OGNL入门 及 理解
package org.darkness.ognl.test;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import junit.framework.TestCase;
import ognl.Ognl;
import org.darkness.oa.model.Person;
import org.darkness.oa.model.User;
public class OgnlTest extends TestCase {
?
?// ***************** root对象的概念 ******************* //
?public void testOgnl_01() throws Exception{
??User user = new User();
??user.setUsername("暗之幻影");
??
??//相当于调用user.getUsername()方法
??String value = (String)Ognl.getValue("username", user);
??System.out.println(value);
?}
?
?public void testOgnl_02() throws Exception{
??User user = new User();
??Person p = new Person();
??p.setName("暗之幻影");
??user.setPerson(p);
??
??//相当于调用user.getPerson().getName()方法
??String value = (String)Ognl.getValue("person.name", user);
??System.out.println(value);
?}
?
?public void testOgnl_03() throws Exception{
??User user = new User();
??Person p = new Person();
??p.setName("暗之幻影");
??user.setPerson(p);
??
??//可以使用#root来引用根对象，相当于调用user.getPerson().getName()方法
??String value = (String)Ognl.getValue("#root.person.name", user);
??System.out.println(value);
?}
?
?// *********************** context的概念 **********************//
?public void testOgnl_04() throws Exception{
??Person p1 = new Person();
??Person p2 = new Person();
??p1.setName("风");
??p2.setName("云");
??Map<String,Person> context = new HashMap<String,Person>();
??context.put("p1", p1);
??context.put("p2", p2);
??
??// 需要加上#才表示到context中取数据，否则表示从根目录下取值
??String value = (String)Ognl.getValue("#p1.name + ',' + #p2.name", context, new Object());
??System.out.println(value);
?}
?
?public void testOgnl_05() throws Exception{
??Person p1 = new Person();
??Person p2 = new Person();
??p1.setName("风");
??p2.setName("云");
??
??Map<String,Person> context = new HashMap<String,Person>();
??context.put("p1", p1);
??context.put("p2", p2);
??
??User root = new User();
??root.setUsername("雨");
??
??String value = (String)Ognl.getValue("#p1.name + ',' + #p2.name + ',' + username", context, root);
??System.out.println(value);
?}
?
?// ******************* OGNL赋值操作 ************************//
?public void testOgnl_06() throws Exception{
??User user = new User();
??
??//给root对象的属性赋值，相当于调用user.setUsername()
??Ognl.setValue("username", user, "暗之幻影");
??
??System.out.println(user.getUsername());
?}
?
?public void testOgnl_07() throws Exception{
??User user = new User();
??Map<String, User> context = new HashMap<String, User>();
??context.put("u", user);
??
??//给context中的对象属性赋值，相当于调用user.setUsername()
??Ognl.setValue("#u.username", context, new Object(), "暗之幻影");
??
??System.out.println(user.getUsername());
?}
?
?public void testOgnl_08() throws Exception{
??User user = new User();
??
??Map<String, User> context = new HashMap<String, User>();
??context.put("u", user);
??
??//给context中的对象属性赋值，相当于调用user.setUsername()
??//在表达式中使用=赋值操作符来赋值
??Ognl.getValue("#u.username = '暗之幻影'",context, new Object());
??
??System.out.println(user.getUsername());
?}
?
?public void testOgnl_09() throws Exception{
??User user = new User();
??Person p = new Person();
??
??Map<String,Object> context = new HashMap<String,Object>();
??context.put("u", user);
??context.put("p", p);
??
??//给context中的对象属性赋值，相当于调用user.setUsername()
??//在表达式中使用=赋值操作符来赋值
??Ognl.getValue("#u.username = '风',#p.name = '云'",context, new Object());
??
??System.out.println(user.getUsername()+","+p.getName());
?}
?
?//****************** 使用OGNL调用对象的方法 **********************//
?public void testOgnl_10() throws Exception{
??User user = new User();
??user.setUsername("暗之幻影");
??
??String value = (String)Ognl.getValue("getUsername()", user);
??System.out.println(value);
?}
?
?public void testOgnl_11() throws Exception{
??User user = new User();
??
??Ognl.getValue("setUsername('暗之幻影')", user);
??System.out.println(user.getUsername());
?}
?
