我一般使用struts2的时候都是匹配所有类型的,这时候就会出现一个问题,当去访问一个servlet的时候就系统会把它当作一个action来访 问,就会出现找不到action的问题。所以这个时候就需要实现一个filter来过滤servlet,并且这个filter要放在struts2的 filter之前,要在把它当作一个action之前直接把它进行跳转访问servlet
import java.io.IOException;
import java.util.ArrayList;
使用云技术实现大规模ASP.NET应用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的名称
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里面声明的filter里面的参数指定哪些servlet是需要过滤的,也可以不指定,直接过滤所有的servlet
this.targets.addAll(Arrays.asList(targets.split(",")));
}
}
posted on 2011-06-27 10:04
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