我正在寻找一个通过 spring boot 连接 TCP 的示例,无需 xml(spring-integration)。
我从 How to create a Tcp Connection in spring boot to accept connections? 得到了以下代码片段网址。
在这个例子中,仅仅需要main方法就足以连接tcp。为什么其他bean和变压器在这里声明?
有错吗?我不想使用简单的 Java 套接字客户端来接受响应,而是想与 Spring 集成。但没有使用 Java DSL 的合适示例。
你能帮忙吗?
package com.example;
import java.net.Socket;
import javax.net.SocketFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.annotation.Transformer;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.ip.tcp.TcpReceivingChannelAdapter;
import org.springframework.integration.ip.tcp.connection.AbstractServerConnectionFactory;
import org.springframework.integration.ip.tcp.connection.TcpNetServerConnectionFactory;
import org.springframework.integration.transformer.ObjectToStringTransformer;
import org.springframework.messaging.MessageChannel;
@SpringBootApplication
public class So39290834Application {
public static void main(String[] args) throws Exception {
ConfigurableApplicationContext context = SpringApplication.run(So39290834Application.class, args);
Socket socket = SocketFactory.getDefault().createSocket("localhost", 9999);
socket.getOutputStream().write("foo\r\n".getBytes());
socket.close();
Thread.sleep(1000);
context.close();
}
@Bean
public TcpNetServerConnectionFactory cf() {
return new TcpNetServerConnectionFactory(9999);
}
@Bean
public TcpReceivingChannelAdapter inbound(AbstractServerConnectionFactory cf) {
TcpReceivingChannelAdapter adapter = new TcpReceivingChannelAdapter();
adapter.setConnectionFactory(cf);
adapter.setOutputChannel(tcpIn());
return adapter;
}
@Bean
public MessageChannel tcpIn() {
return new DirectChannel();
}
@Transformer(inputChannel = "tcpIn", outputChannel = "serviceChannel")
@Bean
public ObjectToStringTransformer transformer() {
return new ObjectToStringTransformer();
}
@ServiceActivator(inputChannel = "serviceChannel")
public void service(String in) {
System.out.println(in);
}
}
最佳答案
该应用程序既是客户端又是服务器。
这个问题具体是关于如何使用 Spring Integration 编写服务器端(接受连接)。
main()
方法只是一个连接到服务器端的测试。它使用标准 Java 套接字 API;它也可以被编写为在客户端使用 Spring Integration 组件。
顺便说一句,您不必使用 XML 来编写 Spring Integration 应用程序,您可以使用注释对其进行配置,或者使用 Java DSL。阅读文档。
编辑
使用 Java DSL 的客户端/服务器示例
@SpringBootApplication
public class So54057281Application {
public static void main(String[] args) {
SpringApplication.run(So54057281Application.class, args);
}
@Bean
public IntegrationFlow server() {
return IntegrationFlows.from(Tcp.inboundGateway(
Tcp.netServer(1234)
.serializer(codec()) // default is CRLF
.deserializer(codec()))) // default is CRLF
.transform(Transformers.objectToString()) // byte[] -> String
.<String, String>transform(p -> p.toUpperCase())
.get();
}
@Bean
public IntegrationFlow client() {
return IntegrationFlows.from(MyGateway.class)
.handle(Tcp.outboundGateway(
Tcp.netClient("localhost", 1234)
.serializer(codec()) // default is CRLF
.deserializer(codec()))) // default is CRLF
.transform(Transformers.objectToString()) // byte[] -> String
.get();
}
@Bean
public AbstractByteArraySerializer codec() {
return TcpCodecs.lf();
}
@Bean
@DependsOn("client")
ApplicationRunner runner(MyGateway gateway) {
return args -> {
System.out.println(gateway.exchange("foo"));
System.out.println(gateway.exchange("bar"));
};
}
public interface MyGateway {
String exchange(String out);
}
}
结果
FOO
BAR
关于java - Spring Boot TCP 客户端,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54057281/