Hadoop序列化与反序列化具体实践

首先创建两个类

两个类的代码

Student类：

import org.apache.hadoop.io.Writable;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

public class Student implements Writable {
    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public Student() {
    }

    public String name;
    public int age;

    @Override
    public void write(DataOutput dataOutput) throws IOException {
        dataOutput.writeUTF(name);
        dataOutput.writeInt(age);
    }

    @Override
    public void readFields(DataInput dataInput) throws IOException {
        name = dataInput.readUTF();
        age = dataInput.readInt();
    }
}

TestStudent类：

import java.io.*;

public class TestStudent {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        Student student = new Student("小花", 18);

        // hadoop序列化
        DataOutputStream dos = new DataOutputStream(new FileOutputStream("Student_hadoop.txt"));
        student.write(dos);

        // hadoop 反序列化
        DataInputStream dis = new DataInputStream(new FileInputStream("Student_hadoop.txt"));
        Student student1 = new Student();
        student1.readFields(dis);
        System.out.println(student1.name+ " "+student1.age);
    }
}