java import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.IOException; import java.util.List;

@WebServlet public class UploadServlet extends HttpServlet { protected void doPost throws ServletException, IOException { String uploadFileName = ""; String newFileName = ""; String savePath = this.getServletConfig.getServletContext.getRealPath; savePath = savePath + "upload/files/"; File file = new File; if ) { file.mkdirs; } DiskFileItemFactory factory = new DiskFileItemFactory; ServletFileUpload upload = new ServletFileUpload; try { List items = upload.parseRequest; for ; i.hasNext;) { FileItem item = i.next; if ) { uploadFileName = item.getName; String str = uploadFileName.split; newFileName = str; if || newFileName.toLowerCase.indexOf != -1 || newFileName.toLowerCase.indexOf != -1) { File uploadedFile = new File; item.write; } } } } catch { e.printStackTrace; } String result_str = "{\"status\":1, \"message\":\"上传成功\",\"url\":\"" + newFileName + "\"}"; response.getWriter.write; } }

这段Java代码是一个Servlet，用于处理用户上传的文件。它定义了一个doPost方法，该方法解析上传的文件，并将其保存到服务器上的指定目录。Ru果上传成功，它将返回一个包含状态、消息和文件URL的JSON字符串。代码用了DiskFileItemFactory和ServletFileUpload来解析上传的文件。