springboot发送tcp请求

可以使用Java自带的Socket类或者第三方库Netty来发送TCP请求。以下是使用Socket类发送TCP请求的示例代码：

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class TcpClient {
    public static void main(String[] args) {
        String host = "localhost";
        int port = 8080;
        try {
            Socket socket = new Socket(host, port);
            OutputStream outputStream = socket.getOutputStream();
            String message = "Hello, TCP server!";
            outputStream.write(message.getBytes());
            outputStream.flush();
            InputStream inputStream = socket.getInputStream();
            byte[] buffer = new byte[1024];
            int len = inputStream.read(buffer);
            String response = new String(buffer, 0, len);
            System.out.println("Server response: " + response);
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

在Spring Boot中，可以将TCP请求封装为一个服务或者组件，然后在需要的地方注入调用。例如：

import org.springframework.stereotype.Component;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

@Component
public class TcpClient {
    private final String host = "localhost";
    private final int port = 8080;

    public String send(String message) {
        try {
            Socket socket = new Socket(host, port);
            OutputStream outputStream = socket.getOutputStream();
            outputStream.write(message.getBytes());
            outputStream.flush();
            InputStream inputStream = socket.getInputStream();
            byte[] buffer = new byte[1024];
            int len = inputStream.read(buffer);
            String response = new String(buffer, 0, len);
            socket.close();
            return response;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

然后在需要发送TCP请求的地方，可以通过注入TcpClient服务来发送请求：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class MyController {
    @Autowired
    private TcpClient tcpClient;

    @GetMapping("/tcp")
    public String sendTcpRequest() {
        String message = "Hello, TCP server!";
        String response = tcpClient.send(message);
        return "Server response: " + response;
    }
}

当访问 /tcp 接口时，会发送 TCP 请求并返回响应结果。