java反射用法

1、获取Class三种方式：

（1）通过class字符串：

Class entityClass = Class.forName("com.loan.back.entity.Article");

（2）通过对象获取：

Class entityClass1=entityObject.getClass();

（3）通过实体类获取

      Class  entityClass1=实体类.class;

2、根据类获取属性

Field[] f = entityClass.getDeclaredFields();

3、获取属性类型

for (Field field : f) {
System.out.println(field.getType().getName());
}

4、创建对象

Object entityObject=entityClass.newInstance();

5、给属性赋值

field.setAccessible(true);
field.set(entityObject, Long.parseLong("1"));

6、例子：通过className获取属性，与字典配置的属性以及对应到value进行匹配，赋值给对象，并返回

private Object getObjectFromClassName(String role, String code, String className)
			throws ClassNotFoundException, InstantiationException, IllegalAccessException {
		Class entityClass = Class.forName(className);
		Object entityObject = entityClass.newInstance();
		Dictionary dic = new Dictionary();
		dic.setCode(code);
		List<Dictionary> dicList = dictionaryService.find(dic);
		for (Dictionary dictionary : dicList) {
			String dicRole = dictionary.getName();
			if (dicRole.equals(role)) {
				String[] propList = dictionary.getDescription().split(",");
				String[] valueList = dictionary.getValue().split(",");
				if (propList.length == valueList.length) {
					Field[] f = entityClass.getDeclaredFields();
					for (Field field : f) {
						for (int i = 0; i < propList.length; i++) {
							if (field.getName().equals(propList[i])) {
								field.setAccessible(true);
								switch (field.getType().getName()) {
								case "java.lang.Long":
									field.set(entityObject, Long.parseLong(valueList[i]));
									break;
								case "java.lang.Integer":
									field.set(entityObject, Integer.parseInt(valueList[i]));
									break;
								case "java.lang.Boolean":
									if(valueList[i].equals("1")){
										field.set(entityObject, true);
									}
									else{
										field.set(entityObject, false);
									}
									break;
								default:
									field.set(entityObject, valueList[i]);
									break;
								}
							}
						}
					}
				}
			}
		}
		return entityObject;
	}