序列化和反序列化

• Maven:Pom.xml

 <dependencies> <dependency> <groupId>org.apache.avro</groupId> <artifactId>avro</artifactId> <version>1.8.2</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.avro</groupId> <artifactId>avro-maven-plugin</artifactId> <version>1.8.1</version> <executions> <execution> <phase>generate-sources</phase> <goals> <goal>schema</goal> </goals> <configuration> <sourceDirectory>${project.basedir}/src/main/avro/</sourceDirectory> <outputDirectory>${project.basedir}/src/main/java/</outputDirectory> </configuration> </execution> </executions> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build>

• Avro:MapAvro.avsc

{ "type":"record", "namespace":"com.qidai", "name":"Employee", "doc":"Test Employee bean", "fields":[ {"name":"id","type":["null","int"]}, {"name":"name","type":["null","string"]}, {"name":"age","type":["null","int"]}, {"name":"gender","type":["null","string"]} ] }

• 添加完依赖后直接点击maven插件install即可，就会产生对应的class
• 序列化和反序列化(使用javaclass)

@Test public void ser() throws Exception { Employee employee = Employee.newBuilder().setAge(12).setGender("NAN").setId(1).setName("tom").build(); DatumWriter<Employee> employeeDatumWriter = new SpecificDatumWriter<>(Employee.class); DataFileWriter<Employee> dataFileWriter = new DataFileWriter<>(employeeDatumWriter); dataFileWriter.create(employee.getSchema(), new File("emp.avro")); dataFileWriter.append(employee); dataFileWriter.close(); } @Test public void deSer() throws Exception { DatumReader<Employee> employeeDatumReader = new SpecificDatumReader<>(Employee.class); DataFileReader<Employee> dataFileReader = new DataFileReader<>(new File("emp.avro"), employeeDatumReader); Employee employee = null; while (dataFileReader.hasNext()) { employee = dataFileReader.next(); System.out.println(employee); } }

• 序列化反序列化(直接使用avro文件)

@Test public void ser() throws Exception { Schema schema = new Schema.Parser().parse(new File("emp.avsc")); GenericRecord empRecord1 = new GenericData.Record(schema); empRecord1.put("id", 1); empRecord1.put("name", "Ben"); empRecord1.put("age", 7); empRecord1.put("gender", "nv"); File file = new File("empser.avro"); DatumWriter<GenericRecord> datumWriter = new GenericDatumWriter<>(schema); DataFileWriter<GenericRecord> dataFileWriter = new DataFileWriter<>(datumWriter); dataFileWriter.create(schema, file); dataFileWriter.append(empRecord1); dataFileWriter.close(); } @Test public void deSer() throws Exception { //指定avro格式文件 Schema schema = new Schema.Parser().parse(new File("emp.avsc")); //指定序列化好的数据文件 File file = new File("empser.avro"); DatumReader<GenericRecord> datumReader = new GenericDatumReader<>(schema); DataFileReader<GenericRecord> dataFileReader = new DataFileReader<>(file, datumReader); GenericRecord emp = null; while (dataFileReader.hasNext()) { emp = dataFileReader.next(); System.out.println(emp); } }

RPC实现

• 编写avsc文件：user.avsc，作为要发送的实体类

{ "namespace":"com.qidai.bean", "name":"User", "doc":"test rpc class", "type":"record", "fields":[ {"name":"name","type":["string","null"]}, {"name":"age","type":["int","null"]}, {"name":"date","type":["string","null"]} ] }

• 编写协议文件:protomes.avdl

@namespace("com.qidai.proto") protocol UserProtocol{ import schema "user.avsc"; string sendMes(com.qidai.bean.User user); //对应协议中的方法 }

• 编写完毕之后检查maven pom文件

<dependencies> <dependency> <groupId>org.apache.avro</groupId> <artifactId>avro</artifactId> <version>1.8.2</version> </dependency> <dependency> <groupId>org.apache.avro</groupId> <artifactId>avro-ipc</artifactId> <version>1.8.2</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.avro</groupId> <artifactId>avro-maven-plugin</artifactId> <version>1.8.1</version> <executions> <execution> <phase>generate-sources</phase> <goals> <goal>schema</goal> <goal>idl-protocol</goal> </goals> <configuration> <sourceDirectory>${project.basedir}/src/main/avro/</sourceDirectory> <outputDirectory>${project.basedir}/src/main/java/</outputDirectory> </configuration> </execution> </executions> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build>

• 检查没错之后，直接插件install生成avro类
• 生成之后会看到一个User的传输类，还有一个proto包下的协议接口
• 实现协议接口，重写自己的逻辑：server

public class UserProtocolImpl implements UserProtocol { @Override public CharSequence sendMes(User user) throws AvroRemoteException { System.out.println("Server --> 接收" + user.toString()); return "Client sendMes " + user.toString(); } }

• 实现协议接口，重写自己的逻辑：client

public class UserProtocolImpl implements UserProtocol { @Override public CharSequence sendMes(User user) throws AvroRemoteException { System.out.println("Client --> 发送" + user.toString()); return "Client sendMes " + user.toString(); } }

• 编写serverApp

public class ServerApp { public static void main(String[] args) throws IOException, InterruptedException { Responder responder = new SpecificResponder(UserProtocol.class,new UserProtocolImpl()); SaslSocketServer server = new SaslSocketServer(responder,new InetSocketAddress(9999)); server.start(); Thread.sleep(5000000); } }

• 编写clientApp

public class ClientApp { public static void main(String[] args) throws IOException { SaslSocketTransceiver transceiver = new SaslSocketTransceiver(new InetSocketAddress(9999)); UserProtocol client = SpecificRequestor.getClient(UserProtocol.class, transceiver); Scanner scanner = new Scanner(System.in); while (scanner.next() != null) { User user = new User(); user.setName("xiaofen"); System.out.println(client.sendMes(user)); } } }

• 测试：先启动serverApp，然后启动clientApp，这时候在client的console中输入任意值，会发现服务端和客户端都会输出消息

  • server

  Server --> {"name": "xiaofen", "age": null, "date": null} Server --> {"name": "xiaofen", "age": null, "date": null} Server --> {"name": "xiaofen", "age": null, "date": null} Server --> {"name": "xiaofen", "age": null, "date": null} Server --> {"name": "xiaofen", "age": null, "date": null} Server --> {"name": "xiaofen", "age": null, "date": null} Server --> {"name": "xiaofen", "age": null, "date": null}

  • client

  1 Client sendMes {"name": "xiaofen", "age": null, "date": null} 1 Client sendMes {"name": "xiaofen", "age": null, "date": null} 1 Client sendMes {"name": "xiaofen", "age": null, "date": null} 1 Client sendMes {"name": "xiaofen", "age": null, "date": null} 1 Client sendMes {"name": "xiaofen", "age": null, "date": null} 1 Client sendMes {"name": "xiaofen", "age": null, "date": null} 1 Client sendMes {"name": "xiaofen", "age": null, "date": null}

• 对于server的client的实现有如下几种
  1.基于jetty的http实现:HttpServer 和HttpTransceiver

2.基于netty的实现:NettyServer和NettyTransceiver
3.基于TCP的实现:SocketServer和SocketTransceiver
4.基于UDP的实现:DatagramServer和DatagramTransceiver
5.基于加密的TCP实现:SaslSocketServer和SaslSocketTransceiver