求一个好用的中文编码过滤器的代码

Question

3Q

Answer 1

<form name="theForm" action="" method="post" onClick="fsubmit()">
  <input type="radio" name="page">JSP页面<p>
  <input type="radio" name="page">Servlet页面<p>
  请输入测试内容:<input type="text" name="content"><p>
  <input type="submit" value="提交">
 </form>过滤器package org.sunxin.lesson.jsp.ch21;import java.io.IOException;
import javax.servlet.*; public class SetCharacterEncodingFilter implements Filter {    protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;    public void destroy() {        this.encoding = null;
        this.filterConfig = null;    }    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain chain)
 throws IOException, ServletException {        // Conditionally select and set the character encoding to be used
        if (ignore || (request.getCharacterEncoding() == null)) {
            String encoding = selectEncoding(request);
            if (encoding != null)
                request.setCharacterEncoding(encoding);
        }
        response.setCharacterEncoding("text/html;charset=+encoding");        chain.doFilter(request, response);    }
    public void init(FilterConfig filterConfig) throws ServletException {     this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
        String value = filterConfig.getInitParameter("ignore");
        if (value == null)
            this.ignore = true;
        else if (value.equalsIgnoreCase("true"))
            this.ignore = true;
        else if (value.equalsIgnoreCase("yes"))
            this.ignore = true;
        else
            this.ignore = false;    }    protected String selectEncoding(ServletRequest request) {        return (this.encoding);    }
} <?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">
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>TestServlet</servlet-name>
    <servlet-class>org.sunxin.lesson.jsp.ch21.TestServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>TestServlet</servlet-name>
    <url-pattern>/test</url-pattern>
  </servlet-mapping>
  <filter>
   <filter-name>SetCharacterEncodingFilter</filter-name>
   <filter-class>org.sunxin.lesson.jsp.ch21.SetCharacterEncodingFilter</filter-class>
   <init-param>
    <param-name>encoding</param-name>
    <param-value>GBK</param-value>
   </init-param>
   <init-param>
    <param-name>ignore</param-name>
    <param-value>true</param-value>
   </init-param>
  </filter>
  
  <filter-mapping>
   <filter-name>SetCharacterEncodingFilter</filter-name>
   <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>