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JSTL之c标签 收藏
Student.java： package com.myapp.beans;
public class Student {
private String sno;
private String sname;
private Integer sage;
private String ssex;
private String deptno;
public Student(String sno, String sname, Integer sage, String ssex,
String deptno) {
this.sno = sno;
this.sname = sname;
this.sage = sage;
this.ssex = ssex;
this.deptno = deptno;
}
public String getDeptno() {
return deptno;
}
public void setDeptno(String deptno) {
this.deptno = deptno;
}
public Integer getSage() {
return sage;
}
public void setSage(Integer sage) {
this.sage = sage;
}
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public String getSno() {
return sno;
}
public void setSno(String sno) {
this.sno = sno;
}
public String getSsex() {
return ssex;
}
public void setSsex(String ssex) {
this.ssex = ssex;
}
}
ShowServlet.java：
package com.myapp.servlets;
import java.io.IOException;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import com.myapp.beans.Student;
public class ShowServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//定义10个学生对象
Student s[] = new Student[10];
s[0] = new Student("s001","张三",15,"女","d002");
s[1] = new Student("s002","李四",15,"男","d002");
s[2] = new Student("s003","王五",16,"女",null);
s[3] = new Student("s004","赵六",15,"男","d004");
s[4] = new Student("s005","田七",17,"女","d002");
s[5] = new Student("s006","周八",15,"男",null);
s[6] = new Student("s007","付九",19,"女","d003");
s[7] = new Student("s008","王莹",16,"男",null);
s[8] = new Student("s009","罗剑",15,"男","d002");
s[9] = new Student("s010","宇飞",15,"男","d002");
//将数据装入List
List l = new ArrayList();
for(int i=0;i<s.length;i++){
l.add(s[i]);
}
//将List放入session
request.getSession().setAttribute("allstudents", l);
//跳转到要显示的页面
response.sendRedirect("index.jsp");
}
}
web.xml：
<servlet>
<servlet-name>ShowServlet</servlet-name>
<servlet-class>com.myapp.servlets.ShowServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ShowServlet</servlet-name>
<url-pattern>/show</url-pattern>
</servlet-mapping>
我们通过以上代码，虚拟出一些数据，供页面的标签调用，在实际项目中，可改为由数据库读取。
<c:out>
index.jsp： <%@page contentType="text/html;charset=gb2312"%>
<%@taglib prefix="c" uri="http://java./jsp/jstl/core"%>
<HTML>
<HEAD>
<TITLE>JSTL之C标签</TITLE>
</HEAD>
<BODY>
<table border="1">
<c:forEach var="student" items="${allstudents}">
<tr>
<td><c:out value="${student.sno}"/></td>
<td><c:out value="${student.sname}"/></td>
<td><c:out value="${student.ssex}"/></td>
<td><c:out value="${student.deptno}" default="no deptno specified"/></td>
</tr>
</c:forEach>
</table>
</BODY>
</HTML>
<c:set>
index.jsp： <%@page contentType="text/html;charset=gb2312"%>
<%@taglib prefix="c" uri="http://java./jsp/jstl/core"%>
<HTML>
<HEAD>
<TITLE>JSTL之C标签</TITLE>
</HEAD>
<BODY>
<c:set var="studentTable" scope="session">
<table border="1">
<c:forEach var="student" items="${allstudents}">
<tr>
<td><c:out value="${student.sno}"/></td>
<td><c:out value="${student.sname}"/></td>
<td><c:out value="${student.ssex}"/></td>
<td><c:out value="${student.deptno}" default="no deptno specified"/></td>
</tr>
</c:forEach>
</table>
</c:set>
<A HREF="show.jsp">前进</A>
</BODY>
</HTML>
我们通过<c:set>标签，把一个可以显示的表格，保存到session对象的属性中，到下一页显示。
show.jsp：
<%@page contentType="text/html;charset=gb2312"%>
<%@taglib prefix="c" uri="http://java./jsp/jstl/core"%>
<HTML>
<HEAD>
<TITLE>JSTL之C标签</TITLE>
</HEAD>
<BODY>
<c:out value="${studentTable}" escapeXml="false"/>
</BODY>
</HTML>
注意这里的escapeXml="false"属性，如果为true，则会把HTML标签显示在网页里。
<c:if>
index.jsp： <%@page contentType="text/html;charset=gb2312"%>
<%@taglib prefix="c" uri="http://java./jsp/jstl/core"%>
<HTML>
<HEAD>
<TITLE>JSTL之C标签</TITLE>
</HEAD>
<BODY>
<c:forEach var="student" items="${allstudents}">
<c:if test="${student.deptno == 'd002'}">
${student.sname}<br>
</c:if>
</c:forEach>
</BODY>
</HTML>
<c:choose>
index.jsp： <%@page contentType="text/html;charset=gb2312"%>
<%@taglib prefix="c" uri="http://java./jsp/jstl/core"%>
<HTML>
<HEAD>
<TITLE>JSTL之C标签</TITLE>
</HEAD>
<BODY>
<c:forEach var="student" items="${allstudents}">
<c:choose>
<c:when test="${student.deptno == 'd003'}">
<font color="blue">
</c:when>
<c:when test="${student.deptno == 'd004'}">
<font color="red">
</c:when>
<c:otherwise>
<font color="green">
</c:otherwise>
</c:choose>
${student.sname}</font><br>
</c:forEach>
</BODY>
</HTML>
<c:forEach>
index.jsp： <%@page contentType="text/html;charset=UTF-8"%>
<%@taglib prefix="c" uri="http://java./jsp/jstl/core"%>
<HTML>
<HEAD>
<TITLE>JSTL之C标签</TITLE>
</HEAD>
<BODY>
<c:forEach var="i" begin="1" end="10">
${i} •
</c:forEach>
</BODY>
</HTML>
以上是简单的定义变量，指定其变化范围，循环显示。
index.jsp：
<%@page contentType="text/html;charset=gb2312"%>
<%@taglib prefix="c" uri="http://java./jsp/jstl/core"%>
<HTML>
<HEAD>
<TITLE>JSTL之C标签</TITLE>
</HEAD>
<BODY>
<c:forEach var="student" items="${allstudents}" begin="2" end="9" step="2">
<c:out value="${student.sno}"/><br>
</c:forEach>
</BODY>
</HTML>
这个例子与<c:out>的类似，只是在循环时可以指定起始位子和步长。
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/sony87615/archive/2009/10/15/4675501.aspx
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