小编典典

据我所知，尚无解决方案可直接在中通过查询字符串将请求匹配到过滤器web.xml。因此，您可以在web.xml使用init-

params的情况下注册过滤器，以使过滤器可配置，并void init(FilterConfig

filterConfig)在javax.servlet.Filter实现中设置模式。

package mypackage;

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.HttpServletRequest;

public class MyFilter implements Filter {

private String pattern;

@Override

public void destroy() {

// TODO Auto-generated method stub

}

@Override

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

throws IOException, ServletException {

// check whether we have a httpServletRequest and a pattern

if (this.pattern != null && request instanceof HttpServletRequest) {

// resolve the query string from the httpServletRequest

String queryString = ((HttpServletRequest) request).getQueryString();

// check whether a query string exists and matches the given pattern

if (queryString != null && queryString.matches(pattern)) {

// TODO do someting special

}

}

chain.doFilter(request, response);

}

@Override

public void init(FilterConfig filterConfig) throws ServletException {

this.pattern = filterConfig.getInitParameter("pattern");

}

}

您的web.xml中的配置如下所示：

myFilter

mypackage.MyFilter

pattern

{{PATTERN HERE}}

myFilter

/*

进一步阅读：http

//java.sun.com/javaee/5/docs/api/javax/servlet/Filter.html

2020-10-12