java 使用反射动态赋值

在开发数据解析的功能时,会有将目标数据解析到多个字段中的场景,比如将以下的数据解析入库:

public class UserTo implements Serializable {
    private static final Long serialVersionUID = 1L;
    private String name;
    private String age;
    private String score;
}

String str = "name:zhangsan,age:30,score:100";

常规做法是

user.setAge(str.split(",")[0].split(":")[1]);
user.setName(str.split(",")[1].split(":")[1]);
user.setScore(str.split(",")[2].split(":")[1]);

当字段较多或者字段变更比较频繁的时候,可以使用反射获取实体属性,动态赋值:

public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchFieldException {
        String str = "name:zhangsan,age:30,score:100";
        Class c1 = Class.forName("com.model.UserTo");
        UserTo user = (UserTo) c1.newInstance();
        String[] arr = str.split(",");
        for(String arrStr : arr){
            Field item = c1.getDeclaredField(arrStr.split(":")[0]);
            item.setAccessible(true);
            item.set(user,arrStr.split(":")[1]);
        }
        System.out.println(JSON.toJSONString(user));
    }

这样做的好处:

2.代码简洁,容易维护

缺点:

1.字段如果有二次加工不太方便