MessagePack: MessagePack入门

http://blog.csdn.net/sunning9001/article/details/50420290

MessagePack介绍：

MessagePack is an efficient binary serialization format.It lets you exchange data among multiple languages like JSON. But it's faster and smaller.
Small integers are encoded into a single byte, and typical short strings require only one extra byte in addition to the strings themselves.

支持语言：

MessagePack is supported by over 50 programming languages and environments.

Smalltalk        ActionScript3    PHP              Lua              Rust             Elixir           Scheme           C++11            Go               mruby            Elixir           Rails            Python           Julia            Clojure          Clojure          SML              C                Dart             HHVM             F#               Jackson-dataformaSwift            Objective-C      Node             Haskell          Pascal           Delphi           Qt               Go               Shell            C#               Elixir           Scala            Python/Twisted   J                Swift            Nim              C                Rust             Nim              Crystal          JavaScript       UNIX             PHP              Swift            C#               

1-使用@Message 可以标记被序列化的类。类中所有成员都会被序列化。

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1. @Message  
2. public class SerializeObject  
3. {  
4.     private int i;  
5.     private String str;  
6.     public short s;  
7.     public long l;  
8.     public SerializeObject(int i, String str, short s, long l) {  
9.         super();  
10.         this.i = i;  
11.         this.str = str;  
12.         this.s = s;  
13.         this.l = l;  
14.     }  
15. }  

@Messagepublic class SerializeObject{private int i;private String str;public short s;public long l;public SerializeObject(int i, String str, short s, long l) {super();this.i = i;this.str = str;this.s = s;this.l = l;}}

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1. MessagePack msgpack = new MessagePack();  
2. SerializeObject src = new SerializeObject(1, "str", (short) 2, 3);  
3. // Serialize  
4. byte[] bytes = msgpack.write(src);  
5.   
6. // Deserialize  
7. SerializeObject dst = msgpack.read(bytes, SerializeObject.class);  
8. System.out.println(dst.toString());  

MessagePack msgpack = new MessagePack();SerializeObject src = new SerializeObject(1, "str", (short) 2, 3);// Serializebyte[] bytes = msgpack.write(src);// DeserializeSerializeObject dst = msgpack.read(bytes, SerializeObject.class);System.out.println(dst.toString());

2 -使用@optional 注解可以用于版本升级

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1. @Message  
2. public class NewSerializeObject extends SerializeObject {  
3.     @Optional  
4.     private String nstr = "";  
5.   
6.     public String getNstr() {  
7.         return nstr;  
8.     }  
9.   
10.     public void setNstr(String nstr) {  
11.         this.nstr = nstr;  
12.     }  
13.   
14.     @Override  
15.     public String toString() {  
16.         return "NewSerializeObject [nstr=" + nstr + "]";  
17.     }  
18. }  

@Messagepublic class NewSerializeObject extends SerializeObject {@Optionalprivate String nstr = "";public String getNstr() {return nstr;}public void setNstr(String nstr) {this.nstr = nstr;}@Overridepublic String toString() {return "NewSerializeObject [nstr=" + nstr + "]";}}

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1. MessagePack msgpack = new MessagePack();  
2. SerializeObject src = new SerializeObject(1, "str", (short) 2, 3);  
3. // Serialize  
4. byte[] bytes = msgpack.write(src);  
5.   
6. // Deserialize  
7. SerializeObject dst = msgpack.read(bytes, SerializeObject.class);  
8. System.out.println(dst.toString());  
9. //使用@optional注解,来升级序列化对象  
10. NewSerializeObject newDst = msgpack.read(bytes, NewSerializeObject.class);  
11. System.out.println(newDst.toString());  

MessagePack msgpack = new MessagePack();SerializeObject src = new SerializeObject(1, "str", (short) 2, 3);// Serializebyte[] bytes = msgpack.write(src);// DeserializeSerializeObject dst = msgpack.read(bytes, SerializeObject.class);System.out.println(dst.toString());//使用@optional注解,来升级序列化对象NewSerializeObject newDst = msgpack.read(bytes, NewSerializeObject.class);System.out.println(newDst.toString());

3- 序列化list数组

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1.   MessagePack msgpack = new MessagePack();  
2.   
3.    // Create templates for serializing/deserializing List and Map objects  
4. //使用template来序列化List数组。  
5.    Template<List<String>> listTmpl = Templates.tList(Templates.TString);  
6.   
7.   
8.    //  
9.    // Serialization  
10.    //  
11.   
12.    ByteArrayOutputStream out = new ByteArrayOutputStream();  
13.    Packer packer = msgpack.createPacker(out);  
14.   
15.    // Serialize List object  
16.    List<String> list = new ArrayList<String>();  
17.    list.add("msgpack");  
18.    list.add("for");  
19.    list.add("java");  
20.    packer.write(list); // List object  
21.   
22.    //  
23.    // Deserialization  
24.    //  
25.    byte[] bytes = out.toByteArray();  
26.    ByteArrayInputStream in = new ByteArrayInputStream(bytes);  
27.    Unpacker unpacker = msgpack.createUnpacker(in);  
28.    // to List object  
29.    List<String> dstList = unpacker.read(listTmpl);  
30.           System.out.println(dstList);  

