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/）
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()
