主要是对集合的序列化和反序列化，可能不是最优方法，希望有更好实现的同学能告知一下。直接贴代码：
<dependency>
<groupId>com.dyuproject.protostuff</groupId>
<artifactId>protostuff-core</artifactId>
<version>1.1.3</version>
</dependency>
<dependency>
<groupId>com.dyuproject.protostuff</groupId>
<artifactId>protostuff-runtime</artifactId>
<version>1.1.3</version>
</dependency>
<dependency>
<groupId>com.dyuproject.protostuff</groupId>
<artifactId>protostuff-collectionschema</artifactId>
<version>1.1.3</version>
</dependency>import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.springframework.objenesis.Objenesis;
import org.springframework.objenesis.ObjenesisStd;
import com.dyuproject.protostuff.LinkedBuffer;
import com.dyuproject.protostuff.ProtostuffIOUtil;
import com.dyuproject.protostuff.Schema;
import com.dyuproject.protostuff.StringMapSchema;
import com.dyuproject.protostuff.runtime.RuntimeSchema;
public class ProtostuffUtil {
private static Map<Class<?>, Schema<?>> cachedSchema = new ConcurrentHashMap<Class<?>, Schema<?>>();
private static Map<Class<?>, StringMapSchema<?>> mapSchema = new ConcurrentHashMap<Class<?>, StringMapSchema<?>>();
private static Objenesis objenesis = new ObjenesisStd(true);
/**
* 缓存Schema对象
*
* @param clazz
* @return
*/
@SuppressWarnings("unchecked")
private static <T> Schema<T> getSchema(Class<T> clazz) {
Schema<T> schema = (Schema<T>) cachedSchema.get(clazz);
if (schema == null) {
schema = RuntimeSchema.getSchema(clazz);
if (schema != null) {
cachedSchema.put(clazz, schema);
}
}
return schema;
}
/**
* 缓存StringMapSchema
*
* @param clazz
* @return
*/
@SuppressWarnings("unchecked")
private static <T> StringMapSchema<T> getMapSchema(Class<T> clazz) {
StringMapSchema<T> schema = (StringMapSchema<T>) mapSchema.get(clazz);
if (schema == null) {
schema = new StringMapSchema<>(getSchema(clazz));
if (schema != null) {
mapSchema.put(clazz, schema);
}
}
return schema;
}
/**
* 序列化对象
*
* @param obj
* @return
*/
@SuppressWarnings("unchecked")
public static <T> byte[] serialize(T obj) {
if (obj == null) {
throw new IllegalArgumentException("不能序列化空对象!");
}
Schema<T> schema = getSchema((Class<T>) obj.getClass());
LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
byte[] protostuff = null;
try {
protostuff = ProtostuffIOUtil.toByteArray(obj, schema, buffer);
} catch (Exception e) {
throw new RuntimeException("序列化(" + obj.getClass().getName() + ")对象时发生异常!", e);
} finally {
buffer.clear();
}
return protostuff;
}
/**
* 反序列化
*
* @param dataByte
* @param clazz
* @return
*/
public static <T> T deserialize(byte[] dataByte, Class<T> clazz) {
if (dataByte == null || dataByte.length == 0) {
throw new RuntimeException("反序列化对象发生异常,byte序列为空!");
}
T instance = objenesis.newInstance(clazz);
Schema<T> schema = getSchema(clazz);
ProtostuffIOUtil.mergeFrom(dataByte, instance, schema);
return instance;
}
/**
* 序列化list<br>
* <p>
* <strong>此方法T != Object，因为如果是List<Object>则反序列化时会抛出异常</strong>
* </p>
*
* @param list
* @return
*/
@SuppressWarnings("unchecked")
public static <T> byte[] serializeListNotObjectClass(List<T> list) {
if (list == null || list.isEmpty()) {
throw new IllegalArgumentException("不能序列化空列表!");
}
Schema<T> schema = getSchema((Class<T>) list.get(0).getClass());
LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
byte[] protostuff = null;
ByteArrayOutputStream bos = null;
try {
bos = new ByteArrayOutputStream();
ProtostuffIOUtil.writeListTo(bos, list, schema, buffer);
protostuff = bos.toByteArray();
} catch (Exception e) {
throw new RuntimeException("序列化对象列表时发生异常!", e);
} finally {
buffer.clear();
try {
if (bos != null) {
bos.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return protostuff;
}
/**
* 反序列化list
* <p>
* <strong>此方法T != Object，否则会抛出异常</strong>
* </p>
*
* @param dataByte
* @param clazz
