利用java如何实现读取本地文件

package cn.com.xinli.monitor.utils;    import org.w3c.dom.Document;  import org.w3c.dom.Element;    import javax.xml.parsers.DocumentBuilder;  import javax.xml.parsers.DocumentBuilderFactory;  import java.io.File;  /**   * Created by jiyy on 2017/4/6.   */  public class ReadXmlTest {      public static void main(String[] args){        Element element = null;      // 可以使用绝对路劲      File f = new File("D:/workspace-idea/monitor-service/src/main/resources/logMonitor.xml");      // documentBuilder为抽象不能直接实例化(将XML文件转换为DOM文件)      DocumentBuilder db = null;      DocumentBuilderFactory dbf = null;      try {        // 返回documentBuilderFactory对象        dbf = DocumentBuilderFactory.newInstance();        // 返回db对象用documentBuilderFatory对象获得返回documentBuildr对象        db = dbf.newDocumentBuilder();        // 得到一个DOM并返回给document对象        Document dt = db.parse(f);        // 得到一个elment根元素        element = dt.getDocumentElement();        // 获得根节点        System.out.println("根元素：" + element.getNodeName());      }catch (Exception e ){        e.printStackTrace();      }    }    }

package cn.com.xinli.monitor.test;    import org.apache.commons.io.IOUtils;  import org.dom4j.Document;  import org.dom4j.DocumentException;  import org.dom4j.DocumentHelper;    import java.io.File;  import java.io.FileInputStream;  import java.io.IOException;  import java.io.InputStream;  import java.net.URISyntaxException;    /**   * Created by jiyy on 2017/4/6.   */  public class ReadFileTest {      public static void main(String[] args){          //方法一：本地绝对路径获取xml文件内容，项目外的路径      String fileUrl = "/D:/workspace-idea/monitor-service/src/main/resources/logMonitor.xml";      InputStream fis = null;      try {          fis = new FileInputStream(new File(fileUrl));        String content = IOUtils.toString(fis,"UTF-8");        Document document = DocumentHelper.parseText(content);      } catch (java.io.IOException e) {        e.printStackTrace();      } catch (DocumentException e) {        e.printStackTrace();      }        //方法二:项目绝对路径是在本class文件所在项目的根目录下找，也就是classes/下      try {        String content2 = IOUtils.toString(ReadFileTest.class.getResourceAsStream("/logMonitor.xml"), "UTF-8");        Document document2 = DocumentHelper.parseText(content2);      } catch (IOException e) {        e.printStackTrace();      }catch (DocumentException e) {        e.printStackTrace();      }      //方法三：相对目录，在本ReadFileTest编译后的.class文件同级目录      try {        String content3 = IOUtils.toString(ReadFileTest.class.getResourceAsStream("logMonitor.xml"), "UTF-8");        Document document3 = DocumentHelper.parseText(content3);      } catch (IOException e) {        e.printStackTrace();      }catch (DocumentException e) {        e.printStackTrace();      }      //方法四：相对目录，在本ReadFileTest编译后的.class文件上级目录的config目录下      try {        String content4 = IOUtils.toString(ReadFileTest.class.getResourceAsStream("../config/logMonitor.xml"), "UTF-8");        Document document4 = DocumentHelper.parseText(content4);      } catch (IOException e) {        e.printStackTrace();      }catch (DocumentException e) {        e.printStackTrace();      }      //方法五：动态获取相对目录      try {        String xmlPath = "logMonitor.xml";        //获取当前类加载的根目录，如：/C:/Program Files/Apache/Tomcat 6.0/webapps/fee/WEB-INF/classes/        String path = ReadFileTest.class.getClassLoader().getResource("").toURI().getPath();        // 把文件读入文件输入流，存入内存中        FileInputStream in = new FileInputStream(new File(path + xmlPath));        String content5 = IOUtils.toString(in,"UTF-8");        Document document5 = DocumentHelper.parseText(content5);      } catch (IOException e) {        e.printStackTrace();      } catch (DocumentException e) {        e.printStackTrace();      }catch (URISyntaxException e) {        e.printStackTrace();      }    }  }