java io工具 文件转二进制byte数组

把文件输入流读进 byte数组，返回

 1 package io;
 2 
 3 import java.io.BufferedInputStream;
 4 import java.io.File;
 5 import java.io.FileInputStream;
 6 import java.io.FileNotFoundException;
 7 import java.io.IOException;
 8 
 9 public class BinaryFile {
10     
11     public static byte[] read(File f) throws IOException{
12         BufferedInputStream bf = new BufferedInputStream
13                                     (new FileInputStream(f));
14         //获取文件输入流
15         try {
16             byte[] data =  new byte[bf.available()];
17             //          available()   返回估计读取的字节数
18             bf.read(data);
19             return data;
20         } finally {
21             bf.close();
22         } 
23     }    
24     
25     
26     public static byte[] read(String f) throws IOException{
27             return read(new File(f));
28             
29     }
30     
31     
32     
33     
34 
35 }