spring ThreadPoolTaskExecutor的線程池類實現多線程

1.初始化ThreadPoolTaskExecutor

   <bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
        <!-- 線程池維護線程的最少數量 -->
        <property name="corePoolSize" value="5" />
        <!-- 允許的空閒時間 -->
        <property name="keepAliveSeconds" value="200" />
        <!-- 線程池維護線程的最大數量 -->
        <property name="maxPoolSize" value="10" />
        <!-- 緩存隊列 -->
        <property name="queueCapacity" value="20" />
        <!-- 對拒絕task的處理策略 -->
        <property name="rejectedExecutionHandler">
            <bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy" />
        </property>
    </bean>

2.定義多線程Demo

/**
 * 多線程併發處理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();
    }

}

3.將線程放入線程池

@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);
        }
    }
}