JSP文件下载

JSP工具之，文件下载

<%
String filePath = request.getParameter("filePath");
filePath = URLDecoder.decode(filePath, "UTF-8");
String fileName = request.getParameter("fileName");
fileName = URLDecoder.decode(filePath, "UTF-8");
out.clear();
if(filePath==null || "".equals(filePath)){
	response.getWriter().write("{success:false}");
}else{
	File downFile = new File(filePath);
	if(downFile.exists() && downFile.isFile()){
	String mimeType = null;//媒体类型
	boolean isInline = false;//是否要在浏览器打开
	mimeType = application.getMimeType(filePath);
	if(mimeType==null)
		mimeType = "application/octet-stream;charset=iso8859-1";
	response.setContentType(mimeType);
	String ua = request.getHeader("User-Agent");//获取终端类型
	if(ua==null)
		ua = "User-Agent:Mozilla/4.0(compatible;MSIE 6.0;)";
	boolean isIE = ua.toLowerCase().indexOf("msie")!=-1;
	if(isIE && ! isInline){
		mimeType = "application/x-msdownload";   
	}
	String downFileName = new String(fileName.getBytes(),"iso8859-1");   
	String inlineType = isInline ? "inline" : "attachment";
	response.setHeader("Content-Disposition", inlineType+";filename=\""+downFileName+"\"");
	response.setContentLength((int) downFile.length());
	byte[] buffer = new byte[4096];
	BufferedOutputStream output = null;
	BufferedInputStream input = null;
		try{
			output = new BufferedOutputStream(response.getOutputStream());
			input = new BufferedInputStream(new FileInputStream(downFile));
			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();
		}
	}else{
		response.getWriter().write("{\"success\":false}");
	}
}%> //这里不能换行，否者会报错，原因解析的时候会当初输出流