详解如何在Spring Boot项目使用参数校验

<dependency>  <groupId>org.hibernate</groupId>  <artifactId>hibernate-validator</artifactId>  <version>5.3.1.Final</version></dependency>

@Configuration@EnableAutoConfigurationpublic class FactoryConfig {    final static Logger logger= LoggerFactory.getLogger(FactoryConfig.class);   @Bean  public MethodValidationPostProcessor methodValidationPostProcessor(){   return new MethodValidationPostProcessor();  }    }

@AssertFalse 校验false@AssertTrue 校验true@DecimalMax(value=,inclusive=) 小于等于value，inclusive=true,是小于等于@DecimalMin(value=,inclusive=) 与上类似@Max(value=) 小于等于value@Min(value=) 大于等于value@NotNull 检查Null@Past 检查日期@Pattern(regex=,flag=) 正则@Size(min=, max=) 字符串，集合，map限制大小@Valid 对po实体类进行校验

package hello;import javax.validation.constraints.Min;import javax.validation.constraints.NotNull;import javax.validation.constraints.Size;public class PersonForm {  //名字不能为空，而且长度必须在2和30之间  @NotNull(message = "名称不能为空")  @Size(min=2, max=30, message = "名字长度必须在2和30之间")  private String name;    //年龄不能为空，而且必须大于等于18岁  @NotNull  @Min(18)  private Integer age;  public String getName() {    return this.name;  }  public void setName(String name) {    this.name = name;  }  public Integer getAge() {    return age;  }  public void setAge(Integer age) {    this.age = age;  }  public String toString() {    return "Person(Name: " + this.name + ", Age: " + this.age + ")";  }}

//非实体类参数可以直接使用注解 @GetMapping("/check")@ResponseBodypublic String check(@Min(0,message = "kpId必须大于等于0") @RequestParam int kpId,@RequestParam int level) {    return "ok";}  //实体类注解校验使用@Valid  @PostMapping("/")  public String checkPersonInfo(@Valid PersonForm personForm, BindingResult bindingResult) {    if (bindingResult.hasErrors()) {      return "form";    }    return "redirect:/results";  }

<td th:if="${#fields.hasErrors('age')}" th:errors="*{age}">Age Error</td>