JavaIO拷贝文件示例

2018-06-18 02:48:42来源：未知阅读 ()

 1 package cn.com.demo;
 2 
 3 import java.io.BufferedInputStream;
 4 import java.io.BufferedOutputStream;
 5 import java.io.FileInputStream;
 6 import java.io.FileOutputStream;
 7 import java.io.IOException;
 8 import java.io.InputStream;
 9 import java.io.OutputStream;
10 
11 public class StreamDemo {
12 
13     public static void main(String[] args) {
14         StreamDemo streamDemo = new StreamDemo();
15         try {
16             String srcFile = "E:\\资料\\javaEE 5.0.chm";
17             String tarFile = "E:\\资料\\javaEE 5.0（2）.chm";
18             streamDemo.copyFile(srcFile,tarFile);
19         } catch (Exception e) {
20             e.printStackTrace();
21         }
22         
23     }
24     /**
25      * 拷贝文件，使用带缓冲功能的BufferedInputStream和BufferedOutputStream
26      * @param srcFile
27      * @param tarFile
28      * @throws IOException
29      */
30     public void copyFile(String srcFile, String tarFile) throws IOException {
31         InputStream input = null;
32         BufferedInputStream buffInput = null;
33         OutputStream output = null;
34         BufferedOutputStream buffOutput=null;
35         try {
36             byte[] buffer = new byte[1024];
37             int length = 0;
38             input = new FileInputStream(srcFile);
39             buffInput = new BufferedInputStream(input);
40             output = new FileOutputStream(tarFile);
41             buffOutput = new BufferedOutputStream(output);
42             while ((length = buffInput.read(buffer)) > 0) {
43                 buffOutput.write(buffer,0,length);
44             }
45             buffOutput.flush();
46         } catch (Exception e) {
47             throw new RuntimeException(e.getMessage());
48         } finally{
49             if (input != null){
50                 input.close();
51                 input=null;
52             }
53             if (buffInput != null){
54                 buffInput.close();
55                 buffInput=null;
56             }
57             if (output != null){
58                 output.flush();
59                 output.close();
60                 output=null;
61             }
62             if (buffOutput != null){
63                 buffOutput.close();
64                 buffOutput=null;
65             }
66         }
67         
68     }
69 }