package luju.me.teach.struts2.login; 
import javax.servlet.http.Cookie; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import javax.servlet.http.HttpSession; 
import org.apache.commons.lang.StringUtils; 
import org.apache.struts2.ServletActionContext; 
import com.opensymphony.xwork2.Action; 
/** 
* @author 魯炬 http://luju.me 
* 
*/ 
public class LoginAction { 
private String loginname; 
private String password; 
private String msg; 
public String getMsg() { 
return msg; 
} 
public void setMsg(String msg) { 
this.msg = msg; 
} 
public String getLoginname() { 
return loginname; 
} 
public void setLoginname(String loginname) { 
this.loginname = loginname; 
} 
public String getPassword() { 
return password; 
} 
public void setPassword(String password) { 
this.password = password; 
} 
/** 用戶登陸 */ 
public String login() { 
if(StringUtils.isBlank(this.loginname)) { 
return Action.INPUT; 
} 
/* 
這里寫你自己通過用戶名查找用戶信息的業(yè)務邏輯 
比如：使用手機號登陸 
Citizen user = prmService.queryEGovCitizenByMobile(this.loginname); 
.... 
*/ 
if(user == null || user.getPwd() == null || !user.getPwd().getValue().equals(this.password)) { 
//登陸失敗 
this.msg = "用戶不存在或密碼錯誤！"; 
return Action.INPUT; 
} else { 
//登陸成功 
//設置session 
this.getSession().setAttribute("_USER_INFO_LOGIN_NAME_", this.loginname); 
this.getSession().setAttribute("_USER_INFO_USER_ID_", user.getId().getValue()); 
this.getSession().setAttribute("_USER_INFO_USER_INFO_", user); 
//設置cookie 
this.getResponse().addCookie(new Cookie("_USER_INFO_LOGIN_NAME_", this.loginname)); 
this.getResponse().addCookie(new Cookie("_USER_INFO_USER_ID_", user.getId().getValue())); 
return Action.SUCCESS; 
} 
} 
/** 
* 注銷 
*/ 
public String loginout() { 
//清空session 
this.getSession().invalidate(); 
return Action.SUCCESS; 
} 
public HttpSession getSession() { 
return ServletActionContext.getRequest().getSession(); 
} 
public HttpServletRequest getRequest() { 
return ServletActionContext.getRequest(); 
} 
public HttpServletResponse getResponse() { 
return ServletActionContext.getResponse(); 
} 
}

struts.xml：struts的配置文件

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> 
<struts> 
<package name="common" namespace="/common"> 
<action name="login" class="luju.me.site.common.action.LoginAction" 
method="login"> 
<result name="input">login.jsp</result> 
<result name="success" type="redirect">/page.jsp</result> 
</action> 
<action name="loginout" class="luju.me.site.common.action.LoginAction" 
method="loginout"> 
<result name="success" type="redirect">login.action</result> 
</action> 
</package> 
</struts>

login.jsp：用戶登陸頁面，用戶輸入用戶名和密碼，如果登陸失敗顯示失敗信息。

<%@ page language="java" pageEncoding="UTF-8"%> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>歡迎登錄</title> 
</head> 
<body> 
<div id="login"> 
<span>${msg}</span> 
<form name="form1" method="post" action="<c:url value="/common/login.action" />" > 
<span> 
<label>用戶名：</label> 
<input name="loginname" id="loginname" type="text" value="admin" /> 
</span> 
<span> 
<label>密碼：</label> 
<input type="password" name="password" id="password" value="123"/> 
</span> 
<span> 
<input type="submit" value="登陸" /> 
</span> 
</form> 
</div> 
</body> 
</html>

page.jsp：登陸成功后顯示用戶信息。

<%@ page language="java" pageEncoding="UTF-8"%> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 
<% 
boolean isLogin = false; 
String loginName = (String)request.getSession().getAttribute("_USER_INFO_LOGIN_NAME_"); 
if(loginName != null && !"".equals(loginName)){ 
isLogin = true; 
} 
request.setAttribute("isLogin",isLogin); 
request.setAttribute("loginName",loginName); 
%> 
<c:if test="${isLogin}"> 
你好：${loginName} 
&nbsp;&nbsp; 
<a href="<c:url value="/common/loginout.action" />">注銷</a> 
</c:if> 
<c:if test="${!isLogin}"> 
<form name="login_form" method="post" action="<c:url value="/common/login.action" />" > 
<span> 
<label>手機號：</label> 
<input name="loginname" id="loginname" type="text" value="" /> 
</span> 
<span> 
<label>密碼：</label> 
<input type="password" name="password" id="password" value=""/> 
</span> 
<span> 
<input type="submit" value="登陸" /> 
</span> 
</form> 
</c:if>

以上所述是小編給大家介紹的Java Web用戶登錄實例代碼，希望對大家有所幫助！

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