[Java工具] 序列化工具

依赖

<dependency>
    <groupId>com.dyuproject.protostuff</groupId>
    <artifactId>protostuff-core</artifactId>
    <version>1.0.8</version>
</dependency>
<dependency>
    <groupId>com.dyuproject.protostuff</groupId>
    <artifactId>protostuff-runtime</artifactId>
    <version>1.0.8</version>
</dependency>

工具类

package com.yingjun.ssm.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.List;
import com.dyuproject.protostuff.LinkedBuffer;
import com.dyuproject.protostuff.ProtostuffIOUtil;
import com.dyuproject.protostuff.Schema;
import com.dyuproject.protostuff.runtime.RuntimeSchema;

/**
 * 序列化工具
 * 使用 Protostuff 开源库
 * @注意 1. 被序列化的对象的内部字段不可改变(新增,减少,改名等)，否则会出现问题
 *        2. 未测试在序列化附带嵌套对象的对象时是否会出现问题
 * @autho https://github.com/wosyingjun/beauty_ssm
 */
public class ProtoStuffSerializerUtil {

    /**
     * 序列化对象
     * @param obj
     * @return
     */
    public static <T> byte[] serialize(T obj) {
        if (obj == null) {
            throw new RuntimeException("序列化对象(" + obj + ")!");
        }
        @SuppressWarnings("unchecked")
        Schema<T> schema = (Schema<T>) RuntimeSchema.getSchema(obj.getClass());
        LinkedBuffer buffer = LinkedBuffer.allocate(1024 * 1024);
        byte[] protostuff = null;
        try {
            protostuff = ProtostuffIOUtil.toByteArray(obj, schema, buffer);
        } catch (Exception e) {
            throw new RuntimeException("序列化(" + obj.getClass() + ")对象(" + obj + ")发生异常!", e);
        } finally {
            buffer.clear();
        }
        return protostuff;
    }

    /**
     * 反序列化对象
     * @param paramArrayOfByte
     * @param targetClass
     * @return
     */
    public static <T> T deserialize(byte[] paramArrayOfByte, Class<T> targetClass) {
        if (paramArrayOfByte == null || paramArrayOfByte.length == 0) {
            throw new RuntimeException("反序列化对象发生异常,byte序列为空!");
        }
        T instance = null;
        try {
            instance = targetClass.newInstance();//依据class建立新实例
        } catch (InstantiationException | IllegalAccessException e) {
            throw new RuntimeException("反序列化过程中依据类型创建对象失败!", e);
        }
        //RuntimeSchema.getSchema()方法线程安全且自带缓存
        Schema<T> schema = RuntimeSchema.getSchema(targetClass);
        ProtostuffIOUtil.mergeFrom(paramArrayOfByte, instance, schema);
        return instance;
    }

    /**
     * 序列化列表
     * @param objList
     * @return
     */
    public static <T> byte[] serializeList(List<T> objList) {
        if (objList == null || objList.isEmpty()) {
            throw new RuntimeException("序列化对象列表(" + objList + ")参数异常!");
        }
        @SuppressWarnings("unchecked")
        Schema<T> schema = (Schema<T>) RuntimeSchema.getSchema(objList.get(0).getClass());
        LinkedBuffer buffer = LinkedBuffer.allocate(1024 * 1024);
        byte[] protostuff = null;
        ByteArrayOutputStream bos = null;
        try {
            bos = new ByteArrayOutputStream();
            ProtostuffIOUtil.writeListTo(bos, objList, schema, buffer);
            protostuff = bos.toByteArray();
        } catch (Exception e) {
            throw new RuntimeException("序列化对象列表(" + objList + ")发生异常!", e);
        } finally {
            buffer.clear();
            try {
                if (bos != null) {
                    bos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return protostuff;
    }

    /**
     * 反序列化列表
     * @param paramArrayOfByte
     * @param targetClass
     * @return
     */
    public static <T> List<T> deserializeList(byte[] paramArrayOfByte, Class<T> targetClass) {
        if (paramArrayOfByte == null || paramArrayOfByte.length == 0) {
            throw new RuntimeException("反序列化对象发生异常,byte序列为空!");
        }

        Schema<T> schema = RuntimeSchema.getSchema(targetClass);
        List<T> result = null;
        try {
            result = ProtostuffIOUtil.parseListFrom(new ByteArrayInputStream(paramArrayOfByte), schema);
        } catch (IOException e) {
            throw new RuntimeException("反序列化对象列表发生异常!", e);
        }
        return result;
    }

}

待解决

• 被序列化的对象的内部字段不可改变(新增,减少,改名等)，否则会出现问题
• 未测试在序列化附带嵌套对象的对象时是否会出现问题

参考&来源

优雅的SSM（Spring+SpringMVC+Mybatis）框架
Protostuff序列化和反序列化