文件上传与下载
文件上传
- jar包
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
-
文件上传解析器mvc.xml中注册
<!-- 文件解析器 id必须如下multipartResolver--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="102400000"></property> <property name="maxUploadSizePerFile" value="2000000"></property> <property name="defaultEncoding" value="UTF-8"></property> </bean> -
文件提交页面
- 注意enctype="multipart/form-data"
<form action="${webpath}/test/p9" method="post" enctype="multipart/form-data"> 文件：<input type="file" name="file"><br> <input type="submit" value="上传"> </form>-
多文件
<form action="${webpath}/test/p10" method="post" enctype="multipart/form-data"> 文件：<input type="file" name="file"><br> 文件：<input type="file" name="file"><br> <input type="submit" value="上传"> </form>
Controller
- 单文件上传
//File.separator保证了在各类系统下分隔符不出错
private final static String uploadfilepath="E:"+File.separator;
@RequestMapping("/p9")
public String upload(@RequestParam("file") MultipartFile multipartFile, Model model) throws IOException {
if (multipartFile!=null && !multipartFile.isEmpty()){
//获取源文件名
String originalfilename = multipartFile.getOriginalFilename();
//取得文件名前缀
String fileNamePrefix = originalfilename.substring(0, originalfilename.lastIndexOf("."));
//格式化获取时间
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
//创建新文件名
String newfilename = fileNamePrefix + sdf.format(new Date())+originalfilename.substring(originalfilename.lastIndexOf("."));
File file = new File(uploadfilepath + newfilename);
//执行上传操作
multipartFile.transferTo(file);
System.out.println(file.getAbsolutePath());
model.addAttribute("filename", newfilename);
}
return "uploadsuccess";
}
-
多文件上传
-
@RequestMapping("/p10") public String uploadfiles(@RequestParam("file") MultipartFile[] multipartFiles, Model model) throws IOException { List<String> filenames = new ArrayList<>(); if (multipartFiles.length>0){ for (MultipartFile multipartFile:multipartFiles){ if (multipartFile!=null && !multipartFile.isEmpty()){ //获取源文件名 String originalfilename = multipartFile.getOriginalFilename(); //取得文件名前缀 String fileNamePrefix = originalfilename.substring(0, originalfilename.lastIndexOf(".")); //格式化获取时间 SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); //创建新文件名 String newfilename = fileNamePrefix + sdf.format(new Date())+originalfilename.substring(originalfilename.lastIndexOf(".")); File file = new File(uploadfilepath + newfilename); //执行上传操作 multipartFile.transferTo(file); System.out.println(file.getAbsolutePath()); filenames.add(newfilename); } } } model.addAttribute("filenames", filenames); return "uploadsuccess"; }创建一个文件夹
private final static String uploadfilepath="E:"+File.separator; static File files = new File(uploadfilepath+"file1"); static { if (!files.exists()) { files.mkdirs(); } System.out.println(files.getPath()); }
-
文件下载
- 注意设置contentType 注意添加头部信息 ，注意字符编码
private final static String downloadpath="E:"+File.separator;
@RequestMapping("/download")
public String download(HttpServletResponse response){
//定义该文件名
String filename="gakki.jpg";
//获取该文件的路径
Path path = Paths.get(downloadpath, filename);
if (Files.exists(path)){
//获取文件类型名,从'.'后面一位获得
String filesuffix=filename.substring(filename.lastIndexOf(".")+1);
//设置contenttype,只有这样才能下载
response.setContentType("application/"+filesuffix);
//添加头部信息,注意字符编码
try {
response.addHeader("Content-Disposition","attachment;filename="+new String(filename.getBytes("UTF-8"),"ISO8859-1"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
//通过path进行下载,outputStream使用response.getOutputStream
try {
Files.copy(path, response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
