requestoverridefilter.java

来自「一个很好的开源项目管理系统源代码」· Java 代码 · 共 56 行

package net.java.workeffort.webapp.support;

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;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Looks like in some containers (ex Resin, WebSphere), request.getRequestURL()
 * behaves differently than in other containers. Some containers return the URL
 * of the initial request, while some other containers return the URL of a
 * forward if any (Ex: url to the tiles page) . This creates problems in the
 * datagrid library which is used by the application for pagination and needs
 * the initial URL. This filter should take care of the problem. See
 * <code>web.xml</code> for configuration information.
 * @see RequestWrapper
 * @author Antony Joseph
 */
public class RequestOverrideFilter implements Filter {
    private static final Log log = LogFactory
            .getLog(RequestOverrideFilter.class);

    /**
     * {@inheritDoc}
     */
    public void init(FilterConfig filterConfig) {
        if (log.isInfoEnabled())
            log.info("RequestOverrideFilter enabled");
    }

    /**
     * {@inheritDoc}
     */
    public void doFilter(ServletRequest servletRequest,
            ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {
        RequestWrapper wrapper = new RequestWrapper(
                (HttpServletRequest) servletRequest);
        filterChain.doFilter(wrapper, servletResponse);
    }

    /**
     * {@inheritDoc}
     */
    public void destroy() {
        // nothing to destroy
    }
}