ByteArrayOutputStream:
ByteArrayInputStream: 可以将字节数组转化为输入流
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import java.io.*;
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public class test {
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public static void main(String[] args) {
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int a=0;
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int b=1;
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int c=2;
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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bout.write(a);
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bout.write(b);
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bout.write(c);
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byte[] buff = bout.toByteArray();
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for(int i=0; i<buff.length; i++)
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System.out.println(buff[i]);
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System.out.println("***********************");
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ByteArrayInputStream bin = new ByteArrayInputStream(buff);
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while((b=bin.read())!=-1) {
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System.out.println(b);
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}
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}
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}
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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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import java.io.*;
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public class test {
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public static void main(String[] args)throws IOException {
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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DataOutputStream dout = new DataOutputStream(bout);
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String name = "xxy";
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int age = 84;
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dout.writeUTF(name);
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dout.writeInt(age);
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byte[] buff = bout.toByteArray();
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ByteArrayInputStream bin = new ByteArrayInputStream(buff);
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DataInputStream dis = new DataInputStream(bin);
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String newName = dis.readUTF();
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int newAge = dis.readInt();
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System.out.println(newName+":"+newAge);
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}
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}

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