struts2拦截器简单例子

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自定义拦截器实现步骤:

1、实现Interceptor接口

在需要配置拦截器参数的情况下使用处理拦截的方法：
public String intercept(ActionInvocation invocation) throws Exception {
}

invocation.invoke():
1-1、只要能获取这些代码，则说明拦截器验证通过，接着访问action类中对应的方法执行后续操作

1-2、没有执行这行代码：不会去调action中的方法，而是转向struts.xml文件去搜索拦截器中返回的字符标志

2、在struts.xml文件中对自定义拦截器进行配置
2-1、使用<interceptors> <interceptor name="自定义拦截器的名称"></interceptor> ... </interceptors>来加载自定义的拦截器

2-2、引用配置好的拦截到对应的action中 <interceptor-ref name="自定义拦截器的名称"/>

例子：

修改web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>struts11</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>

<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>
</web-app>

struts.xml文件的配置

<?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" namespace="/" extends="struts-default">

<interceptors>
<interceptor name="myIntercepter" class="com.caokaiyuan.intercepter.MyIntercepter"></interceptor>
</interceptors>

<action name="loginAction" class="com.caokaiyuan.action.UserAction" method="login">
<result name="login">success.jsp</result>
</action>


<action name="userAction" class="com.caokaiyuan.action.UserAction" method="user">

<interceptor-ref name="myIntercepter"></interceptor-ref>
<result name="login">login.jsp</result>
<result name="user">user.jsp</result>
</action>


<action name="clientAction" class="com.caokaiyuan.action.UserAction" method="client">

<interceptor-ref name="myIntercepter"></interceptor-ref>

<result name="login">login.jsp</result>
<result name="client">client.jsp</result>
</action>
</package>
</struts>

创建UserVO类

package com.caokaiyuan.vo;

import java.io.Serializable;

public class UserVO implements Serializable
{
private static final long serialVersionUID = 1L;

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;
}

}

创建action类UserAction

package com.caokaiyuan.action;

import org.apache.struts2.ServletActionContext;

import com.caokaiyuan.vo.UserVO;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class UserAction extends ActionSupport implements ModelDriven<UserVO>
{
private static final long serialVersionUID = 1L;

private UserVO user = new UserVO();

//登录
public String login() throws Exception
{
System.out.println(user);
ServletActionContext.getRequest().getSession().setAttribute("user", user);
return "login";
}

//客户管理
public String client() throws Exception
{
return "client";
}

//用户管理
public String user() throws Exception
{
return "user";
}

public UserVO getUser()
{
return user;
}

public void setUser(UserVO user)
{
this.user = user;
}

@Override
public UserVO getModel()
{
return user;
}

}

创建拦截器类MyIntercepter

package com.caokaiyuan.intercepter;

import com.caokaiyuan.vo.UserVO;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class MyIntercepter implements Interceptor
{
private static final long serialVersionUID = 1L;

@Override
public void destroy()
{

}

@Override
public void init()
{
System.out.println("==========MyIntercepter==========");
}

@Override
public String intercept(ActionInvocation invocation) throws Exception
{
UserVO user = (UserVO)invocation.getInvocationContext().getSession().get("user");

if (user != null)
{
System.out.println("拦截器放行！！");
return invocation.invoke();
}
else
{
System.out.println("拦截器不放行！！");
return Action.LOGIN;
}
}

}

创建index.jsp页面

<%@ 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>
<p><a href="login.jsp">用户登录</a></p>
<p><a href="userAction">用户管理</a></p>
<p><a href="clientAction">客户管理</a></p>
</body>
</html>

创建login.jsp页面

<%@ 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="loginAction" method="post">
<input type="text" name="usrename"/><br/>
<input type="password" name="password"/><br/>
<input type="submit" value="登录">
</form>
</body>
</html>

创建client.jsp页面

创建user.jsp页面

创建success.jsp页面

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