java web基础 --- Filter

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web.xml

<?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" metadata-complete="true" version="3.0">  <description> Hello World Servlet</description>  <display-name>Hello World Servlet</display-name>  <filter>  <filter-name>Encode Filter</filter-name>  <filter-class>com.web1.util.RequestEncodeFilter</filter-class>  </filter>  <filter-mapping>  <filter-name>Encode Filter</filter-name>  <url-pattern>/*</url-pattern>  </filter-mapping>    <servlet>    <servlet-name>helloWorld</servlet-name>    <servlet-class>com.web1.hello.HelloWorldServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>helloWorld</servlet-name>    <url-pattern>/helloWorld</url-pattern>  </servlet-mapping>    <servlet>    <servlet-name>helloImage</servlet-name>    <servlet-class>com.web1.hello.ImageServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>helloImage</servlet-name>    <url-pattern>/helloImage</url-pattern>  </servlet-mapping>    </web-app>

RequestEncodeFilter.java

package com.web1.util;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;import javax.swing.text.ChangedCharSetException;/** * Servlet Filter implementation class RequestEncodeFilter */@WebFilter("/RequestEncodeFilter")public class RequestEncodeFilter implements Filter {private FilterConfig config;    /**     * Default constructor.      */    public RequestEncodeFilter() {        // TODO Auto-generated constructor stub    }/** * @see Filter#destroy() */public void destroy() {// TODO Auto-generated method stub}/** * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain) */public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {System.out.println("go encoding filter....");request.setCharacterEncoding("UTF-8");//do Filter chainchain.doFilter(request, response);}/** * @see Filter#init(FilterConfig) */public void init(FilterConfig fConfig) throws ServletException {// TODO Auto-generated method stub}}

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