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本文介绍了一个名为TransNameFilter的Java Servlet过滤器的实现细节，该过滤器用于设置HTTP响应头并处理请求。通过继承HttpServlet并实现Filter接口，文章展示了如何在web.xml中配置此过滤器以应用于所有URL。

编写类：

package com.neusoft.web;

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.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TransNameFilter extends HttpServlet
implements Filter
{
public void init(FilterConfig arg0)
throws ServletException
{
}

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException
{
HttpServletRequest hreq = (HttpServletRequest)request;

HttpServletResponse res = (HttpServletResponse)response;

    res.setHeader("P3P", "CP=CAO PSA OUR");
    if (chain != null)
      chain.doFilter(request, response);
}

public void destroy()
{
}
}

添加监听

web.xml

<filter>
     <filter-name>transNameFilter</filter-name>
     <filter-class>com.neusoft.web.TransNameFilter</filter-class>
</filter>
<filter-mapping>
     <filter-name>transNameFilter</filter-name>
     <url-pattern>/*</url-pattern>
</filter-mapping>