package cn.learn.utils;import java.io.File; import java.util.UUID;public class FileUploadUtils {// 得到上傳文件真實名稱 c:\a.txt a.txtpublic static String getRealName(String filename) {int index = filename.lastIndexOf("\\") + 1;return filename.substring(index);}// 獲取隨機名稱 a.txtpublic static String getUUIDFileName(String filename) {int index = filename.lastIndexOf(".");if (index != -1) {return UUID.randomUUID() + filename.substring(index);} else {return UUID.randomUUID().toString();}}// 目錄分離算法public static String getRandomDirectory(String filename) {// int hashcode = filename.hashCode();//// // System.out.println(hashcode);//// // int類型數據在內存中占32位。轉換成16進制數，就得到8個16進制數// String hex = Integer.toHexString(hashcode);//// // System.out.println(hex); // 056d9363//// return "/" + hex.charAt(0) + "/" + hex.charAt(1);int hashcode = filename.hashCode();System.out.println(Integer.toBinaryString(hashcode));int a = hashcode & 0xf;hashcode = hashcode >>> 4;int b = hashcode & 0xf;return "/" + a + "/" + b;}} package cn.learn.web.servlet;import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.List;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.commons.io.IOUtils;import cn.learn.utils.FileUploadUtils;public class Upload4Servlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");// 1.創(chuàng)建 DiskFileItemFactoryFile file = new File(this.getServletContext().getRealPath("/temp"));// 獲取temp目錄部署到tomcat后的絕對磁盤路徑DiskFileItemFactory factory = new DiskFileItemFactory(1024 * 100, file); // 使用默認的.// 2.創(chuàng)建ServletFileUploadServletFileUpload upload = new ServletFileUpload(factory);boolean flag = upload.isMultipartContent(request); // 用于判斷是否是上傳操作.if (flag) {// 解決上傳文件名稱中文亂碼upload.setHeaderEncoding("utf-8");// 設置上傳文件大小// upload.setSizeMax(1024 * 1024 * 10);// 總大小為10mtry {List<FileItem> items = upload.parseRequest(request);// 解決request,得到所有的上傳項FileItem// 3.得到所有上傳項for (FileItem item : items) {if (!item.isFormField()) {// 上傳組件String name = item.getName(); // 上傳文件名稱// 得到上傳文件真實名稱String filename = FileUploadUtils.getRealName(name);// 得到隨機名稱String uuidname = FileUploadUtils.getUUIDFileName(filename);// 得到隨機目錄String randomDirectory = FileUploadUtils.getRandomDirectory(filename);// 注意:隨機目錄可能不存在，需要創(chuàng)建.String parentPath = this.getServletContext().getRealPath("/upload");File rd = new File(parentPath, randomDirectory);if (!rd.exists()) {rd.mkdirs();}IOUtils.copy(item.getInputStream(),new FileOutputStream(new File(rd, uuidname)));// 刪除臨時文件item.delete();}}} catch (FileUploadException e) {// e.printStackTrace();response.getWriter().write(e.getMessage());return;}} else {response.getWriter().write("不是上傳操作");return;}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

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