在struts2中使用攔截器（Interceptor）控制登錄和權限

原創 prostore 2018-08-27 06:52

在jsp servlet中我們通常使用Servlet Filter控制用戶是否登入， 是否有權限轉到某個頁面。在struts2中我們應該會想到他的攔截器（Interceptor）， Interceptor在struts2中起着非常重要的作用。 很多struts2中的功能都是使用Interceptor實現的。

需求：簡單的登入界面，讓用戶輸入用戶名、密碼、記住密碼（remember me）。 如果用戶選中remember me的話， 下次就不需要再登入了（使用cookie實現， 用需要點擊logout取消remeber me功能）。 如果用戶起始輸入的地址不是登入頁面的話，在用戶登入之後需要轉到用戶輸入的起始地址。

我們先看看LoginInterceptor.java

Java代碼
  1. package com.javaeye.dengyin2000.wallet.interceptor;   
  2.   
  3. import java.util.Map;   
  4.   
  5. import javax.servlet.http.Cookie;   
  6. import javax.servlet.http.HttpServletRequest;   
  7.   
  8. import org.apache.commons.lang.StringUtils;   
  9. import org.apache.struts2.StrutsStatics;   
  10.   
  11. import com.javaeye.dengyin2000.wallet.dao.UserDAO;   
  12. import com.javaeye.dengyin2000.wallet.dao.UserNotFoundException;   
  13. import com.javaeye.dengyin2000.wallet.domains.User;   
  14. import com.opensymphony.xwork2.ActionContext;   
  15. import com.opensymphony.xwork2.ActionInvocation;   
  16. import com.opensymphony.xwork2.interceptor.AbstractInterceptor;   
  17.   
  18. public class LoginInterceptor extends AbstractInterceptor {   
  19.     public static final String USER_SESSION_KEY="wallet.session.user";   
  20.     public static final String COOKIE_REMEMBERME_KEY="wallet.cookie.rememberme";   
  21.     public static final String GOING_TO_URL_KEY="GOING_TO";   
  22.        
  23.     private UserDAO userDao;   
  24.   
  25.     @Override  
  26.     public String intercept(ActionInvocation invocation) throws Exception {   
  27.            
  28.         ActionContext actionContext = invocation.getInvocationContext();   
  29.         HttpServletRequest request= (HttpServletRequest) actionContext.get(StrutsStatics.HTTP_REQUEST);   
  30.            
  31.         Map session = actionContext.getSession();   
  32.         if (session != null && session.get(USER_SESSION_KEY) != null){   
  33.             return invocation.invoke();   
  34.         }   
  35.            
  36.         Cookie[] cookies = request.getCookies();   
  37.         if (cookies!=null) {   
  38.             for (Cookie cookie : cookies) {   
  39.                 if (COOKIE_REMEMBERME_KEY.equals(cookie.getName())) {   
  40.                     String value = cookie.getValue();   
  41.                     if (StringUtils.isNotBlank(value)) {   
  42.                         String[] split = value.split("==");   
  43.                         String userName = split[0];   
  44.                         String password = split[1];   
  45.                         try {   
  46.                             User user = userDao   
  47.                                     .attemptLogin(userName, password);   
  48.                             session.put(USER_SESSION_KEY, user);   
  49.                         } catch (UserNotFoundException e) {   
  50.                             setGoingToURL(session, invocation);   
  51.                             return "login";   
  52.                         }   
  53.                     } else {   
  54.                         setGoingToURL(session, invocation);   
  55.                         return "login";   
  56.                     }   
  57.                     return invocation.invoke();   
