关于java:springboot-参数校验

1、场景

1）参数为实体类

web层须要对前端传输的数据做校验，如果依照上面的代码写，就太浪费时间了，并且代码看起来很乱。

public AjaxResult queryUserProjectContent(AppletProject appletProject){  if (appletProject.getId() == null) {    return AjaxResult.error("id为空");  }  if (appletProject.getContent() == null) {    return AjaxResult.error("内容为空");  }  if (appletProject.getTitle() == null) {    return AjaxResult.error("题目为空");  }  if (appletProject.getCoverImg() == null) {    return AjaxResult.error("首图为空");  }}

2）参数为单类型数据

public AjaxResult queryDownloadInfo(String outTradeNo){  if(outTradeNo == null) {    return AjaxResult.error("谬误");  }  Map<String, Object> map = microProjectService.queryDownloadInfo(outTradeNo);  return AjaxResult.success(map);}

2、改良

1）入参为实体类

引入pom

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

实体类加上注解

@Datapublic class ValidDemo {    @Size(min = 3, max = 12, message = "用户名必须的长度必须是3到12个字母之间")    @Pattern(regexp = "^[a-z]+$", message = "用户名必须是a-z小字母")    private String name;    @Size(min = 6, max = 6, message = "明码必须是6位数字")    @Pattern(regexp = "^[0-9]+$", message = "明码必须是6位数字")    private String password;    @Range(min = 1, max = 9, message = "范畴只能1到9")    private Integer range;    @NotNull(message = "邮箱不能为Null")    @Email(regexp = "(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])",            message = "邮箱格局有误")    private String email;}

web层入参前加上@Valid

@GetMapping("/validdemo")public Map<String,Object> demo(@Valid ValidDemo validDemo){    return ApiResultMap.successResult(validDemo);}

全局解决异样

@ExceptionHandler(value = { BindException.class })public Map<String, Object> validationException(BindException ex) {    log.error(ex.getBindingResult().getFieldError().getDefaultMessage());    return ApiResultMap.errorResult(ex.getBindingResult().getFieldError().getDefaultMessage());}

2）入参为单数据类型

配置 MethodValidationPostProcessor

@Beanpublic MethodValidationPostProcessor methodValidationPostProcessor() {  return new MethodValidationPostProcessor();}

web层加上注解

@Validated@RestControllerpublic class DemoController {}

办法上加上校验

@GetMapping("/validdemo3")public Map<String,Object> demo3(@NotNull String str, @NotNull @Range(min = 0, max = 10) Integer a){    return ApiResultMap.successResult(str + a);}

全局异样校验

/*** 参数校验报错异样*/@ExceptionHandler(ConstraintViolationException.class)public AjaxResult constraintViolationException(ConstraintViolationException e) {  String message = e.getMessage();  String substring = message.substring(message.indexOf(".") + 1);  return AjaxResult.error(substring.replace(": ", ""));}

参考https://www.jianshu.com/p/1ed...文章，如需更具体的内容，请拜访他的博客。

集体博客：https://www.51bishe.site