HuTool工具的使用
1、类型转换
@ApiOperation("Convert使用：类型转换工具类")
@GetMapping(value = "/covert")
public CommonResult covert() {
//转换成字符串
int a = 1;
String aStr = Convert.toStr(a);
//转换为指定类型数组
String[] b = {"1","2","3","4"};
Integer[] bArr = Convert.toIntArray(b);
//转换成日期对象
String dateStr = "2017-07-22";
Date date = Convert.toDate(dateStr);
//转换成列表
String[] strArr = {"a","b","c","d"};
List<String> strList = Convert.toList(String.class, strArr);
return CommonResult.success(null,"操作成功");
}2、日期时间
@ApiOperation("DateUtil使用：日期时间工具")
@GetMapping("/dateUtil")
public CommonResult dateUtil(){
//Date、long、Calendar之间的转换
//当前时间
Date date = DateUtil.date();
//Calendar转Date
date = DateUtil.date(Calendar.getInstance());
//时间戳转Date
date = DateUtil.date(System.currentTimeMillis());
//自动识别格式转换
String dateStr = "2012-12-21";
date = DateUtil.parse(dateStr);
//自定义格式转换
DateUtil.parse(dateStr,"yyyy-MM-dd");
//格式化输出日期
String format = DateUtil.format(date,"yyyy-MM-dd");
//获取年的部分
int year = DateUtil.year(date);
//获取月份，从0开始。
int month = DateUtil.month(date);
//获取某天的开始时间 2012-12-21 23:59:59
Date beginOfDay = DateUtil.beginOfDay(date);
//获取某天的结束时间 2012-12-21 00:00:00
Date endOfDay = DateUtil.endOfDay(date);
//计算偏移后的日期
Date newDate = DateUtil.offset(date, DateField.DAY_OF_MONTH, 2);
//计算日期中间的偏移量
long betweenDay = DateUtil.between(date, newDate, DateUnit.DAY);//2天
return CommonResult.success(null,"操作成功！");
}3、字符串
@ApiOperation("StrUtil使用：字符串工具")
@GetMapping("/strUtil")
public CommonResult strUtil(){
//判断是否为空字符串？(null或者’‘都认定为空字符串)
String str = null;
StrUtil.isNotBlank(str);
StrUtil.isBlank(str);
//去除字符串的前后缀
StrUtil.removeSuffix("a.jpg",".jpg");
StrUtil.removePrefix("a.jpg","a.") ;
//格式化字符串
String template = "这只是一个占位符：{}";
String str2 = StrUtil.format(template,"我是占位符");
LOGGER.info("/strUtil format:{}",str2);
return CommonResult.success(null,"操作成功！");
}4、读取Resource下文件
@ApiOperation("ClassPath单一资源访问类：在classpath下查找文件")
@GetMapping("/classPath")
public CommonResult classPath() throws IOException {
//获取定义在src/main/resources文件夹中的配置文件
ClassPathResource resource = new ClassPathResource("generator.properties");
Properties prop = new Properties();
prop.load(resource.getStream());
LOGGER.info("/classpath:{}",prop);
return CommonResult.success(null,"操作成功！");
}5、反射工具类
@ApiOperation("ReflectUtil使用：JAVA反射工具类")
@GetMapping("/reflectUtil")
public CommonResult reflectUtil(){
//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");
//通过反射来创建对象
PmsBrand pmsBrand = ReflectUtil.newInstance(PmsBrand.class);
//反射执行对象的方法
ReflectUtil.invoke(pmsBrand,"setId",1);
return CommonResult.success(null,"操作成功！");
}6、Bean相关
@ApiOperation("BeanUtil使用，JavaBean的工具类")
@GetMapping("/beanUtil")
public CommonResult beanUtil(){
PmsBrand brand = new PmsBrand();
brand.setId(1L);
brand.setName("小米");
brand.setShowStatus(0);
//Bean转Map
Map<String, Object> mapBread = BeanUtil.beanToMap(brand);
LOGGER.info("beanUtil map to bean:{}",mapBread);
//Bean属性拷贝
PmsBrand copyBrand = new PmsBrand();
BeanUtils.copyProperties(brand,copyBrand);
LOGGER.info("beanUtil copy properties:{}",copyBrand);
return CommonResult.success(null,"操作成功！");
}7、Map相关
@GetMapping("/mapUtil")
public CommonResult mapUtil(){
//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);
return CommonResult.success(null,"操作成功！");
}8、注解工具