  58.                 }   
  59.             }   
  60.         }   
  61.         setGoingToURL(session, invocation);   
  62.         return "login";   
  63.     }   
  64.   
  65.     private void setGoingToURL(Map session, ActionInvocation invocation){   
  66.         String url = "";   
  67.         String namespace = invocation.getProxy().getNamespace();   
  68.         if (StringUtils.isNotBlank(namespace) && !namespace.equals("/")){   
  69.             url = url + namespace;   
  70.         }   
  71.         String actionName = invocation.getProxy().getActionName();   
  72.         if (StringUtils.isNotBlank(actionName)){   
  73.             url = url + "/" + actionName + ".action";   
  74.         }   
  75.         session.put(GOING_TO_URL_KEY, url);   
  76.     }   
  77.        
  78.     public UserDAO getUserDao() {   
  79.         return userDao;   
  80.     }   
  81.   
  82.     public void setUserDao(UserDAO userDao) {   
  83.         this.userDao = userDao;   
  84.     }   
  85.   
  86. }   
package com.javaeye.dengyin2000.wallet.interceptor;
import java.util.Map;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.lang.StringUtils;
import org.apache.struts2.StrutsStatics;
import com.javaeye.dengyin2000.wallet.dao.UserDAO;
import com.javaeye.dengyin2000.wallet.dao.UserNotFoundException;
import com.javaeye.dengyin2000.wallet.domains.User;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
public class LoginInterceptor extends AbstractInterceptor {
public static final String USER_SESSION_KEY="wallet.session.user";
public static final String COOKIE_REMEMBERME_KEY="wallet.cookie.rememberme";
public static final String GOING_TO_URL_KEY="GOING_TO";
private UserDAO userDao;
@Override
public String intercept(ActionInvocation invocation) throws Exception {
ActionContext actionContext = invocation.getInvocationContext();
HttpServletRequest request= (HttpServletRequest) actionContext.get(StrutsStatics.HTTP_REQUEST);
Map session = actionContext.getSession();
if (session != null && session.get(USER_SESSION_KEY) != null){
return invocation.invoke();
}
Cookie[] cookies = request.getCookies();
if (cookies!=null) {
for (Cookie cookie : cookies) {
if (COOKIE_REMEMBERME_KEY.equals(cookie.getName())) {
String value = cookie.getValue();
if (StringUtils.isNotBlank(value)) {
String[] split = value.split("==");
String userName = split[0];
String password = split[1];
try {
User user = userDao
.attemptLogin(userName, password);
session.put(USER_SESSION_KEY, user);
} catch (UserNotFoundException e) {
setGoingToURL(session, invocation);
return "login";
}
} else {
setGoingToURL(session, invocation);
return "login";
}
return invocation.invoke();
}
}
}
setGoingToURL(session, invocation);
return "login";
}
private void setGoingToURL(Map session, ActionInvocation invocation){
String url = "";
String namespace = invocation.getProxy().getNamespace();
if (StringUtils.isNotBlank(namespace) && !namespace.equals("/")){
url = url + namespace;
}
String actionName = invocation.getProxy().getActionName();
if (StringUtils.isNotBlank(actionName)){
url = url + "/" + actionName + ".action";
}
session.put(GOING_TO_URL_KEY, url);
}
public UserDAO getUserDao() {
return userDao;
}
public void setUserDao(UserDAO userDao) {
this.userDao = userDao;
}
}



