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Struts2中拦截器与过滤器的执行顺序

来源：互联网发布：淘宝店铺找人装修编辑：程序博客网时间：2024/05/14 11:38

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>MyFilter</filter-name>
<filter-class>filter.MyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>MyFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

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filter.MyFilter

package filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class MyFilter implements Filter {
public void destroy() {
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
System.out.println("请求过滤");
chain.doFilter(request, response);
System.out.println("返回过滤");
}
public void init(FilterConfig arg0) throws ServletException {
}
}

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interceptor.LoginInterceptor

package interceptor;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
public class LoginInterceptor extends AbstractInterceptor {
private static final long serialVersionUID = -2796326480994355318L;
@Override
public String intercept(ActionInvocation ai) throws Exception {
System.out.println("请求拦截");
if(!"YOYO".equals(ServletActionContext.getRequest().getParameter("username"))){
return "login";
}
String result = ai.invoke();
System.out.println("返回拦截");
return result;
}
}

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action.LoginAction

package action;
public class LoginAction {
public String execute(){
System.out.println("登陆ACTION");
return "success";
}
}

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index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<h3>Login Success!</h3>
</body>
</html>

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login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<h3>Login</h3>
<hr>
<form action="Login.action" method="OST">
Name: <input type="text" name="username" />
<input type="submit" value="submit" />
</form>
</body>
</html>

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部署好后打开login.jsp，输入任意非"YOYO"字符，控制台打印出

请求过滤

请求拦截

返回过滤

说明拦截之后还会按照原路返回；

如果输入"YOYO"，则打印出

请求过滤

请求拦截

登陆ACTION

返回拦截

返回过滤

由此可以验证它的执行顺序 = =。

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淘宝店铺找人装修

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