Analysis of multi part types in spring MVC

On the modify goods page, add the upload goods picture function.

When submitting the data of enctype = "multipart / form data" in the page form, spring MVC needs to parse the data of multipart type.

Configure the multipart type parser in springmvc.xml.

<!-- File upload -->
<bean id="multipartResolver"
      class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!-- Set the maximum size of the uploaded file to 5 MB -->
    <property name="maxUploadSize">
        <value>5242880</value>
    </property>
</bean>

Add the jar for uploading pictures

Add dependency

<!-- File upload -->
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>

Dependency tree

[INFO] \- commons-fileupload:commons-fileupload:jar:1.3.1:compile
[INFO]    \- commons-io:commons-io:jar:2.2:compile

As you can see, it also indirectly depends on Commons IO: commons IO: jar

Upload picture code

• page

<tr>
	<td>Commodity pictures</td>
	<td>
		<c:if test="${items.pic !=null}">
			<img src="/pic/${items.pic}" width=100 height=100/>
			<br/>
		</c:if>
		<input type="file" name="items_pic"/>
	</td>
</tr>

• controller method

Modify: product modify controller method:

@RequestMapping("/editItemsSubmit")
public String editItemsSubmit(ItemsCustom itemsCustom, MultipartFile items_pic) throws Exception {

    //Original name
    String originalFilename = items_pic.getOriginalFilename();
    //Upload pictures
    if (items_pic != null && originalFilename != null && originalFilename.length() > 0) {
        //Physical path to store pictures
        String pic_path = "D:\\tmp\\";
        //New picture name
        String newFileName = UUID.randomUUID() + originalFilename.substring(originalFilename.lastIndexOf("."));
        //New picture
        File newFile = new File(pic_path + newFileName);
        //Write data in memory to disk
        items_pic.transferTo(newFile);
        //Write the new picture name to itemsCustom
        itemsCustom.setPic(newFileName);
    }
}