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Struts 拦截器权限控制【通过拦截器实现登录后跳转到登录前页面】
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應(yīng)用情形：在web項目中，經(jīng)常會遇到用戶未登錄或SESSION失效時用戶發(fā)出非法的權(quán)限操作，如新聞的評論、文件的下載等等，在此我們可以使用struts攔截器對該用戶發(fā)出的請求進(jìn)行攔截，攔截后判斷用戶是否登錄或SESSION是否有效，然后進(jìn)行其正常操作。具體實例如下：
新建一個攔截器類UserInterceptor ，UserInterceptor.java代碼如下
[java] view plaincopyprint?
package?com.hsinghsu.test.interceptor;????import?com.opensymphony.xwork2.*;??import?com.opensymphony.xwork2.interceptor.AbstractInterceptor;??import?java.util.*;??import?javax.servlet.http.HttpServletRequest;??import?org.apache.struts2.ServletActionContext;????public?class?UserInterceptor?extends?AbstractInterceptor?{????????private?static?final?long?serialVersionUID?=?4956767125951165062L;??????????????public?String?intercept(ActionInvocation?invocation)?throws?Exception?{??????????????????????ActionContext?ctx?=?invocation.getInvocationContext();??????????Map<String,?Object>?session?=?ctx.getSession();????????????????????String?user?=?(String)?session.get("user");??????????????????????if?(user?!=?null?&&?user.equals("hsing"))?{??????????????return?invocation.invoke();??????????}??????????????????????HttpServletRequest?req?=?ServletActionContext.getRequest();??????????????????????String?path?=?req.getRequestURI();??????????System.out.println("path:"?+?path);????????????????????session.put("prePage",?path);??????????????????????ctx.put("tip",?"您還沒有登錄，請輸入hsing,hsu登錄系統(tǒng)");??????????????????????return?"login";??????}??}??
package com.hsinghsu.test.interceptor;import com.opensymphony.xwork2.*;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import java.util.*;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;public class UserInterceptor extends AbstractInterceptor {private static final long serialVersionUID = 4956767125951165062L;// 攔截Action處理的攔截方法public String intercept(ActionInvocation invocation) throws Exception {// 取得請求相關(guān)的ActionContext實例ActionContext ctx = invocation.getInvocationContext();Map<String, Object> session = ctx.getSession();// 取出名為user的Session屬性String user = (String) session.get("user");// 如果已經(jīng)登錄，放行if (user != null && user.equals("hsing")) {return invocation.invoke();}// 獲取HttpServletRequest對象HttpServletRequest req = ServletActionContext.getRequest();// 獲取此請求的地址String path = req.getRequestURI();System.out.println("path:" + path);// 存入session，方便調(diào)用session.put("prePage", path);// 沒有登錄，將服務(wù)器提示設(shè)置成一個HttpServletRequest屬性ctx.put("tip", "您還沒有登錄，請輸入hsing,hsu登錄系統(tǒng)");// 直接返回login的邏輯視圖return "login";}
}新建登錄action，LoginAction.java代碼如下：
[java] view plaincopyprint?
package?com.hsinghsu.test.action;????import?com.opensymphony.xwork2.ActionSupport;??import?com.opensymphony.xwork2.ActionContext;????import?java.util.*;????public?class?LoginAction?extends?ActionSupport?{????????private?static?final?long?serialVersionUID?=?8013816027944871760L;??????private?String?username;??????private?String?password;??????private?String?prePage;????????public?String?execute()?throws?Exception?{????????????????????if?(null?!=?username?&&?null?!=?password?&&?username.equals("hsing")?&&?password.equals("hsu"))?{????????????????ActionContext?ctx?=?ActionContext.getContext();??????????????Map<String,?Object>?session?=?ctx.getSession();??????????????????????????????????????????session.put("user",?getUsername());??????????????????????????????prePage?=?(String)?session.get("prePage");??????????????????????????????session.remove("prePage");????????????????if?(null?==?prePage)?{??????????????????return?"usercenter";??????????????}?else?{??????????????????return?SUCCESS;??????????????}????????????}?else?{??????????????return?INPUT;??????????}??????}????????public?void?setUsername(String?username)?{??????????this.username?=?username;??????}????????public?String?getUsername()?{??????????return?this.username;??????}????????public?void?setPassword(String?password)?{??????????this.password?=?password;??????}????????public?String?getPassword()?{??????????return?this.password;??????}????????public?String?getPrePage()?{??????????return?prePage;??????}????????public?void?setPrePage(String?prePage)?{??????????this.prePage?=?prePage;??????}??}??
