SAXReader

说明:SAXReader主要用于解析XML文件,是当前比较流行的xml解决方案.

 

代码以基础类函数的形式展现如下:

java 代码

package com.dc.framework.taglib;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.commons.lang.StringUtils;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;


//自定义标签处理类
public class ReadUploadFile {
    // 配置文件的路径
    static String uploadCfgFile = "WEB-INF/conf/uploadfile.xml";
    //文档对象实体
    Document uploadDocument = null;
    //结果存储体
    Map uploadMap = new HashMap();

 /**
  * @param request
  * @return
  * 获取配置文件绝对路径
  */
 private String getuploadCfgFile(ServletRequest request) {
      return ((HttpServletRequest) request).getSession().getServletContext().getRealPath(uploadCfgFile);
 }

 /**
  * @param request
  * @return
  * 初始化配置文件
  */
 private Document inituploadCfgDocument(ServletRequest request) {
      SAXReader saxReader = new SAXReader();
      try {
          //得到指定文件以流的形式对文件进行序列化
          FileInputStream fis = new FileInputStream(getuploadCfgFile(request));
          uploadDocument = saxReader.read(fis);
      }
      catch (DocumentException e) {
          e.printStackTrace();
      }
      catch(FileNotFoundException fnfe){
          fnfe.printStackTrace();
      }
      return uploadDocument;
 }

 /**
  * 获取配置文件
  *
  * @param request
  * @return
  */
 private Document getuploadCfgDocument(ServletRequest request) {
      if (this.uploadDocument == null) {
          this.uploadDocument = inituploadCfgDocument(request);
      }
      return this.uploadDocument;
 }

 /**
  * @param request
  * @return
  * 获取某个指定preparents的配置属性
  */
 public Map getuploadMap(ServletRequest request) {
     //xml中的访问路径,说明欲处理XML文件的根元素是fileaction-configuration
     String xPath = "//fileaction-configuration/preparents";
     //获取按照指定搜索路径得到的元素列表,这里指获取所有的fileaction-configuration下的preparents元素
     List result = getuploadCfgDocument(request).selectNodes(xPath);
     //属性和指定子元素的存储体
     Map uploadMap = new HashMap();
     //遍历所得元素
     Iterator iter = result.iterator();
     while (iter.hasNext()) {
         //获得具体的preparents元素
         Element preparents = (Element) iter.next();
         // 取得preparents元素的id属性的值
         String id2 = preparents.attributeValue("id");
         // 取得preparents元素下子元素tabname的值,并与id2配对存储
         uploadMap.put(id2,
            StringUtils.trim(preparents.elementText("tabname")));
      }
      return uploadMap;
}
}

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