Protostuff 序列化工具类解析

Protostuff 简介

Protostuff是一个序列化库，支持一下序列化格式：

• protobuf
• protostuff(本地)
• graph
• json
• smile
• xml
• yaml
• kvp

pom.xml 文件添加protostuff 序列化包依赖

    <!--引入protostuff依赖--> 
        <dependency> 
            <groupId>io.protostuff</groupId> 
            <artifactId>protostuff-core</artifactId> 
            <version>1.6.0</version> 
        </dependency> 
 
        <dependency> 
            <groupId>io.protostuff</groupId> 
            <artifactId>protostuff-runtime</artifactId> 
            <version>1.6.0</version> 
        </dependency>

protostuff 工具类源码：

package org.boot.protostuff.util; 
 
import io.protostuff.LinkedBuffer; 
import io.protostuff.ProtostuffIOUtil; 
import io.protostuff.Schema; 
import io.protostuff.runtime.RuntimeSchema; 
 
import java.util.Map; 
import java.util.Objects; 
import java.util.concurrent.ConcurrentHashMap; 
 
/** 
 * 
 * @author 周志刚 
 * @date 2019/6/18 
 **/ 
public class ProtostuffUtils { 
    /** 
     * 避免每次序列化都重新申请Buffer空间 
     */ 
    private static LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE); 
    /** 
     * 缓存Schema 
     */ 
    private static Map<Class<?>, Schema<?>> schemaCache = new ConcurrentHashMap<>(); 
 
    /** 
     * 序列化方法，把指定对象序列化成字节数组 
     * 
     * @param obj 
     * @param <T> 
     * @return 
     */ 
    @SuppressWarnings("unchecked") 
    public static <T> byte[] serialize(T obj) { 
        Class<T> clazz = (Class<T>) obj.getClass(); 
        Schema<T> schema = getSchema(clazz); 
        byte[] data; 
        try { 
            data = ProtostuffIOUtil.toByteArray(obj, schema, buffer); 
        } finally { 
            buffer.clear(); 
        } 
 
        return data; 
    } 
 
    /** 
     * 反序列化方法，将字节数组反序列化成指定Class类型 
     * 
     * @param data 
     * @param clazz 
     * @param <T> 
     * @return 
     */ 
    public static <T> T deserialize(byte[] data, Class<T> clazz) { 
        Schema<T> schema = getSchema(clazz); 
        T obj = schema.newMessage(); 
        ProtostuffIOUtil.mergeFrom(data, obj, schema); 
        return obj; 
    } 
 
    @SuppressWarnings("unchecked") 
    private static <T> Schema<T> getSchema(Class<T> clazz) { 
        Schema<T> schema = (Schema<T>) schemaCache.get(clazz); 
        if (Objects.isNull(schema)) { 
            //这个schema通过RuntimeSchema进行懒创建并缓存 
            //所以可以一直调用RuntimeSchema.getSchema(),这个方法是线程安全的 
            schema = RuntimeSchema.getSchema(clazz); 
            if (Objects.nonNull(schema)) { 
                schemaCache.put(clazz, schema); 
            } 
        } 
 
        return schema; 
    } 
}

序列化测试功能代码：

        //创建一个user对象 
        User user = User.builder().id("1").age(20).name("张三").desc("programmer").build(); 
        //创建一个Group对象 
        Group group = Group.builder().id("1").name("分组1").user(user).build(); 
        //使用ProtostuffUtils序列化 
        byte[] data = ProtostuffUtils.serialize(group); 
        System.out.println("序列化后：" + Arrays.toString(data)); 
        Group result = ProtostuffUtils.deserialize(data, Group.class); 
        System.out.println("反序列化后：" + result.toString());