JSP绋?搴?璁捐?＄?涔?--绗?涓?绔?-璇惧??涔?棰?7
- 棰?3-7 Tag??璁?/li>
-
- 浠ｇ??璁捐??/li>
-
- index.jsp
- index2.jsp
- GetArea.tag
- 杩?琛?????
棰?3-7 Tag??璁?/h1>
缂???涓?涓?Tag??浠?etArea.tag璐?璐ｆ??轰?瑙?褰㈢???㈢Н锛?骞朵娇??ariable??浠よ???涓?瑙?褰㈢???㈢Н缁?璋??ㄨ??ag??浠剁??JSP椤甸????JSP椤甸?㈣?璐ｆ?剧ずTag??浠惰????? 涓?瑙?褰㈢???㈢Н??JSP?ㄨ???ag??浠舵?讹?浣跨??ttribute??浠ゅ?涓?瑙?褰??杈圭???垮害浼? ??缁?Tag??浠躲??one.jsp??two.jsp?戒娇??ag??璁拌???etArea.tag??one.jsp灏?杩?????涓?瑙?褰㈢???㈢Н淇?????澶?3浣?灏??帮?two.jsp灏?杩?????涓?瑙?褰㈢???㈢Н淇?????澶?6浣?灏??般??
浠ｇ??璁捐??/h2> index.jsp
<%@ page contentType="text/html;charset=GB2312" language="java" %>
<%@taglib prefix="calculator" tagdir="/WEB-INF/tags" %>
<html>
<body bgcolor="aqua">
<table cellspacing="1" cellpadding="1" width="20%" border="0">
<tr valign="bottom">
<td><a href="/index.jsp"><font size=3>index.jsp淇???涓?浣?灏???lt;/font> </a> </td>
<td><a href="/index2.jsp"><font size=3>index2.jsp淇?????浣?灏???lt;/font> </a> </td>
</tr>
</table>
<p>杈??ヤ?瑙?褰???¤竟???硷?璁＄??涓?瑙?褰㈢???㈢Н
<form action="" method="get" name="form">
<table>
<tr>
<td>杈??ヨ竟a???硷?</td>
<td><input type="text" name="a"></td>
</tr>
<tr>
<td>杈??ヨ竟b???硷?</td>
<td><input type="text" name="b"></td>
</tr>
<tr>
<td>杈??ヨ竟c???硷?</td>
<td><input type="text" name="c"></td>
</tr>
</table>
<br><input type="submit" value="??浜? name="submit">
</form>
<%
String a = request.getParameter("a");
String b = request.getParameter("b");
String c = request.getParameter("c");
if (a!=null&&b!=null&&c!=null){
%> <calculator:GetArea numberA="<%=a%>" numberB="<%=b%>" numberC="<%=c%>" d="one"/>
<br><%=message%>
<br><%=area%>
<% }
%>
</body>
</html>
index2.jsp
<%@ page contentType="text/html;charset=GB2312" language="java" %>
<%@taglib prefix="calculator" tagdir="/WEB-INF/tags" %>
<html>
<body bgcolor="#7fffd4">
<table cellspacing="1" cellpadding="1" width="20%" border="0">
<tr valign="bottom">
<td><a href="/index.jsp"><font size=3>index.jsp淇???涓?浣?灏???lt;/font> </a> </td>
<td><a href="/index2.jsp"><font size=3>index2.jsp淇?????浣?灏???lt;/font> </a> </td>
</tr>
</table>
<p>杈??ヤ?瑙?褰???¤竟???硷?璁＄??涓?瑙?褰㈢???㈢Н锛?
<form action="" method="get" name="form">
<table>
<tr>
<td>杈??ヨ竟a???硷?</td>
<td><input type="text" name="a"></td>
</tr>
<tr>
<td>杈??ヨ竟b???硷?</td>
<td><input type="text" name="b"></td>
</tr>
<tr>
<td>杈??ヨ竟c???硷?</td>
<td><input type="text" name="c"></td>
</tr>
</table>
<br><input type="submit" value="??浜? name="submit">
</form>
<%
String a = request.getParameter("a");
String b = request.getParameter("b");
String c = request.getParameter("c");
if (a!=null&&b!=null&&c!=null){
%> <calculator:GetArea numberA="<%=a%>" numberB="<%=b%>" numberC="<%=c%>" d="two"/>
<br><%=message%>
<br><%=area%>
<% }
%>
</body>
</html>
GetArea.tag
<%@ tag pageEncoding="GB2312" %>
<%@attribute name="numberA" required="true" %>
<%@attribute name="numberB" required="true" %>
<%@attribute name="numberC" required="true" %>
<%@attribute name="d" required="true" %>
<%@variable name-given="area" scope="AT_END" %>
<%@variable name-given="message" scope="AT_END" %>
<%!
public double getArea(double a, double b, double c){
if (a+b>c&&a+c>b&&b+c>a){
double p = (a+b+c)/2.0;
double area = Math.sqrt(p*(p-a)*(p-b)*(p-c));
return area;
}
else
return -1;
}
%>
<%
try{
double a = Double.parseDouble(numberA);
double b = Double.parseDouble(numberB);
double c = Double.parseDouble(numberC);
double result = 0;
if (d.equals("one")){
result = getArea(a,b,c);
jspContext.setAttribute("area", String.format("%.3f", result));
jspContext.setAttribute("message", "姹?寰??㈢Н淇???3浣?灏???);
}
else if (d.equals("two")){
result = getArea(a,b,c);
jspContext.setAttribute("area", String.format("%.6f", result));
jspContext.setAttribute("message", "姹?寰??㈢Н淇???6浣?灏???);
}
}catch (Exception e){
jspContext.setAttribute("area", new Double(-1.0));
jspContext.setAttribute("message", e.toString());
}
%>
杩?琛?????
