Struts2学习笔记（四）之——struts.xml配置文拦截器

青旅半醒 2022-05-15 04:23 230阅读 0赞

struts.xml

<?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="manage" namespace="/" extends="struts-default">
    		
    		
    		<interceptors>
    			<interceptor name="myInteceptor" class="com.java1234.inteceptor.MyInteceptor"></interceptor>
    			<interceptor name="loginInteceptor" class="com.java1234.inteceptor.LoginInteceptor"></interceptor>
    			
    			<interceptor-stack name="myStack">
    				<interceptor-ref name="loginInteceptor"></interceptor-ref>
    				<interceptor-ref name="defaultStack"></interceptor-ref>
    			</interceptor-stack>
    		</interceptors>
    		
    		<default-interceptor-ref name="myStack"></default-interceptor-ref>
    		
    		<global-results>
    			<result name="error">error.jsp</result>
    		</global-results>
    		
    		
    		<action name="hello" class="com.java1234.action.HelloWorldAction">
    			<result name="success" >success.jsp</result>
    			<interceptor-ref name="myInteceptor"></interceptor-ref>
    			<interceptor-ref name="defaultStack"></interceptor-ref>
    		</action>
    		<action name="user" class="com.java1234.action.UserAction">
    			<result name="success" >success.jsp</result>
    			
    			<interceptor-ref name="defaultStack"></interceptor-ref>
    		</action>
    		<action name="girl" class="com.java1234.action.GirlAction">
    			<result name="success" >success.jsp</result>
    			
    		</action>
    	</package>
    </struts>

拦截器类LoginInteceptor

package com.java1234.inteceptor;
    
    import java.util.Map;
    
    import javax.servlet.http.HttpServletRequest;
    
    import org.apache.struts2.ServletActionContext;
    
    import com.opensymphony.xwork2.ActionContext;
    import com.opensymphony.xwork2.ActionInvocation;
    import com.opensymphony.xwork2.interceptor.Interceptor;
    
    public class LoginInteceptor implements Interceptor{
    
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    	@Override
    	public void destroy() {
    		
    		System.out.println("MyInteceptor销毁");
    	}
    	@Override
    	public void init() {
    		
    		System.out.println("Inteceptor初始化");
    	}
    	@Override
    	public String intercept(ActionInvocation invocation) throws Exception {
    		System.out.println("在Action执行之前");
    		
    		ActionContext actionContext = invocation.getInvocationContext();
    		Map<String, Object> session = actionContext.getSession();
    		Object currentUser = session.get("currentUser");
    		String result = null;
    		if(currentUser!=null) {
    			result = invocation.invoke();
    		} else {
    			HttpServletRequest request = (HttpServletRequest)invocation.getInvocationContext().get(ServletActionContext.HTTP_REQUEST);
    			request.setAttribute("error", "请先登录");
    			result = "error";
    			
    		}
    		System.out.println("result:"+result);
    		System.out.println("在Action执行之后");
    		return result;
    	}
    
    }

GirlAction

package com.java1234.action;
    
    import com.opensymphony.xwork2.ActionSupport;
    
    public class GirlAction extends ActionSupport{
    
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    
    	@Override
    	public String execute() throws Exception {
    		System.out.println("看美女");
    		return SUCCESS;
    	}
    }

UserAction

package com.java1234.action;
    
    import java.util.Map;
    
    import com.java1234.model.User;
    import com.java1234.service.UserService;
    import com.opensymphony.xwork2.ActionContext;
    import com.opensymphony.xwork2.ActionSupport;
    
    public class UserAction extends ActionSupport{
    
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 2L;
    
    	private UserService userService = new UserService();
    	private User user;
    	private String error;
    	
    	public String getError() {
    		return error;
    	}
    	public void setError(String error) {
    		this.error = error;
    	}
    	public User getUser() {
    		return user;
    	}
    	public void setUser(User user) {
    		this.user = user;
    	}
    	@Override
    	public String execute() throws Exception {
    		boolean login2 = userService.login(user);
    		if(login2) {
    			ActionContext actionContext = ActionContext.getContext();
    			Map<String, Object> session = actionContext.getSession();
    			session.put("currentUser", user);
    			return SUCCESS;
    		}else {
    			this.error = "用户名或密码错误";
    			return ERROR;
    		}
    	}
    }

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    <form action="user" method="post">
    	用户名：<input type="text" name="user.userName" />
    	密码：<input type="text" name="user.password" />
    	<input type="submit" value="登录">
    </form>
    </body>
    </html>