Java 文件和流

妖狐艹你老母 2022-04-16 01:05 168阅读 0赞

//下面的类里面包含了相互转化的方法：  
  
  
  
package com.abin.file.bytes;  
  
import java.io.ByteArrayInputStream;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.io.InputStream;  
  
import sun.misc.BASE64Decoder;  
import sun.misc.BASE64Encoder;  
  
public class FileToStream \{  
  
//文件转化为流  
public String FileTurnStream(String path)\{  
String fileByte="";  
try\{  
InputStream in=new FileInputStream(path);  
// in.available()返回文件的字节长度  
byte\[\] bytes=new byte\[in.available()\];  
// 将文件中的内容读入到数组中  
in.read(bytes);  
fileByte=new BASE64Encoder().encode(bytes);  
  
// fileByte=bytes.toString();  
in.close();  
\}catch(Exception e)\{  
e.printStackTrace();  
\}  
return fileByte;  
\}  
  
  
public void StreamToFile(String byteto)\{  
String fileName="E:/Emotion/test/varyall.jpg";  
try \{  
byte\[\] bytes=new BASE64Decoder().decodeBuffer(byteto);  
ByteArrayInputStream in=new ByteArrayInputStream(bytes);  
byte\[\] buffer=new byte\[1024\];  
FileOutputStream out=new FileOutputStream(fileName);  
int bytesum=0;  
int byteread=0;  
while((byteread=in.read(buffer))!=-1)\{  
bytesum+=byteread;  
out.write(buffer,0,byteread);  
out.flush();  
\}  
out.close();  
  
\} catch (Exception e) \{  
// TODO: handle exception  
\}  
\}  
  
  
\}  
  
  
  
  
  
  
  
  
Junit测试类：  
  
package com.abin.file.bytes;  
  
import junit.framework.TestCase;  
import sun.misc.BASE64Decoder;  
  
public class TestFileToStream extends TestCase\{  
  
public void testStream()throws Exception\{  
String frompath="E:/Emotion/Photo/abin.jpg";  
String bytes=new FileToStream().FileTurnStream(frompath);  
System.out.println("文件开始转化为流");  
System.out.println("接收到的没有解码字节流："+bytes);  
System.out.println("接收到的解码字节流："+new BASE64Decoder().decodeBuffer(bytes));  
System.out.println("文件转化为流结束");  
  
System.out.println("流开始转化为文件");  
  
new FileToStream().StreamToFile(bytes);  
  
System.out.println("流转化为文件已经结束");  
  
\}  
  
\}