🔄Update: 使用 Hutool 创建线程池

README.md

@@ -1 +1 @@
-> 注意：Java ExecutorService 使用的默认等待队列是无限大小的 `LinkedBlockingQueue`，容易 OOM，不推荐使用
+https://doc.hutool.cn/pages/ExecutorBuilder

pom.xml

@@ -23,6 +23,12 @@
     </parent>
 
     <dependencies>
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-core</artifactId>
+            <version>5.8.31</version>
+        </dependency>
+
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>

src/main/java/cn/hezhaohui/threadpool/ThreadPoolApplication.java

@@ -1,34 +1,42 @@
 package cn.hezhaohui.threadpool;
 
+import cn.hutool.core.thread.ExecutorBuilder;
 import lombok.extern.slf4j.Slf4j;
 
-import java.util.Random;
+import java.util.concurrent.ArrayBlockingQueue;
-import java.util.concurrent.ExecutorService;
+import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
 @Slf4j
 public class ThreadPoolApplication {
-    public static void main(String[] args) throws InterruptedException {
+    public static void main(String[] args) {
-        ExecutorService executorService = Executors.newFixedThreadPool(2);
+        ExecutorBuilder builder = new ExecutorBuilder();
-        for (int i = 0; i < 100000000; i++) {
+        ThreadPoolExecutor executor = builder
-            executorService.execute(() -> {
+                .setCorePoolSize(5)
-                StringBuilder builder = new StringBuilder();
+                .setMaxPoolSize(10)
-                int random = new Random().nextInt(1000);
+                .setKeepAliveTime(0)
-                for (int j = 1; j < random; j++) {
+                .setHandler(new RejectedExecutionHandler(){
-                    builder.append(j);
+                    @Override
+                    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
+                        log.info(r.toString());
                     }
-                try {
+                })
-                    TimeUnit.HOURS.sleep(1);
+                .setWorkQueue(new ArrayBlockingQueue<>(100))
-                } catch (InterruptedException e) {
+                .build();
-                    log.error("[Error]");
-                }
-                log.info(builder.toString());
 
+        for (int i = 1; i <= 1000; i++) {
+            executor.execute(() -> {
+                log.info("Hello");
+                try {
+                    Thread.sleep(1000);
+                } catch (InterruptedException e) {
+                    throw new RuntimeException(e);
+                }
             });
         }
 
-        executorService.shutdown();
+        executor.shutdown();
-        executorService.awaitTermination(1, TimeUnit.HOURS);
+
     }
 }