pagerfilter.java

来自「这个主要是办公自动化系统的源代码」· Java 代码 · 共 55 行

package com.ygp.oa.web;

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.ygp.oa.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{
			//处理完所有事情清除掉threadlocal中的值
			SystemContext.removeOffset();
			SystemContext.removePagesize();
		}		
	}	
	
	protected int getOffset(HttpServletRequest request){
		//定义转换参数
		int offset=0;
		try {
			offset=Integer.parseInt(request.getParameter("pager.offset"));
		} catch (NumberFormatException ignore) {
		}
		return offset;
	}

	protected int getPagesize(HttpServletRequest request){
		return 10;
	}

	public void init(FilterConfig arg0) throws ServletException {
			
	}
	
		

}