标签：contex property neu store rect exce new 中文 es2017
<form method="post" action="demo3" enctype="multipart/form-data"> 选择一个文件: <input type="file" name="uploadFile"/> <br/><br/> <input type="submit" value="上传"/> </form>
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;//此三个包为 正常包以外 额外需要下载导入
public class ServletDemo3 extends HttpServlet { private static final long serialVersionUID = 1L; // 上传文件存储目录 private static final String UPLOAD_DIRECTORY = "upload"; // 上传配置 private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB /** * 上传数据及保存文件 */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 检测是否为多媒体上传 if (!ServletFileUpload.isMultipartContent(request)) { // 如果不是则停止 PrintWriter writer = response.getWriter(); writer.println("Error: 表单必须包含 enctype=multipart/form-data"); writer.flush(); return; } // 配置上传参数 DiskFileItemFactory factory = new DiskFileItemFactory(); // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中 factory.setSizeThreshold(MEMORY_THRESHOLD); // 设置临时存储目录 factory.setRepository(new File(System.getProperty("java.io.tmpdir"))); ServletFileUpload upload = new ServletFileUpload(factory); // 设置最大文件上传值 upload.setFileSizeMax(MAX_FILE_SIZE); // 设置最大请求值 (包含文件和表单数据) upload.setSizeMax(MAX_REQUEST_SIZE); // 中文处理 upload.setHeaderEncoding("UTF-8"); // 构造临时路径来存储上传的文件 // 这个路径相对当前应用的目录 String uploadPath = request.getServletContext().getRealPath("./") + File.separator + UPLOAD_DIRECTORY; // 如果目录不存在则创建 File uploadDir = new File(uploadPath); if (!uploadDir.exists()) { uploadDir.mkdir(); } try { // 解析请求的内容提取文件数据 @SuppressWarnings("unchecked") List<FileItem> formItems = upload.parseRequest(request); if (formItems != null && formItems.size() > 0) { // 迭代表单数据 for (FileItem item : formItems) { // 处理不在表单中的字段 if (!item.isFormField()) { String fileName = new File(item.getName()).getName(); String filePath = uploadPath + File.separator + fileName; File storeFile = new File(filePath); // 在控制台输出文件的上传路径 System.out.println(filePath); // 保存文件到硬盘 item.write(storeFile); request.setAttribute("message", "文件上传成功!"); } } } } catch (Exception ex) { request.setAttribute("message", "错误信息: " + ex.getMessage()); } // 跳转到 message.jsp request.getServletContext().getRequestDispatcher("/message.jsp").forward( request, response); } }
<servlet>
<servlet-name>servletDemo3</servlet-name>
<servlet-class>com.neunb.servlet.ServletDemo3</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>servletDemo3</servlet-name>
<url-pattern>/demo3</url-pattern>
</servlet-mapping>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文件上传结果</title>
</head>
<body>
<h2>${message}</h2>
</body>
</html>
标签：contex property neu store rect exce new 中文 es2017
原文地址：http://www.cnblogs.com/coderL/p/7522431.html