首先判斷session中有沒有用戶信息， 如果有的話繼續， 如果沒有的話，檢查cookie中有沒有rememberme的值，如果有的話，用==分割， 取得用戶名密碼進行登入。如果沒有這個用戶的話，記錄下request的action地址然後轉到登入頁面。如果驗證有這個用戶，則繼續下面的interceptor。 如果cookie中沒有信息的話，則記錄request的action地址然後轉到登入頁面。 以上就是LoginInterceptor的全部代碼。

下面我們看看struts.xml

Java代碼
  1. <?xml version="1.0" encoding="UTF-8"?>   
  2.   
  3. <!DOCTYPE struts PUBLIC    
  4.     "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"  
  5.     "http://struts.apache.org/dtds/struts-2.0.dtd">   
  6.   
  7. <struts>   
  8.     <package name="default" extends="struts-default">   
  9.         <interceptors>   
  10.             <interceptor name="loginInterceptor" class="loginInterceptor"></interceptor>   
  11.             <interceptor-stack name="loginDefaultStack">   
  12.                 <interceptor-ref name="loginInterceptor"></interceptor-ref>   
  13.                 <interceptor-ref name="defaultStack"></interceptor-ref>   
  14.             </interceptor-stack>   
  15.         </interceptors>   
  16.         <default-interceptor-ref name="loginDefaultStack"></default-interceptor-ref>   
  17.         <global-results>   
  18.             <result name="login" type="redirect">/login.jsp</result>   
  19.         </global-results>        
  20.         <action name="index" class="indexAction">   
  21.             <result>/index.jsp</result>   
  22.         </action>   
  23.         <action name="logout" class="logoutAction"></action>   
  24.            
  25.         <action name="login" class="loginAction" method="login">   
  26.             <result type="redirect">${goingToURL}</result>   
  27.             <result name="input">/login.jsp</result>   
  28.             <interceptor-ref name="defaultStack"></interceptor-ref>   
  29.         </action>   
  30.            
  31.         <action name="register" class="registerAction">   
  32.             <result type="redirect">/login.jsp</result>   
  33.             <result name="input">/register.jsp</result>   
  34.             <interceptor-ref name="defaultStack"></interceptor-ref>   
  35.         </action>   
  36.     </package>   
  37. </struts>   
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="default" extends="struts-default">
<interceptors>
<interceptor name="loginInterceptor" class="loginInterceptor"></interceptor>
<interceptor-stack name="loginDefaultStack">
<interceptor-ref name="loginInterceptor"></interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="loginDefaultStack"></default-interceptor-ref>
<global-results>
<result name="login" type="redirect">/login.jsp</result>
</global-results>
<action name="index" class="indexAction">
<result>/index.jsp</result>
</action>
<action name="logout" class="logoutAction"></action>
<action name="login" class="loginAction" method="login">
<result type="redirect">${goingToURL}</result>
<result name="input">/login.jsp</result>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
<action name="register" class="registerAction">
<result type="redirect">/login.jsp</result>
<result name="input">/register.jsp</result>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
</package>
</struts>



我們是使用的默認的interceptor stack是loginInterceptor， 如果你需要讓不登入的用戶也能訪問的話，你需要配置你的action使用defaultStack。 我們這裏的login, register使用的就是defaultStack。 這裏要注意的是success的result是我們用LoginInterceptor設過來的值。 這樣我們就能夠轉到用戶輸入的起始頁面。 下面我們再來看看login.jsp 和 loginAction

Java代碼
  1. <%@taglib prefix="s" uri="/struts-tags" %>   
  2. <%@ page language="java" contentType="text/html; charset=UTF-8"  
  3.     pageEncoding="UTF-8"%>   
  4. <html>   
  5. <head>   
  6.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">   
  7.     <title>Wallet-Login</title>   
  8. </head>   
  9. <body>   
  10. <h2>Login</h2>    
  11. <s:actionmessage/>   
  12. <s:actionerror/>   
  13. <s:form action="login" method="post" validate="false" theme="xhtml">   
  14. <s:textfield name="loginName" label="Username"></s:textfield><br/>   
  15. <s:password name="password" label="Password"></s:password><br/>   
  16. <s:checkbox label="Remember Me" name="rememberMe"></s:checkbox>   
  17. <s:submit value="%{'Login'}"></s:submit>    
  18. </s:form>   
  19. <a href="register.jsp">Register</a>   
  20. </body>   
  21. </html>   
<%@taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Wallet-Login</title>
</head>
<body>
<h2>Login</h2>
<s:actionmessage/>
<s:actionerror/>
<s:form action="login" method="post" validate="false" theme="xhtml">
<s:textfield name="loginName" label="Username"></s:textfield><br/>
<s:password name="password" label="Password"></s:password><br/>
<s:checkbox label="Remember Me" name="rememberMe"></s:checkbox>
<s:submit value="%{'Login'}"></s:submit>
</s:form>
<a href="register.jsp">Register</a>
</body>
</html>


