spring线程池的应用

加载xml文件

在ApplicationContext.xml文件里面添加

xmlns:task="http://www.springframework.org/schema/task"

xmlns:task="http://www.springframework.org/schema/task"

xmlns文件并且xsi:schemaLocation中添加

http://www.springframework.org/schema/task

http://www.springframework.org/schema/task 

http://www.springframework.org/schema/task/spring-task.xsd

http://www.springframework.org/schema/task/spring-task.xsd

在spring中配置Executor

在ApplicationContext.xml文件里面添加

<bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
        <!-- 核心线程数 -->
        <property name="corePoolSize" value="${task.core_pool_size}" />
        <!-- 最大线程数 -->
        <property name="maxPoolSize" value="${task.max_pool_size}" />
        <!-- 队列最大长度 -->
        <property name="queueCapacity" value="${task.queue_capacity}" />
        <!-- 线程池维护线程所允许的空闲时间，默认为60s -->
        <property name="keepAliveSeconds" value="${task.keep_alive_seconds}" />
    </bean>
    <!-- 注解式 -->
    <task:annotation-driven />

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   <bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
2.  
   <!-- 核心线程数 -->
3.  
   <property name="corePoolSize" value="${task.core_pool_size}" />
4.  
   <!-- 最大线程数 -->
5.  
   <property name="maxPoolSize" value="${task.max_pool_size}" />
6.  
   <!-- 队列最大长度 -->
7.  
   <property name="queueCapacity" value="${task.queue_capacity}" />
8.  
   <!-- 线程池维护线程所允许的空闲时间，默认为60s -->
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   <property name="keepAliveSeconds" value="${task.keep_alive_seconds}" />
10.  
    </bean>
11.  
    <!-- 注解式 -->
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    <task:annotation-driven />

在dbconfig.properties添加

maxOpenPreparedStatements=20
removeAbandoned=true
removeAbandonedTimeout=1800
logAbandoned=true

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   maxOpenPreparedStatements=20
2.  
   removeAbandoned=true
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   removeAbandonedTimeout=1800
4.  
   logAbandoned=true

这是分别对线程池做配置

 

添加依赖注入

在所需要的service或者controller类里面添加

@Resource(name = "taskExecutor")
private TaskExecutor taskExecutor;

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   @Resource(name = "taskExecutor")
2.  
   private TaskExecutor taskExecutor;

使用线程池进行并发操作

代码如下

taskExecutor.execute(new Runnable() {

    @Override
    public void run() {
        // TODO Auto-generated method stub
        try {
                                       //要进行的并发操作
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
});

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   taskExecutor.execute(new Runnable() {
2.  
    
3.  
   @Override
4.  
   public void run() {
5.  
   // TODO Auto-generated method stub
6.  
   try {
7.  
   //要进行的并发操作
8.  
   } catch (Exception e) {
9.  
   // TODO Auto-generated catch block
10.  
    e.printStackTrace();
11.  
    }
12.  
    }
13.  
    });

 

提示

注意在线程中操作变量时候变量的作用域范围。需要在这个controller或者sevice中声明变量如下

 

@Controller
public class IndexController {
int studentscount = 0;
@RequestMapping(value = "/index.html")
    public ModelAndView goIndex() {
        logBefore(logger, "列表Center");
        ModelAndView mv = this.getModelAndView();
                taskExecutor.execute(new Runnable() {

                @Override
                public void run() {
                    // TODO Auto-generated method stub
                    // 得到所有学生人数
                    try {
                                          studentscount = coursesService.getStudentCount(pd);
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                }
            });
                  mv.addObject("studentscount", studentscount);
                  mv.setViewName("common/index");
                  return mv;
｝

1.  
   @Controller
2.  
   public class IndexController {
3.  
   int studentscount = 0;
4.  
   @RequestMapping(value = "/index.html")
5.  
   public ModelAndView goIndex() {
6.  
   logBefore(logger, "列表Center");
7.  
   ModelAndView mv = this.getModelAndView();
8.  
   taskExecutor.execute(new Runnable() {
9.  
    
10.  
    @Override
11.  
    public void run() {
12.  
    // TODO Auto-generated method stub
13.  
    // 得到所有学生人数
14.  
    try {
15.  
    studentscount = coursesService.getStudentCount(pd);
16.  
    } catch (Exception e) {
17.  
    // TODO Auto-generated catch block
18.  
    e.printStackTrace();
19.  
    }
20.  
     
21.  
    }
22.  
    });
23.  
    mv.addObject("studentscount", studentscount);
24.  
    mv.setViewName("common/index");
25.  
    return mv;
26.