jsp中使用二进制流下载文件

<%

String para = request.getParameter("id");

//避免中文乱码

para = new String(para.getBytes("ISO8859-1"), "UTF-8");

//文件路径

String filePath = "D:/BackupFile/" + para + ".zip";

//文件下载后保存的名字，后缀.zip表名文件格式

String displayName = para + ".zip";

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

//设置下载文件保存名称

response.addHeader("Content-Disposition", "attachment;filename="

+ displayName);

try {

response.setHeader("Cache-Control", "no_cache");

       response.setHeader("Pragma", "no_cache");

response.setHeader("Content-Transfer-Encoding", "binary");

response.setContentType("application/octet-stream");

OutputStream write = response.getOutputStream();

byte buffer[] = new byte[4096];

FileInputStream read = new FileInputStream(filePath);

            int size;

            while (( size = read.read(buffer) ) != -1) {

                write.write(buffer, 0, size);

            }

            write.close();

response.flushBuffer();

} catch (Exception e) {

e.printStackTrace();

}

%>