检查tomcat9客户端连接是否活跃？

Question

假设我们有一个名为 Client 的 Spring Web 应用程序和另一个名为 Server 的 Spring Web 应用程序，两者都部署在 tomcat9 上，客户端正在向服务器发出请求，服务器现在正在处理请求，在客户端关闭连接之间，我想要要取消进程中的请求，有什么方法可以从 httpservletRequest 获取客户端连接并检查 conn 是否仍然存在并且可以以某种方式杀死处理线程？

Answer 1

要处理客户端断开连接时中断线程处理请求的情况，可以利用 java 和 spring 的组合功能。

1. 在春季启用

   @EnableAsync

确保您的Web应用程序支持异步请求处理，您可以通过注释启用它

@EnableAsync

2. 在Servlet中使用

AsyncContext

这是供参考的代码片段；

import javax.servlet.AsyncContext;
import javax.servlet.AsyncEvent;
import javax.servlet.AsyncListener;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

@Controller
public class MyController {

    private ExecutorService executorService = Executors.newFixedThreadPool(10);

    @RequestMapping("/process")
    public void processRequest(HttpServletRequest request, HttpServletResponse response) {
        final AsyncContext asyncContext = request.startAsync();
        asyncContext.setTimeout(60000);

        Future<?> future = executorService.submit(() -> {
            try {
                // Long running process
                for (int i = 0; i < 100; i++) {
                    if (Thread.currentThread().isInterrupted()) {
                        // Clean up and exit if interrupted
                        return;
                    }
                    // Simulate work
                    Thread.sleep(100);
                }
                asyncContext.getResponse().getWriter().write("Processing Complete");
            } catch (IOException | InterruptedException e) {
                // Handle exception
                Thread.currentThread().interrupt();
            } finally {
                asyncContext.complete();
            }
        });

        asyncContext.addListener(new AsyncListener() {
            @Override
            public void onComplete(AsyncEvent asyncEvent) throws IOException {
                // Clean up
            }

            @Override
            public void onTimeout(AsyncEvent asyncEvent) throws IOException {
                // Handle timeout
                future.cancel(true);
            }

            @Override
            public void onError(AsyncEvent asyncEvent) throws IOException {
                // Handle error
                future.cancel(true);
            }

            @Override
            public void onStartAsync(AsyncEvent asyncEvent) throws IOException {
                // Handle start async
            }
        });

        request.getAsyncContext().addListener(new AsyncListener() {
            @Override
            public void onComplete(AsyncEvent asyncEvent) throws IOException {
                // No additional actions needed here
            }

            @Override
            public void onTimeout(AsyncEvent asyncEvent) throws IOException {
                future.cancel(true);
            }

            @Override
            public void onError(AsyncEvent asyncEvent) throws IOException {
                future.cancel(true);
            }

            @Override
            public void onStartAsync(AsyncEvent asyncEvent) throws IOException {
                // No additional actions needed here
            }
        });
    }
}