Spring线程池ThreadPoolTaskExecutor配置详情

<!-- spring thread pool executor -->   
 <bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
  <!-- 线程池维护线程的最少数量 -->
  <property name="corePoolSize" value="5" />
  <!-- 允许的空闲时间 -->
  <property name="keepAliveSeconds" value="200" />
  <!-- 线程池维护线程的最大数量 -->
  <property name="maxPoolSize" value="10" />
  <!-- 缓存队列 -->
  <property name="queueCapacity" value="20" />
  <!-- 对拒绝task的处理策略 -->
  <property name="rejectedExecutionHandler">
   <bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy" />
  </property>
 </bean>

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = { MultiThreadConfig.class })
public class MultiThreadTest {

 @Autowired
 private ThreadPoolTaskExecutor taskExecutor;

 @Autowired
 private MultiThreadProcessService multiThreadProcessService;
 
 @Test
 public void test() {
  int n = 20;
  for (int i = 0; i < n; i++) {
   taskExecutor.execute(new MultiThreadDemo(multiThreadProcessService));
   System.out.println("int i is " + i + ", now threadpool active threads totalnum is " + taskExecutor.getActiveCount());
  }
  
  try {
   System.in.read();
  } catch (IOException e) {
   throw new RuntimeException(e);
  }
 }
}

/**
 * 多线程并发处理demo
 * @author daniel.zhao
 *
 */
public class MultiThreadDemo implements Runnable {
 private MultiThreadProcessService multiThreadProcessService; 
 public MultiThreadDemo() {
 }
 
 public MultiThreadDemo(MultiThreadProcessService multiThreadProcessService) {
  this.multiThreadProcessService = multiThreadProcessService;
 }
 
 @Override
 public void run() {
  multiThreadProcessService.processSomething();
 }
}

@Service
public class MultiThreadProcessService {
 public static final Logger logger = Logger.getLogger(MultiThreadProcessService.class);
 
 /**
  * 默认处理流程耗时1000ms
  */
 public void processSomething() {
  logger.debug("MultiThreadProcessService-processSomething" + Thread.currentThread() + "......start");
  try {
   Thread.sleep(1000);
  } catch (InterruptedException e) {
   throw new RuntimeException(e);
  }
  logger.debug("MultiThreadProcessService-processSomething" + Thread.currentThread() + "......end");
 }
}

 @Configuration
 @ComponentScan(basePackages = { "com.xxx.multithread" })
 @ImportResource(value = { "classpath:config/application-task.xml" })
 @EnableScheduling
 public class MultiThreadConfig {
 }