package com.hsinghsu.test.action;import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ActionContext;import java.util.*;public class LoginAction extends ActionSupport {private static final long serialVersionUID = 8013816027944871760L;private String username;// 登錄用戶名private String password;// 登錄密碼private String prePage;// 登錄前頁面public String execute() throws Exception {if (null != username && null != password && username.equals("hsing") && password.equals("hsu")) {ActionContext ctx = ActionContext.getContext();Map<String, Object> session = ctx.getSession();//保存用戶信息sessionsession.put("user", getUsername());// 獲取跳轉(zhuǎn)到登陸界面之前的頁面地址，由攔截器提供prePage = (String) session.get("prePage");// 清除session中的數(shù)據(jù)session.remove("prePage");if (null == prePage) {return "usercenter";// 不是攔截器跳轉(zhuǎn)到登陸頁面的，直接訪問的登陸頁面} else {return SUCCESS;// 是攔截器跳轉(zhuǎn)到登陸登錄前頁面}} else {return INPUT;}}public void setUsername(String username) {this.username = username;}public String getUsername() {return this.username;}public void setPassword(String password) {this.password = password;}public String getPassword() {return this.password;}public String getPrePage() {return prePage;}public void setPrePage(String prePage) {this.prePage = prePage;}
}配置攔截器與action映射關(guān)系，struts.xml代碼如下：
[html] view plaincopyprint?
<?xml?version="1.0"?encoding="UTF-8"?>??<!DOCTYPE?struts?PUBLIC??????"-//Apache?Software?Foundation//DTD?Struts?Configuration?2.1.7//EN"??????"http://struts.apache.org/dtds/struts-2.1.7.dtd">??<struts>??????<constant?name="struts.custom.i18n.resources"?value="globalMessages"?/>??????<constant?name="struts.i18n.encoding"?value="UTF-8"?/>????????<package?name="hsinghsu"?extends="struts-default">??????????????????????????<interceptors>??????????????<interceptor?name="userInterceptor"?class="com.hsinghsu.test.interceptor.UserInterceptor"?/>??????????</interceptors>??????????????????????<global-results>??????????????<result?name="login">/jsp/login.jsp</result>??????????</global-results>????????????<action?name="loginPro"?class="com.hsinghsu.test.action.LoginAction">??????????????<result?name="success"?type="redirectAction">${prePage}</result>??????????????<result?name="input">/jsp/login.jsp</result>??????????????<result?name="usercenter">/jsp/userCenter.jsp</result>??????????</action>????????????????????<action?name="productList">??????????????<result?name="success">/jsp/productList.jsp</result>??????????????<interceptor-ref?name="defaultStack"?/>???????????????<interceptor-ref?name="userInterceptor"?/>???????????</action>????????????????</package>??</struts>??
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN""http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts><constant name="struts.custom.i18n.resources" value="globalMessages" /><constant name="struts.i18n.encoding" value="UTF-8" /><package name="hsinghsu" extends="struts-default"><!-- 用戶攔截器定義 --><interceptors><interceptor name="userInterceptor" class="com.hsinghsu.test.interceptor.UserInterceptor" /></interceptors><!-- 定義全局result --><global-results><result name="login">/jsp/login.jsp</result></global-results><action name="loginPro" class="com.hsinghsu.test.action.LoginAction"><result name="success" type="redirectAction">${prePage}</result><result name="input">/jsp/login.jsp</result><result name="usercenter">/jsp/userCenter.jsp</result></action><action name="productList"><result name="success">/jsp/productList.jsp</result><interceptor-ref name="defaultStack" /> <!-- 默認(rèn)攔截器 --><interceptor-ref name="userInterceptor" /> <!-- 應(yīng)用自定義攔截器 --></action></package>
</struts>登錄頁面login.jsp代碼如下：
[html] view plaincopyprint?
