServlet { 
   
    	/*@Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //设置请求、响应编码格式 req.setCharacterEncoding("utf-8"); resp.setContentType("text/html; charset=utf-8"); //获取请求信息 String methodName = req.getParameter("method"); //处理请求信息(动态调用方法处理请求--》反射) try { //反射方法获取所在类的类对象 Class cla = this.getClass(); //反射方法获取要被调用的方法对象 Method m= cla.getMethod(methodName, HttpServletRequest.class,HttpServletResponse.class); //反射执行的方法 m.invoke(this, req,resp); } catch (Exception e) { e.printStackTrace(); } }*/
    	
    	
    	//登陆处理方法
    	public void Userlogin(HttpServletRequest req, HttpServletResponse resp) throws IOException { 
   
    		//获取请求信息
    				String uname = req.getParameter("uname");
    				String pwd = req.getParameter("pwd");
    				//处理请求信息
    				System.out.println("DataServlet.Userlogin()"+uname+":"+pwd);
    				
    					//创建业务层对象
    					UserService us = new UserServiceImpl();
    					User u= us.getUserInfoService(uname,pwd);
    					System.out.println("用户查询登陆结果为："+u);
    					
    				//响应处理结果
    					//直接响应 
    					//请求转发
    					
    					//获取session对象
    					HttpSession hs = req.getSession();
    					
    					if (u!=null) { 
   //登陆成功
    						//将用户信息存储到session
    						hs.setAttribute("user", u);
    						
    						//重定向到mian.jsp
    						resp.sendRedirect("/16/main.jsp");
    					}else { 
   //登录失败
    						//将登陆标记添加
    						hs.setAttribute("flag", "loginfalse");
    						//重定向到login.jsp
    						resp.sendRedirect("/16/login.jsp");
    					}
    	}
    	//退出处理方法
    	public void UserOut(HttpServletRequest req, HttpServletResponse resp) throws IOException { 
   
    		//获取请求信息
    		//处理请求信息
    			//获取session、销毁session
    			HttpSession hs = req.getSession();
    			hs.invalidate();
    		//相应处理结果
    			//直接响应
    			//请求转发
    			//重定向
    		resp.sendRedirect("/16/login.jsp");
    		}
    	//注册处理方法
    	public void UserReg(HttpServletRequest req, HttpServletResponse resp) throws IOException { 
   
    		//获取请求信息
    				String uname = req.getParameter("uname");
    				String pwd = req.getParameter("pwd");
    				String sex = req.getParameter("sex");
    				int age =Integer.parseInt(req.getParameter("age")) ;
    				String birthday = req.getParameter("birthday");
    				//处理请求信息
    					//获取业务层对象
    				    UserService us = new UserServiceImpl();
    				     //处理注册
    				    int i=us.getUserInfoService(uname, pwd,sex,age,birthday);
    				    
    				//相应处理结果
    				    //获取session对象
    				    HttpSession hs = req.getSession();
    					//重定向到登陆界面
    				    if(i>0){ 
   
    						//注册成功，添加标记到session
    				    	hs.setAttribute("flag", "regsuccess");
    						resp.sendRedirect("/16/login.jsp");
    					}else{ 
   
    						//重定向到注册页面
    						resp.sendRedirect("/16/login.jsp");
    					}
    	}
    }

DBUtil.java

 package com.bjsxt.util;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.sql.Statement;
    import java.util.Properties;
    
    public class DBUtil { 
   
    	//声明全局变量记录jdbc参数
    	private static String driver;
    	private static String url;
    	private static String username;
    	private static String password;
    	//使用静态代码块，在类加载时即完成对属性文件的读取
    	static{ 
   
    		//动态获取属性配置文件的流对象
    		InputStream in=DBUtil.class.getResourceAsStream("/db.properties");
    		//创建Properties对象
    		Properties p=new Properties();
    		//加载
    		try { 
   
    			p.load(in);//会将属性配置文件的所有数据存储到Properties对象中
    			//将读取的jdbc参数赋值给全局变量
    			driver=p.getProperty("driver");
    			url=p.getProperty("url");
    			username=p.getProperty("username");
    			password=p.getProperty("password");
    			//加载驱动
    			Class.forName(driver);
    		} catch (IOException e) { 
   
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		} catch (ClassNotFoundException e) { 
   
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    	}
    	//创建连接对象并返回
    	public static Connection getConnection(){ 
   
    		Connection conn=null;
    		try { 
   
    			conn = DriverManager.getConnection(url, username, password);
    		} catch (SQLException e) { 
   