       MessagePack msgpack = new MessagePack();        // Create templates for serializing/deserializing List and Map objects    //使用template来序列化List数组。        Template<List<String>> listTmpl = Templates.tList(Templates.TString);        //        // Serialization        //        ByteArrayOutputStream out = new ByteArrayOutputStream();        Packer packer = msgpack.createPacker(out);        // Serialize List object        List<String> list = new ArrayList<String>();        list.add("msgpack");        list.add("for");        list.add("java");        packer.write(list); // List object        //        // Deserialization        //        byte[] bytes = out.toByteArray();        ByteArrayInputStream in = new ByteArrayInputStream(bytes);        Unpacker unpacker = msgpack.createUnpacker(in);        // to List object        List<String> dstList = unpacker.read(listTmpl);                System.out.println(dstList);    

4- 序列化map对象

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1. MessagePack msgpack = new MessagePack();  
2.   
3.     // Create templates for serializing/deserializing List and Map objects  
4.  //使用template来序列化map对象  
5. Template<Map<String, String>> mapTmpl = Templates.tMap(Templates.tString(), Templates.tString());  
6.   
7.   
8.     //  
9.     // Serialization  
10.     //  
11.   
12.     ByteArrayOutputStream out = new ByteArrayOutputStream();  
13.     Packer packer = msgpack.createPacker(out);  
14.   
15.     // Serialize Map object  
16.     Map<String, String> map = new HashMap<String, String>();  
17.     map.put("sadayuki", "furuhashi");  
18.     map.put("muga", "nishizawa");  
19.     packer.write(map); // Map object  
20.   
21.     //  
22.     // Deserialization  
23.     //  
24.     byte[] bytes = out.toByteArray();  
25.     ByteArrayInputStream in = new ByteArrayInputStream(bytes);  
26.     Unpacker unpacker = msgpack.createUnpacker(in);  
27.     // to List object  
28.     // to Map object  
29.     Map<String, String> dstMap = unpacker.read(mapTmpl);  
30.     System.out.println(dstMap);  

   MessagePack msgpack = new MessagePack();        // Create templates for serializing/deserializing List and Map objects    //使用template来序列化map对象   Template<Map<String, String>> mapTmpl = Templates.tMap(Templates.tString(), Templates.tString());        //        // Serialization        //        ByteArrayOutputStream out = new ByteArrayOutputStream();        Packer packer = msgpack.createPacker(out);        // Serialize Map object        Map<String, String> map = new HashMap<String, String>();        map.put("sadayuki", "furuhashi");        map.put("muga", "nishizawa");        packer.write(map); // Map object        //        // Deserialization        //        byte[] bytes = out.toByteArray();        ByteArrayInputStream in = new ByteArrayInputStream(bytes);        Unpacker unpacker = msgpack.createUnpacker(in);        // to List object        // to Map object        Map<String, String> dstMap = unpacker.read(mapTmpl);        System.out.println(dstMap);

5 -MessagePack 不支持对Object对象的序列化,但是jackson-dataformat-msgpack 提供对messagepack格式的序列化和反序列化。

This Jackson extension library handles reading and writing of data encoded in MessagePack data format.

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1. public class ExamplePojo {  
2.     private String name;  
3.     public ExamplePojo(String name) {  
4.         super();  
5.         this.name = name;  
6.     }  
7.     public String getName() {  
8.         return name;  
9.     }  
10.     public void setName(String name) {  
11.         this.name = name;  
12.     }  
13.     public ExamplePojo() {  
14.     }  
15. }  

public class ExamplePojo {private String name;public ExamplePojo(String name) {super();this.name = name;}public String getName() {return name;}public void setName(String name) {this.name = name;}public ExamplePojo() {}}

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1.               ObjectMapper objectMapper = new ObjectMapper(new MessagePackFactory());  
2. ExamplePojo orig = new ExamplePojo("komamitsu");  
3. byte[] bytes = objectMapper.writeValueAsBytes(orig);  
4.   
5.   
6. ExamplePojo value = objectMapper.readValue(bytes, ExamplePojo.class);  
7. System.out.println(value.getName()); // => komamitsu  

                ObjectMapper objectMapper = new ObjectMapper(new MessagePackFactory());ExamplePojo orig = new ExamplePojo("komamitsu");byte[] bytes = objectMapper.writeValueAsBytes(orig);ExamplePojo value = objectMapper.readValue(bytes, ExamplePojo.class);System.out.println(value.getName()); // => komamitsu

这让人情何以堪,MessagePack 支持力度果然不行啊。