* @return
*/
public static <T> List<T> deserializeListNotObjectClass(byte[] dataByte, Class<T> clazz) {
if (dataByte == null || dataByte.length == 0) {
throw new RuntimeException("反序列化对象发生异常,byte序列为空!");
}
Schema<T> schema = getSchema(clazz);
List<T> result = null;
try {
result = ProtostuffIOUtil.parseListFrom(new ByteArrayInputStream(dataByte), schema);
} catch (IOException e) {
throw new RuntimeException("反序列化对象列表发生异常!", e);
}
return result;
}
/**
* 序列化List集合，如果T==Object，则放到ListDto再序列化ListDto对象
*
* @param list
* @param clazz
* @return
*/
public static <T> byte[] serializeList(List<T> list, Class<T> clazz) {
if (list == null || list.isEmpty()) {
throw new IllegalArgumentException("不能序列化空列表!");
}
if (Object.class == clazz) {
ListDto listDto = new ListDto();
listDto.setList(list);
return serialize(listDto);
} else {
return serializeListNotObjectClass(list);
}
}
/**
* 反序列化List集合，如果T==Object，则反序列化为ListDto对象再取list
*
* @param dataByte
* @param clazz
* @return
*/
@SuppressWarnings("unchecked")
public static <T> List<T> deserializeList(byte[] dataByte, Class<T> clazz) {
if (dataByte == null || dataByte.length == 0) {
throw new RuntimeException("反序列化对象发生异常,byte序列为空!");
}
if (Object.class == clazz) {
return (List<T>) deserialize(dataByte, ListDto.class).getList();
}
return deserializeListNotObjectClass(dataByte, clazz);
}
/**
* 序列化Map对象，V不应为Object
*
* @param map
* @return
*/
@SuppressWarnings("unchecked")
public static <V> byte[] serializeMapNotObjectClassValue(Map<String, V> map) {
if (map == null) {
throw new IllegalArgumentException("不能序列化空对象!");
}
StringMapSchema<V> schema = getMapSchema((Class<V>) map.values().iterator().next().getClass());
LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
byte[] protostuff = null;
try {
protostuff = ProtostuffIOUtil.toByteArray(map, schema, buffer);
} catch (Exception e) {
throw new RuntimeException("序列化map对象时发生异常!", e);
} finally {
buffer.clear();
}
return protostuff;
}
/**
* 反序列化Map集合，clazz不应为Object
*
* @param dataByte
* @param clazz
* @return
*/
public static <V> Map<String, V> deserializeMapNotObjectClassValue(byte[] dataByte, Class<V> clazz) {
if (dataByte == null || dataByte.length == 0) {
throw new RuntimeException("反序列化对象发生异常,byte序列为空!");
}
if (Object.class == clazz) {
throw new IllegalArgumentException("不能反序列化成Map<String, Object>对象!");
}
Map<String, V> instance = new HashMap<String, V>();
StringMapSchema<V> schema = getMapSchema(clazz);
ProtostuffIOUtil.mergeFrom(dataByte, instance, schema);
return instance;
}
/**
* 序列化Map集合
*
* @param map
* @param clazz
* @return
*/
public static <V> byte[] serializeMap(Map<String, V> map, Class<V> clazz) {
if (map == null) {
throw new IllegalArgumentException("不能序列化空对象!");
}
if (clazz == Object.class) {
MapDto mapDto = new MapDto();
mapDto.setMap(map);
return serialize(mapDto);
} else {
return serializeMapNotObjectClassValue(map);
}
}
/**
* 反序列化Map集合
*
* @param dataByte
* @param clazz
* @return
*/
@SuppressWarnings("unchecked")
public static <V> Map<String, V> deserializeMap(byte[] dataByte, Class<V> clazz) {
if (dataByte == null || dataByte.length == 0) {
throw new RuntimeException("反序列化对象发生异常,byte序列为空!");
}
if (Object.class == clazz) {
return (Map<String, V>) deserialize(dataByte, MapDto.class).getMap();
} else {
return deserializeMapNotObjectClassValue(dataByte, clazz);
}
}
private static class MapDto {
private Map<String, ? extends Object> map;
public Map<String, ? extends Object> getMap() {
return map;
}
public void setMap(Map<String, ? extends Object> map) {
this.map = map;
}
}
private static class ListDto {
private List<? extends Object> list;
public List<? extends Object> getList() {
return list;
}
public void setList(List<? extends Object> list) {
this.list = list;
}
}
}