Servlet3.0新特性WebFilter（Annotation Filter）详解
生活随笔
收集整理的這篇文章主要介紹了
Servlet3.0新特性WebFilter（Annotation Filter）详解
小編覺得挺不錯的,現在分享給大家,幫大家做個參考.
摘要：
Servlet3.0作為J2EE 6規范一部分，并隨J2EE6一起發布，WeFilter是過濾器注解，是Servlet3.0的新特性，不需要在web.xml進行配置，簡化了配置。
| Name | Type | Required | Description |
| filterName | String | Optional | Name of the filter. |
| value or urlPatterns | String[] | Required | Specify one or more URL patterns to which the filter applies. Either of attribute can be used, but not both. |
| dispatcherTypes | DispatcherType[] | Optional | Specify types of dispatcher to which the filter applies. Default isjavax.servlet.DispatcherType.REQUEST |
| servletNames | String[] | Optional | Specify names of servlets to which the filter applies. |
| displayName | String | Optional | Display name of the filter. |
| description | String | Optional | Description of the filter. |
| asyncSupported | boolean | Optional | Specify whether the filter supports asynchronous operation mode. Default is false. |
| initParams | WebInitParam[] | Optional | Specify one or more initialization parameters of the filter. Each parameter is specified by@WebInitParamannotation type. |
| smallIcon | String | Optional | Specify name of the small icon of the filter. |
| largeIcon | String | Optional | Specify name of the large icon of the filter. |
OneFilter：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | package com.what21.servlet.webfilter; 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; import javax.servlet.annotation.WebFilter; @WebFilter("/*") public class OneFilter implements Filter { ????@Override ????public void init(FilterConfig config) throws ServletException { ????} ????@Override ????public void doFilter(ServletRequest request, ServletResponse response, ????????????FilterChain chain) throws IOException, ServletException { ????????System.out.println("OneFilter doFilter()"); ????????chain.doFilter(request, response); ????} ????@Override ????public void destroy() { ????} } |
TwoFilter：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | package com.what21.servlet.webfilter; 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; import javax.servlet.annotation.WebFilter; @WebFilter(servletNames = "MyFourServlet") public class TwoFilter implements Filter { ????@Override ????public void init(FilterConfig config) throws ServletException { ????} ????@Override ????public void doFilter(ServletRequest request, ServletResponse response, ????????????FilterChain chain) throws IOException, ServletException { ????????System.out.println("TwoFilter doFilter()"); ????????chain.doFilter(request, response); ????} ????@Override ????public void destroy() { ????} } |
ThreeFilter：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | package com.what21.servlet.webfilter; 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; import javax.servlet.annotation.WebFilter; @WebFilter(servletNames = {"MyFourServlet", "MyFiveServlet"}) public class ThreeFilter implements Filter { ????@Override ????public void init(FilterConfig config) throws ServletException { ????} ????@Override ????public void doFilter(ServletRequest request, ServletResponse response, ????????????FilterChain chain) throws IOException, ServletException { ????????System.out.println("ThreeFilter doFilter()"); ????????chain.doFilter(request, response); ????} ????@Override ????public void destroy() { ????} } |
FourFilter：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | package com.what21.servlet.webfilter; 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; import javax.servlet.annotation.WebFilter; @WebFilter({"/one","/two"}) public class FourFilter implements Filter { ????@Override ????public void init(FilterConfig config) throws ServletException { ????} ????@Override ????public void doFilter(ServletRequest request, ServletResponse response, ????????????FilterChain chain) throws IOException, ServletException { ????????System.out.println("FourFilter doFilter()"); ????????chain.doFilter(request, response); ????} ????@Override ????public void destroy() { ????} } |
FiveFilter：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | package com.what21.servlet.webfilter; import java.io.IOException; import javax.servlet.DispatcherType; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.annotation.WebFilter; import javax.servlet.annotation.WebInitParam; @WebFilter( ????urlPatterns = "/five", ????filterName = "FiveFilter", ????initParams = { ????????@WebInitParam(name = "name", value = "username"), ????????@WebInitParam(name = "value", value = "password") ????}, ????description = "MyFiveFilter", ????dispatcherTypes = {DispatcherType.REQUEST, DispatcherType.FORWARD} ) public class FiveFilter implements Filter { ????@Override ????public void init(FilterConfig config) throws ServletException { ????????String name = config.getInitParameter("name"); ????????String value = config.getInitParameter("value"); ????????System.out.println("name = " + name); ????????System.out.println("value = " + value); ????????System.out.println("init()....."); ????} ????@Override ????public void doFilter(ServletRequest request, ServletResponse response, ????????????FilterChain chain) throws IOException, ServletException { ????????System.out.println("FiveFilter doFilter()"); ????} ????@Override ????public void destroy() { ????} } |
??
轉載于:https://www.cnblogs.com/xingzc/p/7519507.html
與50位技術專家面對面20年技術見證，附贈技術全景圖總結
以上是生活随笔為你收集整理的Servlet3.0新特性WebFilter（Annotation Filter）详解的全部內容，希望文章能夠幫你解決所遇到的問題。
- 上一篇： niceScroll在ie11和edge
- 下一篇： 20170914-构建之法：现代软件工程