84 lines
3.1 KiB
Java
84 lines
3.1 KiB
Java
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package example.controller;
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import java.io.File;
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import java.io.IOException;
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import java.util.List;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.apache.commons.fileupload.FileItem;
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import org.apache.commons.fileupload.disk.DiskFileItemFactory;
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import org.apache.commons.fileupload.servlet.ServletFileUpload;
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@WebServlet("/UploadServlet")
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public class UploadServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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// 设置上传目录
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private static final String UPLOAD_DIRECTORY = "uploads";
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// 上传配置
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private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB
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private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
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private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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// 检查请求是否为多部分内容
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if (!ServletFileUpload.isMultipartContent(request)) {
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response.getWriter().println("Error: Form must have enctype=multipart/form-data.");
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return;
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}
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// 配置上传参数
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DiskFileItemFactory factory = new DiskFileItemFactory();
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factory.setSizeThreshold(MEMORY_THRESHOLD);
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factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
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ServletFileUpload upload = new ServletFileUpload(factory);
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upload.setFileSizeMax(MAX_FILE_SIZE);
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upload.setSizeMax(MAX_REQUEST_SIZE);
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// 构造上传路径
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String uploadPath = getServletContext().getRealPath("") + File.separator + UPLOAD_DIRECTORY;
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// 如果目录不存在，则创建
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File uploadDir = new File(uploadPath);
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if (!uploadDir.exists()) {
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uploadDir.mkdir();
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}
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try {
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// 解析请求的内容
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@SuppressWarnings("unchecked")
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List<FileItem> formItems = upload.parseRequest(request);
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if (formItems != null && formItems.size() > 0) {
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for (FileItem item : formItems) {
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// 处理非表单字段
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if (!item.isFormField()) {
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String fileName = new File(item.getName()).getName();
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String filePath = uploadPath + File.separator + fileName;
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File storeFile = new File(filePath);
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// 保存文件到磁盘
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item.write(storeFile);
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request.setAttribute("message", "文件上传成功: " + fileName);
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request.setAttribute("fileName",fileName);
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}
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}
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}
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} catch (Exception ex) {
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request.setAttribute("message", "错误信息: " + ex.getMessage());
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}
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// 转发到 JSP 显示消息
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getServletContext().getRequestDispatcher("/msg.jsp").forward(request, response);
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}
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}
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