Java代碼
  1. package com.javaeye.dengyin2000.wallet.actions;   
  2.   
  3. import java.util.Map;   
  4.   
  5. import javax.servlet.http.Cookie;   
  6. import javax.servlet.http.HttpServletRequest;   
  7. import javax.servlet.http.HttpServletResponse;   
  8.   
  9. import org.apache.commons.lang.StringUtils;   
  10. import org.apache.struts2.interceptor.CookiesAware;   
  11. import org.apache.struts2.interceptor.ServletRequestAware;   
  12. import org.apache.struts2.interceptor.ServletResponseAware;   
  13. import org.apache.struts2.interceptor.SessionAware;   
  14.   
  15. import com.javaeye.dengyin2000.wallet.dao.UserDAO;   
  16. import com.javaeye.dengyin2000.wallet.dao.UserNotFoundException;   
  17. import com.javaeye.dengyin2000.wallet.domains.User;   
  18. import com.javaeye.dengyin2000.wallet.interceptor.LoginInterceptor;   
  19. import com.opensymphony.xwork2.ActionSupport;   
  20.   
  21. public class LoginAction extends ActionSupport implements ServletResponseAware, ServletRequestAware, SessionAware, CookiesAware{   
  22.   
  23.     private UserDAO userDao;   
  24.     private String loginName;   
  25.     private String password;   
  26.     private boolean rememberMe;   
  27.     private HttpServletResponse response;   
  28.     private HttpServletRequest request;   
  29.     private Map session;   
  30.     private Map cookies;   
  31.     private String goingToURL;   
  32.     public String getGoingToURL() {   
  33.         return goingToURL;   
  34.     }   
  35.     public void setGoingToURL(String goingToURL) {   
  36.         this.goingToURL = goingToURL;   
  37.     }   
  38.     public boolean isRememberMe() {   
  39.         return rememberMe;   
  40.     }   
  41.     public void setRememberMe(boolean rememberMe) {   
  42.         this.rememberMe = rememberMe;   
  43.     }   
  44.     public String getLoginName() {   
  45.         return loginName;   
  46.     }   
  47.     public void setLoginName(String loginName) {   
  48.         this.loginName = loginName;   
  49.     }   
  50.     public String getPassword() {   
  51.         return password;   
  52.     }   
  53.     public void setPassword(String password) {   
  54.         this.password = password;   
  55.     }   
  56.        
  57.        
  58.     public String login()throws Exception{   
  59.         try {   
  60.             User user = userDao.attemptLogin(loginName, password);   
  61.             if (rememberMe){   
  62.                 Cookie cookie = new Cookie(LoginInterceptor.COOKIE_REMEMBERME_KEY, user.getLoginName() + "==" + user.getPassword());   
  63.                 cookie.setMaxAge(60 * 60 * 24 * 14);   
  64.                 response.addCookie(cookie);   
  65.             }   
  66.             session.put(LoginInterceptor.USER_SESSION_KEY, user);   
  67.             String goingToURL = (String) session.get(LoginInterceptor.GOING_TO_URL_KEY);   
  68.             if (StringUtils.isNotBlank(goingToURL)){   
  69.                 setGoingToURL(goingToURL);   
  70.                 session.remove(LoginInterceptor.GOING_TO_URL_KEY);   
  71.             }else{   
  72.                 setGoingToURL("index.action");   
  73.             }   
