gdparsexmlfilter.java

j2ee程序。 spring、xml、 实现增加内容选项。

package com.gd.web.filter;

import java.io.File;
import java.io.IOException;

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

import com.gd.mvc.util.GdDate;
import com.gd.mvc.util.GdParseXml;
import com.gd.mvc.util.GdWebPath;

public class GdParseXmlFilter implements Filter {
	protected FilterConfig config;
	//设定上下文路径
	private ServletContext context;
	private String filterName;
	/**
	 * 初始化Filter，取得上下文路径
	 */
	public void init(FilterConfig config) throws ServletException {
		this.config = config;
		context = config.getServletContext();
		filterName = config.getFilterName();
	}
	/**
	 * 进行过滤
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
		try {
			long startTime = System.currentTimeMillis();
			if (request instanceof HttpServletRequest) {
				HttpServletRequest req = (HttpServletRequest)request;
				String action = (String) req.getParameter("action");
		    	//获取系统或项目名称，既http://localhost:8080/myApp/gd/login.do?action=insert时，获取systemName=gd
			    String systemName = "";
			    String path = "";
				String ss = req.getServletPath();
				systemName = ss.split("/")[1];
				//获取访问路径，既login.do
				path = ss.split("/")[2].substring(0, ss.split("/")[2].indexOf(".do"));
				//String pathtemp = req.getRealPath(req.getContextPath());
				//获取对应的配置文件的路径
				String xmlPath = this.getXmlPath(systemName);
				
				//开始对配置文件进行解析
				GdParseXml parseXml = new GdParseXml();
				//读取配置文件
				parseXml.read(xmlPath);
				//设定从页面传来的action
				parseXml.setAction(action);
				//设定从页面传来的path
				parseXml.setPath(path);
				//对配置文件进行解析
				parseXml.parseXml();
				request.setAttribute("parseXml", parseXml);
				request.setAttribute("action", action);
				request.setAttribute("systemName", systemName);
				request.setAttribute("path", path);
				request.setAttribute("xmlPath", xmlPath);
				context.log("systemName为：" + systemName + " ,action为：" + action + " ,path为：" + path + " ,解析配置文件： " + xmlPath + " 共使用的时间：" + (System.currentTimeMillis() - startTime) + "ms" +
						"(该日志由 " + filterName + " 报出)");
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			chain.doFilter(request,response);
		}
	}
	
	private String getXmlPath(String systemName) throws IOException {
		// 获取Web环境的物理路径D:/eclipse/workspace/myApp
		GdWebPath webPath = new GdWebPath();
		webPath.getPath();
		//Xml文件所在的路径为工程项目文件夹下的conf文件夹下，名称为系统名.xml
		String xmlPath = webPath.getWebPhysicsPath() + "/conf/" + systemName + ".xml";
		File file = new File(xmlPath);
		if (!file.exists()) {//假如在指定的位置不存在Xml，则默认的Xml文件夹为工程项目文件夹下的/WEB-INF/config-servlet.xml
			xmlPath = webPath.getWebPhysicsPath() + "/WEB-INF/config-servlet.xml";
		}
		return xmlPath;
	}
	/**
	 * 销毁
	 */
	public void destroy() {

	}
}