1 package test;
2
3 import java.io.BufferedReader;
4 import java.io.FileReader;
5 import java.io.IOException;
6
7
8 public class IOTest {
9 public String getTt(String file){
10 StringBuffer str = new StringBuffer();
11 BufferedReader reder = null;
12 try {
13 reder = new BufferedReader(new FileReader("jiao"+file+".txt"));
14 String s = null;
15 int len =1;
16 while((s = reder.readLine())!=null ){
17 str.append(s.trim());
18 }
19
20 } catch (Exception e) {
21 e.printStackTrace();
22 } finally{
23 try {
24 reder.close();
25 } catch (IOException e) {
26 e.printStackTrace();
27 }
28 }
29 if("".equals(str.toString())){
30 return null;
31 }
32 return str.toString();
33 }
34
35 public static void main(String[] args) {
36 IOTest i = new IOTest();
37 String s = i.getTt("2");
38 System.out.println(s);
39 }
40 }
