JSTL 标准标签库
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt"%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSTL IF 标签</title> </head> <body> <form action="JstlServlet" method="post"> 姓名:<input name="stuName"><br> 年龄:<input name="age"><br> 性别:<input name="sex" type="radio" value="m">男 <input name="sex" type="radio" value="f">女<br> 学历: <input name="level" type="radio" value="zk">专科 <input name="level" type="radio" value="bk" checked="checked">本科 <input name="level" type="radio" value="ss">硕士 <input name="level" type="radio" value="bs">博士 <input name="level" type="radio" value="qt">其他<br> <input type="submit" value="提 交"><br> </form> </body> </html>
package com.xzit.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.xzit.domain.Student; /** * Servlet implementation class JstlServlet */ @WebServlet("/JstlServlet") public class JstlServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public JstlServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response) */ protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name = request.getParameter("stuName"); String sex = request.getParameter("sex"); String age = request.getParameter("age"); String lev = request.getParameter("level"); int ageInt = 10; if(age != null) { ageInt = Integer.parseInt(age); } Student stu = new Student(); stu.setAge(ageInt); stu.setStuName(name); stu.setSex(sex); stu.setLevel(lev); request.setAttribute("student", stu); request.getRequestDispatcher("iftag.jsp").forward(request, response); } }
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt"%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSTL IF 标签</title> </head> <body> <!-- IF 标签的使用 --> <c:if test="${requestScope.student ne null}"> <c:if test="${requestScope.student.sex eq 'm'}"> <img src="imgs/m.png"/> </c:if> <c:if test="${requestScope.student.sex eq 'f'}"> <img src="imgs/f.png"/> </c:if> <br> <!-- choose when 标签的使用 --> <c:choose> <c:when test="${requestScope.student.level eq 'zk'}"> 学生：${requestScope.student.stuName}的学历是：<span style="color:red;font-size:24px">专科</span> </c:when> <c:when test="${requestScope.student.level eq 'bk'}"> 学生：${requestScope.student.stuName}的学历是：<span style="color:red;font-size:24px">本科</span> </c:when> <c:when test="${requestScope.student.level eq 'ss'}"> 学生：${requestScope.student.stuName}的学历是：<span style="color:red;font-size:24px">研究生</span> </c:when> <c:when test="${requestScope.student.level eq 'bs'}"> 学生：${requestScope.student.stuName}的学历是：<span style="color:red;font-size:24px">博士</span> </c:when> <c:otherwise> 学生：${requestScope.student.stuName}的学历是：<span style="color:red;font-size:24px">其它学历水准</span> </c:otherwise> </c:choose> </c:if> </body> </html>
package com.xzit.domain; public class Student { private String stuName; private int age; private String sex; private String level; //学历 public String getStuName() { return stuName; } public void setStuName(String stuName) { this.stuName = stuName; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public String getLevel() { return level; } public void setLevel(String level) { this.level = level; } public Student() { } public Student(String stuName, int age) { super(); this.stuName = stuName; this.age = age; } }
