ongl备忘

// ***************** 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);
}

    // ***************** 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);
    }

// *********************** 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());
}

    // ******************* 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());
}

//****************** 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);
}

    // ********************* 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"
}

    // ******************* 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);
}