I-O流 file文件复制

 1 package com.copyfile;
 2 /**
 3  * 复制文档
 4  * 
 5  */
 6 import java.io.FileInputStream;
 7 import java.io.FileNotFoundException;
 8 import java.io.FileOutputStream;
 9 import java.io.IOException;
10 
11 public class CopyFile {
12     public static void main(String[] args) {
13         FileInputStream fis = null;//创建一个输入流
14         FileOutputStream fos = null;//创建一个输出流
15         String str = "";
16         try {
17             fis = new FileInputStream("D:/HelloWorld/Hello.java.txt");
18             fos = new FileOutputStream("D:/HelloWorld/CopyFile.txt");
19             //读取文件内容存入str
20             int temp = -1;
21             while((temp = fis.read())!=-1) {//读取完毕文件内容后的值为-1
22                 str += (char)temp;
23             }
24             System.out.println("文档已读取完毕！");
25             //将读取文件放在bytes数组中
26             byte[] bytes = str.getBytes();
27             //复制读取到的文件
28             fos.write(bytes);
29             System.out.println("文档已复制");
30             fos.flush();
31 
32         } catch (FileNotFoundException e) {
33             e.printStackTrace();
34         } catch (IOException e) {
35             e.printStackTrace();
36         } finally {
37             try {
38                 fos.close();
39                 fis.close();
40             } catch (IOException e) {
41                 e.printStackTrace();
42             }
43 
44         }
45     }
46 }