SpringBoot 实战 (十五) | 服务端参数校验之一

@RestController
@RequestMapping("/student")
public class ValidateOneController {
    @GetMapping("/id")
    public Student findStudentById(Integer id){
        if(id == null){
              logger.error("id 不能为空！")；
              throw new NullPointerException("id 不能为空");
        }
        return studentService.findStudentById(id);
    }
}

<!-- web 启动类 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- test 单元测试类 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>
<!-- lombok 依赖用于简化 bean -->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student {
    private Integer id;
    @NotBlank(message = "学生名字不能为空")
    @Length(min = 2, max = 10, message = "name 长度必须在 {min} - {max} 之间")
    private String name;
    @NotNull(message = "年龄不允许为空")
    @Min(value = 0, message = "年龄不能低于 {value} 岁")
    private Integer age;
}

@Validated //开启数据校验，添加在类上用于校验方法，添加在方法参数中用于校验参数对象。(添加在方法上无效)
@RestController
@RequestMapping("/student")
public class ValidateOneController {
    /**
     * 普通参数校验
     * @param name
     * @return
     */
    @GetMapping("/name")
    public String findStudentByName(@NotBlank(message = "学生名字不能为空")
    @Length(min = 2, max = 10, message = "name 长度必须在 {min} - {max} 之间")String name){
        return "success";
    }
    /**
     * 对象校验
     * @param student
     * @return
     */
    @PostMapping("/add")
    public String addStudent(@Validated @RequestBody Student student){
        return "success";
    }
}