一直在物色比较好用的网络传输数据序列化工具，看了诸如marshalling，protobuff等，但是均有一个共同特点，使用起来异常繁杂，有没有比较好用同时性能又不会太差的组件呢？答案当然是有的，那就是基于protobuff改造的protostuff，它拥有良好性能的同时，又免去了生成描述文件的烦恼，可谓是趁手利器。
来看看具体的使用方式吧。
首先，引入maven依赖如下：
<dependency>
<groupId>io.protostuff</groupId>
<artifactId>protostuff-core</artifactId>
<version>1.4.4</version>
</dependency>
<dependency>
<groupId>io.protostuff</groupId>
<artifactId>protostuff-runtime</artifactId>
<version>1.4.4</version>
</dependency>
之后，编写序列化工具Util：
public class SerializeUtil {
private static class SerializeData{
private Object target;
}
@SuppressWarnings("unchecked")
public static byte[] serialize(Object object) {
SerializeData serializeData = new SerializeData();
serializeData.target = object;
Class<SerializeData> serializeDataClass = (Class<SerializeData>) serializeData.getClass();
LinkedBuffer linkedBuffer = LinkedBuffer.allocate(1024 * 4);
try {
Schema<SerializeData> schema = RuntimeSchema.getSchema(serializeDataClass);
return ProtostuffIOUtil.toByteArray(serializeData, schema, linkedBuffer);
} catch (Exception e) {
throw new IllegalStateException(e.getMessage(), e);
} finally {
linkedBuffer.clear();
}
}
@SuppressWarnings("unchecked")
public static <T> T deserialize(byte[] data, Class<T> clazz) {
try {
Schema<SerializeData> schema = RuntimeSchema.getSchema(SerializeData.class);
SerializeData serializeData = schema.newMessage();
ProtostuffIOUtil.mergeFrom(data, serializeData, schema);
return (T) serializeData.target;
} catch (Exception e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
}
需要注意的是RuntimeSchema.getSchema这块代码，通过翻看源码可以知道，里面已经放置了一个缓存map帮我们缓存生成的内容，所以不需要自己再加缓存了。
由于protostuff目前不支持序列化list等对象，所以需要使用普通的POJO包装一下。
最后，来写一个测试吧：
public static void main(String...args) throws Exception {
User user = new User();
user.setUserId(123456);
user.setAddress("I am a good boy");
user.setNote("this is test");
List<String> list = new ArrayList<>();
list.add("record1");
list.add("record2");
list.add("record3");
user.setRecords(list);
Teacher teacher1 = new Teacher();
teacher1.setName("语文老师");
Teacher teacher2 = new Teacher();
teacher2.setName("数学老师");
List<Teacher> teachers = new ArrayList<>();
teachers.add(teacher1);
teachers.add(teacher2);
user.setTeachers(teachers);
byte[] b = serialize(user);
User rst = deserialize(b, User.class);
System.out.println(JSON.toJSONString(rst));
}
class User {
private Integer userId;
private String address;
private String note;
private List<String> records;
private List<Teacher> teachers;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getNote() {
return note;
}
public void setNote(String note) {
this.note = note;
}
public List<String> getRecords() {
return records;
}
public void setRecords(List<String> records) {
this.records = records;
}
public List<Teacher> getTeachers() {
return teachers;
}
public void setTeachers(List<Teacher> teachers) {
this.teachers = teachers;
}
}
class Teacher{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
最终的运行结果如下：
{"address":"I am a good boy","note":"this is test","records":["record1","record2","record3"],"teachers":[{"name":"语文老师"},{"name":"数学老师"}],"userId":123456}
可以看到，这种相对来说比较复杂的结构的序列化和反序列化，还是挺得心应手的。
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