JAVA反射机制的应用

这是通过java的反射机制可以避免重复的写相似的调用方法

1. // 通过反射方法set数据
2.                 for (int i = 0; i < GRADE_NUM; i++) {
3.                     method1 = GetValueMethod.setMethod(new FR0313Dto(),
4.                             "minorityStuNum" + (i + 1),
5.                             new Class[] { String.class });
6.                     method2 = GetValueMethod.setMethod(new FR0313Dto(),
7.                             "girlStuNum" + (i + 1),
8.                             new Class[] { String.class });
9.                     method3 = GetValueMethod.setMethod(new FR0313Dto(),
10.                             "stuNum" + (i + 1), new Class[] { String.class });
11.                     try {
12.                         method1.invoke(dto, new Object[] { String
13.                                 .valueOf(minorityStuNum) });
14.                         method2.invoke(dto, new Object[] { String
15.                                 .valueOf(getIntValue(acadGirlMap
16.                                         .get(gradeAcadyear[i]))) });
17.                         method3.invoke(dto, new Object[] { String
18.                                 .valueOf(getIntValue(acadStuMap
19.                                         .get(gradeAcadyear[i]))) });
20.                     } catch (IllegalArgumentException e) {
21.                         log.error(e);
22.                     } catch (IllegalAccessException e) {
23.                         log.error(e);
24.                     } catch (InvocationTargetException e) {
25.                         log.error(e);
26.                     }
27.                 }

下面是拼装set方法，GetValueMethod中的setMethod

1.  public static Method setMethod(Object object, String propertyName,
2.                 Class[] partypes) {
3.          if (propertyName == null || propertyName.length() == 0) {
4.                 return null;
5.             }
6.          String propertyNameUpper = propertyName.substring(0, 1).toUpperCase()
7.             + propertyName.substring(1);
8.          
9.          String methodName = "set" + propertyNameUpper;
10.             Method method = null;
11.             try {
12.                 method = object.getClass().getMethod(methodName, partypes);
13.             } catch (SecurityException e) {
14.                 e.printStackTrace();
15.             } catch (NoSuchMethodException e) {
16.                 e.printStackTrace();
17.             }
18.             return method;
19.      }