java servlet downLoadFile

javaDownLoadFile

//重设response
response.reset();
//设置要下载的文件content-Type
response.setContentType("application/x-msdownload");
//设置下载文件的名字
String fileName = (new File(filePath)).getName();
response.addHeader("Content-Disposition", "attachment; filename="+fileName);
//获取文件输入流
FileInputStream fileIn = new FileInputStream(filePath);
//获得输出流
OutputStream servletOS = response.getOutputStream();
//往输出流中写入数据
byte[] dataBtye = new byte[1024000];
int len = -1;
while((len = fileIn.read(dataBtye)) != -1){
  servletOS.write(dataBtye, 0, len);
}

servletOS.flush();
servletOS.close();
fileIn.close();