JAVA_WEB项目（结合Servlet+jsp+ckEditor编辑器+jquery easyui技术）实现新闻发布管理系统第二篇：登陆和注销功能实现

上一篇介绍了JAVA_WEB项目之新闻发布管理系统第一篇：前期环境准备，接下来是实现该系统的登陆和注销的功能。

下面就直接给出登陆界面的form表单提交的内容：

%String root=request.getContextPath(); %><FORM id="form1" name="form1" onsubmit="javascript:return WebForm_OnSubmit();" action="<%=root%>/UserAction?action=Login"  method="post"><SCRIPT type=text/javascript></SCRIPT><SCRIPT src="login_files/WebResource.axd" type=text/javascript></SCRIPT><SCRIPT src="login_files/WebResource(1).axd" type=text/javascript></SCRIPT><SCRIPT src="login_files/ScriptResource.axd" type=text/javascript></SCRIPT><SCRIPT src="login_files/ScriptResource(1).axd" type=text/javascript></SCRIPT><SCRIPT type=text/javascript>function WebForm_OnSubmit() {if (typeof(ValidatorOnSubmit) == "function" && ValidatorOnSubmit() == false) return false;return true;  }</SCRIPT><SCRIPT type=text/javascript></SCRIPT><DIV id=UpdatePanel1><DIV id=div1 style="LEFT: 0px; POSITION: absolute; TOP: 0px; BACKGROUND-COLOR: #0066ff"></DIV><DIV id=div2 style="LEFT: 0px; POSITION: absolute; TOP: 0px; BACKGROUND-COLOR: #0066ff"></DIV><SCRIPT language=JavaScript> var speed=20;var temp=new Array(); var clipright=document.body.clientWidth/2,clipleft=0 for (i=1;i<=2;i++){ temp[i]=eval("document.all.div"+i+".style");temp[i].width=document.body.clientWidth/2;temp[i].height=document.body.clientHeight;temp[i].left=(i-1)*parseInt(temp[i].width);} function openit(){ clipright-=speed;temp[1].clip="rect(0 "+clipright+" auto 0)";clipleft+=speed;temp[2].clip="rect(0 auto auto "+clipleft+")";if (clipright<=0)clearInterval(tim);} tim=setInterval("openit()",100);                </SCRIPT><DIV>   </DIV><DIV><TABLE cellSpacing=0 cellPadding=0 width=900 align=center border=0>  <TBODY>  <TR>    <TD style="HEIGHT: 105px"><IMG src="login_files/login_1.gif"   border=0></TD></TR>  <TR>    <TD background=login_files/login_2.jpg height=300>      <TABLE height=300 cellPadding=0 width=900 border=0>        <TBODY>        <TR>          <TD colSpan=2 height=35></TD></TR>        <TR>          <TD width=360></TD>          <TD>            <TABLE cellSpacing=0 cellPadding=2 border=0>              <TBODY>              <TR>                <TD style="HEIGHT: 28px" width=80>登 录 名：</TD>                <TD style="HEIGHT: 28px" width=150><INPUT id=txtName                   style="WIDTH: 130px" name=username></TD>                <TD style="HEIGHT: 28px" width=370><SPAN                   id=RequiredFieldValidator3                   style="FONT-WEIGHT: bold; VISIBILITY: hidden; COLOR: white">请输入登录名</SPAN></TD></TR>              <TR>                <TD style="HEIGHT: 28px">登录密码：</TD>                <TD style="HEIGHT: 28px"><INPUT id=txtPwd style="WIDTH: 130px"                   type=password name=password></TD>                <TD style="HEIGHT: 28px"><SPAN id=RequiredFieldValidator4                   style="FONT-WEIGHT: bold; VISIBILITY: hidden; COLOR: white">请输入密码</SPAN></TD></TR>                <TD style="HEIGHT: 18px"></TD>                <TD style="HEIGHT: 18px"></TD>                <TD style="HEIGHT: 18px"></TD></TR>              <TR>                <TD></TD>                <TD><INPUT id=btn                   style="BORDER-TOP-WIDTH: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; BORDER-RIGHT-WIDTH: 0px"                   onclick='javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("btn", "", true, "", "", false, false))'                   type=image src="login_files/login_button.gif" name=btn>               </TD></TR>               <td></td><td>${message}</td>              </TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR>    <TD><IMG src="login_files/login_3.jpg" border=0></TD></TR> </TBODY></TABLE></DIV></DIV><SCRIPT type=text/javascript><!--var Page_Validators =  new Array(document.getElementById("RequiredFieldValidator3"), document.getElementById("RequiredFieldValidator4"));// --></SCRIPT>

