jspSmartUpload上传、下载

 

 一：上传

  1：在jsp页面的form表单中一定要加(ENCTYPE="multipart/form-data"),并且方法为post!     

  2：servlet      

 

 response.setContentType("text/html;charset=utf-8");
       PrintWriter out = response.getWriter();
       SmartUpload mySmartUpload = new SmartUpload();
 
       try {
           //1:初始化,有两种方式
           //initialize(pageContext)
           //initialize(servletConfig,request,response);
           mySmartUpload.initialize(config,request,response);         
           //2:准备上传
           mySmartUpload.upload();
           // 上传文件个数
com.jspsmart.upload.File myFile = mySmartUpload.getFiles().getFile(0);
           //3:上传
           myFile.saveAs("/" + myFile.getFileName());
 
           out.print("上传成功");
       } catch (Exception e) {
           out.println("Error : " + e.toString());
}

 一些扩展方法

//设置单个文件大小
mySmartUpload.setMaxFileSize(100000);             
//设置总的上传文件大小
mySmartUpload.setTotalMaxFileSize(20000);   
//设置允许上传的文件格式
mySmartUpload.setAllowedFilesList("jpg,gif,png");
//获取单个文件
File file=su.getFiles().getFile(0); (Files对象保存了上传的所有文件)

  我们可以通过下面的方法得到config

 

 

private ServletConfig config;
 
final public void init(ServletConfig config) throws ServletException        {
    this.config = config;
}

这里是得到pageContext

 

 

PageContext pageContext = JspFactory.getDefaultFactory().getPageContext(this, request, response, null, true,8192, true);

二：下载      

 

 

SmartUpload su = new SmartUpload();
          
           su.initialize(pageContext);
          
           // 设定contentDisposition为null以禁止浏览器自动打开文件，
           //保证点击链接后是下载文件。若不设定，则下载的文件扩展名为
           //doc时，浏览器将自动用word打开它。扩展名为pdf时，
           //浏览器将用acrobat打开。
           su.setContentDisposition(null);
          
           //开始下载
           su.downloadFile("xml\\"+filename); 

 三：下载、上传中文乱码问题

 

这个问题有高人给出了解决方案

 

 /*jspSmartUpload虽然能下载文件，但对中文支持不足。若下载的文件名中有汉字，则浏览器在提示另存的文件名时，显示的是一堆乱码，很扫人兴。上面的例子就是这样。（这个问题也是众多下载组件所存在的问题，很少有人解决，搜索不到相关资料，可叹！）
 
    为了给jspSmartUpload组件增加下载中文文件的支持，我对该组件进行了研究，发现对返回给浏览器的另存文件名进行UTF-8编码后，浏览器便能正确显示中文名字了。这是一个令人高兴的发现。于是我对jspSmartUpload组件的SmartUpload类做了升级处理，增加了toUtf8String这个方法，改动部分源码如下：*/
public void downloadFile(String s, String s1, String s2, int i)
     throws ServletException, IOException, SmartUploadException
     {
     if(s == null)
         throw new IllegalArgumentException("File '" + s +
         "' not found (1040).");
     if(s.equals(""))
         throw new IllegalArgumentException("File '" + s +
         "' not found (1040).");
     if(!isVirtual(s) && m_denyPhysicalPath)
         throw new SecurityException("Physical path is
         denied (1035).");
     if(isVirtual(s))
         s = m_application.getRealPath(s);
     java.io.File file = new java.io.File(s);
     FileInputStream fileinputstream = new FileInputStream(file);
     long l = file.length();
     boolean flag = false;
     int k = 0;
     byte abyte0[] = new byte[i];
     if(s1 == null)
         m_response.setContentType("application/x-msdownload");
     else
     if(s1.length() == 0)
         m_response.setContentType("application/x-msdownload");
     else
         m_response.setContentType(s1);
     m_response.setContentLength((int)l);
     m_contentDisposition = m_contentDisposition != null ?
     m_contentDisposition : "attachment;";
     if(s2 == null)
         m_response.setHeader("Content-Disposition",
         m_contentDisposition + " filename=" +
         toUtf8String(getFileName(s)));
     else
     if(s2.length() == 0)
         m_response.setHeader("Content-Disposition",
         m_contentDisposition);
     else
         m_response.setHeader("Content-Disposition",
         m_contentDisposition + " filename=" + toUtf8String(s2));
     while((long)k < l)
     {
         int j = fileinputstream.read(abyte0, 0, i);
         k += j;
         m_response.getOutputStream().write(abyte0, 0, j);
     }
     fileinputstream.close();
     }
 
