获取当前类的所在工程路径;
如果不加“/”
File f = new File(this.getClass().getResource("").getPath());
System.out.println(f);
结果：C:\Documents%20and%20Settings\Administrator\workspace\projectName\bin\com\test


获取当前类的绝对路径；
第二种：File directory = new File("");//参数为空
String courseFile = directory.getCanonicalPath() ;
System.out.println(courseFile);
结果：C:\Documents and Settings\Administrator\workspace\projectName


获取当前类的所在工程路径;
第三种：URL xmlpath = this.getClass().getClassLoader().getResource("selected.txt");
System.out.println(xmlpath);
结果：file:/C:/Documents%20and%20Settings/Administrator/workspace/projectName/bin/selected.txt


获取当前工程src目录下selected.txt文件的路径
第四种：System.out.println(System.getProperty("user.dir"));
结果：C:\Documents and Settings\Administrator\workspace\projectName


获取当前工程路径第五种：System.out.println( System.getProperty("java.class.path"));
结果：C:\Documents and Settings\Administrator\workspace\projectName\bin
获取当前工程路径