環(huán)境要求
J DK 6 或以上版本
API使用說(shuō)明
示例：假如需要定義protobuf定義一個(gè)數(shù)據(jù)接口，包含兩個(gè)屬性，一個(gè)是string，一個(gè)是int32
傳統(tǒng)protobuf使用過(guò)程
a 定義.proto說(shuō)明文件. test.proto
package pkg;
option java_package = "com.baidu.bjf.remoting.protobuf";
//這里聲明輸出的java的類名
option java_outer_classname = "SimpleTypeTest";
message InterClassName {
required string name = 1;
required int32 value = 2;
}
b 使用protoc.exe 編譯.proto文件
protoc --java_out=src test.proto
c 編譯生成的Java文件，利用protobuf API進(jìn)行序列化與反序化操作
序列化操作：
InterClassName icn = InterClassName.newBuilder().setName("abc")
.setValue(100).build();
byte[] bb = icn.toByteArray();
反序化操作
byte[] bb =
;
InterClassName icn = InterClassName.parseFrom(bb);
使用jprotobuf API 簡(jiǎn)化開(kāi)發(fā)
a 使用注解直接使用pojo對(duì)象
import com.baidu.bjf.remoting.protobuf.FieldType;
import com.baidu.bjf.remoting.protobuf.annotation.Protobuf;
/**
* A simple jprotobuf pojo class just for demo.
*
* @author xiemalin
* @since 1.0.0
*/
public class SimpleTypeTest {
@Protobuf(fieldType = FieldType.STRING, order = 1, required = true)
private String name;
@Protobuf(fieldType = FieldType.INT32, order = 2, required = false)
private int value;
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
}
b 使用jprotobuf API進(jìn)行序列化與反序列化操作
Codec<SimpleTypeTest> simpleTypeCodec = ProtobufProxy
.create(SimpleTypeTest.class);
SimpleTypeTest stt = new SimpleTypeTest();
stt.name = "abc";
stt.setValue(100);
try {
// 序列化
byte[] bb = simpleTypeCodec.encode(stt);
// 反序列化
SimpleTypeTest newStt = simpleTypeCodec.decode(bb);
} catch (IOException e) {
e.printStackTrace();
}
嵌套對(duì)象的開(kāi)發(fā)示例
public class AddressBookProtosPOJO {
@Protobuf(fieldType = FieldType.OBJECT, order=1, required =
false)
public Person person;
@Protobuf(fieldType = FieldType.OBJECT, order=2, required =
false)
public List<Person> person;
}
public class Person {
@Protobuf(fieldType = FieldType.STRING, order=1, required =
true)
public String name;
@Protobuf(fieldType = FieldType.INT32, order=2, required =
true)
public int id;
@Protobuf(fieldType = FieldType.STRING, order=3, required =
false)
public String email;
@Protobuf(fieldType = FieldType.DOUBLE, order=4, required =
false)
public Double doubleF;
@Protobuf(fieldType = FieldType.FLOAT, order=5, required =
false)
public Float floatF;
@Protobuf(fieldType = FieldType.BYTES, order=6, required =
false)
public byte[] bytesF;
@Protobuf(fieldType=FieldType.BOOL, order=7, required=
false)
public Boolean boolF;
}
由注解對(duì)象動(dòng)態(tài)生成Protobuf的IDL描述文件內(nèi)容
JProtobuf提供一個(gè)非常實(shí)用的功能，可以動(dòng)態(tài)生成Protobuf的IDL描述文件內(nèi)容
//返回的內(nèi)容即為 Protobuf的IDL描述文件
String code = ProtobufIDLGenerator.getIDL(SimpleTypeTest.class);
public class SimpleTypeTest {
@Protobuf(fieldType = FieldType.STRING, order = 1, required = true)
private String name;
@Protobuf(fieldType = FieldType.INT32, order = 2, required = false)
private int value;
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
}
增加由.proto 描述文件動(dòng)態(tài)生成Protobuf操作對(duì)象的支持
JProtobuf提供一個(gè)更簡(jiǎn)單的功能，可支持動(dòng)態(tài)Protobuf對(duì)象的生成功能，省去了注釋的使用 基本使用示例如下：
@Test
public void testDecode() throws Exception {
// 通過(guò) .proto描述文件生成動(dòng)態(tài)解析對(duì)象
String protoCotent = "package mypackage.test; " +
"option java_package = \"com.baidu.bjf.remoting.protobuf.simplestring\";" +
"option java_outer_classname = \"StringTypeClass\"; " +
"message StringMessage { " +
" required string message = 1; }" ;
IDLProxyObject object = ProtobufIDLProxy.createSingle(protoCotent);
//if .proto IDL defines multiple messages use as follow
//Map<String, IDLProxyObject> objects = ProtobufIDLProxy.create(protoCotent);
// 動(dòng)態(tài)設(shè)置字段值
object.put("message", "hello你好");
//propogation object set
//object.put("sub.field", "hello world");
// protobuf 序列化
byte[] bb = object.encode();
// protobuf 反序列化
IDLProxyObject result = object.decode(bb);
Assert.assertEquals("hello你好", result.get("message"));
//propogation object get
//result.get("sub.field")
}
聯(lián)系我們
email: rigel-opensource@baidu.com
JProtobuf官方網(wǎng)址：https://github.com/jhunters/jprotobuf
posted on 2014-09-30 11:43
x.matthew 閱讀(4919)
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