java 中多线程和锁的使用

关键词： implements  实现  Runnable 类

run()  方法

注意点 ： 创建类的实例 InterfaceController inter=new InterfaceController();  的时候，不要放在循环中  , 如果放在循环中 run 方法中的lock  是起不到作用的，

正确写法 看下面的例子

@Controller
@RequestMapping("/interface")
public class InterfaceController implements Runnable{

private Lock lock = new ReentrantLock();
private List<LoaneePriorityModel> listPage;
int k = 1;
public void setlistPage(List<LoaneePriorityModel> listPage)
{
this.listPage = listPage;
}

public void setk(int k)
{
this.k = k;
}
private Lock lock2 = new ReentrantLock();
/* 类Runnable 的具体实现方法
* @see java.lang.Runnable#run()
*/
public void run(){
lock2.lock();
try{
if(k==1)
{
log.info(MessageFormat.format("k==1睡眠5秒:{0}",""));
Thread.sleep(5000);// 睡眠100毫秒
}
List<LoaneePriorityModel> aa=listPage;
log.info(MessageFormat.format("输出数据集条数：{0}", aa.size()));
}
catch(Exception ex)
{
log.info(MessageFormat.format("多线程异常信息：{0}",ex));
}
finally{
lock2.unlock();
}
}

@RequestMapping(value = "updateLoaneePriorityNew", method = RequestMethod.POST)
@ResponseBody
public int updateLoaneePriorityNew(HttpServletRequest request,
@RequestBody String requestBody) {

lock.lock();
try {
JSONArray json = JSONArray.fromObject(requestBody);
log.info(MessageFormat.format("更改借款工单优先级 ,接收到的josn字符串：{0}", json));
System.out.println(MessageFormat.format(
"更改借款工单优先级 ,接收到的josn字符串：{0}", json));
List<LoaneePriorityModel> persons = (List<LoaneePriorityModel>) JSONArray
.toCollection(json, LoaneePriorityModel.class);
InterfaceController inter=new InterfaceController();
for (int i = 0; i <= persons.size(); i++) {
// 写修改优先级的主体方法
int f=2; //定义每组的数量
if(i==f*k-1&&i!= persons.size())
{
log.info(MessageFormat.format("-----f*k等于：{0}", f*k));
listPage= persons.subList(0, f*k);

log.info(MessageFormat.format("输入数据集条数：{0}", listPage.size()));
inter.setlistPage(listPage);
inter.setk(k);
Thread t = new Thread(inter);
Thread.sleep(5000);// 睡眠100毫秒
t.start();
k++;
}
if(i== persons.size())
{
log.info(MessageFormat.format("=====f*(k-1)等于：{0}", f*(k-1)));
listPage= persons.subList(f*(k-1), persons.size());
//InterfaceController inter=new InterfaceController();
log.info(MessageFormat.format("输入数据集条数：{0}", listPage.size()));
inter.setlistPage(listPage);
Thread t = new Thread(inter);
inter.setk(k);
t.start();
k++;

}
}

} catch (Exception ex) {
log.info(MessageFormat.format("更改借款工单优先级 ,出现异常：{0}", ex));
System.out.println(MessageFormat.format("更改借款工单优先级 ,出现异常：{0}", ex));
} finally {
lock.unlock();
}
return k;
}

}

//-----------------------------------------------------------------------------------------------------------

多线程二：不需要继承 实现  Runnable 接口的方式

ExecutorService    需要引用包     package java.util.concurrent;

ExecutorService threadPool = Executors.newFixedThreadPool(ConstantUtil.THREAD_POOL_SIZE);

threadPool.submit(new Callable<String>() {
@Override
public String call() throws Exception {
batchStartProcessCancel(list,user);
return null;
}

});