servlet2.4如何实现filter?

Question

<?xml version="1.0" encoding="UTF-8"?>
<web-app 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"
version="2.4">
<filter>
<filter-name>encodeFilter</filter-name>
<filter-class>com.mci.netoa.EncodeFilter</filter-class>
<init-param>
<param-name>encode</param-name>
<param-value>gb2312</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodeFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
... ...
</web-app>EncodeFilter类如下:package net.mcicn.software;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 EncodeFilter implements Filter {
protected String encoding = null;
protected FilterConfig filterConfig = null; public void destroy() {
this.encoding = null;
this.filterConfig = null; } public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
if (request.getCharacterEncoding() == null) {
String encoding = selectEncoding(request);
if (encoding != null)
request.setCharacterEncoding(encoding);
}
chain.doFilter(request, response); } public void init(FilterConfig filterConfig) throws ServletException { this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encode");
} protected String selectEncoding(ServletRequest request) { return (this.encoding); }}错误如下：
type Status reportmessage /mcioa/description The requested resource (/mcioa/) is not available.

Answer 1

URL“/mcioa/”找不到，在web.xml中加个welcome-file看看。

Answer 2

这个都有的。如果我把web.xml中的
<filter>
<filter-name>encodeFilter</filter-name>
<filter-class>com.mci.netoa.EncodeFilter</filter-class>
<init-param>
<param-name>encode</param-name>
<param-value>gb2312</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodeFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
去掉一切都可以。但是当中文数据插入到数据库时成乱码啊

Answer 3

那你重新写一个filter，把你原来的代码拷贝进去，然后把原来的web.xml也拷贝过去！

Answer 4

aa=new String(aa.getBytes("iso-8859-1"),"gb2312");

Answer 5

老兄，EncodeFilter的package名写错了吧？