Question

我使用带有多个线程的Java编程服务器，很早就买了我遇到了一个非常奇怪的故障。

这是我的代码：

package net.twh;

import java.net.DatagramSocket;
import java.util.Scanner;

public class Server {

    public static EntryThread entry;
    public static ServerPhases phase;
    public static DatagramSocket serverSocket;

    public static boolean stopProgram;

    public static Scanner keyboard;

    public static void main(String[] args) {
        Configuration.port = 17550;

        keyboard = new Scanner(System.in);

        entry = new EntryThread();

        entry.run();

        while (!stopProgram)
        {
            String line = "";
            System.out.printf("> ");
            line = keyboard.next();

            System.out.printf(line);

            if (line == "close")
            {
                entry.stop = true;
                stopProgram = true;
            }
        }
    } 

}

这是我的主题：

package net.twh;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;

public class EntryThread extends Thread {

    public boolean stop;

    public EntryThread() {
        stop = false;
    }

    public void run() { 
        Runtime.getRuntime().addShutdownHook(new Thread(){public void run(){ // AUTOCLOSE NE PAS SUPPRIMER !!!!!
            try {
                Server.serverSocket.close();
                System.out.println("The server is shut down!");
            } catch (Exception e) { /* failed */ }
        }});

        try {
            Server.serverSocket = new DatagramSocket(Configuration.port);
            byte[] receiveData = new byte[8];

            System.out.printf("Listening on udp:%s:%d%n",
            InetAddress.getLocalHost().getHostAddress(), Configuration.port);     
            DatagramPacket receivePacket = new DatagramPacket(receiveData,
                               receiveData.length);
            while(!stop) {
                Server.serverSocket.receive(receivePacket);
                byte[] data = receivePacket.getData();
                System.out.println("RECEIVED: " + new String(data));
                InetAddress IPAddress = receivePacket.getAddress();
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

接收数据包时的消息有效且扫描仪有效，但＆＃34;＆gt; ＆＃34;我输入的字符串不显示。

Answer 1

您没有启动该线程，您只是按顺序执行该线程的run()方法。启动线程的正确方法是调用entry.start()而不是entry.run()。

另见：

https://docs.oracle.com/javase/tutorial/essential/concurrency/runthread.html

Answer 2

<batch:job id="GhanshyamESCatalogUpdater"> <batch:step id="GhanshyamCatalogUpdater2" > <batch:partition step="slave" partitioner="rangePartitioner"> <batch:handler grid-size="15" task-executor="taskExecutor" /> </batch:partition> </batch:step> <batch:listeners> <batch:listener ref="jobFailureListener"/> </batch:listeners> </batch:job> <bean id="rangePartitioner" class="org.springframework.batch.core.partition.support.MultiResourcePartitioner" scope="step"> <property name="resources" value="file:#{jobParameters['job.partitionDir']}/x*"> </property> </bean> <step id="slave" xmlns="http://www.springframework.org/schema/batch"> <tasklet> <chunk reader="gsbmyntraXmlReader" writer="gsbmyntraESWriter" commit-interval="1000" /> </tasklet> </step>的流是<bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor"> <property name="corePoolSize" value="100" /> <property name="allowCoreThreadTimeOut" value="true" /> <property name="WaitForTasksToCompleteOnShutdown" value="true" /> </bean>，仅在换行符时刷新其输出（请参阅this answer）。但您可以明确调用System.out或打印换行符（在您的示例中甚至会更好看）：

PrintStream

由于我不明白为什么你使用flush()而没有任何格式化，我用适当的方法替换它。

BTW：JMSilla是对的，你的代码没有同时执行任何操作，但这不是问题。

Answer 3

现在你调用run方法而不是start（），Thread中的run（）方法是start在运行时创建新线程并不创建任何线程，只需像普通方法调用一样在当前线程中执行。

entry = new EntryThread();
entry.run();

使用

entry.start()

Println和Java中的线程

3 个答案: