java 文件操作之byte数组间的转换

java 文件操作之byte数组间的转换，本博客针对文本文件而写的，原先在网上找的有几个例子，但是

在获取文本内容时有乱码，自己又重新修改了点东西。具体代码如下

package com.file.until;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

public class FileHelper {

/**

* 获取文件内容方式

* @param filePath

* @return

* @throws IOException

*/

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;

}

/**

* 获取文件内容方式

* @param filePath

* @return

* @throws IOException

*/

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

* @param path

* @param content

* @throws IOException

*/

public void createFile(String path, byte[] content) throws IOException {

FileOutputStream fos = new FileOutputStream(path);

fos.write(content);

fos.close();

}

}