java 讀取本地文件實例詳解
用javax.xml、w3c解析
實例代碼：
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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; // 可以使用絕對路勁 File f = new File("D:/workspace-idea/monitor-service/src/main/resources/logMonitor.xml"); // documentBuilder為抽象不能直接實例化(將XML文件轉(zhuǎn)換為DOM文件) DocumentBuilder db = null; DocumentBuilderFactory dbf = null; try { // 返回documentBuilderFactory對象 dbf = DocumentBuilderFactory.newInstance(); // 返回db對象用documentBuilderFatory對象獲得返回documentBuildr對象 db = dbf.newDocumentBuilder(); // 得到一個DOM并返回給document對象 Document dt = db.parse(f); // 得到一個elment根元素 element = dt.getDocumentElement(); // 獲得根節(jié)點(diǎn) System.out.println("根元素：" + element.getNodeName()); }catch (Exception e ){ e.printStackTrace(); } }} |
用dom4j解析
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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：本地絕對路徑獲取xml文件內(nèi)容，項目外的路徑 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:項目絕對路徑是在本class文件所在項目的根目錄下找，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：相對目錄，在本ReadFileTest編譯后的.class文件同級目錄 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：相對目錄，在本ReadFileTest編譯后的.class文件上級目錄的config目錄下 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：動態(tài)獲取相對目錄 try { String xmlPath = "logMonitor.xml"; //獲取當(dāng)前類加載的根目錄，如：/C:/Program Files/Apache/Tomcat 6.0/webapps/fee/WEB-INF/classes/ String path = ReadFileTest.class.getClassLoader().getResource("").toURI().getPath(); // 把文件讀入文件輸入流，存入內(nèi)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(); } }} |
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原文鏈接：http://blog.csdn.net/jiyingying_up/article/details/69396501