- index.jsp
JSP程序设计练习--第三章-课后习题7题3-7 Tag标记 JSP程序设计练习--第三章-课后习题7题3-7 Tag标记 - index2.jsp
JSP程序设计练习--第三章-课后习题7题3-7 Tag标记 JSP程序设计练习--第三章-课后习题7题3-7 Tag标记
<%@ page contentType="text/html;charset=GB2312" language="java" %>
<%@taglib prefix="calculator" tagdir="/WEB-INF/tags" %>
<html>
<body bgcolor="aqua">
<table cellspacing="1" cellpadding="1" width="20%" border="0">
<tr valign="bottom">
<td><a href="/index.jsp"><font size=3>index.jsp淇???涓?浣?灏???lt;/font> </a> </td>
<td><a href="/index2.jsp"><font size=3>index2.jsp淇?????浣?灏???lt;/font> </a> </td>
</tr>
</table>
<p>杈??ヤ?瑙?褰???¤竟???硷?璁＄??涓?瑙?褰㈢???㈢Н
<form action="" method="get" name="form">
<table>
<tr>
<td>杈??ヨ竟a???硷?</td>
<td><input type="text" name="a"></td>
</tr>
<tr>
<td>杈??ヨ竟b???硷?</td>
<td><input type="text" name="b"></td>
</tr>
<tr>
<td>杈??ヨ竟c???硷?</td>
<td><input type="text" name="c"></td>
</tr>
</table>
<br><input type="submit" value="??浜? name="submit">
</form>
<%
String a = request.getParameter("a");
String b = request.getParameter("b");
String c = request.getParameter("c");
if (a!=null&&b!=null&&c!=null){
%> <calculator:GetArea numberA="<%=a%>" numberB="<%=b%>" numberC="<%=c%>" d="one"/>
<br><%=message%>
<br><%=area%>
<% }
%>
</body>
</html>
<%@ page contentType="text/html;charset=GB2312" language="java" %>
<%@taglib prefix="calculator" tagdir="/WEB-INF/tags" %>
<html>
<body bgcolor="#7fffd4">
<table cellspacing="1" cellpadding="1" width="20%" border="0">
<tr valign="bottom">
<td><a href="/index.jsp"><font size=3>index.jsp淇???涓?浣?灏???lt;/font> </a> </td>
<td><a href="/index2.jsp"><font size=3>index2.jsp淇?????浣?灏???lt;/font> </a> </td>
</tr>
</table>
<p>杈??ヤ?瑙?褰???¤竟???硷?璁＄??涓?瑙?褰㈢???㈢Н锛?
<form action="" method="get" name="form">
<table>
<tr>
<td>杈??ヨ竟a???硷?</td>
<td><input type="text" name="a"></td>
</tr>
<tr>
<td>杈??ヨ竟b???硷?</td>
<td><input type="text" name="b"></td>
</tr>
<tr>
<td>杈??ヨ竟c???硷?</td>
<td><input type="text" name="c"></td>
</tr>
</table>
<br><input type="submit" value="??浜? name="submit">
</form>
<%
String a = request.getParameter("a");
String b = request.getParameter("b");
String c = request.getParameter("c");
if (a!=null&&b!=null&&c!=null){
%> <calculator:GetArea numberA="<%=a%>" numberB="<%=b%>" numberC="<%=c%>" d="two"/>
<br><%=message%>
<br><%=area%>
<% }
%>
</body>
</html>
<%@ tag pageEncoding="GB2312" %>
<%@attribute name="numberA" required="true" %>
<%@attribute name="numberB" required="true" %>
<%@attribute name="numberC" required="true" %>
<%@attribute name="d" required="true" %>
<%@variable name-given="area" scope="AT_END" %>
<%@variable name-given="message" scope="AT_END" %>
<%!
public double getArea(double a, double b, double c){
if (a+b>c&&a+c>b&&b+c>a){
double p = (a+b+c)/2.0;
double area = Math.sqrt(p*(p-a)*(p-b)*(p-c));
return area;
}
else
return -1;
}
%>
<%
try{
double a = Double.parseDouble(numberA);
double b = Double.parseDouble(numberB);
double c = Double.parseDouble(numberC);
double result = 0;
if (d.equals("one")){
result = getArea(a,b,c);
jspContext.setAttribute("area", String.format("%.3f", result));
jspContext.setAttribute("message", "姹?寰??㈢Н淇???3浣?灏???);
}
else if (d.equals("two")){
result = getArea(a,b,c);
jspContext.setAttribute("area", String.format("%.6f", result));
jspContext.setAttribute("message", "姹?寰??㈢Н淇???6浣?灏???);
}
}catch (Exception e){
jspContext.setAttribute("area", new Double(-1.0));
jspContext.setAttribute("message", e.toString());
}
%>