Java 如何在轮询开始前插入秒表
我可以知道如何从Java 如何在轮询开始前插入秒表,java,Java,我可以知道如何从Poll()方法中为这段代码插入秒表吗?我必须计算开始计数,以便在数据库启动之前以及轮询所花费的时间 public void poll() throws Exception { st = conn.createStatement(); for (int i=0; i<10; i++) { Timestamp start; rs = st.executeQuery( "select * from msg_ne
Poll()
方法中为这段代码插入秒表吗?我必须计算开始计数,以便在数据库启动之前以及轮询所花费的时间
public void poll() throws Exception {
st = conn.createStatement();
for (int i=0; i<10; i++)
{
Timestamp start;
rs = st.executeQuery( "select * from msg_new_to_bde" );
Timestamp end;
//speed = end - start;
Collection<KpiMessage> pojoCol = new ArrayList<KpiMessage>();
while (rs.next()) {
KpiMessage filedClass = convertRecordsetToPojo(rs);
pojoCol.add(filedClass);
}
for (KpiMessage pojoClass : pojoCol) {
System.out.println("=== Iteratioin Nr. " + i + "====");
System.out.print(pojoClass.getSequence());
System.out.print(pojoClass.getTableName());
System.out.print(pojoClass.getEntryTime());
System.out.print(pojoClass.getProcessingTime());
System.out.println(pojoClass.getStatus());
// System.out.println(pojoClass.getprocessDuration());
}
System.out.print(pojoCol.size());
}
}
public void poll()引发异常{
st=conn.createStatement();
对于(int i=0;i您必须使用currentTimeMillis()函数:
启动轮询之前:
long start = System.currentTimeMillis();
轮询执行后:
long stop= System.currentTimeMillis();
执行时间是以毫秒为单位的停止-启动。我相信系统。currentTimeMillis
是您需要的
long startTime = System.currentTimeMillis();
//
long endTime = System.currentTimeMillis();
System.out.println((endTime - startTime) + "ms");
此方法比System.currentTimeMillis()更精确
引自java API:
返回最精确的可用系统计时器的当前值,
以纳秒为单位
java.util.Date date = new java.util.Date();
Timestamp start = new Timestamp(date.getTime());
//process
java.util.Date date1 = new java.util.Date();
Timestamp end = new Timestamp(date1.getTime());
long start = System.currentTimeMillis();
rs = st.executeQuery( "select * from msg_new_to_bde" );
long stop= System.currentTimeMillis();
System.out.println("execution time: " +stop-start + " ms");
long start = System.nanoTime();
timeThisMethod();
long end = System.nanoTime();
long howLongDidItTake = end - start;