map, list常用遍历, pattern匹配, 文件读取, ThreadLocal

每次用时,老忘~~就此mark,看你还忘,哈哈哈~~

哎,老了,越来越不中用了~~

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private static Map<String, String> projectIPInfo = new HashMap<String, String>(); //如果key相同,后加的会覆盖前加的,put(), get(), contains()

private static Map<String, String> projectIPMaskedInfo = new HashMap<String, String>();

private static Map<String, Pattern> projectIPMaskedPatternInfo = new HashMap<String, Pattern>();

private static Map<String, List<String>> projectIPBlackInfo = new HashMap<String, List<String>>();

for(Iterator it = projectIPBlackInfo.get("project1").iterator(); it.hasNext(); ){

System.out.println(it.next());

}

 

for(Iterator it = projectIPMaskedInfo.entrySet().iterator(); it.hasNext(); ){

Map.Entry entry = (Map.Entry)it.next();

System.out.println(entry.getKey());

System.out.println(entry.getValue());

}

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for (Iterator it = projectIPMaskedInfo.entrySet().iterator(); it.hasNext();) {

Map.Entry entry = (Map.Entry) it.next();

Pattern p = projectIPMaskedPatternInfo.get(entry.getKey());

// 如果IP匹配上了这个正则表达式

if (p.matcher(ip).matches()) {

String tem = "-" + ip;

// 如果匹配上了正则式,但该IP却位于黑名单

if (checkBlackList(entry.getValue().toString(), tem)) {

continue;

} else {// 如果匹配上的正则式,且该IP不在黑名单中

projName2 = entry.getValue().toString();

break;

}

}

}

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InputStream in = null;

File file = new File("C:/hello7.txt");

try {

in = new FileInputStream(file);

}catch(IOException e){

System.out.println("read file exception......................");

}

List<List<String>> outputs = new ArrayList<List<String>>();

        BufferedReader br = new BufferedReader(new InputStreamReader(in));

        String line = null;

 

        line = br.readLine();

        while((line)!=null && !line.equals("-----")){

line = br.readLine();

}

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threadLocal使用方法:引自(http://lavasoft.blog.51cto.com/62575/51926/

1、在多线程的类(如ThreadDemo类)中,创建一个ThreadLocal对象threadxxx,用来保存线程间需要隔离处理的对象xxx。
2、在ThreadDemo类中,创建一个获取要隔离访问的数据的方法getxxx(),在方法中判断,若ThreadLocal对象为null时候,应该new()一个隔离访问类型的对象,并强制转换为要应用的类型。
3、在ThreadDemo类的run()方法中,通过getxxx()方法获取要操作的数据,这样可以保证每个线程对应一个数据对象,在任何时刻都操作的是这个对象。

 

实例来自:(http://blog.csdn.net/qjyong/article/details/2158097

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public class SimpleThreadLocal {
	private Map valueMap = Collections.synchronizedMap(new HashMap());

	public void set(Object newValue) {

		valueMap.put(Thread.currentThread(), newValue);// ①键为线程对象,值为本线程的变量副本

	}

	public Object get() {

		Thread currentThread = Thread.currentThread();

		Object o = valueMap.get(currentThread);// ②返回本线程对应的变量

		if (o == null && !valueMap.containsKey(currentThread)) {// ③如果在Map中不存在,放到Map中保存起来。

			o = initialValue();

			valueMap.put(currentThread, o);

		}

		return o;

	}

	public void remove() {

		valueMap.remove(Thread.currentThread());

	}

	public Object initialValue() {

		return null;

	}
}

  

public class SequenceNumber {
	// ①通过匿名内部类覆盖ThreadLocal的initialValue()方法,指定初始值

	private static ThreadLocal<Integer> seqNum = new ThreadLocal<Integer>() {

	public Integer initialValue() {

			return 0;

		}

	};

	// ②获取下一个序列值

	public int getNextNum() {

		seqNum.set(seqNum.get() + 1);//seqNum Map: <thread1, value1>

		return seqNum.get();

	}

	public static void main(String[] args)

	{

		SequenceNumber sn = new SequenceNumber();//一个SequenceNumber对象

		// ③ 3个线程共享sn,各自产生序列号

		TestClient t1 = new TestClient(sn); //放到不同的线程中,线程间共享这个对象,但一个线程却维护着一个单独的副本

		TestClient t2 = new TestClient(sn);

		TestClient t3 = new TestClient(sn);
		

		t1.start();

		t2.start();

		t3.start();

	}

	private static class TestClient extends Thread

	{

		private SequenceNumber sn;

		public TestClient(SequenceNumber sn) {

			this.sn = sn;

		}

		public void run()

		{

			for (int i = 0; i < 3; i++) { // ④每个线程打出3个序列值

				System.out.println("thread[" + Thread.currentThread().getName()
						+

						"] sn[" + sn.getNextNum() + "]");

			}

		}

	}

}

  

日期的获取:

// 今天周五,查询本周一一天的量

Date now = new Date();

Date start = DateUtil.addDays(now, MONDAY);//周一

start = DateUtil.setHoursToEmpty(start);// 周一0点

Date end = DateUtil.addDays(now, MONDAY+1);//周二

end = DateUtil.setHoursToEmpty(end);//周二0点

end = DateUtil.addSeconds(end, -1);// 周二23点59分59秒

 

//查询上周周一的量

        Date lastWeekNow = DateUtil.addDays(now, LASTMONDAY);

        Date lastWeekStart = DateUtil.addDays(lastWeekNow, 0);//上周一

        lastWeekStart = DateUtil.setHoursToEmpty(lastWeekStart);// 上周一0点

        Date lastWeekEnd = DateUtil.addDays(now, LASTMONDAY+1) ;//上周二

        lastWeekEnd = DateUtil.setHoursToEmpty(lastWeekEnd);// 上周二0点

        lastWeekEnd = DateUtil.addSeconds(lastWeekEnd, -1);// 上周二23点59分59秒   

 

new BigDecimal(mvUsedMem.avgValue).setScale(2,BigDecimal.ROUND_HALF_UP).toEngineeringString()

posted @ 2011-09-02 10:37  技术草根女  Views(1099)  Comments(0Edit  收藏  举报