从FileItem获取文件并将该文件保存到路径

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import java.io.File;
import java.io.IOException;
import java.util.List;

String tempDir = "临时文件存储目录路径";
String saveDir = "最终保存文件的目录路径";

DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setRepository(new File(tempDir));

ServletFileUpload upload = new ServletFileUpload(factory);
upload.setSizeMax(1024 * 1024 * 10); // 设置文件大小阈值为10MB
upload.setFileSizeMax(1024 * 1024 * 2); // 设置临时文件大小阈值为2MB

List<FileItem> items = upload.parseRequest(request); // request为HttpServletRequest对象

for (FileItem item : items) {
    if (!item.isFormField()) { // 判断是否为文件类型的FileItem对象
        String fileName = item.getName(); // 获取文件名
        String filePath = saveDir + File.separator + fileName; // 拼接最终保存文件的路径
        File file = new File(filePath);
        item.write(file); // 将文件保存到指定路径
    }
}