One : Introduce the necessary packages

 <!-- Upload files -->
<!-- -->

Two : stay spring-service Middle configuration

<!-- Support to upload files -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8"></property>
<property name="maxUploadSize" value="10485760000"></property>
<property name="maxInMemorySize" value="40960"></property>

3、 ... and : Upload files

3.1 Implementation method

* Upload files
* @param file
* @param request
* @return
public JSONObject uploadFile(MultipartFile file, HttpServletRequest request){
// Get the file name
String fileName = file.getOriginalFilename();
// Get the file storage path
String path = request.getSession().getServletContext().getRealPath("").concat("/uploadFile");
// String path = getUploadPath(fileName,request);
// Upload files
File targetFile = new File(path, fileName);
// preservation
try {
} catch (Exception e) {
return resultErrorJson(fileName);
}" File upload succeeded ");
JSONObject jsonObject = new JSONObject();
return jsonObject;

3.2 controller layer

public JSONObject upload(@RequestParam(value = "file") MultipartFile file, HttpServletRequest request){
fileOperation = new FileOperation();
// Return the file path after the file
return fileOperation.uploadFile(file,request);

3.3 When the text is submitted Pay attention to the submission format

 <form action="/file/upload" method="post" enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit" value=" Submit ">

Four : File download

* Download the file
* @param fileName File template
* HttpServletRequest request,
* @param response response request
public boolean download(String fileName, HttpServletRequest request,HttpServletResponse response) {
try {
response.setHeader("Content-Disposition", "attachment;fileName="
+ fileName);
String path = request.getSession().getServletContext().getRealPath("")+"/uploadFile/"+fileName;
File tempFile =new File(path); InputStream inputStream = new FileInputStream(tempFile);
OutputStream os = response.getOutputStream();
byte[] b = new byte[2048];
int length;
while ((length = > 0) {
os.write(b, 0, length);
inputStream.close(); } catch (FileNotFoundException e) {
System.out.println(" File download failed ");
return false;
}catch (IOException e) {
System.out.println(" File download failed ");
return false; }
return true;

5、 ... and Delete file

* Through the file absolute path Delete single file
* @param filePath
public boolean delFile(String filePath) {
File delFile = new File(filePath);
if(delFile.isFile() && delFile.exists()) {
delFile.delete();" Delete file succeeded ");
return true;
}else {" There is no such document , Delete failed ");
return false;

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