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Ognl标签常用例子只能在Struts2中使用

2016-08-22 23:40 603 查看

效果如下图：

ognl.jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>title</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">

</head>

<body>

<%--映射栈：带# --%>
<s:property value="#name"/> 
<s:property value="#request.name"/> 
<s:property value="#session.name"/> 
<s:property value="#application.name"/> 
<s:property value="#parameters"/> <%--参数 --%>
<s:property value="#attr.request.name"/> <%--attribute将request、session和application封装起来 --%>
<s:property value="#attr.session.name"/> 
<s:property value="#attr.application.name"/> 

<%--ognl算法 --%>

<s:property value="30+20"/> 
<s:property value="true&&true"/> 
<s:property value="true&&false"/> 
<s:property value="true||false"/> 
<s:property value="false||false"/> 
<s:property value="!false"/> 
<s:property value="false?'真的':'假的'"/> 

<%--创建数组或集合 --%>
<s:property value="{'小火','傻鸟','小黑','十品'}"/> 
<%--集合 --%>
<s:property value="#{'1':'小火','2':'傻鸟','3':'小黑','4':'十品'}"/>

<s:debug></s:debug>
</body>
</html>

ognlDemo.java

package star.july.ognl;
import java.util.Map;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class OgnlDemo extends ActionSupport{
Student student;
public void setStudent(Student student) {
this.student = student;
}

public String set(){
student.setName("陈二狗");
ActionContext ac = ActionContext.getContext();
//自己放值
ac.put("name", student);

Map rp = (Map) ac.get("request");
rp.put("name", student);
Map<String, Object> session = ac.getSession();
session.put("name", student);
Map<String, Object> application = ac.getApplication();
application.put("name", student);
Map<String, Object> parameters = ac.getParameters();
parameters.put("name", student);

System.out.println(student);
return SUCCESS;
}
}

实体类，Student.java
package star.july.ognl;
public class Student {
public String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Student [name=" + name + "]";
}

}

xml配置：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="student" namespace="/" extends="struts-default">
<action name="student" class="star.july.ognl.OgnlDemo" method="set">
<result name="success">/ognl.jsp</result>
</action>
</package>

</struts>

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Ognl标签常用例子 只能在Struts2中使用

Ognl标签常用例子只能在Struts2中使用