文件下载Servlet
实现文件下载servlet步骤
- 获取下载文件的路径
- 下载的文件名是什么
- 设置想办法让浏览器能够支持下载我们需要的东西
- 获取下载文件的输入流
- 创建缓冲区
- 获取OutputStream对象
- 将FileInputStream流写入到buffer缓冲区
- 使用OutputStream将缓冲区中的数据输出到客户端!
public class FileServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String realPath = "E:\\javacode\\javaweb-02-servlet\\response\\src\\main\\resources\\son.png";
System.out.println("下载文件的路径:"+realPath);
String fileName = realPath.substring(realPath.lastIndexOf("\\") + 1);
resp.setHeader("Content-Disposition","attachment;filename="+fileName);
FileInputStream in = new FileInputStream(realPath);
int len = 0;
byte[] buffer = new byte[1024];
ServletOutputStream out = resp.getOutputStream();
while ((len=in.read(buffer))>0){
out.write(buffer,0,len);
}
in.close();
out.close();
}