src/com/oa/utils/PagerFilter.java

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package com.oa.utils;

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 com.oa.web.SystemContext;





public class PagerFilter implements Filter {
	
	public void destroy() {
     
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		
		HttpServletRequest httpRequest = (HttpServletRequest)request;
		SystemContext.setOffset(getOffset(httpRequest));
		SystemContext.setPagesize(getPagesize(httpRequest));
		try{
			chain.doFilter(request, response);
		}finally{
			SystemContext.removeOffset();
			SystemContext.removePagesize();
		}
	}
	
	private int getOffset(HttpServletRequest request){
		int offset = 0;
		try {
			offset = Integer.parseInt(request.getParameter("pager.offset"));
		} catch (Exception ignore) {
		}
		return offset;
	}
	
	private int getPagesize(HttpServletRequest httpRequest){
        	return 10;
	}

	public void init(FilterConfig arg0) throws ServletException {

	}

}