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import
java.io.ByteArrayOutputStream;import
java.io.File;import
java.io.FileInputStream;import
java.io.FileOutputStream;import
java.io.IOException;public
class FileHelper {//第一种获取文件内容方式 public
byte[] getContent(String filePath) throws
IOException { File file = new
File(filePath); long
fileSize = file.length(); if
(fileSize > Integer.MAX_VALUE) { System.out.println("file too big..."); return
null; } FileInputStream fi = new
FileInputStream(file); byte[] buffer = new
byte[(int) fileSize]; int
offset = 0; int
numRead = 0; while
(offset < buffer.length && (numRead = fi.read(buffer, offset, buffer.length - offset)) >= 0) { offset += numRead; } // 确保所有数据均被读取 if
(offset != buffer.length) { throw
new IOException("Could not completely read file " + file.getName()); } fi.close(); return
buffer; } //第二种获取文件内容方式 public
byte[] getContent2(String filePath) throws
IOException { FileInputStream in=new
FileInputStream(filePath); ByteArrayOutputStream out=new
ByteArrayOutputStream(1024); System.out.println("bytes available:"+in.available()); byte[] temp=new
byte[1024]; int
size=0; while((size=in.read(temp))!=-1) { out.write(temp,0,size); } in.close(); byte[] bytes=out.toByteArray(); System.out.println("bytes size got is:"+bytes.length); return
bytes; } //将byte数组写入文件 public
void createFile(String path, byte[] content) throws
IOException { FileOutputStream fos = new
FileOutputStream(path); fos.write(content); fos.close(); }} |
原文：http://www.cnblogs.com/yujian-bcq/p/3584624.html