package my;

 import java.io.File;
 import java.io.IOException;
 import java.net.URL;

 public class MyUrlDemo {

    
     public static void main(String[] args) {
         MyUrlDemo muDemo = new MyUrlDemo();
         try {
             muDemo.showURL();
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

     public void showURL() throws IOException {

         // 第一種：獲取類加載的根路徑   D:/git/daotie/daotie/target/classes
         File f = new File(this.getClass().getResource("/").getPath());
         System.out.println(f);

         // 獲取當前類的所在工程路徑; 如果不加“/”  獲取當前類的加載目錄  D:/git/daotie/daotie/target/classes/my
         File f2 = new File(this.getClass().getResource("").getPath());
         System.out.println(f2);

         // 第二種：獲取項目路徑    D:/git/daotie/daotie
         File directory = new File("");// 參數為空
         String courseFile = directory.getCanonicalPath();
         System.out.println(courseFile);

 
         // 第三種：  file:/D:/git/daotie/daotie/target/classes/
         URL xmlpath = this.getClass().getClassLoader().getResource("");
         System.out.println(xmlpath);

 
         // 第四種： D:/git/daotie/daotie
         System.out.println(System.getProperty("user.dir"));
         /*
          * 結果： C:/Documents and Settings/Administrator/workspace/projectName
          * 獲取當前工程路徑
          */

         // 第五種：  獲取所有的類路徑 包括jar包的路徑
         System.out.println(System.getProperty("java.class.path"));

     }
 }