通讯协议序列化解读（二） protostuff详解教程

<!-- //protostuff序列化 -->
	<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>  
 <!-- Objenesis -->
 <dependency>
     <groupId>org.objenesis</groupId>
     <artifactId>objenesis</artifactId>
     <version>2.1</version>
 </dependency>

package com.result.base.tools;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.objenesis.Objenesis;
import org.objenesis.ObjenesisStd;

import com.dyuproject.protostuff.LinkedBuffer;
import com.dyuproject.protostuff.ProtobufIOUtil;
import com.dyuproject.protostuff.ProtostuffIOUtil;
import com.dyuproject.protostuff.Schema;
import com.dyuproject.protostuff.runtime.RuntimeSchema;


/** 
* @author 作者 huangxinyu 
* @version 创建时间：2018年1月9日 下午7:41:24 
* Protostuff序列化工具
*/
public class SerializationUtil {
	private static Map<Class<?>, Schema<?>> cachedSchema = new ConcurrentHashMap<>();

    private static Objenesis objenesis = new ObjenesisStd(true);

    private SerializationUtil() {
    }

    @SuppressWarnings("unchecked")
    private static <T> Schema<T> getSchema(Class<T> cls) {
        Schema<T> schema = (Schema<T>) cachedSchema.get(cls);
        if (schema == null) {
            schema = RuntimeSchema.createFrom(cls);
            if (schema != null) {
                cachedSchema.put(cls, schema);
            }
        }
        return schema;
    }

    @SuppressWarnings("unchecked")
    public static <T> String serializeToString(T obj) {
        Class<T> cls = (Class<T>) obj.getClass();
        LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
        try {
            Schema<T> schema = getSchema(cls);
            return new String(ProtobufIOUtil.toByteArray(obj, schema, buffer), "ISO8859-1");
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        } finally {
            buffer.clear();
        }
    }

    public static <T> T deserializeFromString(String data, Class<T> cls) {
        try {
            T message = (T) objenesis.newInstance(cls);
            Schema<T> schema = getSchema(cls);
            ProtobufIOUtil.mergeFrom(data.getBytes("ISO8859-1"), message, schema);
            return message;
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }
    

    @SuppressWarnings("unchecked")
    public static <T> byte[] serializeToByte(T obj) {
        Class<T> cls = (Class<T>) obj.getClass();
        LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
        try {
            Schema<T> schema = getSchema(cls);
            return ProtobufIOUtil.toByteArray(obj, schema, buffer);
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        } finally {
            buffer.clear();
        }
    }

    public static <T> T deserializeFromByte(byte[] data, Class<T> cls) {
        try {
            T message = (T) objenesis.newInstance(cls);
            Schema<T> schema = getSchema(cls);
            ProtobufIOUtil.mergeFrom(data, message, schema);
            return message;
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }
}