Question

我有以下JSP代码，我可以查看javascript代码的运行时间，但我无法检查servlet进程的运行时间，runTime始终为0，我该怎么办？

<%@ page contentType="text/html; charset=UTF-8"%>
<%@ page import="java.util.List"%>
<%@ page import="java.util.ArrayList"%>
<%
    long startTime = System.currentTimeMillis();
    MyForm myForm = (MyForm) request.getAttribute(ACTION_FORM_KEY);
    if(myForm == null) {
        myForm = new PsiSearchForm();
    }

    List<Object> myList = myForm.getMyList();
    if(myList == null) {
        myList = new ArrayList<Object>();
    }
    long endTime = System.currentTimeMillis();
    long runTime = endTime - startTime;
%>
<html>
    ...
</form>
</body>
<script language="JavaScript" type="text/JavaScript">
    console.time('my_form.jsp');
    // javascript process
    console.timeEnd('my_form.jsp');
    console.log("Select My List time: " + <%=runTime%>);
</script>
</html>

Answer 1

尝试使用System.nanoTime();

来自Oracle

   long startTime = System.nanoTime();
   // ... the code being measured ...
   long estimatedTime = System.nanoTime() - startTime;

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1 个答案: