java web实用文件下载(包括中文文件名乱码处理)

java web应用文件下载(包括中文文件名乱码处理) .
Java web下载文件功能的确很简单。如下代码片段 
Java web下载文件功能的确很简单。如下代码片段
view plaincopy to clipboardprint?
01.String fileName ="...."; 
02.response.setHeader("Content-disposition","attachment; filename="+fileName); 
03.//response.setContentType("application/ms-word");  
04. 
05.BufferedInputStream bis = null; 
06.BufferedOutputStream bos = null; 
07.    try { 
08.        bis = new BufferedInputStream(new FileInputStream(getServletContext().getRealPath("" + fileName))); 
09.        bos = new BufferedOutputStream(response.getOutputStream()); 
10. 
11.        byte[] buff = new byte[2048]; 
12.        int bytesRead; 
13. 
14.        while(-1 != (bytesRead = bis.read(buff, 0, buff.length))) { 
15.            bos.write(buff,0,bytesRead); 
16.        } 
17. 
18.    } catch(final IOException e) { 
19.        System.out.println ( "IOException." + e ); 
20. 
21.    } finally { 
22.        if (bis != null) 
23.            bis.close(); 
24.        if (bos != null) 
25.            bos.close(); 
26.    } 
String fileName ="....";
response.setHeader("Content-disposition","attachment; filename="+fileName);
//response.setContentType("application/ms-word");

BufferedInputStream bis = null;
BufferedOutputStream bos = null;
    try {
        bis = new BufferedInputStream(new FileInputStream(getServletContext().getRealPath("" + fileName)));
        bos = new 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(final IOException e) {
        System.out.println ( "IOException." + e );

    } finally {
        if (bis != null)
            bis.close();
        if (bos != null)
            bos.close();
    }


如上所示，已经可以完成下载的功能。不过如果我们使用中文文件名，那么这段代码便会出错，解决办法有多种方式，如下：

第一种： 设置  response.setHeader("Content-Disposition", "attachment; filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));这里将文件名编码成UTF-8的格式，就不会出现URL出错了。IE6下注意中文文字不能超过超过17个。

第二种：设置response.setHeader( "Content-Disposition", "attachment;filename="  + new String( fileName.getBytes("gb2312"), "ISO8859-1" ) );将中文名编码为ISO8859-1的方式。不过该编码只支持简体中文.

按照上诉方式，可以综合一下两种方式解决绝大部分中文问题。

fileName = URLEncoder.encode(fileNameSrc,"UTF-8");

if(fileName.length()>150)//解决IE 6.0 bug

      fileName=new String(fileNameSrc.getBytes("GBK"),"ISO-8859-1");

response.setHeader( "Content-Disposition", "attachment;filename="  + fileName);