Protostuff序列化和反序列化使用说明

大家好，又见面了，我是你们的朋友全栈君。

google原生的protobuffer使用起来相当麻烦，首先要写.proto文件，然后编译.proto文件，生成对应的.java文件，鄙人试了一次，发现真的很麻烦。而protostuff的官方网站(http://www.protostuff.io/documentation/runtime-schema/)，对于智商比较低的小编来说也略显生涩，于是鄙人就根据项目中用到的protostuff，撰写此文，以方便自己和他人加深印象和学习。

1.实战

1.maven依赖：

        <dependency>
            <groupId>io.protostuff</groupId>
            <artifactId>protostuff-core</artifactId>
            <version>1.4.0</version>
        </dependency>

        <dependency>
            <groupId>io.protostuff</groupId>
            <artifactId>protostuff-runtime</artifactId>
            <version>1.4.0</version>
        </dependency>

2.ProtoBufUtil工具类:ProtoBufUtil.java

import io.protostuff.LinkedBuffer;
import io.protostuff.ProtobufIOUtil;
import io.protostuff.ProtostuffIOUtil;
import io.protostuff.Schema;
import io.protostuff.runtime.RuntimeSchema;

/**
 * Created by zhangzh on 2017/2/20.
 */
public class ProtoBufUtil {
    public ProtoBufUtil() {
    }

    public static <T> byte[] serializer(T o) {
        Schema schema = RuntimeSchema.getSchema(o.getClass());
        return ProtobufIOUtil.toByteArray(o, schema, LinkedBuffer.allocate(256));
    }

    public static <T> T deserializer(byte[] bytes, Class<T> clazz) {

        T obj = null;
        try {
            obj = clazz.newInstance();
            Schema schema = RuntimeSchema.getSchema(obj.getClass());
            ProtostuffIOUtil.mergeFrom(bytes, obj, schema);
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

        return obj;
    }
}

  3. bean类Student.java:    

import io.protostuff.Tag;

/**
 * Created by zhangzh on 2017/2/20.
 */
public class Student {

    @Tag(1)
    private String name;
    @Tag(2)
    private String studentNo;
    @Tag(3)
    private int age;
    @Tag(4)
    private String schoolName;

   // 关于@Tag,要么所有属性都有@Tag注解,要么都没有,不能一个类中只有部分属性有@Tag注解

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getStudentNo() {
        return studentNo;
    }

    public void setStudentNo(String studentNo) {
        this.studentNo = studentNo;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getSchoolName() {
        return schoolName;
    }

    public void setSchoolName(String schoolName) {
        this.schoolName = schoolName;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", studentNo='" + studentNo + '\'' +
                ", age=" + age +
                ", schoolName='" + schoolName + '\'' +
                '}';
    }
}

3.test类ProtoBufUtilTest.java:  

import java.util.Arrays;

/**
 * Created by zhangzh on 2017/2/20.
 */
public class ProtoBufUtilTest {

    public static void main(String[] args) {

        Student student = new Student();
        student.setName("lance");
        student.setAge(28);
        student.setStudentNo("2011070122");
        student.setSchoolName("BJUT");

        byte[] serializerResult = ProtoBufUtil.serializer(student);

        System.out.println("serializer result:" + Arrays.toString(serializerResult));

        Student deSerializerResult = ProtoBufUtil.deserializer(serializerResult,Student.class);

        System.out.println("deSerializerResult:" + deSerializerResult.toString());
    }

}

4.输出结果:  

serializer result:[10, 5, 108, 97, 110, 99, 101, 18, 10, 50, 48, 49, 49, 48, 55, 48, 49, 50, 50, 24, 28, 34, 4, 66, 74, 85, 84]
deSerializerResult:Student{name='lance', studentNo='2011070122', age=28, schoolName='BJUT'}

看，简单吧！

 参考资料：1. protostuff官方网站.

                     2. Protostuff序列化.