JSTL核心库常用标签举例

JSTL核心库常用标签举例（详解）

struts-config.xml：

          "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
          "http://struts.apache.org/dtds/struts-config_1_3.dtd">

 
        type="com.yulin.struts.JSTLCoreAction"
     >
    
  
   

演示的JSP页面(jstlcore.jsp)：

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

Test JSTL

---

TEST c:out

---

core(el): ${core }

core(el.empty): ${empty core }

core(default):

core(default):

core(default="123456"):

---

html(el): ${core2 }

html(el.requestScope): ${requestScope.core2 }

html(default):

html(escapeXml="true"):

html(escapeXml="false"):

html(default="输出html文件"):

html(default="输出html文件"escapeXml="false"):

---

TEST c:set c:remove

---

temp(c:set): ${temp }


temp(c:remove): ${temp }

---

TEST c:if

---

v1小于v2,${r }



v2da于v1,${r }

---

TEST c:choose,c:when,c:otherwise

---

   v1小于v2





   v1da于v2



   v1xiaoyuv2

---

TEST c:forEach varStatus="vs" begin="4" end="40" step="5"

---

  
  
  


  
  
   
  
  
  
   
    
     
      
     
     
      
     
    
    
     
     
     
    
  
  

Username	Age	Group
there is no info!
${user.username }	${user.age }	${user.group.name }

---

TEST c:fortokens delims="," var="f"

---

${f }

---

TEST c:catch

---

<%
Integer.parseInt("sss");
%>

${e }

---

TEST c:import

---

---

TEST c:url c:param

---

${turl }

---

TEST c:redirect [context]url

---

所需的JSTLCoreAction页面(JSTLCoreAction.java):

package com.yulin.struts;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class JSTLCoreAction extends Action {

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
    HttpServletRequest request, HttpServletResponse response)
    throws Exception {
   request.setAttribute("core", "core");
   request.setAttribute("core1", "");
   //输出html文件
   request.setAttribute("core2", "输出html文件");
   request.setAttribute("core3", "");
   request.setAttribute("v1", 1);
   request.setAttribute("v2", 2);
   request.setAttribute("v3", "");
 
   List userList = new ArrayList();
   for(int i=0;i<50;i++){
    Group g = new Group();
    g.setName("China");
    User u = new User();
    u.setUsername("LinZhang" + i);
    u.setAge(23);
    u.setGroup(g);
    userList.add(u);
   }
   request.setAttribute("userList", userList);
 
   request.setAttribute("fortokens", "a,b,c,d,e,f,g");
   return mapping.findForward("success");
}

}

涉及到的User（User.java）和Group(Group.java)页面：

User.java:

package com.yulin.struts;

public class User {
private String username;
private int age;
private Group group;
public String getUsername() {
   return username;
}
public void setUsername(String username) {
   this.username = username;
}
public int getAge() {
   return age;
}
public void setAge(int age) {
   this.age = age;
}
public Group getGroup() {
   return group;
}
public void setGroup(Group group) {
   this.group = group;
}
}

Group.java:

package com.yulin.struts;

public class Group {
private String name;

public String getName() {
   return name;
}

public void setName(String name) {
   this.name = name;
}
}