OGNL(对象图导航语言)基础了解
代码如下：Book.java:
package bean;
public class Book {
private String name;
private int price;
private int bookid;
public int getBookid() {
return bookid;
}
public void setBookid(int bookid) {
this.bookid = bookid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public Book(String name, int price, int bookid) {
super();
this.name = name;
this.price = price;
this.bookid = bookid;
}
}
ChaoAction.java:
package chao;
import java.util.ArrayList;
import java.util.List;
import bean.Book;
public class ChaoAction {
private String name;
private List<Book> books;
public List<Book> getBooks() {
return books;
}
public void setBooks(List<Book> books) {
this.books = 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("javaweb1",34,1));
books.add(new Book("javaweb2",322,2));
books.add(new Book("javaweb3",67,3));
name = "chao";
return "list";
}
}
struts.xml:
<?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="chao" extends="struts-default">
<action name="hello_*" class="chao.ChaoAction" method="{1}">
<result name="list">/WEB-INF/page/message.jsp</result>
</action>
</package>
</struts>
message.jsp:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!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>
<s:property value="name" />
${name }
<br /> =======================================
<br />
<!-- 访问books -->
<s:iterator value="books.{?#this.price>60}">
<s:property value="name" />
<s:property value="bookid" />
<s:property value="price" />
<br />
</s:iterator>
</body>
</html>index.jsp:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<%
request.setAttribute("user", "chao");
request.getSession().setAttribute("user", "chao1");
%>
<!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>
<!-- 获得简单属性 -->
<s:property value="#request.user" />
<br />
<s:property value="#session.user" />
<!-- list集合 -->
<s:set var="list" value="{'1','2','3'}" />
<!-- s:iterator会把当前迭代的对象放在栈顶 -->
<s:iterator value="list">
<s:property />
<br />
</s:iterator>
<!-- map集合 -->
<s:set var="maps" value="#{'key1':90,'key2':12,'key3':34}" />
<s:iterator value="maps">
<s:property />
<br />
</s:iterator>
<br /> =======================================
<br />