OGNL使用
用多了前端框架很容易忘記各種繁瑣的標簽，這里記錄下ongl：
后臺：
import?java.util.ArrayList;
import?java.util.HashMap;
import?java.util.List;
import?java.util.Map;
import?javax.servlet.ServletContext;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpSession;
import?org.apache.struts2.ServletActionContext;
public?class?Ognl?extends?BaseAction?{
private?List<String>?testlist=new?ArrayList<String>();??
????
public?List<String>?getTestlist()?{
return?testlist;
}
public?void?setTestlist(List<String>?testlist)?{
this.testlist?=?testlist;
}
public?Map<String,?String>?getTestmap()?{
return?testmap;
}
public?void?setTestmap(Map<String,?String>?testmap)?{
this.testmap?=?testmap;
}
//頂級的哦！！！不加#可以獲取是處于actionContext中的
public?String?getTestname()?{
return?testname;
}
public?void?setTestname(String?testname)?{
this.testname?=?testname;
}
private?Map<String,String>?testmap=new?HashMap<String,String>();??
?
private?String?testname="hello,i?am?in?valuestack";??
public?String?ognl(){
/*
*?OGNL測試代碼
**/
HttpServletRequest?request=ServletActionContext.getRequest();?????//對應request
HttpSession?session=request.getSession();//對應session
ServletContext?context=ServletActionContext.getServletContext();??//?對應application
//構造普通的字符串放到三個環境中
request.setAttribute("request_name",??"來自request中的name");
context.setAttribute("application_name","來自application中的name");
session.setAttribute("session_name",?"來自session中的name");
//構造一個list放到request中
List<String>?request_names=new?ArrayList<String>();
request_names.add("reqname1");
request_names.add("reqname2");
request_names.add("reqname3");
request.setAttribute("req_names",?request_names);??
//構造一個map放到rquest中
Map<String,String>?request_maps=new?HashMap<String,String>();
???request_maps.put("request_map1","request_value1");
???request_maps.put("request_map2","request_value2");
???request_maps.put("request_map3","request_value3");
???request.setAttribute("req_maps",?request_maps);??
???
???//構造list放到session中
List<String>?session_names=new?ArrayList<String>();
session_names.add("sessionname1");
session_names.add("sessionname2");
session_names.add("sessionname3");
session.setAttribute("session_names",?session_names);??//放到request中
//構造一個map放到session中
Map<String,String>?session_maps=new?HashMap<String,String>();
session_maps.put("session_map1","session_value1");
session_maps.put("session_map2","session_value2");
session_maps.put("session_map3","session_value3");
???session.setAttribute("session_maps",?session_maps);
???
???//賦值到ActionContext值棧中的對象
???//ActionContext中的testlist???
???testlist.add("vs144444");
???testlist.add("vs24444");
???testlist.add("vs34444");
???testlist.add("vs44444444");
???
?//ActionContext中的testmap?
???testmap.put("mp1",?"vsmap1");
???testmap.put("mp2",?"vsmap2");
???testmap.put("mp3",?"vsmap3");
???testmap.put("mp4",?"vsmap5555");
???
???//ActionContext中的score
//???testscore.put("語文",95);
//???testscore.put("數學",75);
//???testscore.put("英語",55);
//???testscore.put("生物",65);
//???testscore.put("物理",85);
//???testscore.put("化學",44);
???return?SUCCESS;
}?
}
前臺展示：
<%@?page?language="java"?import="java.util.*"?pageEncoding="UTF-8"%>
<%@?taglib?prefix="s"?uri="/struts-tags"%>
<%
String?path?=?request.getContextPath();
String?basePath?=?request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">
<html>
??<head>
????<base?href="<%=basePath%>">
????
????<title>My?JSP?'list.jsp'?starting?page</title>
????
<meta?http-equiv="pragma"?content="no-cache">
<meta?http-equiv="cache-control"?content="no-cache">
<meta?http-equiv="expires"?content="0">????
<meta?http-equiv="keywords"?content="keyword1,keyword2,keyword3">
<meta?http-equiv="description"?content="This?is?my?page">
<!--
<link?rel="stylesheet"?type="text/css"?href="styles.css">
-->
??</head>
??
??<body> ?
????<br><hr>顯示來自各個范圍中的值<br>
actionContext中的testname:<s:property?value="testname"?/>?<br>
request中的request_name:<s:property?value="#request.request_name"?/><br>
application中的session_name:<s:property?value="#application.application_name"?/><br>
session中的session_name:<s:property?value="#session.session_name"?/><br>
遍歷request中的list:request_names<p>
<s:iterator?value="#request.req_names">
<s:property?/><br>?
</s:iterator>
遍歷request中的map:request_maps<p>
<s:iterator?value="#request.req_maps">
<s:property?value="key"/>=<s:property?value="value"?/><br>
</s:iterator>
遍歷session中的list:session_names<p>
<s:iterator?value="#session.session_names">
<s:property?/>?<br>
</s:iterator>
遍歷session中的map:session_maps<p>
<s:iterator?value="#session.session_maps">
<s:property?value="key"/>=<s:property?value="value"?/><br>
</s:iterator>
遍歷ActionContext中的testlist=========================<p>
<s:iterator?value="testlist"?>
<s:property?/><br>
</s:iterator>
遍歷actionContext中的testmap<p>
<s:iterator?value="testmap">
<s:property?value="key"/>=<s:property?value="value"?/><br>
</s:iterator>
?直接遍歷list<p>
<s:iterator?value="{'第一年','第二年','第三年'}"?>
<s:property?/><br>
</s:iterator>
直接遍歷map?<p>
<s:iterator?value="#{'luo1':'羅先橋1','luo2':'羅先橋2','luo3':'羅先橋3'}">
<s:property?value="key"?/>:<s:property?value="value"/><br>
</s:iterator>
遍歷actionContext中的testscore這個map<p>
<s:iterator?value="testscore">
<s:property?value="key"/>:
<s:if?test="value<60">
不及格<br>
</s:if>
<s:elseif?test="value>=60?&&?value<75">
及格<br>
</s:elseif>
<s:elseif?test="value>=75?&&?value<85">
良好<br>
</s:elseif>
<s:else>
優秀<br>
</s:else>
</s:iterator>
??</body>
</html>
總結
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