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		
    		return conn;
    	}
    	//关闭资源
    	public static void closeAll(ResultSet rs,Statement stmt,Connection conn){ 
   
    		try { 
   
    			if(rs!=null){ 
   
    				rs.close();
    			}
    		} catch (SQLException e1) { 
   
    			// TODO Auto-generated catch block
    			e1.printStackTrace();
    		}
    		try { 
   
    			stmt.close();
    		} catch (SQLException e) { 
   
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		try { 
   
    			conn.close();
    		} catch (SQLException e) { 
   
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		
    		
    	}
    	//封装增加删除修改的通用工具方法
    	/** * @param sql SQL语句 * @param objs SQL语句占位符实参，如果没有参数则传入null * @return 返回增删改的结果，类型为int */
    	public static int executeDML(String sql,Object...objs){ 
   
    		// 声明jdbc变量
    				Connection conn = null;
    				PreparedStatement ps = null;
    				int i = -1;
    				try { 
   
    					// 获取连接对象
    					conn = DBUtil.getConnection();
    					// 开启事务管理
    					conn.setAutoCommit(false);
    					// 创建SQL命令对象
    					ps = conn.prepareStatement(sql);
    					// 给占位符赋值
    					if(objs!=null){ 
   
    						for(int j=0;j<objs.length;j++){ 
   
    							ps.setObject(j+1,objs[j]);
    						}
    					}
    					// 执行SQL
    					i = ps.executeUpdate();
    					conn.commit();
    				} catch (Exception e) { 
   
    					try { 
   
    						conn.rollback();
    					} catch (SQLException e1) { 
   
    						// TODO Auto-generated catch block
    						e1.printStackTrace();
    					}
    					e.printStackTrace();
    				} finally { 
   
    					DBUtil.closeAll(null, ps, conn);
    				}
    				return i;
    	}
    	
    	
    	
    }

db.properties

 driver=com.mysql.jdbc.Driver
 url=jdbc:mysql://localhost:3306/project
 username=root
 password=root

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_2_5.xsd" id="WebApp_ID" version="2.5">
      <display-name>15Progect</display-name>
      <servlet>
        <description>This is the description of my J2EE component</description>
        <display-name>This is the display name of my J2EE component</display-name>
        <servlet-name>UserServlet</servlet-name>
        <servlet-class>com.bjsxt.servlet.UserServlet</servlet-class>
      </servlet>
      <servlet>
        <description>This is the description of my J2EE component</description>
        <display-name>This is the display name of my J2EE component</display-name>
        <servlet-name>OutServlet</servlet-name>
        <servlet-class>com.bjsxt.servlet.OutServlet</servlet-class>
      </servlet>
      <servlet>
        <description>This is the description of my J2EE component</description>
        <display-name>This is the display name of my J2EE component</display-name>
        <servlet-name>RegServlet</servlet-name>
        <servlet-class>com.bjsxt.servlet.RegServlet</servlet-class>
      </servlet>
      <servlet>
        <description>This is the description of my J2EE component</description>
        <display-name>This is the display name of my J2EE component</display-name>
        <servlet-name>DataServlet</servlet-name>
        <servlet-class>com.bjsxt.servlet.DataServlet</servlet-class>
      </servlet>
     
    
      <servlet-mapping>
        <servlet-name>UserServlet</servlet-name>
        <url-pattern>/user</url-pattern>
      </servlet-mapping>
      <servlet-mapping>
        <servlet-name>OutServlet</servlet-name>
        <url-pattern>/out</url-pattern>
      </servlet-mapping>
      <servlet-mapping>
        <servlet-name>RegServlet</servlet-name>
        <url-pattern>/reg</url-pattern>
      </servlet-mapping>
      <servlet-mapping>
        <servlet-name>DataServlet</servlet-name>
        <url-pattern>/data</url-pattern>
  

        </servlet-mapping>
    
      <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>
    </web-app>

info.jsp

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
        <%
        String path = request.getContextPath();
        String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
        %>
    
