Struts2自定义拦截器

最新推荐文章于 2020-06-03 15:39:49 发布

joker柒月

最新推荐文章于 2020-06-03 15:39:49 发布

阅读量189

点赞数

CC 4.0 BY-SA版权

分类专栏： SSH

本文链接：https://blog.youkuaiyun.com/qwl755/article/details/84842795

SSH 专栏收录该内容

18 篇文章

订阅专栏

本文介绍了Struts2中拦截器的结构，包括如何定义一个类继承AbstractInterceptor并实现Interceptor接口，以及接口内init、destroy和interceptor方法的作用。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

拦截器的结构

一、在struts2中拦截器的结构：

（一）定义了一个类继承AbstractInterceptor类。

（二）AbstractInterceptor类实现Interceptor接口。

（三）接口里面有三个方法：init（初始化操作）、destroy（销毁操作）、interceptor（拦截器逻辑操作）。

package qwl.com.domain;

public class User {
	private String username;
	private String password;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}

}

package qwl.com.domain;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ModelDriven;

public class LoginAction extends ActionSupport implements ModelDriven<User>{
	private static final long serialVersionUID = 1L;
    private User user = new User();
	public User getModel() {
		return user;
	}
	@Override
	public String execute() throws Exception {
		ActionContext actionContext = ActionContext.getContext();
		if("tom".equals(user.getUsername())&&"123".equals(user.getPassword())){
			actionContext.getSession().put("user", user);
			return SUCCESS;
		}else{
			actionContext.put("msg", "用户名或密码不正确");
			return INPUT;
		}
	}

}

package qwl.com.domain;
import com.opensymphony.xwork2.ActionSupport;

public class BookAction extends ActionSupport{
	private static final long serialVersionUID = 1L;
	public String add(){
		System.out.println("book add");
		return SUCCESS;
	}
	public String delete(){
		System.out.println("book delete");
		return SUCCESS;
	}
	public String update(){
		System.out.println("book update");
		return SUCCESS;
	}
	public String find(){
		System.out.println("book find");
		return SUCCESS;
	}
}

package qwl.com.interceptor;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;


public class PrivilegeInterceptor extends AbstractInterceptor{
	private static final long serialVersionUID = 1L;
	@Override
	public String intercept(ActionInvocation invocation) throws Exception {
		//得到actionContext
		ActionContext actionContext = invocation.getInvocationContext();
		Object user = actionContext.getSession().get("user");
		if(user != null){
			return invocation.invoke(); //继续向下执行
		}else{
			actionContext.put("msg", "您还未登录，请先登录");
			return Action.LOGIN;//如果不存在，返回login值
		}
	}

}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC  
            "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"  
    "http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
	<package name = "struts2" namespace = "/" extends = "struts-default">
         <interceptors>
            <interceptor name = "privilege" class = "qwl.com.interceptor.PrivilegeInterceptor"/>
            <interceptor-stack name = "myStack">
               <interceptor-ref name = "defaultStack" />
               <interceptor-ref name = "privilege" />
            </interceptor-stack>
         </interceptors>
         <action name = "login" class = "qwl.com.domain.LoginAction">
            <result>main.jsp</result>
            <result name = "input">/login.jsp</result>
         </action>
         <action name = "book_*" class = "qwl.com.domain.BookAction" method = "{1}">
            <result>/success.jsp</result>
            <result name = "login">/login.jsp</result>
            <interceptor-ref name = "myStack" />
            <allowed-methods>update,delete,add,find</allowed-methods>
         </action>
     </package>         
</struts>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!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>login</title>
</head>
<body>
<center>
  ${requestScope.msg}<br>
    <form action = "login.action" method = "post">
      <table>
         <tr>
            <td><label style = "text-align:right;">用户名：</label></td>
            <td><input type = "text" name = "username"></td>
         </tr>
         <tr>
            <td><label style = "text-align:right;">密码：</label></td>
            <td><input type = "password" name = "password"></td>
         </tr>
         <tr>
            <td align = "right" colspan = "2">
                <input type = "submit" value = "登录"/>
            </td>
         </tr>
       </table>
    </form>
   </center>
</body>
</html>

<%@ 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>main.jsp</title>
</head>
<body>
	<a href = "book_add">book add</a><br>
     <a href = "book_delete">book delete</a><br>
      <a href = "book_update">book update</a><br>
       <a href = "book_find">book find</a><br>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!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>成功页面</title>
</head>
<body>
	用户${user.username}操作成功 <br>
</body>
</html>