java利用反射获取指定属性名的值或指定注解的值

深碍√TFBOYSˉ_ 2021-11-14 11:16 715阅读 0赞

1、直接贴出自写工具类代码

package com.myfutech.employee.service.provider.util;
    
    import com.myfutech.employee.service.api.vo.request.employee.EmployeeModifyVO;
    import com.myfutech.employee.service.provider.model.Employee;
    import com.myfutech.employee.service.provider.util.vo.IFieldResult;
    import io.swagger.annotations.ApiModelProperty;
    import org.apache.commons.lang3.StringUtils;
    import org.apache.commons.lang3.time.DateFormatUtils;
    import org.apache.commons.lang3.time.DateUtils;
    
    import java.lang.reflect.Field;
    import java.util.Date;
    
    /**
     * Created by Liuxd on 2019/7/31.
     */
    public class IBeanUtils {
    
        public static IFieldResult containFieldName(Object obj, String filedName, String filedValue) throws Exception {
            if (StringUtils.isBlank(filedName)) {
                return new IFieldResult(false);
            }
    
            boolean flag = false;
            String type = "";
            Object value = null;
    
            for (Field f : obj.getClass().getDeclaredFields()) {
                f.setAccessible(true);
    
                if (filedName.equals(f.getName())) {
                    flag = true;
                    type = f.getType().toString();
                    if (type.contains("Date")) {
                        if(!filedValue.contains(":")){
                            filedValue = filedValue + " 00:00:00";
                        }
                        value = DateUtils.parseDate(filedValue, "yyyy-MM-dd HH:mm:ss");
                    } else {
                        value = filedValue;
                    }
                    break;
                }
    
            }
    
            return new IFieldResult(flag, type, value);
        }
    
        public static String getFieldValueByFieldName(String fieldName, Object object) {
            try {
                Field field = object.getClass().getDeclaredField(fieldName);
                //设置对象的访问权限，保证对private的属性的访问
                field.setAccessible(true);
                Object hisValue = field.get(object);
                if (null == hisValue) {
                    return "";
                }
    
                String value = "";
                String type = field.getType().toString();
                if (type.contains("Date")) {
                    value = DateFormatUtils.format((Date) hisValue, "yyyy-MM-dd HH:mm:ss");
                } else {
                    value = hisValue.toString();
                }
    
                return value;
            } catch (Exception e) {
    
                return "";
            }
        }
    
        public static String getFieldTypeByFieldName(String fieldName, Object object) {
            try {
                Field field = object.getClass().getDeclaredField(fieldName);
                //设置对象的访问权限，保证对private的属性的访问
                field.setAccessible(true);
                String type = field.getType().toString();
                return type;
            } catch (Exception e) {
    
                return "";
            }
        }
    
        public static String getFieldAnnotation(String fieldName, Object object) {
            try {
                Field field = object.getClass().getDeclaredField(fieldName);
                //设置对象的访问权限，保证对private的属性的访问
                field.setAccessible(true);
                ApiModelProperty property = field.getAnnotation(ApiModelProperty.class);
                if (null == property) {
                    return "";
                }
    
                return property.value();
            } catch (Exception e) {
                return "";
            }
    
        }
    
        public static void main(String[] args) throws Exception {
            EmployeeModifyVO vo = new EmployeeModifyVO();
    
            IFieldResult result = IBeanUtils.containFieldName(vo, "employeeName", "99999");
    
            System.out.println(result.toString());
    
            vo.setEmployeeName("Jack");
    
            Object v = getFieldValueByFieldName("employeeName", vo);
    
            System.out.println(v);
    
            Employee employee = new  Employee();
    
            employee.setCreateTime(new Date());
    
            String v2 = getFieldValueByFieldName("createTime", employee);
    
            System.out.println(v2);
    
    
        }
    
    }