javaWEB

/**
 * 响应字节数据：设置字节数据的响应体
 */
@WebServlet("/resp4")
public class ResponseDemo4 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //1.读取文件
        FileInputStream fis = new FileInputStream("d//a.jpg");
        
        //2.获取response字节输出流
        ServletOutputStream os = response.getOutputStream();

        //3. 完成流得copy
        byte[] buff = new byte[1024];
        int len = 0;
        while((len = fis.read(buff)) != -1){
            os.write(buff,0,len);
        }
        
        fis.close();

    }