javax.validation.constraints_JAVA_编程开发_程序员俱乐部

javax.validation.constraints

支持的写法


1 库

class="java" name="code">
 <dependency>
      <groupId>javax.validation</groupId>
      <artifactId>validation-api</artifactId>
      <version>1.1.0.Final</version>
    </dependency>

2 校验字段上添加校验注解

class Profile{
        @NotNull(message = "字段值不能为空")
        private String name;
        @NotNull
        private String sex;
        @Max(value = 20,message = "最大长度为20")
        private String address;
        @NotNull
        @Size(max=10,min=5,message = "字段长度要在5-10之间")
        private String fileName;
        @Pattern(regexp = "^[a-zA-Z0-9_.-]+@[a-zA-Z0-9-]+(\\.[a-zA-Z0-9-]+)*\\.[a-zA-Z0-9]{2,6}$",message = "不满足邮箱正则表达式")
        private String email;
        @AssertTrue(message = "字段为true才能通过")
        private boolean isSave;
        @Future(message = "时间在当前时间之后才可以通过")
        private Date date;

        @Future(message = "生日必须在当前实践之前")
        private Date birthday;

        @Pattern(regexp = "^(.+)@(.+)$",message = "邮箱的格式不合法")
        private String email;

        @Size(min = 6,max = 30,message = "地址应该在6-30字符之间")
        private String address;

        @DecimalMax(value = "100.00",message = "体重有些超标哦")
        @DecimalMin(value = "60.00",message = "多吃点饭吧")
        private BigDecimal weight;

}

3 在Controller层使用@Validated进行验证

@RequestMapping("file/upload")
 public void upload(@RequestPart("files") MultipartFile files, @Validated Profile profile, Errors error) throws IOException {
       if(error.hasErrors()){
           return;
       }
       files.transferTo(new File(files.getOriginalFilename()));////保存文件
}

4 自定义bean validation 注解验证 https://www.cnblogs.com/xiaogangfan/p/5987659.html



optional参考
https://www.runoob.com/java/java8-optional-class.html


java 中
try catch  当抛出异常的时候 性能大幅下降,没事少用.

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