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Struts2中攔截器與過濾器的執行順序 收藏
Struts2中攔截器與過濾器的執行順序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>
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("請求過濾");
- chain.doFilter(request, response);
- System.out.println("返回過濾");
- }
- public void init(FilterConfig arg0) throws ServletException {
- }
- }
interceptor.LoginIntercepto
- 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("請求攔截");
- if(!"YOYO".equals(ServletActionContext.getRequest().getParameter("username"))){
- return "login";
- }
- String result = ai.invoke();
- System.out.println("返回攔截");
- return result;
- }
- }
action.LoginAction
- package action;
- public class LoginAction {
- public String execute(){
- System.out.println("登陸ACTION");
- return "success";
- }
- }
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>
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>
部署好後打開login.jsp，輸入任意非"YOYO"字符，控制檯打印出
請求過濾
請求攔截
返回過濾
說明攔截之後還會按照原路返回；
如果輸入"YOYO"，則打印出
請求過濾
請求攔截
登陸ACTION
返回攔截
返回過濾
由此可以驗證它的執行順序 = =。