SpringMVC中自定义（日期）类型转换器

爱被打了一巴掌 2023-01-10 14:39 111阅读 0赞

### 目录 ###

*  说明
 *  解决办法
 *  效果展示

# 说明 #

**注意：****表单提交的任何数据类型全部都是字符串类型，但是后台定义Integer类型，数据也可以封装上，说明Spring框架内部会默认进行数据类型转换。**

# 解决办法 #

> **1、自定义类型转换器，实现Converter的接口**

**StringToDateConverter类：**

package com.Keafmd.utils;
    
    import org.springframework.core.convert.converter.Converter;
    
    import java.text.DateFormat;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    
    /** * Keafmd * * @ClassName: StringToDateConverter * @Description: 把字符串转换成日期的转换器 * @author: 牛哄哄的柯南 * @date: 2021-01-24 19:27 */
    public class StringToDateConverter implements Converter<String,Date> { 
    
        @Override
        public Date convert(String s) { 
            if(s==null){ 
                throw new RuntimeException("请传入数据");
            }
            DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    
            try { 
                //把字符串转为日期
                return dateFormat.parse(s);
            } catch (ParseException e) { 
                throw new RuntimeException("数据类型转换错误");
            }
    
        }
    }

> **2、注册自定义类型转换器，在springmvc.xml配置文件中编写配置。**

<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
           <property name="converters">
               <set>
                   <bean class="com.Keafmd.utils.StringToDateConverter"/>
               </set>
           </property>
       </bean>
    
    
    
       <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>

# 效果展示 #

**User类：**

package com.Keafmd.domain;
    
    import java.io.Serializable;
    import java.util.Date;
    
    /** * Keafmd * * @ClassName: User * @Description: * @author: 牛哄哄的柯南 * @date: 2021-01-24 16:14 */
    public class User implements Serializable { 
        private String uname;
        private Integer age;
        private Date birthday;
    
        public String getUname() { 
            return uname;
        }
    
        public void setUname(String uname) { 
            this.uname = uname;
        }
    
        public Integer getAge() { 
            return age;
        }
    
        public void setAge(Integer age) { 
            this.age = age;
        }
    
        public Date getBirthday() { 
            return birthday;
        }
    
        public void setBirthday(Date birthday) { 
            this.birthday = birthday;
        }
      
        @Override
        public String toString() { 
            return "User{" +
                    "uname='" + uname + '\'' +
                    ", age=" + age +
                    ", birthday=" + birthday +
                    '}';
        }
    }

**控制器代码：**

package com.Keafmd.controller;
    
    import com.Keafmd.domain.Account;
    import com.Keafmd.domain.User;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import javax.servlet.ServletContext;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    /** * Keafmd * * @ClassName: ParamController * @Description: * @author: 牛哄哄的柯南 * @date: 2021-01-24 15:57 */
    
    @Controller
    @RequestMapping("/param")
    public class ParamController { 
    
        /** * 自定义类型转换器 * @param user * @return */
        @RequestMapping("/saveUser")
        public String testParam(User user){ 
            System.out.println(user);
            return "success";
        }
    
    
    }

**jsp代码：**

<%--
      Created by IntelliJ IDEA.
      User: Keafmd
      Date: 2021/1/24
      Time: 15:55
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>请求参数绑定</title>
    </head>
    <body>
    
    <%--自定义类型转换器--%>
    <form action="param/saveUser" method="post">
        用户姓名：<input type="text" name="uname" /><br/>
        用户年龄：<input type="text" name="age" /><br/>
        用户生日：<input type="text" name="birthday" /><br/>
        <input type="submit" value="提交">
    </form>
    
    </body>
    </html>

**浏览器输入：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70]  
**输出结果：**

User{ uname='牛哄哄的柯南', age=21, birthday=Sat Jan 01 00:00:00 CST 2000}

> **以上就是SpringMVC中自定义（日期）类型转换器的全部内容。**

**看完如果对你有帮助，感谢点赞支持！  
如果你是电脑端的话，看到右下角的 “一键三连” 了吗，没错点它\[哈哈\]**  
![在这里插入图片描述][20210115230629703.gif_pic_center]

**加油！**

**共同努力！**

**Keafmd**

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70]: /images/20221119/e4c26ebf765b4c9fb898f759d90da93e.png
[20210115230629703.gif_pic_center]: /images/20221119/6ec4ff2e8c3d424a927fe7e6b4d7674a.png