根据实体和字段得到字段的值采用类反射

场景: 根据不同条件值取不同的字段值

例如 :

Score  score= new Score();
switch (itemDetail.getEvaluationCode()) {
     case 1:
         score.getCostLevel()
         break;
     case 2:
         score.getScarcityLevel()
         break;
     case 3:
         // 计算数据完整性对应的系数
        score.getIntegrityLevel()
         break;
     }

使用反射的写法如下:

private static String getFieldValue(Score score,String youField ) throws NoSuchFieldException, IllegalAccessException {
    Class<? extends Score> clazz1 = score.getClass();
    Field field = clazz1.getDeclaredField(youField);//获取私有字段
    field.setAccessible(true);//设置权限
    return (String) field.get(score);
}

在加一个枚举

COST("COST","cost"),
private String key;
    private String value;
    private YouClassName(String key,String value){
        this.key = key;
        this.value = value;
    }

    public String getKey() {
        return key;
    }

    public String getValue() {
        return value;
    }

    public static String getValueByCode(String code){
        for (YouClassNameele : values()) {
            if(ele.getKey().equals(code)) return ele.getValue();
        }
        return null;
    }