JSP/servlet實現檔案上傳下載和刪除

最後更新：2018-12-03 來源：互聯網

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由於儲存空間，對一般使用者而言，就是用來操作隱藏檔的，所以這兩天，特意看了一下windows下用servlet實現檔案上傳、下載和刪除，下面是詳細代碼說明

上傳：

用的是commons-fileupload-1.2.2.jar和commons-io-2.0.1.jar組件，可以去apache官網上去下載，然後放到WebRoot/WEB-INF/lib目錄下

upload.html

<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GBK"> <title>File upload</title> </head> <body>   <form name="myform" action="fileupload" method="post" enctype="multipart/form-data"> File: <input type="file" name="myfile"> <input type="submit" name="submit" value="Commit"> </form> </body> </html>

web.xml裡加上下面幾行：

<servlet> <servlet-name>Upload</servlet-name> <servlet-class>am.demo.Upload</servlet-class> </servlet> <servlet-mapping> <servlet-name>Upload</servlet-name> <url-pattern>/fileupload</url-pattern> </servlet-mapping>

src目錄下建立檔案Upload.java：

package am.demo;import java.io.File; import java.io.IOException; import java.util.Iterator; 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.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload;@SuppressWarnings("serial") public class Upload extends HttpServlet { private String uploadPath = "d://temp"; // 上傳檔案的目錄@SuppressWarnings("unchecked") public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { try { // Create a factory for disk-based file items DiskFileItemFactory factory = new DiskFileItemFactory();// Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(factory);List<FileItem> items = upload.parseRequest(request);// 得到所有的檔案 Iterator<FileItem> i = items.iterator(); while (i.hasNext()) { FileItem fi = (FileItem) i.next(); String fileName = fi.getName(); if (fileName != null) { File fullFile = new File(fi.getName()); File savedFile = new File(uploadPath, fullFile.getName()); fi.write(savedFile); } }response.setContentType("text/html;charset=GBK"); response.getWriter().print( "<mce:script language='javascript'></mce:script>"); } catch (Exception e) { // 可以跳轉出錯頁面 e.printStackTrace(); } }public void init() throws ServletException { File uploadFile = new File(uploadPath); if (!uploadFile.exists()) { uploadFile.mkdirs(); } } }

再看下載Downlaod.java:

package am.demo;import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;@SuppressWarnings("serial") public class Download extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {String aFileName = new String(request.getParameter("name").getBytes( "iso8859-1"), "gbk");File fileLoad = new File("d:/temp", aFileName);FileInputStream in = null; // 輸入資料流 OutputStream out = response.getOutputStream(); byte b[] = new byte[1024];try { response.setContentType("application/x-msdownload;");response.setHeader("Content-disposition", "attachment; filename=" + new String(aFileName.getBytes("GBK"), "ISO-8859-1"));// download the file. in = new FileInputStream(fileLoad); int n = 0; while ((n = in.read(b)) != -1) { out.write(b, 0, n); }} catch (Throwable e) { e.printStackTrace(); } finally { try { in.close(); out.close(); } catch (Throwable e) { e.printStackTrace(); } } }public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doGet(request, response); }}

刪除Delete.java:

package am.demo;import java.io.File; import java.io.FileNotFoundException; import java.io.IOException;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;@SuppressWarnings("serial") public class Delete extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response) throws FileNotFoundException, IOException {String aFileName = new String(request.getParameter("name").getBytes( "iso8859-1"), "gbk");File file = new File("d:/temp", aFileName);response.setContentType("text/html;charset=GBK");if (!file.isDirectory()) { file.delete(); response.getWriter().print( "<mce:script language='javascript'></mce:script>"); } else {}}public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doGet(request, response); } }

因為ubuntu server是黑屏，本人用的是ubuntu server10.04，不方便用瀏覽器來查看檔案，因為沒有圖形介面，也不方便調試，所以可以先在windows上測試通過，然後把相應檔案拷到ubuntu server中的tomcat相應目錄下，可以通過samba來傳檔案，但遇到一個問題，就是中文亂碼的問題，因為在開始安裝時，選的是英文，後面用網上的一些辦法，還是沒有解決中文亂碼的問題，有知道的大俠，還煩請轉告

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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