[Java知识库]后端校验工具validation的使用

使用这个工具可以在后端完成对参数的校验以及响应

<javax.validation.version>2.0.0.Final</javax.validation.version>
<dependency>
   <groupId>javax.validation</groupId>
   <artifactId>validation-api</artifactId>
   <version>${javax.validation.version}</version>
</dependency>

然后在你的前端来参的dto中进行如下配置

@Data
public class LoginDto {

    @NotBlank(message = "账号必须填写")
    @Length(min = 8, max = 32, message = "限制8-32位字符")
    private String username;
    @NotBlank(message = "密码不能为空或者空格")
    @Pattern(regexp = "[A-Za-z0-9]+", message = "必须由数字和字母组成")
    @Length(min = 8, max = 32, message = "长度限制8-32位字符")
    private String password;
}

接口参数前加上注解@Valid

 @PostMapping("login")
 public String login(@RequestBody @Valid LoginDto loginDto){
     System.out.println(loginDto);
     return "SUCCESS";
 }

字符串的规则校验：

@PostMapping("/soutaaa")
public String soutaaa(@RequestBody String aaa){
    String regex="^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z]{6,18}$";
    String str="执行成功！";
    if(!aaa.matches(regex))
        str="格式错误！";
    return str;
}