SpringMVC-参数

一、普通字符串参数

    @RequestMapping("/test2")
    @ResponseBody
    public String test2(String username, String password) {
        System.out.println(username);
        System.out.println(password);
        return "success";
    }

二、数组参数

   @RequestMapping("/test1")
    @ResponseBody
    public String test1(@RequestParam Map<String, Object> map,
                        @RequestParam(required = false)List<String> hobby) {
        System.out.println(map);
        for (String s : hobby) {
            System.out.println(s);
        }
        return "success";
    }

三、文件上传参数

需要引入三方库

 <!--文件上传的三方库 解析：multipart参数-->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.4</version>
        </dependency>


    @RequestMapping("/test3")
    @ResponseBody
    public String test3(String username,
                        MultipartFile photo1,
                        MultipartFile photo2,
                        HttpServletRequest request) throws Exception {

        System.out.println(username);
        // 将文件数据写入到具体的数据
        // 文件名最好不要这么些，如果一样的话会覆盖，自己生成文件名
        String filename = photo1.getOriginalFilename();
        String path = request.getServletContext().getRealPath("upload/img" + filename);
        File file = new File(path);
        photo1.transferTo(file);

        filename = photo2.getOriginalFilename();
        path = request.getServletContext().getRealPath("upload/img" + filename);
        file = new File(path);
        photo2.transferTo(file);

        return "success";
    }


@RequestMapping("/test4")
    @ResponseBody
    public String test4(String username,
                        MultipartFile[] photos,
                        HttpServletRequest request) throws Exception {
        System.out.println(username);
        for (MultipartFile photo : photos) {
            System.out.println(photo.getOriginalFilename());
        }
        return "success";
    }

配置文件：


    <!--解析multipart参数-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!--保证请求参数，文件名不乱码-->
        <property name="defaultEncoding" value="UTF-8"/>
    </bean>

四、日期参数（两种方式）

用系统自带的处理

  @RequestMapping("/test5")
    @ResponseBody
    public String test5(@DateTimeFormat(pattern = "yyyy-MM-dd") Date birthday) throws Exception {
        System.out.println(birthday);
        return "success";
    }

手动配置转换器

转换类：

package com.mj.converter;

import org.springframework.core.convert.converter.Converter;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateConverter implements Converter<String, Date> {
    public Date convert(String source) {
        try {
            return new SimpleDateFormat("yyyy-MM-dd").parse(source);
        } catch (ParseException e) {
            e.printStackTrace();
            return null;
        }
    }
}

配置文件：

  <mvc:annotation-driven conversion-service="conversionService">


 <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters">
            <set>
                <bean class="com.mj.converter.DateConverter"/>
            </set>
        </property>
    </bean>

五、测试jsp文件如下：

<%--
  Created by IntelliJ IDEA.
  User: majiancheng
  Date: 2022/10/9
  Time: 上午9:24
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>

<div>
    普通参数
    <form action="test0" method="post">
        <input name="username">
        <input name="password">
        <button type="submit">提交</button>
    </form>
</div>

<div>
    多个参数
    <form action="test1">
        <input name="name">
        <input name="age">
        <div>
            足球<input type="checkbox" value="1" name="hobby">
        </div>
        <div>
            篮球<input type="checkbox" value="2" name="hobby">
        </div>
        <div>
            台球<input type="checkbox" value="3" name="hobby">
        </div>
        <button type="submit">提交</button>
    </form>
</div>


<div>
    <form action="test2" method="post" enctype="multipart/form-data">
        <input name="username">
        <input name="password">
        <button type="submit">提交</button>
    </form>
</div>

    <div>
        <form action="test3" method="post" enctype="multipart/form-data">
            <input name="username">
            <input name="photo1" type="file">
            <input name="photo2" type="file">
            <button type="submit">提交</button>
        </form>
    </div>

    <div>
        <form action="test4" method="post" enctype="multipart/form-data">
            <input name="username">
            <input name="photos" type="file">
            <input name="photos" type="file">
            <button type="submit">提交</button>
        </form>
    </div>

    <div>
        日期处理5：
        <form action="test5" method="post" >
            <input name="birthday" type="date">
            <button type="submit">提交</button>
        </form>
    </div>

<div>
    日期处理6：
    <form action="test6" method="post" >
        <input name="birthday" type="date">
        <button type="submit">提交</button>
    </form>
</div>

</body>
</html>

一、普通字符串参数

二、数组参数

三、文件上传参数

四、日期参数（两种方式）

五、测试jsp文件如下：

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