java StringBuffer读写文件

 1 import java.io.*;
 2 
 3 public class FileIO_StringBuffer {
 4     public static void main(String[] args) {
 5         //读文件到Stringbuffer 
 6         StringBuffer sb = new StringBuffer();
 7         String sourcePath = "C:\\Users\\Administrator\\Desktop\\1.txt";//源文件路径(*.*)
 8         BufferedReader br = null;
 9         try {
10             br = new BufferedReader(new FileReader(sourcePath));
11             String str;
12             while((str = br.readLine()) != null) {//逐行读取
13                 sb.append(str);//加在StringBuffer尾
14                 sb.append("\r\n");//行尾 加换行符
15             }
16             br.close();//别忘记，切记
17         }
18         catch(Exception e){
19             System.out.println(e.getMessage());
20         }
21         
22         //写入文件
23         String targetPath = "C:\\Users\\Administrator\\Desktop\\2.txt";//目标文件路径
24         File f = new File(targetPath);//新建文件
25         try {
26             BufferedWriter bw = new BufferedWriter(new FileWriter(f));
27             bw.write(sb.toString());
28             bw.flush();
29             bw.close();
30         }
31         catch(Exception e) {
32             System.out.println(e.getMessage());
33         }
34     }
35 }