struts第十四天--ognl表达式，对象图导航语言
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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="person" namespace="/person" extends="struts-default">
<action name="list" class="com.isoftstone.study.PersonListAction">
<result name="list">/WEB-INF/page/personlist.jsp</result>
</action>
</package>
</struts>
package com.isoftstone.study;
import java.util.ArrayList;
import java.util.List;
public class PersonListAction {
private String name;
private List<Book> books;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String execute(){
books=new ArrayList<Book>();
books.add(new Book(1,"javaweb",12));
books.add(new Book(2,"java",22));
books.add(new Book(3,"spring",44));
name="小王";
return "list";
}
}
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
request.setAttribute("user","isoftstone");
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>index.jsp</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
<!-- s:iterator在迭代集合时有个特点：会把当前迭代的对象放在值栈栈定 -->
<s:property value="#request.user"/>
<s:set name="list" value="{'slf','sf','sfasd'}" />
<s:iterator value="#list">
<s:property/><br>
</s:iterator>
<s:set name="maps" value="#{'key1':'第一个','key2':'第二个','key3':'第三个'}" />
<s:iterator value="#maps">
<s:property value="key"/>=<s:property value="value"/><br>
</s:iterator>
<s:set name="list1" value="{'zhangming','xiaoi','liming'}" />
<s:iterator value="#list1" id="n">
<s:property value="n"/><br>
</s:iterator>
<s:set name="foobar" value="#{'foo1sdf':'bar1', 'foo2sd':'bar2'}" />
<s:iterator value="#foobar" >
<s:property value="key"/>=<s:property value="value"/><br>
</s:iterator>
======================================================================================
<s:if test="'foo' in {'foo','too'}" >
在
</s:if>
<s:else>
不在
</s:else>
<s:if test="'xxx' not in {'foo','too'}" >
不在
</s:if>
<s:else>
在
</s:else>
</body>
</html>
package com.isoftstone.study;
public class Book {
private Integer bookid;
private String name;
private Integer price;
public Integer getBookid() {
return bookid;
}
public void setBookid(Integer bookid) {
this.bookid = bookid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getPrice() {
return price;
}
public void setPrice(Integer price) {
this.price = price;
}
public Book(Integer bookid, String name, Integer price) {
this.bookid = bookid;
this.name = name;
this.price = price;
}
}
<%@ 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>结果</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
<s:property value="name"/><br/>
${name }
===========================================================<br/>
<s:iterator value="books.{?#this.price>13}">
<s:property value="name"/>,价格：<s:property value="price"/><br>
</s:iterator>
</body>
</html>
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