編寫需要校驗(yàn)的model

import lombok.Data;

import javax.validation.constraints.Max;
import javax.validation.constraints.Min;

@Data
public class SchoolDto {

    @Min(value = 1, message = "page最小值為1")
    @Max(value = Integer.MAX_VALUE, message = "page過大")
    private Integer page = PageConstant.DEFAULT_PAGE;

    @Min(value = 1, message = "pageSize最小值為1")
    @Max(value = Integer.MAX_VALUE, message = "pageSize過大")
    private Integer pageSize = PageConstant.DEFAULT_PAGE_SIZE;
}

Controller中對(duì)參數(shù)的校驗(yàn)

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;

@RestController
@RequestMapping("/school")
public class SchoolController {

    @Autowired
    private SchoolService schoolService;

    @RequestMapping("/list")
    @ResponseBody
    public Result list(@Valid SchoolDto schoolDto, BindingResult bindingResult) {
        if (bindingResult.hasErrors()) {
            return Result.error(ResultEnum.PARAMS_ERROR.getCode(), ValidUtil.getAllErrorMessage(bindingResult));
        }

        return Result.success(schoolService.list(schoolDto));
    }
}

注意

用 @Valid 注解的參數(shù)后必須緊挨著一個(gè) BindingResult 參數(shù)烫堤，否則 Spring 會(huì)在校驗(yàn)不通過時(shí)直接拋出異常

用到的工具方法

Controller 返回給客戶端的 JSON 對(duì)象

import lombok.Data;

@Data
public class Result {

    private Integer code;
    private String msg;
    private Object data;

    public static Result success() {
        return success(null);
    }

    public static Result success(Object obj) {
        Result result = new Result();
        result.setCode(ResultEnum.SUCCESS.getCode());
        result.setMsg(ResultEnum.SUCCESS.getMsg());
        result.setData(obj);
        return result;
    }

    public static Result error(Integer code, String msg) {
        Result result = new Result();
        result.setCode(code);
        result.setMsg(msg);
        return result;
    }
}

得到參數(shù)校驗(yàn)的錯(cuò)誤信息

import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;

public class ValidUtil {

    public static String getAllErrorMessage(BindingResult bindingResult) {
        StringBuilder result = new StringBuilder();
        for (ObjectError error : bindingResult.getAllErrors()) {
            result.append(error.getDefaultMessage()).append(";");
        }
        return result.toString();
    }
}