?// ******************* OGNL调用类变量、静态方法 *************************//
?public void testOgnl_12() throws Exception{
??User user = new User();
??
??Ognl.getValue("setUsername('暗之幻影')", user);
??Ognl.getValue("@System@out.println(username)", user);
?}
?
?public void testOgnl_13() throws Exception{
??User user = new User();
??
??Ognl.getValue("setUsername('暗之幻影')", user);
??Ognl.getValue("@System@out.println(@org.darkness.struts2.test.Utils@toLowerCase(username))", user);
?}
?
?// ********************* OGNL中的this表达式 **********************//
?public void testOgnl_14() throws Exception{
??Object root = new Object();
??Map context = new HashMap();
??
??List values = new ArrayList();
??for(int i=0; i<11; i++){
???values.add(i);
??}
??context.put("values", values);
??
??Ognl.getValue("@System@out.println(#values.size.(#this > 10 ? "大于10" : '不大于10'))", context, root);
??
?}
?
?public void testOgnl_15() throws Exception{
??User user = new User();
??
??Ognl.getValue("setUsername('暗之幻影')", user);
??Ognl.getValue("@System@out.println(#this.username)", user);
?}
?
?public void testOgnl_16() throws Exception{
??User user = new User();
??
??Ognl.getValue("setUsername('暗之幻影')", user);
??Ognl.getValue("@System@out.println(username.(#this.toLowerCase()))", user);
?}
?
?// ******************* 如何把表达式的解释结果作为另外一个表达式,OGNL中括号的使用 **********************//
?public void testOgnl_17() throws Exception{
??Object root = new Object();
??Map context = new HashMap();
??User u = new User();
??u.setUsername("暗之幻影");
??context.put("u", u);
??context.put("fact", "username");
??
??/**
?? * 1、首先把#fact表达式进行解释，得到一个值：username
?? * 2、解释括号中的表达式#u，其结果是user对象
?? * 3、把括号中表达式的结果作为root对象，解释在第一步中得到的结果（即把第一步的结果看成另外一个表达式）
?? */
??String value = (String)Ognl.getValue("#fact(#u)", context, root);
??System.out.println(value);
?}
?
?public void testOgnl_18() throws Exception{
??Person person = new Person();
??Map context = new HashMap();
??User u = new User();
??u.setUsername("暗之幻影");
??context.put("u", u);
??
??/**
?? * 相当于调用person这个根对象的fact方法，并把#u的解释结果作为参数传入此方法
?? */
??String value = (String)Ognl.getValue("fact(#u)", context, person);
??System.out.println(value); //输出是 "暗之幻影,"
?}
?
?public void testOgnl_19() throws Exception{
??Person person = new Person();
??Map context = new HashMap();
??User u = new User();
??u.setUsername("暗之幻影");
??context.put("u", u);
??
??/**
?? * 1、先计算表达式fact，得到结果是：username
?? * 2、解释括号中的表达式#u，其结果是user对象
?? * 3、把括号中表达式的结果作为root对象，解释在第一步中得到的结果（即把第一步的结果看成另外一个表达式）
?? */
??String value = (String)Ognl.getValue("(fact)(#u)", context, person);
??System.out.println(value); //输出"暗之幻影"
?}
?
?// ********************* OGNL访问集合元素 **************************//
?public void testOgnl_20() throws Exception{
??Object root = new Object();
??Map context = new HashMap();
??
??//用OGNL创建List对象
??List listvalue = (List)Ognl.getValue("{123,'暗之幻影','风之水影'}", context, root);
??context.put("listvalue", listvalue);
??
??//用OGNL创建数组
??int[] intarray= (int[])Ognl.getValue("new int[]{23,45,67}", context, root);
??context.put("intarray", intarray);
??
??//用OGNL创建Map对象
??Map mapvalue = (Map)Ognl.getValue("#{'listvalue':#listvalue,'intarray':#intarray}", context, root);
??context.put("mapvalue", mapvalue);
??
??Ognl.getValue("@System@out.println(#listvalue[0])", context, root);
??Ognl.getValue("@System@out.println(#intarray[1])", context, root);
??Ognl.getValue("@System@out.println(#mapvalue['intarray'][2])", context, root);
??Ognl.getValue("@System@out.println(#mapvalue.intarray[0])", context, root);
?}
}
