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Servlet 过滤器(FilterDispatcher)

article 2025/8/25 23:32:59

 Servlet 过滤器(FilterDispatcher)
NewFilterDispatcher.java:
package com.filter;
import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.apache.struts2.dispatcher.FilterDispatcher;
public class NewFilterDispatcher extends FilterDispatcher {
     private static String encoding = "GB2312";
        public void init(FilterConfig filterConfig) throws ServletException {
            super.init(filterConfig);
            String encodingParam = filterConfig.getInitParameter("encoding");
            if (encodingParam != null && encodingParam.trim().length() != 0) {
                encoding = encodingParam;
            }
        }
        public void doFilter(ServletRequest request, ServletResponse response,
                FilterChain chain) throws IOException, ServletException {
            request.setCharacterEncoding(encoding);
            super.doFilter(request, response, chain);
        }
    
}
Web.xml:
    <filter>
        <filter-name>struts</filter-name>
        <filter-class>com.filter.NewFilterDispatcher</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>GB2312</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>struts</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
 