<%@?page?contentType="text/html;?charset=utf-8"?language="java"??????errorPage=""%>??<%@?taglib?prefix="s"?uri="/struts-tags"%>??<!DOCTYPE?html?PUBLIC?"-//W3C//DTD?XHTML?1.0?Transitional//EN"??????"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">??<html?xmlns="http://www.w3.org/1999/xhtml">??<head>??<title>登錄頁面</title>??</head>??<body>??????<h3>用戶登錄</h3>??????${tip}??????<s:form?action="loginPro">??????????<s:textfield?name="username"?label="用戶名"?/>??????????<s:password?name="password"?label="密碼"?/>??????????<s:submit?value="登錄"?/>??????</s:form>??</body>??</html>??
<%@ page contentType="text/html; charset=utf-8" language="java"errorPage=""%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>登錄頁面</title>
</head>
<body><h3>用戶登錄</h3>${tip}<s:form action="loginPro"><s:textfield name="username" label="用戶名" /><s:password name="password" label="密碼" /><s:submit value="登錄" /></s:form>
</body>
</html>產(chǎn)品列表頁面productList.jsp代碼如下：
[html] view plaincopyprint?
<%@?page?contentType="text/html;?charset=utf-8"?language="java"??????errorPage=""%>??<!DOCTYPE?html?PUBLIC?"-//W3C//DTD?XHTML?1.0?Transitional//EN"??????"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">??<html?xmlns="http://www.w3.org/1999/xhtml">??<head>??<title>產(chǎn)品列表</title>??</head>??<body>??????<h2>水果：</h2>??????蘋果<br/>?橘子<br/>?香蕉<br/>??</body>??</html>??
<%@ page contentType="text/html; charset=utf-8" language="java"errorPage=""%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>產(chǎn)品列表</title>
</head>
<body><h2>水果：</h2>蘋果<br/> 橘子<br/> 香蕉<br/>
</body>
</html>
用戶中心userCenter.jsp代碼如下：
[html] view plaincopyprint?
<%@?page?contentType="text/html;?charset=utf-8"?language="java"??????errorPage=""%>??<%@?taglib?prefix="s"?uri="/struts-tags"%>??<!DOCTYPE?html?PUBLIC?"-//W3C//DTD?XHTML?1.0?Transitional//EN"??????"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">??<html?xmlns="http://www.w3.org/1999/xhtml">??<head>??<title>成功頁面</title>??</head>??<body>個人用戶中心，您已經(jīng)登錄!??</body>??</html>??
<%@ page contentType="text/html; charset=utf-8" language="java"errorPage=""%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>成功頁面</title>
</head>
<body>個人用戶中心，您已經(jīng)登錄!
</body>
</html>驗證：
情形一：若用戶未登錄，輸入http://localhost:8686/testInterceptor/productList.action
則系統(tǒng)會自動跳轉(zhuǎn)到login.jsp頁面，進(jìn)行用戶登錄，登錄后系統(tǒng)會自動跳到productList.jsp前臺展現(xiàn)頁面。
情形二：若用戶已登錄，輸入http://localhost:8686/testInterceptor/productList.action
則系統(tǒng)直接跳轉(zhuǎn)到productList.jsp前臺展現(xiàn)頁面。
情形三：若用戶未登錄，輸入http://localhost:8686/testInterceptor/testInterceptor/loginPro.action
則系統(tǒng)會自動跳轉(zhuǎn)到login.jsp頁面，進(jìn)行用戶登錄，登錄后系統(tǒng)會自動跳到userCenter.jsp前臺展現(xiàn)頁面。
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