表单提交到后台的查看登陆名和密码的相关代码：

首先贴出解决全局网站编码的过滤

实体User：

package com.news.domain;public class User {private Integer user_id;private String username;private String password;public Integer getUser_id() {return user_id;}public void setUser_id(Integer user_id) {this.user_id = user_id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public User(Integer user_id, String username, String password) {super();this.user_id = user_id;this.username = username;this.password = password;}public User() {super();// TODO Auto-generated constructor stub}}

Controlle层：

package com.news.action;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import com.news.domain.User;import com.news.service.UserService;public class UserAction extends BaseAction{private UserService service=new UserService(); public void Login(HttpServletRequest request,HttpServletResponse response){service.findUser(request, response);}public void Exit(HttpServletRequest request,HttpServletResponse response){        try {        HttpSession session= request.getSession(false);        User user= (User) session.getAttribute("user");            if(user!=null){            session.removeAttribute("user");            }response.getWriter().write("<script>window.parent.location.href='"+request.getContextPath() +"/login.jsp"+"';</script>");} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

package com.news.service;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.news.dao.UserDao;import com.news.domain.User;public class UserService {private UserDao userDao=new UserDao();public void findUser(HttpServletRequest request,HttpServletResponse response){User user= new User();user.setUsername(request.getParameter("username"));user.setPassword(request.getParameter("password"));System.out.println(user.getPassword()+","+user.getUsername());User uu = null;try{if(user!=null){uu=userDao.find(user);if(uu==null){request.setAttribute("message", "用户名或密码错误");request.getRequestDispatcher("/login.jsp").forward(request, response);return;}   request.getSession().setAttribute("user", uu);   request.getRequestDispatcher("/WEB-INF/jsps/index.jsp").forward(request, response);}}    catch (Exception e) {    throw new RuntimeException(e);}}}

service层：

package com.news.service;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.news.dao.UserDao;import com.news.domain.User;public class UserService {private UserDao userDao=new UserDao();public void findUser(HttpServletRequest request,HttpServletResponse response){User user= new User();user.setUsername(request.getParameter("username"));user.setPassword(request.getParameter("password"));System.out.println(user.getPassword()+","+user.getUsername());User uu = null;try{if(user!=null){uu=userDao.find(user);if(uu==null){request.setAttribute("message", "用户名或密码错误");request.getRequestDispatcher("/login.jsp").forward(request, response);return;}   request.getSession().setAttribute("user", uu);   request.getRequestDispatcher("/WEB-INF/jsps/index.jsp").forward(request, response);}}    catch (Exception e) {    throw new RuntimeException(e);}}}

dao层：

package com.news.dao;import java.sql.Connection;import java.sql.SQLException;import org.apache.commons.dbutils.DbUtils;import org.apache.commons.dbutils.QueryRunner;import org.apache.commons.dbutils.handlers.BeanHandler;import com.news.domain.User;import com.news.utils.JdbcUtils;public class UserDao {public User find(User user) {Connection conn=null;try {conn=JdbcUtils.getConnection();QueryRunner runner=new QueryRunner();String sql="select * from tb_user where username=? and password=?";Object[] params={user.getUsername(),user.getPassword()};User u = (User) runner.query(conn, sql, params, new BeanHandler(User.class));return u;} catch (SQLException e) {throw new RuntimeException(e);}finally{DbUtils.closeQuietly(conn);}}}

登陆功能和注销的主要代码就在上面，接下来实现新闻发布，新闻修改，新闻删除功能的实现。整个系统的源码会在最后一篇介绍的博文中贴出下载链接。