import java.io.ByteArrayInputStream;

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import java.io.ByteArrayOutputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import org.apache.hadoop.io.IntWritable;

import org.apache.hadoop.io.ShortWritable;

import org.junit.Test;

public class TestWritable {

/*

* test writable

*/

@Test

public void test1() throws Exception {

IntWritable age = new IntWritable();

age.set(163);

ByteArrayOutputStream baos = new ByteArrayOutputStream();

DataOutputStream dataOut = new DataOutputStream(baos);

// 序列化

age.write(dataOut);

dataOut.close();

byte[] bts = baos.toByteArray();

for (byte by : bts) {

System.out.println(by);

}

System.out.println(bts.toString());

// 反序列化

IntWritable age2 = new IntWritable();

age2.readFields(new DataInputStream(new ByteArrayInputStream(baos

.toByteArray())));

System.out.println(age2.get());

ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());

DataInputStream dis = new DataInputStream(bais);

System.out.println(dis.readInt());

// //测试用short类型方式的读取

// ShortWritable short1 = new ShortWritable();

// short1.readFields(dis);

// System.out.println(short1.get());

// ShortWritable short2 = new ShortWritable();

// short2.readFields(dis);

// System.out.println(short2.get());

}

}

文章标题：Hadoop学习--int类型的序列化和反序列化--day07
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