monitorfilter.java

来自「JAVA Servlet2.3外文书籍源码」· Java 代码 · 共 41 行

package monitor;

import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletContext;

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

import java.io.IOException;

public class MonitorFilter implements Filter {

    private Matrix matrix;
    
    public void init(FilterConfig filterConfig) {   
        matrix = new Matrix();
        filterConfig.getServletContext().setAttribute("MATRIX", matrix);        
    }
    
    public void doFilter(ServletRequest request,ServletResponse response, FilterChain chain)
    throws IOException, ServletException {
        
        long time = System.currentTimeMillis();
        String path = ((HttpServletRequest)request).getServletPath();
        chain.doFilter(request, response);
        time = System.currentTimeMillis() - time;
        matrix.addRequest(new Request(path, time));
        
    }
    
    public void destroy() {
        matrix = null;
    }

}