  74.             return SUCCESS;   
  75.         } catch (UserNotFoundException e) {   
  76.             addActionMessage("user name or password is not corrected.");   
  77.             return INPUT;   
  78.         }   
  79.     }   
  80.     public UserDAO getUserDao() {   
  81.         return userDao;   
  82.     }   
  83.     public void setUserDao(UserDAO userDao) {   
  84.         this.userDao = userDao;   
  85.     }   
  86.     public void setServletResponse(HttpServletResponse response) {   
  87.         this.response = response;   
  88.     }   
  89.     public void setServletRequest(HttpServletRequest request) {   
  90.         this.request = request;   
  91.     }   
  92.     public void setSession(Map session) {   
  93.         this.session = session;   
  94.     }   
  95.     public void setCookiesMap(Map cookies) {   
  96.         this.cookies = cookies;   
  97.     }   
  98. }   
package com.javaeye.dengyin2000.wallet.actions;
import java.util.Map;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.apache.struts2.interceptor.CookiesAware;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.interceptor.SessionAware;
import com.javaeye.dengyin2000.wallet.dao.UserDAO;
import com.javaeye.dengyin2000.wallet.dao.UserNotFoundException;
import com.javaeye.dengyin2000.wallet.domains.User;
import com.javaeye.dengyin2000.wallet.interceptor.LoginInterceptor;
import com.opensymphony.xwork2.ActionSupport;
public class LoginAction extends ActionSupport implements ServletResponseAware, ServletRequestAware, SessionAware, CookiesAware{
private UserDAO userDao;
private String loginName;
private String password;
private boolean rememberMe;
private HttpServletResponse response;
private HttpServletRequest request;
private Map session;
private Map cookies;
private String goingToURL;
public String getGoingToURL() {
return goingToURL;
}
public void setGoingToURL(String goingToURL) {
this.goingToURL = goingToURL;
}
public boolean isRememberMe() {
return rememberMe;
}
public void setRememberMe(boolean rememberMe) {
this.rememberMe = rememberMe;
}
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;
}
public String login()throws Exception{
try {
User user = userDao.attemptLogin(loginName, password);
if (rememberMe){
Cookie cookie = new Cookie(LoginInterceptor.COOKIE_REMEMBERME_KEY, user.getLoginName() + "==" + user.getPassword());
cookie.setMaxAge(60 * 60 * 24 * 14);
response.addCookie(cookie);
}
session.put(LoginInterceptor.USER_SESSION_KEY, user);
String goingToURL = (String) session.get(LoginInterceptor.GOING_TO_URL_KEY);
if (StringUtils.isNotBlank(goingToURL)){
setGoingToURL(goingToURL);
session.remove(LoginInterceptor.GOING_TO_URL_KEY);
}else{
setGoingToURL("index.action");
}
return SUCCESS;
} catch (UserNotFoundException e) {
addActionMessage("user name or password is not corrected.");
return INPUT;
}
}
public UserDAO getUserDao() {
return userDao;
}
public void setUserDao(UserDAO userDao) {
this.userDao = userDao;
}
public void setServletResponse(HttpServletResponse response) {
this.response = response;
}
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
public void setSession(Map session) {
this.session = session;
}
public void setCookiesMap(Map cookies) {
this.cookies = cookies;
}
}



