import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
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("/upload")
public class FileUploadServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 检查请求是否为文件上传请求
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (!isMultipart) {
response.getWriter().println("Invalid request");
return;
}
// 创建文件上传处理工厂
DiskFileItemFactory factory = new DiskFileItemFactory();
// 设置临时文件存储目录（可选）
File tempDir = new File("path/to/temp/dir");
factory.setRepository(tempDir);
// 创建文件上传处理器
ServletFileUpload upload = new ServletFileUpload(factory);
try {
// 解析文件上传请求
List items = upload.parseRequest(request);
// 处理每个文件项
for (FileItem item : items) {
// 判断当前项是否为文件
if (!item.isFormField()) {
// 获取文件名
String fileName = item.getName();
// 保存文件到指定目录
File saveDir = new File("path/to/save/dir");
File file = new File(saveDir, fileName);
item.write(file);
}
}
response.getWriter().println("File uploaded successfully");
} catch (Exception e) {
response.getWriter().println("File upload failed: " + e.getMessage());
}
}