Question

servlet使用filter找不到filter class

这个是我的web.xml配置文件，配置了一个filter
<filter>
<description>
</description>
<display-name>CharacterEncodingFilter</display-name>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>cn.chenghui.bbs.utils.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>ignore</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

下面是我的filter类

package cn.chenghui.bbs.utils;

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 CharacterEncodingFilter implements Filter {

protected String encoding = null;
protected FilterConfig filterConfig = null;
protected boolean ignore = true;

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
this.ignore = false;
}

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null)
request.setCharacterEncoding(encoding);
}
chain.doFilter(request, response);
}

public void destroy() {
this.encoding = null;
this.filterConfig = null;
}

protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}
用的是tomcat6.0但是启动的时候总是提示说找不到CharacterEncodingFilter

tomcat的启动错误如下：
严重: Exception starting filter CharacterEncodingFilter
java.lang.ClassNotFoundException: cn.chenghui.bbs.utils.CharacterEncodingFilter

试了好多种方法了，都不行。哪位高人告诉我是怎么搞的啊？

Answer 1

自己去classes文件下看看就有没有cn/chenghui/bbs.utils/CharacterEncodingFilter.class文件，一般是没有成功编译这个文件，导致不能正常加载。你可以把项目中的classes文件夹给删了，重新编译一下。

Answer 2

首先确定你的cn.chenghui.bbs.utils.CharacterEncodingFilter
已经编译好了。然后把你编译好的class文件 放到你项目的 \WEB-INF\classes 下。

Answer 3

路径配置！要么是*要么就是/…/…这样的配置，哪来的/*的配置？