Struts2 OGNL的一个例子
目录结构：
下面直接给出源码：
ognl.jsp:
<%@ page language="java" contentType="text/html; charset=gb2312" pageEncoding="gb2312" %><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head> <title>OGNL示例</title></head><body> <!-- OGNL显示request、response中的值 --> <h3 align="left">Session和Request值</h3> request.materialName: <s:property value="#request.materialName" /><br/> session.materialName: <s:property value="#session.materialName" /><br/> <!-- OGNL显示条件表达式过滤的数据 --> <h3 align="left">根据条件显示数据</h3> <p>价格小于50元的建材</p> <ul> <s:iterator value="materials.{?#this.mainbid <50}"> <li><s:property value="materialName"/> 建材价格是 <s:property value="mainbid"/>元!</li> </s:iterator> </ul> <p> "人造石台面" 的库存数量是: <s:property value="materials.{?#this.materialName=='人造石台面'}.{mount}[0]"/></p> <!-- OGNL新建Map类型数据集合，显示子元素值 --> <h3 align="left">Map数据显示</h3> <s:set name="frank" value="#{'material':'欧龙无苯油漆(六度)', 'mount':'500'}" /> <p>供销商frank手里还有建材: <s:property value="#frank['material']" /></p> <p>库存量为:<s:property value="#frank['mount']" /></p> </body></html>
OgnlExampleAction.java:
package action;import java.util.ArrayList;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;import model.Material;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class OgnlExampleAction extends ActionSupport {//设置request、response参数和需要显示的数据集合定义private HttpServletRequest request; private HttpSession session; private List<Material> materials;public String execute() throws Exception { request = ServletActionContext.getRequest(); session=request.getSession(); //设置request、session存放值 request.setAttribute("materialName","人造石台面 From request"); session.setAttribute("materialName","欧龙无苯油漆(六度) From session"); //初始化数据集合，集合类型为List materials = new ArrayList<Material>(); materials .add(new Material("欧龙无苯油漆(六度)", 100, 2000)); materials .add(new Material("6*10mm门套线红影木夹板饰面(单面)", 20, 2900)); materials .add(new Material("人造石台面", 56, 800));return SUCCESS;}public HttpServletRequest getRequest() {return request;}public void setRequest(HttpServletRequest request) {this.request = request;}public HttpSession getSession() {return session;}public void setSession(HttpSession session) {this.session = session;}public List<Material> getMaterials() {return materials;}public void setMaterials(List<Material> materials) {this.materials = materials;}}
Material.java:
package model;//材料对象public class Material {//材料名private String materialName;//材料价格private int mainbid;//材料数量private int mount;//构造初始化数据public Material(String materialName, int mainbid, int mount) {super();this.materialName = materialName;this.mainbid = mainbid;this.mount = mount;}public String getMaterialName() {return materialName;}public void setMaterialName(String materialName) {this.materialName = materialName;}public int getMainbid() {return mainbid;}public void setMainbid(int mainbid) {this.mainbid = mainbid;}public int getMount() {return mount;}public void setMount(int mount) {this.mount = mount;}}
struts.xml:
<?xml version="1.0" encoding="gb2312"?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <constant name="struts.i18n.encoding" value="gb2312"/> <package name="Tag" extends="struts-default"> <!-- 创建Action --> <action name="ognl" class="action.OgnlExampleAction"><result name="success">/jsp/ognl.jsp</result></action> </package></struts>
结果：
Session和Request值
request.materialName: 人造石台面 From request
session.materialName: 欧龙无苯油漆(六度) From session //"欧....."这个字串第一次不输出，刷新页面时才显示
根据条件显示数据
价格小于50元的建材
6*10mm门套线红影木夹板饰面(单面) 建材价格是 20元!"人造石台面" 的库存数量是: 800
Map数据显示
供销商frank手里还有建材: 欧龙无苯油漆(六度)
库存量为:500