       
    <!DOCTYPE html>
    <html>
    <head>
      <base href="<%=basePath%>">
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
        <meta name="renderer" content="webkit">
        <title>网站信息</title>  
        <link rel="stylesheet" href="css/pintuer.css">
        <link rel="stylesheet" href="css/admin.css">
        <script src="js/jquery.js"></script>
        <script src="js/pintuer.js"></script>  
    </head>
    <body>
    <div class="panel admin-panel">
      <div><strong><span></span> 网站信息</strong></div>
      <div>
        <form method="post" action="">
          <div>
            <div>
              <label>网站标题：</label>
            </div>
            <div>
              <input type="text" name="stitle" value="" />
              <div></div>
            </div>
          </div>
          <div>
            <div>
              <label>网站LOGO：</label>
            </div>
            <div>
              <input type="text" id="url1" name="slogo" class="input tips" style="width:25%; float:left;" value="" data-toggle="hover" data-place="right" data-image="" />
              <input type="button" class="button bg-blue margin-left" id="image1" value="+ 浏览上传" >
            </div>
          </div>
          <div>
            <div>
              <label>网站域名：</label>
            </div>
            <div>
              <input type="text" name="surl" value="" />
            </div>
          </div>
          <div style="display:none">
            <div>
              <label>副加标题：</label>
            </div>
            <div>
              <input type="text" name="sentitle" value="" />
              <div></div>
            </div>
          </div>
          <div>
            <div>
              <label>网站关键字：</label>
            </div>
            <div>
              <textarea name="skeywords" style="height:80px"></textarea>
              <div></div>
            </div>
          </div>
          <div>
            <div>
              <label>网站描述：</label>
            </div>
            <div>
              <textarea name="sdescription"></textarea>
              <div></div>
            </div>
          </div>
          <div>
            <div>
              <label>联系人：</label>
            </div>
            <div>
              <input type="text" name="s_name" value="" />
              <div></div>
            </div>
          </div>
          <div>
            <div>
              <label>手机：</label>
            </div>
            <div>
              <input type="text" name="s_phone" value="" />
              <div></div>
            </div>
          </div>
          <div>
            <div>
              <label>电话：</label>
            </div>
            <div>
              <input type="text" name="s_tel" value="" />
              <div></div>
            </div>
          </div>
          <div style="display:none;">
            <div>
              <label>400电话：</label>
            </div>
            <div>
              <input type="text" name="s_400" value="" />
              <div></div>
            </div>
          </div>
          <div>
            <div>
              <label>传真：</label>
            </div>
            <div>
              <input type="text" name="s_fax" value="" />
              <div></div>
            </div>
          </div>
          <div>
            <div>
              <label>QQ：</label>
            </div>
            <div>
              <input type="text" name="s_qq" value="" />
              <div></div>
            </div>
          </div>
          <div style="display:none">
            <div>
              <label>QQ群：</label>
            </div>
            <div>
              <input type="text" name="s_qqu" value="" />
              <div></div>
            </div>
          </div>
         
          <div>
            <div>
              <label>Email：</label>
            </div>
            <div>
              <input type="text" name="s_email" value="" />
              <div></div>
            </div>
          </div>
          <div>
            <div>
              <label>地址：</label>
            </div>
            <div>
              <input type="text" name="s_address" value="" />
              <div></div>
            </div>
          </div>  
                  
          <div>
            <div>
              <label>底部信息：</label>
            </div>
            <div>
              <textarea name="scopyright" style="height:120px;"></textarea>
              <div></div>
            </div>
          </div>
          <div>
            <div>
              <label></label>
            </div>
            <div>
              <button class="button bg-main icon-check-square-o" type="submit"> 提交</button>
            </div>
          </div>
        </form>
      </div>
    </div>
    </body></html>

login.jsp

  <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %> 
     
     <!DOCTYPE html>
    <html>
    <head>
    <base href="<%=basePath%>">
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
        <meta name="renderer" content="webkit">
        <title>登录</title>  
        <link rel="stylesheet" href="css/pintuer.css">
        <link rel="stylesheet" href="css/admin.css">
        <script src="js/jquery.js"></script>
        <script src="js/pintuer.js"></script>  
    </head>
    <body>
    <div></div>
    <div>
        <div class="line bouncein">
            <div class="xs6 xm4 xs3-move xm4-move">
                <div style="height:150px;"></div>
                <div class="media media-y margin-big-bottom">           
                </div>         
                <form action="data" method="get">
                
                <!-- 声明处理请求的方法 -->
                <input type="hidden" name="method" value="Userlogin" />
                <div class="panel loginbox">
                    <div class="text-center margin-big padding-big-top"><h1>chy超级管理系统</h1></div>
                    
