web.xml 配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<!-- 启动struts2框架 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
UserEntity 实体层
package com.tjitcast.model;
import java.util.Date;
public class UserEntity {
public Integer id;
public String name;
public Double score;
public Boolean gender;
public Date date;
public UserEntity(){
}
public UserEntity(Integer id, String name, Double score, Boolean gender,
Date date) {
this.id = id;
this.name = name;
this.score = score;
this.gender = gender;
this.date = date;
}
/**
* @return the id
*/
public Integer getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Integer id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the score
*/
public Double getScore() {
return score;
}
/**
* @param score the score to set
*/
public void setScore(Double score) {
this.score = score;
}
/**
* @return the gender
*/
public Boolean getGender() {
return gender;
}
/**
* @param gender the gender to set
*/
public void setGender(Boolean gender) {
this.gender = gender;
}
/**
* @return the date
*/
public Date getDate() {
return date;
}
/**
* @param date the date to set
*/
public void setDate(Date date) {
this.date = date;
}
public String info(){
return "该方法是JavaBean中的普通方法";
}
}
OgnlAction 控制器
package com.tjitcast.action;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.tjitcast.model.UserEntity;
public class OgnlAction extends ActionSupport{
private String loginName;
private int age;
private UserEntity user;
private List<String> list1;
private Set<String> set1;
private Map<String,String> map;
private List<UserEntity> listUser;
/* (non-Javadoc)
* @see com.opensymphony.xwork2.ActionSupport#execute()
*/
@Override
public String execute() throws Exception {
this.loginName="张三";
this.age=25;
user=new UserEntity(100, "李四", 88.56, true, new Date());
list1=new ArrayList<String>();
list1.add("apple");
list1.add("baner");
list1.add("ccccc");
set1=new LinkedHashSet<String>(list1);
map=new HashMap<String,String>();
map.put("a","javaSE");
map.put("b", "javaEE");
map.put("c", "javaME");
listUser=new ArrayList<UserEntity>();
listUser.add(new UserEntity(1001,"王五1",85.25,true,new Date()));
listUser.add(new UserEntity(1002,"王五2",82.25,true,new Date()));
listUser.add(new UserEntity(1003,"王五3",90.25,true,new Date()));
ActionContext context=ActionContext.getContext();
context.put("req","req中的数据");
context.getSession().put("session1", "session中的数据");
context.getApplication().put("app", "application中的数据");
ServletActionContext.getRequest().setAttribute("req2", "servlet中request中的数据");
ServletActionContext.getRequest().getSession().setAttribute("session2", "Servlet中session中的数据");
ServletActionContext.getServletContext().setAttribute("app2", "Servet的Application");
return "ognl";
}
public String display(String name){
return name+"这是Action中的普通方法!!!";
}
/**
* @return the loginName
*/
public String getLoginName() {
return loginName;
}
/**
* @param loginName the loginName to set
*/
public void setLoginName(String loginName) {
this.loginName = loginName;
}
/**
* @return the age
*/
public int getAge() {
return age;
}
/**
* @param age the age to set
*/
public void setAge(int age) {
this.age = age;
}
/**
* @return the user
*/
public UserEntity getUser() {
return user;
}
/**
* @param user the user to set
*/
public void setUser(UserEntity user) {
this.user = user;
}
/**
* @return the list1
*/
public List<String> getList1() {
return list1;
}
/**
* @param list1 the list1 to set
*/
public void setList1(List<String> list1) {
this.list1 = list1;
}
/**
* @return the set1
*/
public Set<String> getSet1() {
return set1;
}
/**
* @param set1 the set1 to set
*/
public void setSet1(Set<String> set1) {
this.set1 = set1;
}
/**
* @return the map
*/
public Map<String, String> getMap() {
return map;
}
/**
* @param map the map to set
*/
public void setMap(Map<String, String> map) {
this.map = map;
}
/**
* @return the listUser
*/
public List<UserEntity> getListUser() {
return listUser;
}
/**
* @param listUser the listUser to set
*/
public void setListUser(List<UserEntity> listUser) {
this.listUser = listUser;
}
}
struts.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> <!-- 配置后缀名称 --> <constant name="struts.action.extension" value="action,todo,go,aa,cc"></constant> <!-- 配置是否自动加载struts.xml文件 --> <constant name="struts.configuration.xml.reload" value="true"></constant> <!-- 是否显示更多的调试信息 --> <constant name="struts.devMode" value="true"></constant> <!-- 设置action标签的name属性支持/斜杠 --> <constant name="struts.enable.SlashesInActionNames" value="false"></constant> <!-- 支持动态方法的调用 --> <constant name="struts.enable.DynamicMethodInvocation" value="true"></constant> <!-- 支持ONGL静态方法的调用 --> <constant name="struts.ognl.allowStaticMethodAccess" value="true"/> <package name="myPackage" namespace="/" extends="struts-default"> <action name="ognl" class="com.tjitcast.action.OgnlAction"> <result name="ognl">/ognl.jsp</result> <result name="fail">/fail.jsp</result> </action> </package> </struts>
index.jsp 页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% 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> <title>Struts2中 OGNL 的应用示例</title> </head> <body> <a href="ognl.action">Struts2 OGNL</a> </body> </html>
ognl.jsp 页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s" %>
<%
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>
<title>OGNL 示例页面</title>
</head>
<body>
OGNL访问Action中的普通属性:<s:property value="loginName"/> <s:property value="age"/><br/>
OGNL访问JavaBean中的属性:<s:property value="user.name"/><br/>
OGNL访问List集合对象:<s:property value="list1[2]"/><br/>
OGNL访问Set集合对象:<s:property value="set1.toArray()[0]"/><br/>
OGNL访问Map集合对象:<s:property value="map['b']"/> <s:property value="map.keys.toArray()[0]"/>=<s:property value="map.values.toArray()[0]"/><br/>
OGNL访问List集合中的自定义对象:
<s:property value="listUser[0].name"/><br/>
OGNL访问JavaBean中的方法:<s:property value="user.info()"/><br/>
OGNL访问Action中的方法:<s:property value="display('张三')"/><br/>
OGNL访问静态的常量PI:<s:property value="@java.lang.Math@PI"/><br/>
OGNL访问静态的方法:<s:property value="@@abs(100)"/><br/>
OGNL访问构造方法:<s:property value="new java.util.Date()"/>
<s:date name="new java.util.Date()" format="yyyy-MM-dd"/><br/>
OGNL访问ActionContext中的数据
request:<s:property value="#request.req"/><br/>
session:<s:property value="#session.session1"/><br/>
application:<s:property value="#application.app"/><br/>
OGNL访问ServletActionContext中的数据
request:<s:property value="#request.req2"/><br/>
session:<s:property value="#session.session2"/><br/>
application:<s:property value="#application.app2"/>
attr:<s:property value="#attr.app2"/>
<br/>
OGNL的投影查询
查询出listUser集合中所有的用户名:
<s:property value="listUser.{name}"/><br/>
查询出listUser集合中所有分数大于80的用户名:
<s:property value="listUser.{?#this.score>80}.{name}"/><br/>
查询出listUser集合中所有分数大于80且性别为true的用户名:
<s:property value="listUser.{?#this.score>80 && #this.gender==true}.{name}"/><br/>
查询出listUser集合中所有分数大于8080且性别为true的第一个用户名:
<s:property value="listUser.{^#this.score>80 && #this.gender==true}.{name}"/><br/>
查询出listUser集合中所有分数大于8080且性别为true的最后一个用户名:
<s:property value="listUser.{$#this.score>80 && #this.gender==true}.{name}"/><br/>
</body>
</html>
效果图：