参数校验

转载 https://blog.csdn.net/hg2726028/article/details/78048502

• 1.Validator的jar包依赖

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>5.4.1.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator-annotation-processor</artifactId>
    <version>5.4.1.Final</version>
</dependency>
<dependency>
    <groupId>javax.validation</groupId>
    <artifactId>validation-api</artifactId>
    <version>2.0.0.Final</version>
</dependency>

• 2.一般在conroller层中用对象接受参数信息时，会对参数进行校验，为了简化代码，hibernate validator提供了基于注解方式的参数校验
  

• package com.user.vo;
  import com.alibaba.fastjson.JSON;
  import org.hibernate.validator.constraints.NotEmpty;
  /**
   * 注册对象实例类
   *
   * @author CaiWei
   * @version 1.0
   * @created 2017-09-12 23:44:26
   * @since 1.0
   **/
  public class RegisterUserBean {
  
      @NotEmpty(message = "用户名不可为空")
      private String userName;
  
      private String nickName;
  
      @NotEmpty(message = "密码不可为空")
      private String passWord;
  
      @NotEmpty(message = "确认密码不可为空")
      private String confirmPwd;
  
      private String sex;
  
      private String mobile;
   
  }
  

• 3.controller层加入@valid注解

package com.user;

import com.alibaba.fastjson.JSON;
import com.base.ResponseEntity;
import com.user.entity.UserEntity;
import com.user.service.IUserService;
import com.user.vo.RegisterUserBean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.validation.Valid;
import java.util.List;

/**
 * something to description this class
 *
 * @author CaiWei
 * @version 1.0
 * @created 2017-09-12 23:33:01
 * @since 1.0
 **/
@Controller
@RequestMapping(value = "/user/register")
public class UserRegisterController {

    private final Logger LOGGER = LoggerFactory.getLogger(UserRegisterController.class);

    @Autowired
    private IUserService userService;

    @RequestMapping(value = "/page")
    public String toRegisterPage() {
        return "/user/register";
    }

    @RequestMapping(value = "/save",method = RequestMethod.POST)
    public ResponseEntity registered(@Valid RegisterUserBean userBean, BindingResult bindingResult) {
        LOGGER.info("注册的对象为：{}", JSON.toJSONString(userBean));
        if (bindingResult.hasErrors()){
            List<FieldError> errors = bindingResult.getFieldErrors();
            for (FieldError error :errors){
                LOGGER.info(error.getDefaultMessage());
            }
            return new ResponseEntity().error(errors.get(0).getDefaultMessage());
        }
        boolean res = false;
        if (!"{}".equals(JSON.toJSONString(userBean))) {
            UserEntity usr = new UserEntity();
            usr.setUsername(userBean.getUserName());
            usr.setCreatetime(System.currentTimeMillis() / 1000);
            usr.setNickname(userBean.getNickName());
            usr.setMobile(userBean.getMobile());
            usr.setUsertype(0);
            usr.setPassword(userBean.getConfirmPwd());
            res = userService.save(usr);

        }
        return res ? new ResponseEntity().success() : new ResponseEntity().error();
    }

}