// ***************** root对象的概念 ******************* //
public void testOgnl_01() throws Exception{
User user = new User();
user.setUsername("张三");
//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("张三");
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("张三");
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("张三");
p2.setName("李四");
Map context = new HashMap();
context.put("p1", p1);
context.put("p2", p2);
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("张三");
p2.setName("李四");
Map context = new HashMap();
context.put("p1", p1);
context.put("p2", p2);
User root = new User();
root.setUsername("zhangsan");
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, "zhangsan");
System.out.println(user.getUsername());
}
public void testOgnl_07() throws Exception{
User user = new User();
Map context = new HashMap();
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(), "zhangsan");
System.out.println(user.getUsername());
}
public void testOgnl_08() throws Exception{
User user = new User();
Map context = new HashMap();
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 = '张三'",context, new Object());
System.out.println(user.getUsername());
}
public void testOgnl_09() throws Exception{
User user = new User();
Person p = new Person();
Map context = new HashMap();
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 = '张三',#p.name = '李四'",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("张三");
String value = (String)Ognl.getValue("getUsername()", user);
System.out.println(value);
}
public void testOgnl_11() throws Exception{
User user = new User();
Ognl.getValue("setUsername('张三')", user);
System.out.println(user.getUsername());
}
// ********************* 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("@[email protected](#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('ZHANGSAN')", user);
Ognl.getValue("@[email protected](#this.username)", user);
}
public void testOgnl_16() throws Exception{
User user = new User();
Ognl.getValue("setUsername('ZHANGSAN')", user);
Ognl.getValue("@[email protected](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("张三");
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("张三");
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 "张三,"
}
public void testOgnl_19() throws Exception{
Person person = new Person();
Map context = new HashMap();
User u = new User();
u.setUsername("张三");
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"张三"
}
// ********************* 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,'kdjfk','oooo'}", 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("@[email protected](#listvalue[0])", context, root);
Ognl.getValue("@[email protected](#intarray[1])", context, root);
Ognl.getValue("@[email protected](#mapvalue['intarray'][2])", context, root);
Ognl.getValue("@[email protected](#mapvalue.intarray[0])", context, root);
}
