使用JSP判定指定日期是星期几
使用JSP判定指定日期是星期几1.按照规定格式输入日期，提交；
2.接受参数，使用SimpleDateFormat处理字符串，如果符合格式转换为Date类型；
3.使用SimpleDateFormat(date,"E")取得日期的星期数；
getWeek.jsp:
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1.<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
2.<%@ page import="java.text.*" %>
3.<%@ page import="java.util.*" %>
4.<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
5.<html>
6.<head>
7.<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
8.<title>GetWeek</title>
9.</head>
10.<body>
11.<%
12. String action = request.getParameter("action");
13. String result = "";
14. if ("getweek".equals(action)) {
15. String dateStr = request.getParameter("date");
16. SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd");
17. SimpleDateFormat sdf2 = new SimpleDateFormat("E");
18. SimpleDateFormat sdf3 = new SimpleDateFormat("yyyy年MM月dd日");
19. Date date = null;
20. try {
21. date = sdf1.parse(dateStr);
22. result = sdf3.format(date) + "是:" + sdf2.format(date);
23. } catch(Exception e) {
24. response.sendRedirect("getWeek.jsp?action=error");
25. }
26. } else if ("error".equals(action)) {
27. result = "日期格式错误，请重新输入！";
28. }
29.%>
30. <form action="getWeek.jsp?action=getweek" method="post">
31. 请输入日期：（格式:2008-08-01）:
32. <input name="date" type="text" />
33. <input type="submit" value="提交" />
34. </form>
35. <%=result %>
36.</body>
37.</html>
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