Hadoop學習--map集合序列化--day07

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import org.apache.hadoop.io.IntWritable;

import org.apache.hadoop.io.MapWritable;

import org.apache.hadoop.io.Text;

import org.junit.Test;

public class TestMapWritable {

 @Test

    public void test1() throws IOException {

MapWritable map = new MapWritable();

map.put(new IntWritable(100), new Text("tom"));

ByteArrayOutputStream baos = new ByteArrayOutputStream();

DataOutputStream dataOut = new DataOutputStream(baos);

map.write(dataOut);

dataOut.close();

MapWritable map2 = new MapWritable();

map2.readFields(new DataInputStream(new ByteArrayInputStream(baos.toByteArray())));

 

 }

}