OGNL介绍

 1 package com.xy.test;
 2 
 3 import ognl.OgnlContext;
 4 import ognl.OgnlException;
 5 
 6 public class Demo1 {
 7 
 8     /**
 9      * @param args
10      * @throws OgnlException
11      */
12     public static void main(String[] args)  {
13         Employee e = new Employee();
14         e.setName("小李");
15 
16         Manager m = new Manager();
17         m.setName("张经理");
18 
19         // 创建OGNL下文,而OGNL上下文实际上就是一个Map对象
20         OgnlContext ctx = new OgnlContext();
21 
22         // 将员工和经理放到OGNL上下文当中去
23         ctx.put("employee", e);
24         ctx.put("manager", m);
25         ctx.setRoot(e);// 设置OGNL上下文的根对象
26 
27         /** ********************** 取值操作 *************************** */
28         // 表达式name将执行e.getName()，因为e对象是根对象(请注意根对象和非根对象表达式的区别)
29         String employeeName = (String) OnglExpression.getValue("name", ctx, e);
30         System.out.println(employeeName);
31 
32         // 表达式#manager.name将执行m.getName()，注意：如果访问的不是根对象那么必须在前面加上一个名称空间，例如：#manager.name
33         String managerName = (String) OnglExpression.getValue("#manager.name",
34                 ctx, e);
35         System.out.println(managerName);
36 
37         // 当然根对象也可以使用#employee.name表达式进行访问
38         employeeName = (String) OnglExpression.getValue("#employee.name", ctx,
39                 e);
40         System.out.println(employeeName);
41 
42         /** ********************** 赋值操作 *************************** */
43         OnglExpression.setValue("name", ctx, e, "小明");
44         employeeName = (String) OnglExpression.getValue("name", ctx, e);
45         System.out.println(employeeName);
46 
47         OnglExpression.setValue("#manager.name", ctx, e, "孙经理");
48         managerName = (String) OnglExpression.getValue("#manager.name", ctx, e);
49         System.out.println(managerName);
50 
51         OnglExpression.setValue("#employee.name", ctx, e, "小芳");
52         employeeName = (String) OnglExpression.getValue("name", ctx, e);
53         System.out.println(employeeName);
54     }
55 
56 }

 1 private HttpServletRequest req;
 2     private Cal cal1=new Cal();
 3     private Cal cal2;
 4     private String sex;
 5     private String num1;
 6     
 7     
 8     public String getNum1() {
 9         return num1;
10     }
11 
12 
13     public void setNum1(String num1) {
14         this.num1 = num1;
15     }
16 
17 
18     public Cal getCal2() {
19         return cal2;
20     }
21 
22 
23     public void setCal2(Cal cal2) {
24         this.cal2 = cal2;
25     }
26 
27 
28     public String getSex() {
29         return sex;
30     }
31 
32 
33     public void setSex(String sex) {
34         this.sex = sex;
35     }
36     
37     /**
38      * implements ModelDriven
39      * @return
40      */
41     public String accept1() {
42         System.out.println("cal1："+cal1);
43         System.out.println("num1："+num1);
44         return "rs";
45     }