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#2
olkldksl2011-12-09 14:05
我用html写了一个下载的页面，然后调用一个servlet执行下载操作，你看看能帮上你吗
html页面： <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>下载页面</title> </head> <body> 请选择要下载的文件：<br/> <form action="/WEBTest/servlet/ServletDemo"> <input type="radio" name="file" value="1.jpg" >文件1<br/> <input type="radio" name="file" value="2.jpg">文件2<br/> <input type="submit" value="提交"> </form> </body> </html> servlet： public class ServletDemo extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //防止IE缓存 response.setHeader("pragma","no-cache"); response.setHeader("cache-control","no-cache"); response.setDateHeader("Expires",0); response.setHeader("content-disposition", "attachment;filename="); //设置编码 request.setCharacterEncoding("UTF-8"); String fileName = new String(request.getParameter("file").getBytes("ISO-8859-1"),"UTF-8"); //取到文件完整路径 String path = this.getServletContext().getRealPath(fileName); InputStream in = null; OutputStream out = null; //写缓冲区 try { in = new FileInputStream(path); out = response.getOutputStream(); int len = 0; byte[] buffer = new byte[1024]; while((len = in.read(buffer))>0){ out.write(buffer,0,len); } }finally{ if(in!=null) in.close(); if(out!=null) out.close(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } } |
程序代码：<%@ page contentType="text/html;charset=UTF-8" %>
<%@ page import = "*" %>
<%
//防止IE缓存
response.setHeader("pragma","no-cache");
response.setHeader("cache-control","no-cache");
response.setDateHeader("Expires",0);
//设置编码
//request.setCharacterEncoding("UTF-8");
String fileName = new String(request.getParameter("fileName").getBytes("ISO-8859-1"),"UTF-8");
//取到文件
File file = new File(application.getRealPath("/")+"upload/" + fileName);
response.reset();
//response.setContentType("application/octet-stream;charset=UTF-8");
response.setContentType("application/octet-stream;charset=UTF-8");//解决在弹出文件下载框不能打开文件的问题
//System.out.println(response.getCharacterEncoding());
//一定要对fileName进行encode
//response.addHeader("Content-Disposition", "attachment; filename=" + (fileName, "UTF-8"));
response.addHeader("Content-Disposition", "attachment; filename=" + new String(fileName.getBytes("GBK"),"ISO8859-1"));//解决在弹出文件下载框不能打开文件的问题
response.setContentLength((int) file.length());
byte[] buffer = new byte[4096];
BufferedOutputStream output = null;
BufferedInputStream input = null;
//写缓冲区
try {
output = new BufferedOutputStream(response.getOutputStream());
out.clear();
out = pageContext.pushBody();
input = new BufferedInputStream(new FileInputStream(file));
int n = (-1);
while ((n = input.read(buffer, 0, 4096)) > -1) {
output.write(buffer, 0, n);
}
response.flushBuffer();
}
catch (Exception e) {
}
finally {
if (input != null) input.close();
if (output != null) output.close();
}
%>
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[ 本帖最后由 sunpei 于 2011-12-9 13:03 编辑 ]