一个超神级框架​——Hutool工具类​应有尽有！

//获取定义在src/main/resources文件夹中的配置文件
ClassPathResource resource = new ClassPathResource("generator.properties");
Properties properties = new Properties();
properties.load(resource.getStream());
LOGGER.info("/classPath:{}", properties);

//获取某个类的所有方法
Method[] methods = ReflectUtil.getMethods(PmsBrand.class);
//获取某个类的指定方法
Method method = ReflectUtil.getMethod(PmsBrand.class, "getId");
//使用反射来创建对象
PmsBrand pmsBrand = ReflectUtil.newInstance(PmsBrand.class);
//反射执行对象的方法
ReflectUtil.invoke(pmsBrand, "setId", 1);

double n1 = 1.234;
double n2 = 1.234;
double result;
//对float、double、BigDecimal做加减乘除操作
result = NumberUtil.add(n1, n2);
result = NumberUtil.sub(n1, n2);
result = NumberUtil.mul(n1, n2);
result = NumberUtil.div(n1, n2);
//保留两位小数
BigDecimal roundNum = NumberUtil.round(n1, 2);
String n3 = "1.234";
//判断是否为数字、整数、浮点数
NumberUtil.isNumber(n3);
NumberUtil.isInteger(n3);
NumberUtil.isDouble(n3);

PmsBrand brand = new PmsBrand();
brand.setId(1L);
brand.setName("小米");
brand.setShowStatus(0);
//Bean转Map
Map<String, Object> map = BeanUtil.beanToMap(brand);
LOGGER.info("beanUtil bean to map:{}", map);
//Map转Bean
PmsBrand mapBrand = BeanUtil.mapToBean(map, PmsBrand.class, false);
LOGGER.info("beanUtil map to bean:{}", mapBrand);
//Bean属性拷贝
PmsBrand copyBrand = new PmsBrand();
BeanUtil.copyProperties(brand, copyBrand);
LOGGER.info("beanUtil copy properties:{}", copyBrand);

//数组转换为列表
String[] array = new String[]{"a", "b", "c", "d", "e"};
List<String> list = CollUtil.newArrayList(array);
//join：数组转字符串时添加连接符号
String joinStr = CollUtil.join(list, ",");
LOGGER.info("collUtil join:{}", joinStr);
//将以连接符号分隔的字符串再转换为列表
List<String> splitList = StrUtil.split(joinStr, ',');
LOGGER.info("collUtil split:{}", splitList);
//创建新的Map、Set、List
HashMap<Object, Object> newMap = CollUtil.newHashMap();
HashSet<Object> newHashSet = CollUtil.newHashSet();
ArrayList<Object> newList = CollUtil.newArrayList();
//判断列表是否为空
CollUtil.isEmpty(list);

> //将多个键值对加入到Map中 Map<Object, Object> map = MapUtil.of(new String[][]{
>     {"key1", "value1"},
>     {"key2", "value2"},
>     {"key3", "value3"} }); //判断Map是否为空 MapUtil.isEmpty(map); MapUtil.isNotEmpty(map);

//获取指定类、方法、字段、构造器上的注解列表
Annotation[] annotationList = AnnotationUtil.getAnnotations(HutoolController.class, false);
LOGGER.info("annotationUtil annotations:{}", annotationList);
//获取指定类型注解
Api api = AnnotationUtil.getAnnotation(HutoolController.class, Api.class);
LOGGER.info("annotationUtil api value:{}", api.description());
//获取指定类型注解的值
Object annotationValue = AnnotationUtil.getAnnotationValue(HutoolController.class, RequestMapping.class);

//MD5加密
String str = "123456";
String md5Str = SecureUtil.md5(str);
LOGGER.info("secureUtil md5:{}", md5Str);

//生成验证码图片
LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(200, 100);
try {
    request.getSession().setAttribute("CAPTCHA_KEY", lineCaptcha.getCode());
    response.setContentType("image/png");//告诉浏览器输出内容为图片
    response.setHeader("Pragma", "No-cache");//禁止浏览器缓存
    response.setHeader("Cache-Control", "no-cache");
    response.setDateHeader("Expire", 0);
    lineCaptcha.write(response.getOutputStream());
} catch (IOException e) {
    e.printStackTrace();
}