编写一个简单的Struts2 拦截器

来源：互联网发布：淘宝星期四数码编辑：程序博客网时间：2024/05/23 11:54

实现一个拦截器需要implements Interceptor，或者去继承Interceptor的子类（例如抽象类AbstractInterceptor），首先，写一个Interceptor类，实现Interceptor接口。

package com.zhaozy.interceptors;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.Interceptor;

/**

*@authorCapricorn

publicclass MyInterceptor implements Interceptor {

publicvoid destroy() {

System.out.println("This is MyInterceptor.destroy()..");

}

publicvoid init() {

System.out.println("This is MyInterceptor.init()..");

}

public String intercept(ActionInvocation invocation) throws Exception {

System.out.println("This is MyIntercepor.intercept()..");

String result = invocation.invoke();

return result;

}

写一个Action类，实现登陆功能。

package com.zhaozy.actions;

import com.opensymphony.xwork2.ActionSupport;

/**

*@authorCapricorn

publicclass LoginAction extends ActionSupport {

private String username;

private String password;

public String getUsername() {

returnusername;

}

publicvoid setUsername(String username) {

this.username = username;

}

public String getPassword() {

returnpassword;

}

publicvoid setPassword(String password) {

this.password = password;

}

@Override

public String execute() throws Exception {

if ("hello".equals(this.getUsername().trim())

&& "world".equals(this.getPassword().trim())) {

returnSUCCESS;

}

this.addFieldError("username", "username or password is error!");

return"failer";

}

编写一个登陆界面：

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@ taglib uri="/struts-tags" prefix="s" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

</head>

<body>

<table>

<tr>

<s:fielderror></s:fielderror>

</td>

</tr>

</table>

<s:form action="login" method="post" theme="simple">

username:<s:textfield name="username" label="username"></s:textfield><br>

password:<s:password name="password" label="password"></s:password><br>

<s:submit label="登陆" value="登陆"></s:submit>

</s:form>

</body>

</html>

这是登陆成功后的显示页面：

<%@ 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>

</head>

<body>

</body>

</html>

然后配置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">

</interceptors>

<result name="success">/result.jsp</result>

<result name="input">/login.jsp</result>

<result name="failer">/login.jsp</result>

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

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

</action>

</package>

</struts>

这样，一个简单的拦截器就写完了，它在登陆界面提交的时候触发