1. Let's start with an example.

   Client:

   	package top.quartz.util;
   
   	/**
   	 * description:  //connect timeout Setting up connection timeout time;
   	 *             //read timeout，Is the timeout for data transfer.
   	 *             Both values must be set. If only one is set, either case will block.
   	 *             Then the current application presents a false dead state, which is a serious problem. Almost a lot of big companies have stepped on the pit.
   	 *
   	 * @author: dawn.he QQ:       905845006
   	 * @email: dawn.he@cloudwise.com
   	 * @email: 905845006@qq.com
   	 * @date: 2019/9/23    3:22 PM
   	 */
   	import java.io.*;
   	import java.net.*;
   
   	public class TestUrl {
   		/**
   		 * Compatible with HTTP and FTP protocols
   		 */
   		public static String getDocumentAt(String urlString) {
   			StringBuffer document = new StringBuffer();
   
   			try {
   
   				URL url = new URL(urlString);
   				URLConnection conn = url.openConnection();
   				//connect timeout is the time-out to establish the connection.
   				//read timeout is the time-out for transferring data.
   				conn.setReadTimeout(10000);
   				conn.setConnectTimeout(10000);
   				System.out.println("Get connection---");
   				BufferedReader reader = new BufferedReader(new InputStreamReader(
   						conn.getInputStream()));
   
   
   				String line = null;
   				while ((line = reader.readLine()) != null) {
   					document.append(line + "/n");
   				}
   				reader.close();
   			} catch (MalformedURLException e) {
   				System.out.println("Unable to connect to URL: " + urlString);
   			} catch (IOException e) {
   				System.out.println("IOException when connecting to URL: "
   						+ urlString);
   			}
   			return document.toString();
   		}
   
   		/**
   		 *
   		 * @param args
   		 */
   		public static void main(String[] args) {
   
   			//Test setReadTimeout time-out for data transfer
   			//String documentAt = getDocumentAt("http://localhost:8081/avro/server");
   			//Test the timeout time for setConnect Timeout to establish a connection
   			String documentAt = getDocumentAt("https://www.google.com/search");
   			System.out.println(documentAt);
   		}
   	}
   

2. Annotate

    conn.setReadTimeout(10000);
   
    //And documentAt=
    getDocumentAt("https://www.google.com/search");
   

   Analog links are normal, and data delivery timeouts have been unresponsive.

3. Annotate

    conn.setConnectTimeout(10000);
   
    //And documentAt=
    getDocumentAt("http://localhost:8081/avro/server");
   

   Analog connection timeouts have been unresponsive.

   Another client directly accesses the user without using direct access to the service.

   Server:

   Previously written: https://my.oschina.net/u/3730149/blog/3106915 The main thing is to use the join method.

   The startup class is jar package startup, and new Ceshi.serverr() is omitted from main function.

   To enable client access http://localhost:8081/avro/server

   Note: Once accessed, both the server and the client must be stopped in the test.

   

   

Conclusion: This problem is very serious in production; so lay a good foundation.

If there is a problem with the test, opening the corresponding timeout can interrupt the timeout.
However, it's better to set up both in production. If there is a production problem because of this problem, we can only use jvm analysis tool, which is very troublesome.