使用Apache Commons FileUpload组件上传文件时总是返回null，调试发现ServletFileUpload对象为空，在Spring Boot中有默认的文件上传组件，在使用ServletFileUpload时需要关闭Spring Boot的默认配置 ，
禁用MultipartResolverSpring提供的默认值
1.0在配置文件中添加
spring.http.multipart.enabled=false
2.0在配置文件中添加
spring.servlet.multipart.enabled=false
@RequestMapping("/upload")
public void upload(HttpServletRequest request, HttpServletResponse response) {
System.out.println("进入后台...");
// 1.创建DiskFileItemFactory对象，配置缓存用
DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
// 2. 创建 ServletFileUpload对象
ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);
// 3. 设置文件名称编码
servletFileUpload.setHeaderEncoding("utf-8");
// 4. 开始解析文件
// 文件md5获取的字符串
String fileMd5 = null;
// 文件的索引
String chunk = null;
try {
List<FileItem> items = servletFileUpload.parseRequest(new ServletRequestContext(request));
for (FileItem fileItem : items) {
if (fileItem.isFormField()) { // >> 普通数据
String fieldName = fileItem.getFieldName();
if ("info".equals(fieldName)) {
String info = fileItem.getString("utf-8");
System.out.println("info:" + info);
}
if ("fileMd5".equals(fieldName)) {
fileMd5 = fileItem.getString("utf-8");
System.out.println("fileMd5:" + fileMd5);
}
if ("chunk".equals(fieldName)) {
chunk = fileItem.getString("utf-8");
System.out.println("chunk:" + chunk);
}
} else {
// 如果文件夹没有创建文件夹
File file = new File(serverPath + fileMd5);
if (!file.exists()) {
boolean result = file.mkdirs();
System.out.println(result);
}
// 保存文件
File chunkFile = new File(serverPath + fileMd5 + "/" + chunk);
FileUtils.copyInputStreamToFile(fileItem.getInputStream(), chunkFile);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="/upload" method="post" enctype="multipart/form-data">
文件：<input type="file" value="请选择文件" name="file"/> <br/>
信息：<input type="text" name="info"/> <br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>