javaBean_EL

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<%@ 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">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%-- 
<h4>${1+1}</h4>
<h4>${2-3}</h4>
<h4>${7/2}</h4>
<h4>${7%2}</h4>
<h4>${1==2}</h4>
<h4>${1==1}</h4>
<p>${true||false}</p>${3>2 ? '大于':'小于'}
<p>${true&&false}</p>${!true} ${empty 'abc'} ${empty ''} ${empty ""} ${3>2 ? "大于":"小于"} --%>

<h4>${param.userName}</h4>
<h4>${param.passWord}</h4>


<jsp:useBean id="emp" class="svlt.Emp" scope="page"></jsp:useBean>

<jsp:setProperty property="name" name="emp" param="userName"/>
<jsp:setProperty property="age" name="emp" param="passWord"/>

------------------表单提交--------------

-------------------------Emp类------------------

package svlt;

public class Emp {
String name;
int age;
public Emp() {
  super();
}
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;
}

}

--------------------------------

<%//向不同范围内写入参数
request.setAttribute("user_name","request user_name");
session.setAttribute("user_name","sesssion user_name");
application.setAttribute("user_name","application user_name");
%>
<h5>Request:${requestScope['user_name']}</h5>
<h5>Session:${sessionScope['user_name']}</h5>
<h5>Not set Scope:${user_name}</h5>

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