springboot 参数校验

https://reflectoring.io/bean-validation-with-spring-boot/

https://github.com/thombergs/code-examples/tree/master/spring-boot/validation

https://spring.io/guides/gs/validating-form-input/

https://www.jianshu.com/p/51e8d2702ca1

spring和hibernate提供了基本的校验，输入数据不能空，整数范围等等。这可以节约我们程序的判断。

例子代码 https://github.com/wengmingdong/wmdspringtest/tree/master/validationtest

基本步骤

    引入jar包

    给需要校验的参数注解

如果maven引入了springboot web就包含了校验的jar包了。独立的是(spring-boot-starter-validation)

   org.springframework.boot

    spring-boot-starter-web

创建controller类

普通参数校验

@RestController

@RequestMapping("/mytest/rest")

@Validated

public class MyRestParameterController {

// /mytest/rest/valid/blank?id=abc

    @RequestMapping(value ="/valid/blank", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)

public StringvalidationParameterBlank(@RequestParam(value ="id")@Valid @NotBlank String id) {

return "hello blank " + id;

    }

// /mytest/rest/valid/length?id=abc

    @RequestMapping(value ="/valid/length", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)

public StringvalidationParameterLength(@RequestParam(value ="id")@Valid @Size(min =3, max =5) String id) {

return "hello length " + id;

    }

}

对象bean校验

@RestController

@RequestMapping("/mytest/rest")

public class MyRestBeanController {

// /mytest/rest/valid/bean?userId=abc

    @RequestMapping(value ="/valid/bean", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)

public StringvalidationParameterBean(@RequestParam(value ="id2") String id2, @Valid ValidInst validInst) {

return "hello length " + validInst.getId() +";" + validInst.getName() +";" + id2;

    }

}

自定义校验

@RestController

@RequestMapping("/mytest/rest")

@Validated

public class MyRestCustomController {

// /mytest/rest/valid/custom?name=abc

    @RequestMapping(value ="/valid/custom", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)

public StringvalidationParameterCustom(@RequestParam(value ="name")@Valid @NameValid String name) {

return "hello custom " + name;

    }

}

自定义校验需要添加两个类

校验注解类

@Target({PARAMETER, FIELD })

@Retention(RUNTIME)

@Constraint(validatedBy = NameValidator.class)

@Documented

public @interface NameValid {

Stringmessage()default "名称不是abc";//"{name.invalid}";

    Class[]groups()default { };

    Class[]payload()default { };

}

校验类

public class NameValidator implements ConstraintValidator {

@Override

   public boolean isValid(String value, ConstraintValidatorContext context) {

if (!"abc".equalsIgnoreCase(value)) {

return false;

       }

return true;

   }

}

普通参数和对象参数校验配置差别是少一个@Validated注解

@RestController

@RequestMapping("/mytest/rest")

@Validated

public class MyRestParameterController {