根据注解修改属性的值
package reflectTest; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Retention(RetentionPolicy.RUNTIME) @Target({ ElementType.FIELD }) public @interface zk { String value() default ""; }
package reflectTest; public class Dog { @zk("name") private final String name; private final int sex; private final int weight; private final String type; public Dog(String name, int sex, int weight, String type) { this.name = name; this.sex = sex; this.weight = weight; this.type = type; } public String getName() { return name; } public int getSex() { return sex; } public int getWeight() { return weight; } public String getType() { return type; } @Override public String toString() { return "{\"name\":\"" + name + "\",\"sex\":\"" + sex + "\",\"weight\":\"" + weight + "\",\"type\":\"" + type + "\"} "; } }
package reflectTest; import java.lang.reflect.Field; public class RunZk { public static void main(String[] args) throws Exception { String key = "name"; String chgValue = "xxxxxx"; // 性别: 0:母, 1:公 Dog dog = new Dog("点点", 0, 25, "哈士奇"); System.out.println(dog.toString()); Class<? extends Dog> clazz = dog.getClass();// 获取到对象对应的class对象 Field[] fields = clazz.getDeclaredFields();// for (Field f : fields) { if (f.isAnnotationPresent(zk.class)) { zk anno = f.getAnnotation(zk.class); if (anno.value().equals(key)) { System.out.println(f.getName()); Field nameField = clazz.getDeclaredField(f.getName());// 获取私有成员变量:name nameField.setAccessible(true);// 设置操作权限为true nameField.set(dog, chgValue); } } } System.out.println(dog.toString()); } }