IO字节流四种方式复制文件

 1 package com.qyh.io;
 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 
 9 /*
10  * 字节流四种方式复制文件
11  * 基本字节流一次读取一个字节
12  * 基本字节流一次读取一个字节数组
13  * 高效字节流一次读取一个字节
14  * 高效字节流一次读取一个字节数组
15  */
16 
17 public class CopyImageDemo {
18     public static void main(String[] args) throws IOException {
19         method1("d:\兔子.jpg","copy1.jpg");
20         method2("d:\兔子.jpg","copy2.jpg");
21         method3("d:\兔子.jpg","copy3.jpg");
22         method4("d:\兔子.jpg","copy4.jpg");
23     }
24     
25     
26     //高效字节流一次读取一个字节数组
27     private static void method4(String srcString,String destString ) throws IOException {
28         //封装数据源
29         BufferedInputStream bis = new BufferedInputStream(new FileInputStream(srcString));
30         //封装目的地
31         BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(destString));
32         
33         byte[] bys = new byte[1024];
34         int len = 0;
35         while((len=bis.read(bys))!=-1) {
36             bos.write(bys, 0, len);
37         }
38         bos.close();
39         bis.close();
40         
41     }
42     
43     
44     // 高效字节流一次读取一个字节
45     private static void method3(String srcString , String destString ) throws IOException {
46         //封装数据源
47         BufferedInputStream bis = new BufferedInputStream(new FileInputStream(srcString));
48         //封装目的地
49         BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(destString));
50         
51         int by = 0;
52         while((by=bis.read())!=-1) {
53             bos.write(by);
54         }
55         bos.close();
56         bis.close();
57     }
58 
59     //基本字节流一次读取一个字节数组
60     private static void method2(String srcString , String destString) throws IOException {
61         //封装数据源
62         FileInputStream fis = new FileInputStream(srcString);
63         //封装目的地
64         FileOutputStream fos = new FileOutputStream(destString);
65         
66         byte[] bys = new byte[1024];
67         int len = 0;
68         while((len=fis.read(bys))!=-1) {
69             fos.write(bys, 0, len);
70         }
71         fos.close();
72         fis.close();
73         
74         
75     }
76 
77     // 基本字节流一次读取一个字节
78     private static void method1(String srcString,String destString) throws IOException {
79         //封装数据源
80         FileInputStream fis = new FileInputStream(srcString);
81         //封装目的地
82         FileOutputStream fos = new FileOutputStream(destString);
83         
84         int by = 0;
85         while((by=fis.read())!=-1) {
86             fos.write(by);
87             
88         }
89         fos.close();
90         fis.close();                    
91     }
92 
93 }
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