                    <!-- 声明java代码块 -->
                    <% 
                    //获取session中的标记
                    Object obj =session.getAttribute("flag"); 
                    if(obj!=null){ 
                    if("loginfalse".equals((String)obj)){ %>
                    <div style="text-align:center;color:red"; ><h1>用户名或密码错误</h1></div>
                  <%
                     }else if("regsuccess".equals((String)obj)){
                  %>
                <div style="text-align:center;color:red"; ><h1>新用户注册成功</h1></div>
                   <%
                    }
                    }
                    session.invalidate();/* 销毁session */
                    %>
                    
                    <div style="padding:30px; padding-bottom:10px; padding-top:10px;">
                        <div>
                            <div class="field field-icon-right">
                                <input type="text" class="input input-big" name="uname" placeholder="登录账号" data-validate="required:请填写账号" />
                                <span class="icon icon-user margin-small"></span>
                            </div>
                        </div>
                        <div>
                            <div class="field field-icon-right">
                                <input type="password" class="input input-big" name="pwd" placeholder="登录密码" data-validate="required:请填写密码" />
                                <span class="icon icon-key margin-small"></span>
                            </div>
                        </div>
                        <div>
                            <div>
                                <input type="text" class="input input-big" name="code" placeholder="填写右侧的验证码" data-validate="required:请填写右侧的验证码" />
                               <img src="images/passcode.jpg" alt="" width="100" height="32" style="height:43px;cursor:pointer;" onclick="this.src=this.src+'?'">  
                                                       
                            </div>
                        </div>
                    </div>
                    <div style="padding:30px;"><input type="submit" class="button button-block bg-main text-big input-big" value="登录"></div>
                    <div style="font-size:20px; position:relative;left:300px;top:-20px"><a href="reg.jsp">注册</a></div>
                </div>
                </form>          
            </div>
        </div>
    </div>
    
    </body>
    </html>

main.jsp

 <%@page import="com.bjsxt.pojo.User"%>
    <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
        
    <!DOCTYPE html>
    <html>
    <head>
    <base href="<%=basePath%>">
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
        <meta name="renderer" content="webkit">
        <title>chy参与管理系统修改</title>  
        <link rel="stylesheet" href="css/pintuer.css">
        <link rel="stylesheet" href="css/admin.css">
        <script src="js/jquery.js"></script>   
        
        <script type="text/javascript"> //给退出登陆添加单击事件，通过id选择器 $(function(){ 
      $("#out").click(function(){ 
      return window.confirm("你需要退出登陆吗?") }) }) </script>
    </head>
    <body style="background-color:#f2f9fd;">
    <div class="header bg-main" style="border:solid 1px">
      <div class="logo margin-big-left fadein-top">
        <h1><img src="images/y.jpg" class="radius-circle rotate-hover" height="50" alt="" />chy超级管理系统</h1>
      </div>
      
      
      <!-- 加入欢迎用户登陆的界面 span行内标签-->
      <!-- 加边框 -->
      <div style="position:relative;left:900px"><span style="font-size:20px;color:white;"> 欢迎:<%=( (User)session.getAttribute("user")).getUname() %>进入系统</span> &nbsp;&nbsp; <a id="out" class="button button-little bg-red" href="data?method=UserOut"><span></span> 退出登录</a> </div>
    
    </div>
    <div>
      <div><strong><span></span>菜单列表</strong></div>
      <h2><span></span>基本设置</h2>
      <ul style="display:block">
        <li><a href="info.html" target="right"><span></span>网站设置</a></li>
        <li><a href="pass.html" target="right"><span></span>修改密码</a></li>
        <li><a href="page.html" target="right"><span></span>单页管理</a></li>  
        <li><a href="adv.html" target="right"><span></span>首页轮播</a></li>   
        <li><a href="book.html" target="right"><span></span>留言管理</a></li>     
        <li><a href="column.html" target="right"><span></span>栏目管理</a></li>
      </ul>   
      <h2><span></span>栏目管理</h2>
      <ul>
        <li><a href="list.html" target="right"><span></span>内容管理</a></li>
        <li><a href="add.html" target="right"><span></span>添加内容</a></li>
        <li><a href="cate.html" target="right"><span></span>分类管理</a></li>        
      </ul>  
    </div>
    <script type="text/javascript"> $(function(){ 
      $(".leftnav h2").click(function(){ 
      $(this).next().slideToggle(200); $(this).toggleClass("on"); }) $(".leftnav ul li a").click(function(){ 
      $("#a_leader_txt").text($(this).text()); $(".leftnav ul li a").removeClass("on"); $(this).addClass("on"); }) }); </script>
    <ul>
      <li><a href="{:U('Index/info')}" target="right"> 首页</a></li>
      <li><a href="##" id="a_leader_txt">网站信息</a></li>
      <li><b>当前语言：</b><span style="color:red;">中文</php></span>
      &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;切换语言：<a href="##">中文</a> &nbsp;&nbsp;<a href="##">英文</a> </li>
    </ul>
    <div>
      <iframe scrolling="auto" rameborder="0" src="info.jsp" name="right" width="100%" height="100%"></iframe>
    </div>
    <div style="text-align:center;">
    </div>
    </body>
    </html>

