我一般使用struts2的時(shí)候都是匹配所有類型的，這時(shí)候就會(huì)出現(xiàn)一個(gè)問(wèn)題，當(dāng)去訪問(wèn)一個(gè)servlet的時(shí)候就系統(tǒng)會(huì)把它當(dāng)作一個(gè)action來(lái)訪 問(wèn)，就會(huì)出現(xiàn)找不到action的問(wèn)題。所以這個(gè)時(shí)候就需要實(shí)現(xiàn)一個(gè)filter來(lái)過(guò)濾servlet，并且這個(gè)filter要放在struts2的 filter之前，要在把它當(dāng)作一個(gè)action之前直接把它進(jìn)行跳轉(zhuǎn)訪問(wèn)servlet

import java.io.IOException;
import java.util.ArrayList;使用云技術(shù)實(shí)現(xiàn)大規(guī)模ASP.NET應(yīng)用
import java.util.Arrays;
import java.util.List;

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 javax.servlet.http.HttpServletResponse;


public class ServletFilter implements Filter {

    private List<String> targets = new ArrayList<String>();
    
    public void destroy() {
        // TODO Auto-generated method stub

    }

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        // TODO Auto-generated method stub
        HttpServletRequest req = (HttpServletRequest)request;
        HttpServletResponse resp = (HttpServletResponse)response;
        String uri = req.getRequestURI();
        String target = uri.indexOf("?") > 0 ? uri.substring((uri.lastIndexOf("/")+1),uri.indexOf("?")) : uri.substring(uri.lastIndexOf("/")+1);
        //servlet的URL用的都是servlet/servlet的名稱
        if (uri.contains("servlet") && targets.contains(target)) {
            req.getRequestDispatcher(uri.substring(9)).forward(req, resp);
        } else {
            chain.doFilter(req, resp);
        }
    }

    public void init(FilterConfig config) throws ServletException {
        // TODO Auto-generated method stub
        String targets = config.getInitParameter("targets");//在web.xml里面聲明的filter里面的參數(shù)指定哪些servlet是需要過(guò)濾的，也可以不指定，直接過(guò)濾所有的servlet
        this.targets.addAll(Arrays.asList(targets.split(",")));
    }

}