Java中的多种文件上传方式总结

目录请求类型单文件上传多文件上传多文件单字段上传多文件多字段上传

请求类型

单文件上传

//上传单个文件

@ResponseBody

@RequestMapping(value = "uploadfile", produces = "multipart/form-data;charset=UTF-8")

public String uploadfiles(HttpServletRequest request){

CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());

if (multipartResolver.isMultipart(request)) {

DefaultMultipartHttpServletRequest multipartRequest = (DefaultMultipartHttpServletRequest) request;

MultipartFile multipartFile = multipartRequest.getFile("file");

if (multipartFile == null) {

System.out.println("multipartFile == null");

}

String filename = multipartRequest.getFile("file").getOriginalFilename();

String tmpFile = request.getSession().getServletContext().getRealPath("/") + UUID.randomUUID().toString().replace("-", "") + ".apk";

File targetFile = new File(tmpFile);

AppEntity appEntity = new AppEntity();

if (null != multipartFile) {

//保存文件

try {

multipartFile.transferTo(targetFile);

} catch (IllegalStateException e) {

logger.error("multipartFile.transferTo, IllegalStateException", e);

} catch (IOException e) {

logger.error("multipartFile.transferTo, IOException", e);

}

}

}

return "";

}

多文件上传

多文件单字段上传

@ResponseBody

@RequestMapping(value = "uploadfiles", produces = "multipart/form-data;charset=UTF-8")

public String uploadfile(MultipartHttpServletRequest request){

CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());

if (multipartResolver.isMultipart(request)) {

//上传多个文件，一个字段中包含多个文件

String projectPath = request.getSession().getServletContext().getRealPath("/");

MultiValueMap multiFileMap = request.getMultiFileMap();

List fileSet = new LinkedList<>();

for(Map.Entry> temp : multiFileMap.entrySet()){

fileSet = temp.getValue();

}

for(MultipartFile temp : fileSet){

File file2 = new File(projectPath+temp.getOriginalFilename());

try {

temp.transferTo(file2);

} catch (IOException e) {

e.printStackTrace();

}

}

}

return "";

}

多文件多字段上传

@ResponseBody

@RequestMapping(value = "uploadfiles", produces = "multipart/form-data;charset=UTF-8")

public String uploadfile(MultipartHttpServletRequest request){

CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());

if (multipartResolver.isMultipart(request)) {

//上传多个文件，每个字段一个文件

Iterator fileNames = request.getFileNames();

while (fileNames.hasNext()){

// 取得上传文件

String uploadName = fileNames.next();

MultipartFile file = request.getFile(uploadName);

if (file != null) {

String projectPath = request.getSession().getServletContext().getRealPath("/");

String originalFilename = file.getOriginalFilename();

String tmpFile = projectPath + System.currentTimeMillis() + "_" + originalFilename;

File targetFile = new File(tmpFile);

try {

file.transferTo(targetFile);

} catch (IOException e) {

e.printStackTrace();

}

}

}

jzsUxw }

return "";

}

如果上面方法不行,看下面

@PostMapping(value = "test", produces = "multipart/form-data;charset=UTF-8")

public void UploadFiles(HttpServletRequest request) throws IOException {

//如果请求中包含文件

if(ServletFileUpload.isMultipartContent(request)){

// 创建一个通用的多部分解析器

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

List files = multipartRequest.getFiles("file");

File targetFile;

for (MultipartFile file : files){

//保存文件到本地

String projectPath = request.getSession().getServletContext().getRealPath("/");

projectPath = projectPath + System.currentTimeMillis() + "_" + new Random().nextInt(100);

File dir = new File(projectPath);

if (!dir.exists()){

dir.mkdir();

}

String originalFilename = file.getOriginalFilename();

String tmpFile = projectPath + File.separator + originalFilename;

targetFile = new File(tmpFile);

file.transferTo(targetFile);

//将文件保存到本地并记录信息

//...

}

}

}

还有一种方法，函数入参直接接受文件

例如：

//单文件

public String UploadFiles(@RequestParam("file") MultipartFile file){

}

//多文件

public String UploadFiles(@RequestParam("file") List files){

}

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