Protostuff序列化和反序列化的使用说明

大家都知道protobuf好用，可是在网上找到的netty整合protobuf的文章都是千篇一律，自己编写proto文件然后使用工具转java文件用起来复杂麻烦，经过不懈努力终于找到了一个简单的方法希望大家喜欢。

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'}

总结

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