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 block
e.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。