protostuff序列化工具的使用

红太狼 2022-06-09 01:37 173阅读 0赞

## 引入jar包 ##

<dependency>
                <groupId>com.dyuproject.protostuff</groupId>
                <artifactId>protostuff-api</artifactId>
                <version>1.0.10</version>
            </dependency>
            <dependency>
                <groupId>com.dyuproject.protostuff</groupId>
                <artifactId>protostuff-core</artifactId>
                <version>1.0.10</version>
            </dependency>
            <dependency>
                <groupId>com.dyuproject.protostuff</groupId>
                <artifactId>protostuff-runtime</artifactId>
                <version>1.0.10</version>
            </dependency>

## 需要序列化的类 ##

package demo.protostuff;
    
    import java.util.List;
    
    /**
     * Created by yuyufeng on 2017/8/24.
     */
    public class User
    {
    
        private String firstName;
        private String lastName;
        private String email;
        private List<User> friends;
    
        public User()
        {
    
        }
    
        public User(String email)
        {
            this.email = email;
        }
    
        // getters and setters
    
        public String getFirstName() {
            return firstName;
        }
    
        public void setFirstName(String firstName) {
            this.firstName = firstName;
        }
    
        public String getLastName() {
            return lastName;
        }
    
        public void setLastName(String lastName) {
            this.lastName = lastName;
        }
    
        public String getEmail() {
            return email;
        }
    
        public void setEmail(String email) {
            this.email = email;
        }
    
        public List<User> getFriends() {
            return friends;
        }
    
        public void setFriends(List<User> friends) {
            this.friends = friends;
        }
    
        @Override
        public String toString() {
            return "User{" +
                    "firstName='" + firstName + '\'' +
                    ", lastName='" + lastName + '\'' +
                    ", email='" + email + '\'' +
                    ", friends=" + friends +
                    '}';
        }
    }

## 开始使用 ##

package demo.protostuff;
    
    import com.dyuproject.protostuff.LinkedBuffer;
    import com.dyuproject.protostuff.ProtostuffIOUtil;
    import com.dyuproject.protostuff.runtime.RuntimeSchema;
    
    import java.util.ArrayList;
    import java.util.List;
    
    /**
     * Created by yuyufeng on 2017/8/24.
     */
    public class Main {
        private static RuntimeSchema<User> schema = RuntimeSchema.createFrom(User.class);
        public static void main(String[] args) {
            User user1 = new User();
            user1.setEmail("4165@qq.com");
            user1.setFirstName("yu");
            user1.setLastName("yufeng");
            List<User> users = new ArrayList<>();
            users.add(new User("6514@qq.com"));
            user1.setFriends(users);
    
            byte[] bytes = ProtostuffIOUtil.toByteArray(user1,schema, LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE));
    
    
            User user2 = schema.newMessage();
            ProtostuffIOUtil.mergeFrom(bytes,user2,schema);
            System.out.println(user2);
    
        }
    }

## 工具类的提取 ##

package demo.protostuff;
    
    /** * Created by yuyufeng on 2017/8/24. */
    import java.util.Map;
    import java.util.concurrent.ConcurrentHashMap;
    
    import com.dyuproject.protostuff.LinkedBuffer;
    import com.dyuproject.protostuff.ProtostuffIOUtil;
    import com.dyuproject.protostuff.Schema;
    import com.dyuproject.protostuff.runtime.RuntimeSchema;
    
    public class ProtostuffUtil { 
    
        private static Map<Class<?>, Schema<?>> cachedSchema = new ConcurrentHashMap<Class<?>, Schema<?>>();
    
        private static <T> Schema<T> getSchema(Class<T> clazz) {
            @SuppressWarnings("unchecked")
            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 * @return */
        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 * @param clazz * @return */
        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);
            }
        }
    
    }