reg.jsp

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    
    <!DOCTYPE html>
    <html>
    <head>
    <base href="<%=basePath%>">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
    <meta name="renderer" content="webkit">
    <title></title>
    <link rel="stylesheet" href="css/pintuer.css">
    <link rel="stylesheet" href="css/admin.css">
    <script src="js/jquery.js"></script>
    <script src="js/pintuer.js"></script>
    </head>
    <body>
    <div class="panel admin-panel">
      <div><strong><span></span>新用户注册 </strong></div>
      <div>
        <form method="post" action="data">
        <input type="hidden" name="method" value="UserReg" />
               
          <div>
            <div>
              <label for="sitename">用户名：</label>
            </div>
            <div>
              <input type="text" class="input w50" id="mpass" name="uname" size="50" placeholder="请输入新用户名" data-validate="required:请输入原始密码" />       
            </div>
          </div>      
          <div>
            <div>
              <label for="sitename">新密码：</label>
            </div>
            <div>
              <input type="password" class="input w50" name="pwd" size="50" placeholder="请输入新密码" data-validate="required:请输入新密码,length#>=5:新密码不能小于5位" />         
            </div>
          </div>
          <div>
            <div>
              <label for="sitename">确认新密码：</label>
            </div>
            <div>
              <input type="password" class="input w50" name="" size="50" placeholder="请再次输入新密码" data-validate="required:请再次输入新密码,repeat#pwd:两次输入的密码不一致" />          
            </div>
          </div>
           <div style="position:relative;left:100px; top:-10px">
           性别：男<input type="radio" name="sex" value="男" checked="checked">女<input type="radio" name="sex" value="女" >
           </div>
           <!-- 年龄 -->
           <div>
            <div>
              <label for="sitename">年龄：</label>
            </div>
            <div>
              <input type="text" class="input w50" id="mpass" name="age" size="50" placeholder="请输入年龄" />       
            </div>
          </div>      
            <!-- 出生日期 -->
          <div>
            <div>
              <label for="sitename">出生日期：</label>
            </div>
            <div>
              <input type="date" class="input w50" id="mpass" name="birthday" size="50" />       
            </div>
            
          </div>      
          <div>
            <div>
              <label></label>
            </div>
            <div>
              <button class="button bg-main icon-check-square-o" type="submit"> 提交</button>   
            </div>
          </div>      
        </form>
      </div>
    </div>
    </body></html>

运行结果

在这里插入图片描述

四、bug以及心得体会

1、bug：由于粗心引起的bug，均已改正。

2、心得与体会

很多时候出现的bug，都是因为自己粗心所导致的。例如页面无法跳转多半是因为重定向的路径没有写对、或者form表单的action没写对、亦或是href后的路径没有写对，要特别注意。

​在一开始时，每个请求或独立的业务逻辑（登陆、退出、注册）都要单独使用一个Servlet进行处理。但随着网站功能的增多，Servlet增多导致资源浪费，需要我们进一步的优化。使用反射动态调用其功能处理方法，并将相关的Servlet集成在一个Servlet上。

虽然使用了反射集成了一个独立的业务逻辑，但是反射不会只使用一次，需要我们在一些Servlet中的service方法中的反射代码声明一遍，然后使用时直接继承声明该反射代码的类。而且，该类最好不能被访问到（删除相应的url-pattern），最好不能被实例化（声明为抽象类）。

​刚接触JavaEE项目，需要掌握的知识点很多而且很杂，学起来比较吃力。但是这些零碎的知识点恰恰是今后做项目的基础。我还在不断花费时间去吸收、去归纳这些知识，相信通过本次的学习，我能够更加轻松的掌握这些知识！

五、项目源码及压缩包

关注后私信回复 [ servlet ], 即可获取源码哦~~~
基于Jsp和Servlet的简单项目[通俗易懂]

https://pan.baidu.com/s/1ylOi3PXFy6nwoOyVGVrBeg?pwd=yvsn

​

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