struts的拦截器
Struts2 拦截器是在访问某个 Action 或 Action 的某个方法,字段之前或之后实施拦截,并且 Struts2 拦截器是可 插拔的,拦截器是AOP的一种实现. 优点:通用功能的封装,提供了可重用性
1.复制项目HeadFirstStruts2chapter02_07,并改名:HeadFirstStruts2chapter03,同时修改web project settings
2新建包com.cruise.interceptor 包, 和类Myinterceptor,实现interceptor接口,删除多余的Action,保留并修改HelloAction,
MyInterceptor如下,调String result = invocation.invoke();这个方法的时候,就是调用Action里面的方法。
package com.cruise.interceptor;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class MyInterceptor implements Interceptor{
@Override
public void destroy() {
System.out.println("Myinterceptor销毁");
}
@Override
public void init() {
System.out.println("Myinterceptor初始化");
}
@Override
public String intercept(ActionInvocation invocation) throws Exception {
System.out.println("在Action执行之前。。。");
String result = invocation.invoke();
System.out.println("在Action执行之后。。。");
System.out.println(result);
return result;
}
}
HelloAction如下:
package com.cruise.action;
import com.opensymphony.xwork2.ActionSupport;
public class HelloAction extends ActionSupport{
private String name ;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String execute() throws Exception {
System.out.println("HelloAction方法执行了");
return "success";
}
}
3struts.xml文件,定义拦截器,并在标签中引用拦截器,一个是自定义的,一个是默认的拦截器,先执行自定义的拦截器,再执行默认的拦截器。这样其他的拦截器栈才可以引用
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="myInterceptor" class="com.cruise.interceptor.MyInterceptor">interceptor>
interceptors>
<action name="hello" class="com.cruise.action.HelloAction" >
<result name="success" >success.jspresult>
<interceptor-ref name="myInterceptor">interceptor-ref>
<interceptor-ref name="defaultStack">interceptor-ref>
action>
package>
struts>
3修改success.jsp删除其他的jsp文件,
<%@ 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 heretitle>
head>
<body>
name:${name}
body>
html>
4测试:
http://localhost:8080/HeadFirstStruts2chapter03/hello?name=你好
第 18 讲 struts2的拦截器
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转载自blog.csdn.net/u010393325/article/details/83928680
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