回显主页和favorite、主页中有img图片标签

/**
     * 解析封装为一个request对象
     * @param s
     * @return
     */
    private static Request parseRequest(String s){
        Request req = new Request();
        String[] split = s.split("\r\n");
        String[] spl = split[0].split(" ");
        req.setMethod(spl[0]);
        req.setUri(spl[1]);
        return req;
    }

public static void main(String[] args) throws IOException {
        byte b = 0x3f;
        byte2Hex(b);
        ServerSocket server = new ServerSocket(8080);
        System.out.println("服务器已经启动，监听端口在8080...");
        while (true){
            Socket socket = server.accept();
            InputStream is = socket.getInputStream();
            OutputStream os = socket.getOutputStream();
            byte[] buf = new byte[1024*1024];
            new Thread(new Runnable() {
                @Override
                public void run() {
                    int len = 0;
                    try {
                        len = is.read(buf);
                        if (len == -1) return;
                        System.out.println("读到的字节数量是："+len);
                        String hexMsg = byteArr2HexStr(buf, len);
                        System.out.println(hexMsg);
                        String s = new String(buf,0,len);
                        System.out.println(s);
                        Request request = parseRequest(s);
                        // HTTP1.1协议 状态码200 正确 回车换行
                        String line1 = "HTTP/1.1 200 OK\r\n";
                        // 内容的类型是普通文本，回车换行
                        String line2 = "Content-Type:text/plain\r\n";
                        // 回车换行
                        final String line3 = "\r\n";
                        String file = null;
                        if (request.getUri().equals("/") || request.getUri().equals("/index.html")){
                            line2 = "Content-Type:text/html\r\n";
                            file = "index.html";
                        }
                        // 固定的响应三行
                        os.write(line1.getBytes());
                        os.write(line2.getBytes());
                        os.write(line3.getBytes());
                        // 如果file不为空，说明需要回文件给浏览器
                        if (file != null){
                            FileInputStream fis = new FileInputStream(file);
                            while ((len=fis.read(buf)) !=-1){
                                os.write(buf,0,len);
                            }
                        }else {
                            // 返回浏览器的文本内容
                            os.write((""+count).getBytes());
                            count++;
                        }
                        // 主动刷新一次
                        os.flush();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }finally {
                        if (socket != null){
                            try {
                                // 关闭资源
                                socket.close();
                            }catch (IOException e){
                                e.printStackTrace();
                            }
                        }
                    }
                }
            }).start();
        }
    }

if (request.getUri().equals("/") || request.getUri().equals("/index.html")){
                            line2 = "Content-Type:text/html\r\n";
                            file = "index.html";
                        }else if (request.getUri().equals("favicon.ioc")){
                            line2 = "Content-Type:image/x-icon\r\n";
                            file = "favicon.ico";
                        }else if (request.getUri().endsWith(".jsp") || request.getUri().endsWith("jpeg")){
                            line2 = "Content-Type:image/jpeg\r\n";
                            // 过滤首字母/
                            file = request.getUri().substring(1);
                        }