如：

String a = "57java.txt"; File f = new File(this.getClass().getResource("").getPath() + a); if (!f.exists()) { System.out.println("不存在"); } else { Log.info(f+""); } System.out.println("获取当前类的所在工程路径; :"+f);

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