一：引入必要的包
<!--文件上传-->
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
二：在spring-service中配置
<!-- 支持上传文件 -->
<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>
</bean>
三：文件上传
3.1 实现方法
/**
* 文件上传
* @param file
* @param request
* @return
*/
public JSONObject uploadFile(MultipartFile file, HttpServletRequest request){
//获取文件名称
String fileName = file.getOriginalFilename();
//获取文件存放路径
String path = request.getSession().getServletContext().getRealPath("").concat("/uploadFile");
// String path = getUploadPath(fileName,request);
//上传文件
File targetFile = new File(path, fileName);
if(!targetFile.exists()){
targetFile.mkdirs();
}
//保存
try {
file.transferTo(targetFile);
} catch (Exception e) {
e.printStackTrace();
return resultErrorJson(fileName);
}
logger.info(fileName+"文件上传成功");
JSONObject jsonObject = new JSONObject();
jsonObject.put("key","true");
jsonObject.put("name",fileName);
jsonObject.put("path",path+"/"+fileName);
return jsonObject;
}
3.2 controller层
@RequestMapping(value="/upload")
@ResponseBody
public JSONObject upload(@RequestParam(value = "file") MultipartFile file, HttpServletRequest request){
fileOperation = new FileOperation();
//返回文件后的文件路径
return fileOperation.uploadFile(file,request);
}
3.3 文本递交的时候 注意提交格式
<form action="/file/upload" method="post" enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit" value="提交">
</form>
四：文件下载
/**
* 下载文件
* @param fileName 文件模板
* HttpServletRequest request,
* @param response response请求
*/
public boolean download(String fileName, HttpServletRequest request,HttpServletResponse response) {
try {
response.setContentType("application/force-download");
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 = inputStream.read(b)) > 0) {
os.write(b, 0, length);
}
os.flush();
os.close();
inputStream.close(); } catch (FileNotFoundException e) {
e.printStackTrace();
System.out.println("文件下载失败");
return false;
}catch (IOException e) {
e.printStackTrace();
System.out.println("文件下载失败");
return false; }
return true;
}
五 删除文件
/**
* 通过文件绝对路径 删除单个文件
* @param filePath
*/
public boolean delFile(String filePath) {
File delFile = new File(filePath);
if(delFile.isFile() && delFile.exists()) {
delFile.delete();
logger.info("删除文件成功");
return true;
}else {
logger.info("没有该文件，删除失败");
return false;
}
}