@ApiOperation("AnnotationUtil使用：注解工具类")
@GetMapping("/annotationUtil")
public CommonResult annotationUtil(){
//获取指定类、方法、字段、构造器上的注解列表
Annotation[] annotations = AnnotationUtil.getAnnotations(HutoolController.class, false);
LOGGER.info("annotationUtil annotations:{} ",annotations[1]);
//获取指定类型的注解
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);
LOGGER.info("annotationUtil annotationValue:{} ",annotationValue);
return CommonResult.success(null,"操作成功！");
}9、JSON解析
@ApiOperation("JSONUtil使用:JSON解析工具类")
@GetMapping("/jsonUtil")
public CommonResult jsonUtil(){
PmsBrand brand = new PmsBrand();
brand.setId(1L);
brand.setName("小米");
brand.setShowStatus(1);
//对象转换为JSON字符串
String jsonStr = JSONUtil.parse(brand).toString();
LOGGER.info("jsonUtil parse:{}",jsonStr);
//JSON字符串转化为对象
PmsBrand pmsBrand = JSONUtil.toBean(jsonStr, PmsBrand.class);
LOGGER.info("jsonUtil toBean:{}",pmsBrand);
List<PmsBrand> brandList = new ArrayList<>();
brandList.add(pmsBrand);
String jsonListStr = JSONUtil.parse(brandList).toString();
//JSON字符串转换为列表
List<PmsBrand> pmsBrandList = JSONUtil.toList(new JSONArray(jsonListStr), PmsBrand.class);
LOGGER.info("jsonUtil toList:{}",pmsBrandList);
return CommonResult.success(null,"操作成功！");
}10、验证码
@ApiOperation("CaptchaUtil使用：图形验证码")
@GetMapping("/captchaUtil")
public void captchaUtil(HttpServletRequest request, HttpServletResponse response) {
//生成验证码图片
CircleCaptcha lineCaptcha = CaptchaUtil.createCircleCaptcha(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();
}
}11、字段校验
@ApiOperation("Validator使用:字段验证器")
@GetMapping("/validator")
public CommonResult validator(){
//判断是否为邮箱地址
boolean result = Validator.isEmail("wangnaixing@qq.com");
LOGGER.info("Validator isEmail:{}",result);
//判断是否为手机号码
result = Validator.isMobile("18154622909");
LOGGER.info("Validator isMobile:{}",result);
//判断是否为IPV4地址
result = Validator.isIpv4("192.168.3.101");
LOGGER.info("Validator isIpv4:{}",result);
//判断是否为汉字
result = Validator.isChinese("你好");
LOGGER.info("Validator isChinese:{}",result);
//判断是否为身份证号（18位中国）
result = Validator.isCitizenId("123456");
LOGGER.info("Validator isCitizenId:{}",result);
//判断是否为URL
result = Validator.isUrl("http://www.baidu.com");
LOGGER.info("Validator isUrl:{}",result);
//判断是否为生日
result = Validator.isBirthday("2020-12-14");
LOGGER.info("Validator isBirthday:{}",result);
return CommonResult.success(null,"操作成功！");
}12、密码加密
@ApiOperation("DigestUtil使用：摘要算法工具类")
@GetMapping("/digestUtil")
public CommonResult digestUtil(){
String password = "123456";
//计算MD5摘要值，并转为16进制字符串
String result = DigestUtil.md5Hex(password);
LOGGER.info("digestUtil md5Hex:{}",result);
//计算SHA-256摘要值，并转为16进制字符串
result = DigestUtil.sha256Hex(password);
LOGGER.info("digestUtil sha256Hex:{}",result);
//生成Bcrypt加密后的密文，并检验。
String hashPwd = DigestUtil.bcrypt(password);
boolean check = DigestUtil.bcryptCheck(password, hashPwd);
LOGGER.info("digestUtil bcryptCheck:{}",check);
return CommonResult.success(null,"操作成功！");
}13、HTTP请求发送
@ApiOperation("HttpUtil使用：Http请求工具类")
@GetMapping("/httpUtil")
public CommonResult httpUtil(){
String response = HttpUtil.get("http://localhost:8080/hutool/covert");
LOGGER.info("HttpUtil get:{}", response);
return CommonResult.success(null, "操作成功");
}
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