spring mvc验证器应用实例（超详细）-mile米乐体育

• 商品名和商品详情不能为空。
• 商品价格在 0 到 100。
• 创建日期不能在系统日期之后。

1）创建应用

2）创建数据输入页面

 <%@ page language="java" contenttype="text/html; charset=utf-8"     pageencoding="utf-8"%> <%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%>                     
             
 添加一件商品 
             
                 商品名:                              
             
                 商品详情:                              
             
                 商品价格:                              
             
                 创建日期:                                  (yyyy-mm-dd)             
             
                                               
         
                         

3）编写模型类

 package pojo;  import java.util.date;  import org.springframework.format.annotation.datetimeformat;  public class goods {     private string gname;     private string gdescription;     private double gprice;     // 日期格式化（需要在配置文件中配置formattingconversionservicefactorybean)     @datetimeformat(pattern = "yyyy-mm-dd")     private date gdate;      public string getgname() {         return gname;     }      public void setgname(string gname) {         this.gname = gname;     }      public string getgdescription() {         return gdescription;     }      public void setgdescription(string gdescription) {         this.gdescription = gdescription;     }      public double getgprice() {         return gprice;     }      public void setgprice(double gprice) {         this.gprice = gprice;     }      public date getgdate() {         return gdate;     }      public void setgdate(date gdate) {         this.gdate = gdate;     } }

4）编写验证器类

 package validator;  import java.util.date; import org.springframework.stereotype.component; import org.springframework.validation.errors; import org.springframework.validation.validationutils; import org.springframework.validation.validator; import pojo.goods;  @component public class goodsvalidator implements validator {     @override     public boolean supports(class klass) {         // 要验证的model,返回值为false则不验证         return goods.class.isassignablefrom(klass);     }      @override     public void validate(object object, errors errors) {         goods goods = (goods) object; // object要验证的对象         // goods.gname.required是错误消息属性文件中的编码(国际化后对应的是国际化的信息)         validationutils.rejectifempty(errors, "gname", "goods. gname.required");         validationutils.rejectifempty(errors, "gdescription",                 "goods.gdescription.required");         if (goods.getgprice() > 100 || goods.getgprice() < 0) {             errors.rejectvalue("gprice", "gprice.invalid");         }         date goodsdate = goods.getgdate();         // 在系统时间之后         if (goodsdate != null && goodsdate.after(new date())) {             errors.rejectvalue("gdate", "gdate.invalid");         }     } }

5）编写错误消息属性文件

goods.gname.required=请输入商品名称 goods.gdescription.required=请输入商品详情 gprice.invalid=价格为0~100 gdate.invalid=创建日期不能在系统日期之后

goods.gname.required=\u8bf7\u8f93\u5165\u5546\u54c1\u540d\u79f0 goods.gdescription.required=\u8bf7\u8f93\u5165\u5546\u54c1\u8be6\u60c5 gprice.invalid=\u4ef7\u683c\u4e3a0~100 gdate.invalid=\u521b\u5efa\u65e5\u671f\u4e0d\u80fd\u5728\u7cfb\u7edf\u65e5\u671f\u4e4b\u540e

6）编写 service 层

 package service; import java.util.arraylist; import pojo.goods; public interface goodsservice {     public boolean save(goods g);      public arraylist getgoods(); }

 package service;  import java.util.arraylist; import org.springframework.stereotype.service; import pojo.goods;  @service public class goodsserviceimpl implements goodsservice {     // 使用静态集合变量goods模拟数据库     private static arraylist goods = new arraylist();      @override     public boolean save(goods g) {         goods.add(g);         return true;     }      @override     public arraylist getgoods() {         return goods;     } }

7）编写控制器类

 package controller;  import javax.annotation.resource; import org.apache.commons.logging.log; import org.apache.commons.logging.logfactory; import org.springframework.beans.factory.annotation.autowired; import org.springframework.stereotype.controller; import org.springframework.ui.model; import org.springframework.validation.bindingresult; import org.springframework.validation.validator; import org.springframework.web.bind.annotation.modelattribute; import org.springframework.web.bind.annotation.requestmapping; import pojo.goods; import service.goodsservice;  @controller @requestmapping("/goods") public class goodscontroller {     // 得到一个用来记录日志的对象，这样在打印信息的时候能够标记打印的是哪个类的信息     private static final log logger = logfactory.getlog(goodscontroller.class);      @autowired     private goodsservice goodsservice;     // 注解验证器相当于"goodsvalidator validator=new goodsvalidator () ; "     @resource     private validator validator;      @requestmapping("/input")     public string input(model model) {         // 如果model中没有goods属性，addgoods.jsp会抛出异常         // 因为表单标签无法找到modelattribute属性指定的form backing object         model.addattribute("goods", new goods());         return "addgoods";     }      @requestmapping("/save")     public string save(@modelattribute goods goods, bindingresult result,             model model) {         this.validator.validate(goods, result); // 添加验证         if (result.haserrors()) {             return "addgoods";         }          goodsservice.save(goods);         logger.info("添加成功");         model.addattribute("goodslist", goodsservice.getgoods());         return "goodslist";     } }

8）编写配置文件

9）创建数据显示页面

 <%@ page language="java" contenttype="text/html; charset=utf-8"     pageencoding="utf-8"%> <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>                         
         
             
商品名
             
商品详情
             
商品价格
             
创建日期
         
         
                 
${goods.gname }
                 
${goods.gdescription }
                 
${goods.gprice }
                 
${goods.gdate }
             
              
  

10）创建 web.xml 文件

                     springmvc         org.springframework.web.servlet.dispatcherservlet     1                   springmvc         /                        encodingfilter                       org.springframework.web.filter.characterencodingfilter                       encoding         utf-8                   forceencoding         true                        encodingfilter         /*      

11）测试应用