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- pagecontext
   name  林杰      regster  regster  linjie.com.regster      regster  /regster    

<%@ page language="java" contenttype="text/html; charset=utf-8"
 pageencoding="utf-8"%> insert title here  name=${initparam.name }

package linjie.com;
/*
 *bean 
 */
public class demo {
 private string name;
 private int age;
 public demo(string name,int age){
  this.name=name;
  this.age=age;
 }
 public string getname() {
  return name;
 }
 public void setname(string name) {
  this.name = name;
 }
 public int getage() {
  return age;
 }
 public void setage(int age) {
  this.age = age;
 }
 @override
 public string tostring() {
  return super.tostring();
 }

}

<%@ page language="java" contenttype="text/html; charset=utf-8"
 import="linjie.com.demo"
 pageencoding="utf-8"%> insert title here  <%
  demo test=new demo("linjie",12);
  request.setattribute("elttt", test);
 %>
 name=${requestscope.elttt.name }

 age=${requestscope.elttt.age }


 
 names=${requestscope.eltttxx.name }

<%@ page language="java" contenttype="text/html; charset=utf-8"
 pageencoding="utf-8"%> insert title here   

 <%
  string[] names={"xlj","lucy","king"};
  pagecontext.setattribute("names", names);
 %>
 name[1]=${names[1] }


 
 names[5]=${names[5] }

package linjie.com;
/*
 *bean 
 */
public class stu {
 private string sname;
 private string address;
 public stu() {
  super();
 }

 public stu(string sname, string address) {
  super();
  this.sname = sname;
  this.address = address;
 }

 public string getsname() {
  return sname;
 }

 public void setsname(string sname) {
  this.sname = sname;
 }

 public string getaddress() {
  return address;
 }

 public void setaddress(string address) {
  this.address = address;
 }

 @override
 public string tostring() {
  return super.tostring();
 }


}

<%@ page language="java" contenttype="text/html; charset=utf-8"
 import="linjie.com.*"
 pageencoding="utf-8"%> insert title here  <%
  stu[] stus=new stu[3];
  stus[0]=new stu("xlj","a");
  stus[1]=new stu("lucy","b");
  stus[2]=new stu("kinga","c");
  pagecontext.setattribute("stus",stus);
 %>
 stus[1].sname=${stus[1].sname }

<%@page import="java.util.*"%>
<%@ page language="java" contenttype="text/html; charset=utf-8"
 pageencoding="utf-8"%> insert title here  <%
  list names=new arraylist();
  names.add("xlj");
  names.add("lucy");
  pagecontext.setattribute("names", names);
 %>

 
 names[1]=${names[1] }

<%@page import="java.util.*"%>
<%@ page language="java" contenttype="text/html; charset=utf-8"
 pageencoding="utf-8"%> insert title here  <%
  map map=new hashmap();
  map.put("age", 20);
  map.put("name", "xlj");
  pagecontext.setattribute("map", map);
 %>
 name=${map.name }

 age=${map.age }

<%@page import="java.util.*"%>
<%@ page language="java" contenttype="text/html; charset=utf-8"
 pageencoding="utf-8"%> insert title here  <%
  string name1=null;
  string name2="";
  list name3=new arraylist();

  pagecontext.setattribute("name1", name1);
  pagecontext.setattribute("name2", name2);
  pagecontext.setattribute("name3", name3);
 %>
 empty對于沒有定義的變量，運算結果為true：
 empty namex=${empty namex }


 empty對于null的引用，運算結果為true：
 empty name1=${empty name1 }


 empty對于為空串的string引用，運算結果為true：
 empty name2=${empty name2 }


 empty對于沒有元素的數組或集合，運算結果為true：
 empty name3=${empty name3 }

package linjie.com;


//自定義函數
//該類及其函數,需要在擴展名為.tld的xml文件中注冊
//tld：tag library definition（標簽庫定義）
//xml文件是需要約束的,即需要配置文件頭部。這個頭部約束可以從一下文件中進行復制
//在tomcat安裝目錄下：webapps\examples\web-inf\jsp2
//文件為：jsp2-example-taglib.tld

//這個.tld的xml文件，需要定義在當前web項目的web-inf目錄下，在此目錄下創建以.tld結尾的xml文件
//將jsp2-example-taglib.tld中頭部復制到創建的xml文件中

//再將函數注冊，還是在jsp2-example-taglib.tld底部中復制
public class myel {
 private static myel instance;
 public static myel getinstance() {
  if(instance==null)
  {
   instance=new myel();
  }
  return instance;
 }

 //字符串小寫變大寫
 public static string lowertoupper(string str) {
  return str.touppercase();
 }
}

  
 a tag library exercising simpletag handlers.  1.0  myel
 http://tomcat.apache.org/jsp2-example-taglib  
     mylowertoupper   linjie.com.myel
  java.lang.string lowertoupper( java.lang.string )
   

<%@ page language="java" contenttype="text/html; charset=utf-8"
 pageencoding="utf-8"%>
<%@ taglib uri="http://tomcat.apache.org/jsp2-example-taglib" prefix="myel" %> insert title here  
 ${myel:mylowertoupper("sasas") }



 
 <%
  string name="xlj";
  pagecontext.setattribute("name", name);
 %>
 ${myel:mylowertoupper(name) }