如何将文本文件的内容全部读出，并存在字符串中？

[lashengcrh]

如题

[Kreocn]

try {
			BufferedReader bf = new BufferedReader(new InputStreamReader(new FileInputStream("D:/test.txt")));
			String a = "";
			String tmp = "";
			while((tmp=bf.readLine())!=null) {
				a = a + tmp;
			}
			System.out.println(a);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}