ByteArrayOutputStream和ByteArrayInputStream详解
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:
ByteArrayInputStream: 可以将字节数组转化为输入流
1import java.io.*;
2
3public class test {
4 public static void main(String[] args) {
5 int a=0;
6 int b=1;
7 int c=2;
8 ByteArrayOutputStream bout = new ByteArrayOutputStream();
9 bout.write(a);
10 bout.write(b);
11 bout.write(c);
12 byte[] buff = bout.toByteArray();
13 for(int i=0; i<buff.length; i++)
14 System.out.println(buff[i]);
15 System.out.println("***********************");
16 ByteArrayInputStream bin = new ByteArrayInputStream(buff);
17 while((b=bin.read())!=-1) {
18 System.out.println(b);
19 }
20 }
21}
22
23
24
2
3public class test {
4 public static void main(String[] args) {
5 int a=0;
6 int b=1;
7 int c=2;
8 ByteArrayOutputStream bout = new ByteArrayOutputStream();
9 bout.write(a);
10 bout.write(b);
11 bout.write(c);
12 byte[] buff = bout.toByteArray();
13 for(int i=0; i<buff.length; i++)
14 System.out.println(buff[i]);
15 System.out.println("***********************");
16 ByteArrayInputStream bin = new ByteArrayInputStream(buff);
17 while((b=bin.read())!=-1) {
18 System.out.println(b);
19 }
20 }
21}
22
23
24
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:
1import java.io.*;
2
3public class test {
4 public static void main(String[] args)throws IOException {
5 ByteArrayOutputStream bout = new ByteArrayOutputStream();
6 DataOutputStream dout = new DataOutputStream(bout);
7 String name = "xxy";
8 int age = 84;
9 dout.writeUTF(name);
10 dout.writeInt(age);
11 byte[] buff = bout.toByteArray();
12 ByteArrayInputStream bin = new ByteArrayInputStream(buff);
13 DataInputStream dis = new DataInputStream(bin);
14 String newName = dis.readUTF();
15 int newAge = dis.readInt();
16 System.out.println(newName+":"+newAge);
17 }
18}
2
3public class test {
4 public static void main(String[] args)throws IOException {
5 ByteArrayOutputStream bout = new ByteArrayOutputStream();
6 DataOutputStream dout = new DataOutputStream(bout);
7 String name = "xxy";
8 int age = 84;
9 dout.writeUTF(name);
10 dout.writeInt(age);
11 byte[] buff = bout.toByteArray();
12 ByteArrayInputStream bin = new ByteArrayInputStream(buff);
13 DataInputStream dis = new DataInputStream(bin);
14 String newName = dis.readUTF();
15 int newAge = dis.readInt();
16 System.out.println(newName+":"+newAge);
17 }
18}
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