可以使用Java自带的HttpClient或者Apache的HttpClient来替代Axis TCPMonitor插件。下面给出使用Java自带的HttpClient的示例代码：

import java.io.IOException;
import java.util.Scanner;
import java.net.URI;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public class TestHttpClient {
    public static void main(String[] args) throws IOException {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            Scanner scan = new Scanner(System.in);
            String url = scan.nextLine(); //输入目标URL
            HttpGet httpGet = new HttpGet(url);
            CloseableHttpResponse response1 = httpclient.execute(httpGet);

            try {
                System.out.println(response1.getStatusLine());
                Scanner scanner = new Scanner(response1.getEntity().getContent());
                while (scanner.hasNextLine()) {
                    System.out.println(scanner.nextLine());
                }
            } finally {
                response1.close();
            }
        } finally {
            httpclient.close();
        }
    }
}

使用该代码可以发送GET请求，并且输出响应的状态码和内容。