struts2自定义拦截器（登陆校验拦截器）

迈不过友情╰ 2022-04-23 04:38 303阅读 0赞

### 需求：有些页面需要先登录才可以访问，如果没有登陆就跳转到login.jsp去登陆 ###

此案例为访问login方法的时候不拦截，只有把user放到session中才可以访问别的方法

### web.xml 配置拦截器 ###

<filter>
      	<filter-name>struts2</filter-name>
      	<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
      </filter>
      <filter-mapping>
      	<filter-name>struts2</filter-name>
      	<url-pattern>/*</url-pattern>
      </filter-mapping>

### LoginInterceptor 自定义登陆拦截器 ###

public class LoginInterceptor extends MethodFilterInterceptor{
    
    	@Override
    	protected String doIntercept(ActionInvocation invocation) throws Exception {
    		//获取session
    		Map<String, Object> session = ActionContext.getContext().getSession();
    		//session中获取user
    		Object object = session.get("user");
    		//没登陆
    		if(object==null) {
    			return "toLogin";
    		}else {
    			//已经登陆  ，放行
    			return invocation.invoke();
    		}
    		
    	}
    
    }

### LoginAction 登陆Action ###

public class LoginAction extends ActionSupport{
    
    	
    	public String login() throws Exception {
    		User user = new User();
    		user.setName("jack");
    		user.setPassword("123");
    		Map<String, Object> session = ActionContext.getContext().getSession();
    		session.put("user", user);
    		return "toIndex";
    	}
    	
    	public String list() throws Exception {
    		List<String> arrayList = new ArrayList<>();
    		arrayList.add("user1");
    		arrayList.add("user2");
    		ActionContext.getContext().put("list", arrayList);
    		return "toSuccess";
    	}
    	
    }

### struts.xml 指定login方法不拦截 ###

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE struts PUBLIC
    	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    	"http://struts.apache.org/dtds/struts-2.3.dtd">
    <struts>
    	<constant name="struts.devMode" value="true"></constant>
    	<package name="result" namespace="/" extends="struts-default">
    		<interceptors>
    		
    			<interceptor name="myInterceptor" class="com.it.action.LoginInterceptor"></interceptor>
    		
    			<interceptor-stack name="myStack">
    				
    				<interceptor-ref name="myInterceptor">
    					
    				 	<param name="excludeMethods">login</param> 
    				 	
    					
    					
    				</interceptor-ref>
    				
    				<interceptor-ref name="defaultStack"></interceptor-ref>
    			</interceptor-stack>
    		</interceptors>
    		
    		<default-interceptor-ref name="myStack"></default-interceptor-ref>
    		
    		<global-results>
    			<result name="toLogin" type="redirect">/login.jsp</result>
    		</global-results>
    		
    		<action name="DemoAction1_*" class="com.it.action.LoginAction" method="{1}">
    			<result name="toIndex" type="dispatcher">/hello.jsp</result>
    			<result name="toSuccess" type="dispatcher">/success.jsp</result>
    		</action>
    	</package>
    	
    	
    </struts>