bean和map互转

//自定义注解

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER})
public @interface FieldName {
    /**     * 字段名     */
     String value() default "";
    /**
      * 是否忽略
     */
    boolean Ignore() default false;
}

//map转 bean
public static <T> T map2Bean(Map<String, Object> source, Class<T> instance) {
    try {
        T object = instance.newInstance();
        Field[] fields = object.getClass().getDeclaredFields();
        for (Field field : fields) {
            field.setAccessible(true);
            FieldName fieldName = field.getAnnotation(FieldName.class);
            if (fieldName != null) {
                field.set(object, source.get(fieldName.value()));
            } else {
                field.set(object, source.get(field.getName()));
            }
        }
        return object;
    } catch (InstantiationException | IllegalAccessException e) {
        e.printStackTrace();
    }
    return null;
}　　
//bean转map

public static <T> Map bean2Map(T source) throws IllegalAccessException {
    Map<Object, Object> result = new Properties();
        Class<?> sourceClass = source.getClass();
        //拿到所有的字段,不包括继承的字段
       Field[] sourceFiled = sourceClass.getDeclaredFields();
        for (Field field : sourceFiled) {
              field.setAccessible(true);//设置可访问,不然拿不到private
              //配置了注解的话则使用注解名称,作为header字段
              FieldName fieldName = field.getAnnotation(FieldName.class);
              if (fieldName == null) {
                  if (field.get(source)!=null)
                    result.put(field.getName(), field.get(source));
              } else {
                if (fieldName.Ignore()) continue;
                result.put(fieldName.value(), field.get(source));
              }
            }
        return result;
      }