文件下载

public class HelloServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //设置浏览器响应的mime类型
        response.setContentType("application/msword");
　　　　 //从服务器中获取要下载的文件的路径
        String realPath = getServletContext().getRealPath("/error/myword.docx");
        File file = new File(realPath);

        try {
　　　　　　　//获取该文件的输入流
            FileInputStream inputStream = new FileInputStream(file);

            //通过response获取ServletOutputStream对象(out)
            ServletOutputStream outputStream = response.getOutputStream();
　　　　　　　//通过字节流的方式将文件写会浏览器
            int b = 0;
            byte[] buffer = new byte[1024];
            while (b != -1){
                b = inputStream.read(buffer);
                //写到输出流(out)中
                outputStream.write(buffer,0,b);
            }
            inputStream.close();
            outputStream.close();
            outputStream.flush();

        } catch (IOException e) {
            e.printStackTrace();
        }


    }
}