差不多就是這麼多代碼了。 最後看看logoutAction

Java代碼
  1. package com.javaeye.dengyin2000.wallet.actions;   
  2.   
  3. import javax.servlet.http.Cookie;   
  4. import javax.servlet.http.HttpServletRequest;   
  5. import javax.servlet.http.HttpServletResponse;   
  6. import javax.servlet.http.HttpSession;   
  7.   
  8. import org.apache.struts2.interceptor.ServletRequestAware;   
  9. import org.apache.struts2.interceptor.ServletResponseAware;   
  10.   
  11. import com.javaeye.dengyin2000.wallet.interceptor.LoginInterceptor;   
  12. import com.opensymphony.xwork2.ActionSupport;   
  13.   
  14. public class LogoutAction extends ActionSupport implements ServletRequestAware , ServletResponseAware{   
  15.   
  16.     private HttpServletRequest request;   
  17.     private HttpServletResponse response;   
  18.   
  19.     public String execute() throws Exception{   
  20.         HttpSession session = request.getSession(false);   
  21.         if (session!=null)   
  22.             session.removeAttribute(LoginInterceptor.USER_SESSION_KEY);   
  23.            
  24.         Cookie[] cookies = request.getCookies();   
  25.         if (cookies!=null) {   
  26.             for (Cookie cookie : cookies) {   
  27.                 if (LoginInterceptor.COOKIE_REMEMBERME_KEY.equals(cookie   
  28.                         .getName())) {   
  29.                     cookie.setValue("");   
  30.                     cookie.setMaxAge(0);   
  31.                     response.addCookie(cookie);   
  32.                     return "login";   
  33.                 }   
  34.             }   
  35.         }   
  36.         return "login";   
  37.     }   
  38.   
  39.     public void setServletRequest(HttpServletRequest request) {   
  40.         this.request = request;   
  41.     }   
  42.   
  43.     public void setServletResponse(HttpServletResponse response) {   
  44.         this.response = response;   
  45.     }   
  46.   
  47. }   
package com.javaeye.dengyin2000.wallet.actions;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import com.javaeye.dengyin2000.wallet.interceptor.LoginInterceptor;
import com.opensymphony.xwork2.ActionSupport;
public class LogoutAction extends ActionSupport implements ServletRequestAware , ServletResponseAware{
private HttpServletRequest request;
private HttpServletResponse response;
public String execute() throws Exception{
HttpSession session = request.getSession(false);
if (session!=null)
session.removeAttribute(LoginInterceptor.USER_SESSION_KEY);
Cookie[] cookies = request.getCookies();
if (cookies!=null) {
for (Cookie cookie : cookies) {
if (LoginInterceptor.COOKIE_REMEMBERME_KEY.equals(cookie
.getName())) {
cookie.setValue("");
cookie.setMaxAge(0);
response.addCookie(cookie);
return "login";
}
}
}
return "login";
}
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
public void setServletResponse(HttpServletResponse response) {
this.response = response;
}
}



這裏需要注意的是需要把cookie也清理下。

applicationContext-struts.xml

Java代碼
  1. <?xml version="1.0" encoding="UTF-8"?>   
  2. <!DOCTYPE beans PUBLIC    
  3.     "-//SPRING//DTD BEAN//EN"    
  4.     "http://www.springframework.org/dtd/spring-beans.dtd">   
  5.        
  6. <beans>   
  7.     <!-- Example of SAF2 action instantiated by Spring -->   
  8.     <!-- bean id="helloWorldAction" class="tutorial.HelloWorldAction" singleton="false" />   
  9.      -->   
  10.      <bean id="indexAction" class="com.javaeye.dengyin2000.wallet.actions.IndexAction" singleton="false"></bean>   
  11.      <bean id="loginAction" class="com.javaeye.dengyin2000.wallet.actions.LoginAction" singleton="false">   
  12.         <property name="userDao" ref="userDao" />   
  13.      </bean>   
  14.         
  15.      <bean id="logoutAction" class="com.javaeye.dengyin2000.wallet.actions.LogoutAction" singleton="false"></bean>   
  16.         
  17.      <bean id="registerAction" class="com.javaeye.dengyin2000.wallet.actions.RegisterAction" singleton="false"></bean>   
  18.         
  19.      <!-- the following is struts2 interceptors -->   
  20.      <bean id="loginInterceptor" class="com.javaeye.dengyin2000.wallet.interceptor.LoginInterceptor">   
  21.         <property name="userDao" ref="userDao" />   
  22.      </bean>   
  23.         
  24.      <bean id="userDao" class="com.javaeye.dengyin2000.wallet.dao.UserDAOImpl">   
  25.      </bean>   
  26. </beans>  

轉自：http://www.cnblogs.com/Thomson-Blog/articles/1185475.html

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