SpringMVC 數據校驗

1.引入jar包

2.配置驗證器

   <!-- 配置驗證器 -->
       <bean id="myvalidator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
           <property name="providerClass" value="org.hibernate.validator.HibernateValidator"></property>
       </bean> 
       
       <mvc:annotation-driven validator="myvalidator"/>

3.建立實體

package cn.happy.entity;

import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;

import org.hibernate.validator.constraints.NotEmpty;
import org.jboss.logging.Message;



public class UserInfo {
    
     //必須是0到100之間
    @NotNull(message="成績不能爲空")
    @Min(value=0,message="成績最小值爲{value}")
    @Max(value=100,message="成績最大值爲{value}")
    private Integer score;
    
   //手機號碼必須不能爲空,必須是以1 開頭 第二位3,4,5,6,7,8,9   最後9位隨意
    @NotEmpty(message="手機號碼不容許爲空")  
    @Pattern(regexp="^1[3,4,5,6,7,8,9]\\d{9}$",message="手機號碼不正確")
  private String phone;
    
    //不能爲空
    //必須是6個字符以上
     @NotEmpty(message="用戶名不能爲空") 
    @Size(min=6,message="名稱至少6個字符")
  private String name;
  
    public Integer getScore() {
        return score;
    }
    public void setScore(Integer score) {
        this.score = score;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
  
  
}

4.編寫handler

package cn.happy.controller;

import javax.validation.Valid;

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.servlet.ModelAndView;

import cn.happy.entity.UserInfo;

@Controller
public class FirstController {
    @RequestMapping("/first.do")
    public ModelAndView doFirst(@Valid UserInfo info,BindingResult br){
        ModelAndView mv=new ModelAndView();
        mv.setViewName("/WELCOME.jsp");
        //記錄究竟是哪一個字段驗證失敗了
        //有一個能夠偵測到驗證錯誤總數的方法
        int errorCount = br.getErrorCount();
        if (errorCount>0) {
            //證實模型驗證失敗
            FieldError score = br.getFieldError("score");
            FieldError name = br.getFieldError("name");
            FieldError phone = br.getFieldError("phone");
            if (score!=null) {
                mv.addObject("scoremsg",score.getDefaultMessage());
            }
            
            if (name!=null) {
                mv.addObject("namemsg",name.getDefaultMessage());
            }
            
            if (phone!=null) {
                mv.addObject("phonemsg",phone.getDefaultMessage());
            }
            mv.setViewName("/index.jsp");
        }
    
        return mv ;
    }
}