     /**
      * 将文件名中的汉字转为UTF8编码的串,以便下载时能正确显示另存的文件名.
      * 纵横软件制作中心雨亦奇2003.08.01
      * @param s 原文件名
      * @return 重新编码后的文件名
      */
     public static String toUtf8String(String s) {
     StringBuffer sb = new StringBuffer();
     for (int i=0;i<s.length();i++) {
         char c = s.charAt(i);
         if (c >= 0 && c <= 255) {
         sb.append(c);
         } else {
         byte[] b;
         try {
             b = Character.toString(c).getBytes("utf-8");
         } catch (Exception ex) {
             System.out.println(ex);
             b = new byte[0];
         }
         for (int j = 0; j < b.length; j++) {
             int k = b[j];
             if (k < 0) k += 256;
             sb.append("%" + Integer.toHexString(k).
             toUpperCase());
         }
         }
     }
     return sb.toString();
     }

 四：下面是个牛人给的例子，据说能解决所有上传、下载过程中的乱码问题

 

上传：

upload.jsp

<%@ page contentType="text/html; charset=gb2312" %>
<%
 request.setCharacterEncoding("gb2312"); // 这句话很重要，否则遇到中文就出错~
%>
<HTML>
<HEAD><TITLE>上传</TITLE>
<META content="text/html; charset=gb2312" http-equiv=Content-Type>
</HEAD>
<BODY leftMargin=0 topMargin=0>
   <FORM action="upload_ok.jsp" method=post name="Upload" enctype="multipart/form-data">
     <input type="file" name="file" >
    </FORM>
</td>
  </tr>
</table>
</BODY></HTML>

upload_ok.jsp

<%@ page contentType="text/html;charset=gb2312" %>
<%@ page import="com.jspsmart.upload.*" %>
<HTML><HEAD><TITLE>上传成功!</TITLE>
<META content="text/html; charset=gb2312" http-equiv=Content-Type>
</HEAD>
<BODY leftMargin=0 topMargin=0>
<jsp:useBean id="mySmartUpload" scope="page" class="com.jspsmart.upload.SmartUpload" />
<table width="80%"  border="0" cellpadding="0" cellspacing="0" bgcolor="#DEE7EF">
  <tr>
    <td align="center">
<%
 int count=0;
 String fileName = null;
 mySmartUpload.initialize(pageContext);
 mySmartUpload.upload();
 com.jspsmart.upload.File myFile = mySmartUpload.getFiles().getFile(0);
 if (!myFile.isMissing()) {
  //String ext=myFile.getFileExt();//得到后缀  
  fileName = myFile.getFileName();
  myFile.saveAs("/files/" + fileName);//你要存放文件所在文件夹的相对路径
     out.println("文件:<b>"+fileName+"</b>上传成功!<br>文件大小:" + myFile.getSize() + "kb<BR>");
     }
%>
</BODY></HTML>

下载：

文件的超连接写法范例:
<% String fname ="中文测试.xsl"; //假设你的文件名是:中文测试.xsl
%>
<A target="_blank" href="Download.jsp?filename=<%=fname%>">下 载</A>
文件的超连接写法范例-2 重新用utf-8对文件名编码:
<%@ page contentType="text/html;charset=gb2312" session="true"%>
<%  String name=java.net.URLEncoder.encode("世界文化.doc","UTF-8");%>  <a href="c:\<%=name%>">世界文化.doc</a>

 Download.jsp

<%
  java.io.BufferedInputStream bis=null;
  java.io.BufferedOutputStream  bos=null;
try{
 String filename=request.getParameter("filename");
             filename=new String(filename.getBytes("iso8859-1"),"gb2312");
 response.setContentType("application/x-msdownload");
 response.setHeader("Content-disposition","attachment; filename="+new String(filename.getBytes("gb2312"),"iso8859-1"));
 bis =new java.io.BufferedInputStream(new java.io.FileInputStream(config.getServletContext().getRealPath("files/" + filename)));
 bos=new java.io.BufferedOutputStream(response.getOutputStream());
 byte[] buff = new byte[2048];
 int bytesRead;
 while(-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
  bos.write(buff,0,bytesRead);
 }
}
catch(Exception e){
 e.printStackTrace();
}
finally {
 if (bis != null)bis.close();
 if (bos != null)bos.close();
}
%>