第一種：獲取當前類的絕對路徑；
如果不加“/”

File f = new File(this.getClass().getResource("").getPath());
System.out.println(f);

結果：C:\Documents%20and%20Settings\Administrator\workspace\projectName\bin\com\test

第二種：獲取當前類的所在工程路徑;

File directory = new File("");//引數為空
String courseFile = directory.getCanonicalPath() ;
System.out
 
.println(courseFile);

結果：C:\Documents and Settings\Administrator\workspace\projectName

第三種：獲取當前工程src目錄下selected.txt檔案的路徑

URL xmlpath = this.getClass().getClassLoader().getResource("selected.txt");
System.out.println(xmlpath);

結果：file:/C:/Documents%20and%20Settings/Administrator/workspace/projectName/bin/selected.txt

第四種：獲取當前工程路徑

System.out.println(System.getProperty("user.dir"));

結果：C:\Documents and Settings\Administrator\workspace\projectName

第五種：獲取當前工程路徑

System.out.println( System.getProperty("java.class.path"));

結果：C:\Documents and Settings\Administrator\workspace\projectName\bin