springMVC文件上传（两种方式）-CFANZ编程社区

<!--文件上传依赖包-->
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

传统文件上传：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>文件上传</title>
</head>
<body>
<h3>传统文件上传</h3>
<form action="/file/upload" method="post" enctype="multipart/form-data">
    选择文件：<input type="file" name="upload"/><br/>
    <input type="submit" value="上传文件"/>
</form>
</body>
</html>

@Controller
@RequestMapping(value = "/file")
public class UploadController {
    /**
     * 传统文件上传
     * @param request
     * @return
     * @throws Exception
     */
    @RequestMapping(value = "/upload")
    public String upload(HttpServletRequest request) throws Exception{
        //获取指定文件夹的真实路径
        String path = request.getSession().getServletContext().getRealPath("/uploads");
        
        //创建磁盘文件工厂处理对象
        DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
        //创建表单解析对象
        ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);

        //获取所有表单数据
        List<FileItem> fileItems = servletFileUpload.parseRequest(request);

        //循环表单数据
        for (FileItem fileItem : fileItems) {
            //不是普通的文本表单，也就是文件上传表单
            if (!fileItem.isFormField()) {
                //获取文件后缀名字
                String extName = StringUtils.getFilenameExtension(fileItem.getName());
                
                //随机给上传的文件取名字
                String fileName = UUID.randomUUID().toString();

                //数据写入磁盘
                fileItem.write(new File(path,fileName+"."+extName));
                //然后删除临时文件
                fileItem.delete();
            }
        }
        
        return "success";
    }
}

(3)测试

SpringMVC的文件上传：

<!-- 配置文件解析器对象,要求id名称必须是multipartResolver,因为DispatcherServlet源码中默认用的是它 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="10485760"/>
    <property name="defaultEncoding" value="UTF-8" />
</bean>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>文件上传</title>
</head>
<body>
<h3>SpringMVC文件上传</h3>
<form action="/file/mvc/upload" method="post" enctype="multipart/form-data">
    选择文件：<input type="file" name="upload"/><br/>
    <input type="submit" value="上传文件"/>
</form>
</body>
</html>

/**
 * SpringMVC方式的文件上传
 * @param request
 * @return
 * @throws Exception
 */
@RequestMapping(value = "/mvc/upload")
public String upload(HttpServletRequest request, MultipartFile upload) throws Exception {
    //先获取到要上传的文件目录
    String path = request.getSession().getServletContext().getRealPath("/uploads");
    
    //获取到上传文件的名称
    String filename = upload.getOriginalFilename();
    //获取文件后缀
    String extName = StringUtils.getFilenameExtension(filename);
    
    //随机给上传的文件取名字
    String newFileName = UUID.randomUUID().toString();

    //上传文件
    upload.transferTo(new File(path, newFileName+"."+extName));
    
    return "success";
}