ByteArrayOutputStream 和ByteArrayInputStream详解
2011-11-22 19:49
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ByteArrayOutputStream类是在创建它的实例时,程序内部创建一个byte型别数组的缓冲区,然后利用ByteArrayOutputStream和ByteArrayInputStream的实例向数组中写入或读出byte型数据。在网络传输中我们往往要传输很多变量,我们可以利用ByteArrayOutputStream把所有的变量收集到一起,然后一次性把数据发送出去。具体用法如下:
ByteArrayOutputStream: 可以捕获内存缓冲区的数据,转换成字节数组。
ByteArrayInputStream: 可以将字节数组转化为输入流
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![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
import java.io.*;
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![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.blogjava.net/Images/OutliningIndicators/ContractedBlock.gif)
public class test
![](http://www.blogjava.net/Images/dot.gif)
{
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![](http://www.blogjava.net/Images/OutliningIndicators/ContractedSubBlock.gif)
public static void main(String[] args)
![](http://www.blogjava.net/Images/dot.gif)
{
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
int a=0;
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
int b=1;
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
int c=2;
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
ByteArrayOutputStream bout = new ByteArrayOutputStream();
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
bout.write(a);
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
bout.write(b);
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
bout.write(c);
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
byte[] buff = bout.toByteArray();
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
for(int i=0; i<buff.length; i++)
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
System.out.println(buff[i]);
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
System.out.println("***********************");
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
ByteArrayInputStream bin = new ByteArrayInputStream(buff);
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.blogjava.net/Images/OutliningIndicators/ContractedSubBlock.gif)
while((b=bin.read())!=-1)
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{
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
System.out.println(b);
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
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![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
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![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
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![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
如上所示,ByteArrayOutputStream把内存中的数据读到字节数组中,而ByteArrayInputStream又把字节数组中的字节以流的形式读出,实现了对同一个字节数组的操作.
综合DataOutputStream&DataInputStream的作用和功能,与ByteArrayOutputStream和ByteArrayInputSream使用将更方便.此时DataOutputStream&DataInputStream封闭了字节流,以适当的形式读出了字节数组中的数据.如下所示:
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![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
import java.io.*;
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![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.blogjava.net/Images/OutliningIndicators/ContractedBlock.gif)
public class test
![](http://www.blogjava.net/Images/dot.gif)
{
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.blogjava.net/Images/OutliningIndicators/ContractedSubBlock.gif)
public static void main(String[] args)throws IOException
![](http://www.blogjava.net/Images/dot.gif)
{
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
ByteArrayOutputStream bout = new ByteArrayOutputStream();
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
DataOutputStream dout = new DataOutputStream(bout);
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
String name = "xxy";
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
int age = 84;
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
dout.writeUTF(name);
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
dout.writeInt(age);
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
byte[] buff = bout.toByteArray();
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
ByteArrayInputStream bin = new ByteArrayInputStream(buff);
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
DataInputStream dis = new DataInputStream(bin);
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
String newName = dis.readUTF();
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
int newAge = dis.readInt();
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif)
System.out.println(newName+":"+newAge);
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
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