功能:文件上传

public class UoloadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.创建文件磁盘工厂
DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
//2.使用文件磁盘工厂创建文件上传对象
FileUpload fileUpload = new FileUpload(diskFileItemFactory);
//3.使用文件上传对象的parse方法 去解析请求数据流
try {
List<FileItem> lists = fileUpload.parseRequest(request);
for (FileItem fileItem : lists) {
String fieldName = fileItem.getFieldName();
if(fileItem.isFormField()){
//此项是普通输入框
//getFieldName代表的是参数名
//返回参数值
String value = fileItem.getString("utf-8");
System.out.println("参数名:"+fieldName+"-参数值:"+value);
}else{
//文件上传类型
//获取文件名
String name = fileItem.getName();//
//文件输入流
InputStream inputStream = fileItem.getInputStream();
FileOutputStream fileOutputStream = new FileOutputStream("C:\\Users\\huyoufu\\Desktop\\upload\\"+name);
//使用ioutils
IOUtils.copy(inputStream, fileOutputStream);
fileOutputStream.close();
inputStream.close();
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}
//4.返回list集合 装有解析好的 fileItem

功能:文件上传

原文：https://www.cnblogs.com/shan1393/p/9241210.html