过滤器添加后，启动服务时总是报找不到过滤器类的错误，我的过滤器配置是自动生成的路径不会错啊。。。

Question

以下是错误信息
严重: Exception starting filter CharSetEncoding
java.lang.ClassNotFoundException: cn.huitian.website.filter.CharSetEncoding
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1360)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:249)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3709)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4356)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
2009-12-31 15:14:03 org.apache.catalina.core.StandardContext start
严重: Error filterStart

Answer 1

java.lang.ClassNotFoundException: cn.huitian.website.filter.CharSetEncoding 配置文件没配或配错了导致类找不到

Answer 2

 <filter>
    <filter-name>Set Character Encoding</filter-name>
    <filter-class>commo.SetCharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>GBK</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>Set Character Encoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>//丢进web.xml
再给你个类哈！
package commo;
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.UnavailableException;public class SetCharacterEncodingFilter implements Filter {
    // ----------------------------------------------------- Instance Variables
    /**
     * The default character encoding to set for requests that pass through
     * this filter.
     */
    protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;
    // --------------------------------------------------------- Public Methods
    /**
     * Take this filter out of service.
     */
    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);
        } // Pass control on to the next filter
        chain.doFilter(request, response);    }
    /**
     * Place this filter into service.
     *
     * @param filterConfig The filter configuration object
     */
    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 Methods    protected String selectEncoding(ServletRequest request) {        return (this.encoding);    }
}
//新建个类就行了

Answer 3

// ------------------------------------------------------ Protected Methods    protected String selectEncoding(ServletRequest request) {        return (this.encoding);    } 
这个方法是什么意思，麻烦给我讲一下，今天第二次看到，小弟很是不懂