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String path=request.getParameter("path");//从页面获取要下载的文件的相对路径
if(!"".equals(path)){
path=new String(path.getBytes("ISO-8859-1"),"UTF-8");
File file=new File(getServletContext().getRealPath("/")+path);//构造要下载的文件
if(file.exists()){
InputStream ins=new FileInputStream(getServletContext().getRealPath("/")+path);//构造一个读取文件的IO流对象
BufferedInputStream bins=new BufferedInputStream(ins);//放到缓冲流里面
OutputStream outs=response.getOutputStream();//获取文件输出IO流
BufferedOutputStream bouts=new BufferedOutputStream(outs);
response.setContentType("application/x-download");//设置response内容的类型
response.setHeader("Content-disposition","attachment;filename="+ URLEncoder.encode(path, "UTF-8"));//设置头部信息
int bytesRead = 0;
byte[] buffer = new byte[8192];
//开始向网络传输文件流
while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {
bouts.write(buffer, 0, bytesRead);
}
bouts.flush();//这里一定要调用flush()方法
ins.close();
bins.close();
outs.close();
bouts.close();
}else{
System.out.println("下载的文件不存在");
}
}else{
System.out.println("下载文件时参数错误");
}