protostuff简单应用

　　protobuf是谷歌推出的与语言无关、平台无关的通信协议，一个对象经过protobuf序列化后将变成二进制格式的数据，所以他可读性差，但换来的是占用空间小，速度快。居网友测试，它的序列化效率是xml的10倍以上。protostuff是java的实现版本。

　　protostuff在项目中的使用：

maven依赖：

<dependency>
      <groupId>io.protostuff</groupId>
      <artifactId>protostuff-api</artifactId>
      <version>1.5.1</version>
      <scope>compile</scope>
      <exclusions>
        <exclusion>
          <artifactId>commons-logging</artifactId>
          <groupId>commons-logging</groupId>
        </exclusion>
        <exclusion>
          <artifactId>log4j</artifactId>
          <groupId>log4j</groupId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>io.protostuff</groupId>
      <artifactId>protostuff-collectionschema</artifactId>
      <version>1.5.1</version>
      <scope>compile</scope>
      <exclusions>
        <exclusion>
          <artifactId>commons-logging</artifactId>
          <groupId>commons-logging</groupId>
        </exclusion>
        <exclusion>
          <artifactId>log4j</artifactId>
          <groupId>log4j</groupId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>io.protostuff</groupId>
      <artifactId>protostuff-runtime</artifactId>
      <version>1.5.1</version>
      <scope>compile</scope>
      <exclusions>
        <exclusion>
          <artifactId>commons-logging</artifactId>
          <groupId>commons-logging</groupId>
        </exclusion>
        <exclusion>
          <artifactId>log4j</artifactId>
          <groupId>log4j</groupId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>io.protostuff</groupId>
      <artifactId>protostuff-core</artifactId>
      <version>1.3.5</version>
      <scope>compile</scope>
      <exclusions>
        <exclusion>
          <artifactId>commons-logging</artifactId>
          <groupId>commons-logging</groupId>
        </exclusion>
        <exclusion>
          <artifactId>log4j</artifactId>
          <groupId>log4j</groupId>
        </exclusion>
      </exclusions>
    </dependency>

工具类：

public class ProtostuffUtil {

    private static Map<Class<?>, Schema<?>> cachedSchema = new ConcurrentHashMap<Class<?>, Schema<?>>();

    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;
    }

    /**
     * 序列化
     *
     * @param obj 序列化对象
     * @return 序列化后的byte[]值
     */
    public static <T> byte[] serializer(T obj) {
        @SuppressWarnings("unchecked")
        Class<T> clazz = (Class<T>) obj.getClass();
        LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
        try {
            Schema<T> schema = getSchema(clazz);
            return ProtostuffIOUtil.toByteArray(obj, schema, buffer);
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        } finally {
            buffer.clear();
        }
    }

    /**
     * 反序列化
     *
     * @param data 序列化后的byte[]值
     * @param clazz 反序列化后的对象
     * @return 返回的对象
     */
    public static <T> T deserializer(byte[] data, Class<T> clazz) {
        try {
            T obj = clazz.newInstance();
            Schema<T> schema = getSchema(clazz);
            ProtostuffIOUtil.mergeFrom(data, obj, schema);
            return obj;
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }

}