JSP servlet实现文件上传下载和删除

2019-10-27 17:54:01

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本文实例为大家分享了Android九宫格图片展示的具体代码，供大家参考，具体内容如下

由于存储空间，对一般用户而言，就是用来操作存储文件的，所以这两天，特意看了一下windows下用servlet实现文件上传、下载和删除，下面是详细代码说明

上传：

用的是commons-fileupload-1.2.2.jar和commons-io-2.0.1.jar组件，可以去apache官网上去下载，然后放到WebRoot/WEB-INF/lib目录下

upload.html

 <html> <head>   <meta http-equiv="Content-Type" content="text/html; charset=GBK">   <title>File upload</title> </head> <body> <!-- action="fileupload"对应web.xml中<servlet-mapping>中<url-pattern>的设置.--> <!-- 必须是multipart的表单数据,才能完整的传递文件数据 -->   <form name="myform" action="fileupload" method="post"     enctype="multipart/form-data">     File:<br>     <input type="file" name="myfile"><br>     <br>     <input type="submit" name="submit" value="Commit">   </form> </body> </html>

web.xml里加上下面几行：

<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目录下新建文件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"; // 上传文件的目录    @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);// 得到所有的文件       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'><!-- alert('上传成功');window.location.href='index.jsp'; // --></mce:script>");     } catch (Exception e) {       // 可以跳转出错页面       e.printStackTrace();     }   }    public void init() throws ServletException {     File uploadFile = new File(uploadPath);     if (!uploadFile.exists()) {       uploadFile.mkdirs();     }   } }

再看下载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; // 输入流     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);   }  }

删除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'><!-- alert('删除成功');window.location.href='index.jsp'; // --></mce:script>");     } else {      }    }    public void doPost(HttpServletRequest request, HttpServletResponse response)       throws IOException, ServletException {     doGet(request, response);   } }

因为ubuntu server是黑屏，本人用的是ubuntu server10.04，不方便用浏览器来查看文件，因为没有图形界面，也不方便调试，所以可以先在windows上测试通过，然后把相应文件拷到ubuntu server中的tomcat相应目录下，可以通过samba来传文件，但遇到一个问题，就是中文乱码的问题，因为在开始安装时，选的是英文，后面用网上的一些办法，还是没有解决中文乱码的问题，有知道的大侠，还烦请转告。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持CuoXin错新网。

注：相关教程知识阅读请移步到JSP教程频道。

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