Springmvc是java目前最常用的架构之一,你知道在springmvc架构下该如何实现文件上传功能吗?下面快跟小编来看看吧。
Springmvc上传功能实现
在SpringMVC中,它为文件的上传提供了MultipartResolver来实现,SpringMVC使用Apache Commons FileUpload技术实现了一个MultipartResolver实现类:CommonsMultipartResolver。因此,SpringMVC的文件上传还需要依赖Apache Commons FileUpload的组件。
1)、 pom文件添加所需依赖
<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.3</version> </dependency> < dependency > <groupId>commons-fileupload</groupId> < artifactId > commons - fileupload < /artifactId> < version > 1.3 .2 < /version> < /dependency>
2)、配置文件上传所需bean
<!-- SpringMVC上传文件时,需要配置MultipartResolver处理器 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="UTF-8" /> </bean>
3)、文件上传代码编写
上传文件界面:upload_form.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>文件上传</title> </head> <body> <!-- 上传单个对象 注意表单的method属性设为post,enctype属性设为multipart/form-data --> <form method="POST" action="/SpringMVCDemo1/upload" enctype="multipart/form-data"> <input type="file" name="file" /><br/><br/> <input type="submit" value="上传" /> </form> <!-- 上传多个对象 注意表单的method属性设为post,enctype属性设为multipart/form-data --> <form method="POST" action="/SpringMVCDemo1/uploadMultiFiles" enctype="multipart/form-data"> <p>文件1:<input type="file" name="file" /></p> <p>文件2:<input type="file" name="file" /></p> <p>文件3:<input type="file" name="file" /></p> <!-- 同时传递其他业务字段 --> <p>用户名:<input type="text" name="userName" /></p> <p>密码:<input type="password" name="password" /></p> <p><input type="submit" value="上传" /></p> </form> </body> </html>
上传文件必须把表单的method设置为POST,且将enctype设置为multipart/form-data。只有在这样的情况下,浏览器才会把用户选择的文件以二进制数据发送给服务器。
上传结果返回界面:upload_result.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <h2>上传结果为:${message}</h2> </body> </html>
注:需要提前准备存储文件的文件夹,如:"D:staticResourcesTestimgupload"
FileController.java页面
@Controller @RequestMapping("/SpringMVCDemo1") public class FileController { /** * 跳转到上传页面 * @GetMapping 是一个组合注解,是@RequestMapping(method = RequestMethod.GET)的缩写。 */ @GetMapping("/gotoUploadForm") public String index() { return "/upload_form.jsp"; } /** * 上传单个文件 * 通过MultipartFile读取文件信息,如果文件为空跳转到结果页并给出提示; * 如果不为空读取文件流并写入到指定目录,最后将结果展示到页面 * @param multipartFile * @PostMapping 是一个组合注解,是@RequestMapping(method = RequestMethod.POST)的缩写。 */ @PostMapping("/upload") public String uploadSingleFile(@RequestParam("file") MultipartFile multipartFile, HttpServletRequest request) { if (multipartFile.isEmpty()) { request.setAttribute("message", "Please select a file to upload '"); return "/upload_result.jsp"; } try { String contentType = multipartFile.getContentType(); String originalFilename = multipartFile.getOriginalFilename(); byte[] bytes = multipartFile.getBytes(); System.out.println("上传文件名为-->" + originalFilename); System.out.println("上传文件类型为-->" + contentType); System.out.println("上传文件大小为-->" + bytes.length); //filePath为存储路径 String filePath = "d:/staticResourcesTest"; System.out.println("filePath-->" + filePath); //存储在staticResourcesTest下的imgupload文件夹下 File parentPath = new File(filePath, "imgupload"); System.out.println("上传目的地为-->" + parentPath.getAbsolutePath()); try { File destFile = new File(parentPath, originalFilename); //上传目的地 FileUtils.writeByteArrayToFile(destFile, multipartFile.getBytes()); } catch (Exception e) { e.printStackTrace(); } request.setAttribute("message", "You successfully uploaded '" + multipartFile.getOriginalFilename() + "'"); } catch (IOException e) { e.printStackTrace(); } return "/upload_result.jsp"; } /** * 上传多个文件,同时接受业务数据 * @param origFiles * @param request * @param user * @return */ @PostMapping("/uploadMultiFiles") public String uploadMultiFiles(@RequestParam("file") List < MultipartFile > origFiles, HttpServletRequest request, User user) { //User为实体类 System.out.println("User==" + user); if (origFiles.isEmpty()) { request.setAttribute("message", "Please select a file to upload '"); return "/upload_result.jsp"; } try { for (MultipartFile origFile: origFiles) { String contentType = origFile.getContentType(); String fileName = origFile.getOriginalFilename(); byte[] bytes = origFile.getBytes(); System.out.println("上传文件名为-->" + fileName); System.out.println("上传文件类型为-->" + contentType); System.out.println("上传文件大小为-->" + bytes.length); String filePath = "d:/staticResourcesTest"; System.out.println("上传目的地为-->" + filePath); try { //上传目的地(staticResourcesTest文件夹下) File destFile = new File(filePath, fileName); FileUtils.writeByteArrayToFile(destFile, origFile.getBytes()); } catch (Exception e) { e.printStackTrace(); } } request.setAttribute("message", "You successfully uploaded '"); } catch (IOException e) { e.printStackTrace(); } return "/upload_result.jsp"; } }
以上就是springmvc上传文件功能实现的所有内容了,如果你还需要了解更多相关java架构师知识,就请关注我们的网站吧。
推荐阅读: