为SpringBoot配置数据校验

开始

导入依赖

<dependency><!-- 用于数据校验 -->
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

DTO

实用javax.validation.constraints.Pattern注解可以直接用正则表达式进行验证。

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import javax.validation.constraints.Pattern;

@NoArgsConstructor
@AllArgsConstructor
@Data
public class UserDto {
    protected String username;
    @Pattern(regexp = "^(?=.*\\d)(?=.*[a-zA-Z])(?=.*[\\W_]).{6,24}$", message = "密码格式不正确")
    protected String password;
}

控制类

光配置参数接收类还不行，此时验证并没有生效，还需要在控制层的方法中加上为DTO参数加上javax.validation.Valid注解才能生效，案例代码如下：

@PostMapping
public Result login(@Valid @RequestBody UserDto userDto) {
    String token = userService.login(userDto.getUsername(), userDto.getPassword());
    return StringUtils.isNotBlank(token) ?
            Result.buildSuccess("登录成功！",token) :
            Result.buildFail("登录失败，用户名不存在或密码错误");
}

异常捕获

当数据验证失败，会抛出org.springframework.web.bind.MethodArgumentNotValidException异常。

如需要全局捕获异常可以使用AOP实现，拦截代理示例如下：

@ExceptionHandler(MethodArgumentNotValidException.class)
public Result sqlException(MethodArgumentNotValidException ex, HttpServletRequest request, HttpServletResponse response) {
    setHeader(request, response);

    return Result.buildFail("数据校验失败：" + ex.getBindingResult()
            .getAllErrors()
            .stream()
            .map(DefaultMessageSourceResolvable::getDefaultMessage)
            .collect(Collectors.joining(";")));
}

private void setHeader(HttpServletRequest request, HttpServletResponse response) {
    response.setHeader("Access-Control-Allow-Origin", request.getHeader("origin"));
    response.setHeader("Access-Control-Allow-Credentials", "true");
    response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT,PATCH, DELETE, OPTIONS");
    response.setHeader("Access-Control-Allow-Headers", "*");
}