Java HTTP 服务器和资源

Question

我正在使用 NanoHTTPd 从我的 Android 应用程序提供文件。我可以很好地打开 .html 文件，但它正在尝试查看图像，这就是问题所在。不显示网页背景图片之类的内容。

有人有这方面的示例代码吗？我知道 nanoHTTPd 可以做到这一点。我在 Android 和 Java 方面有很多经验，但这是我第一次使用服务器。

private class MyHTTPD extends NanoHTTPD {
    public MyHTTPD() throws IOException {
        super(PORT, null);
    }

    @Override
    public Response serve(String uri, String method, Properties header, Properties parms, Properties files) {
        Log.d("response", "URI:" + uri + " method: " + method + " header: " + header + " parms: " + parms + " files: " + files);
        final StringBuilder buf = new StringBuilder();
        for (Entry<Object, Object> kv : header.entrySet())
            buf.append(kv.getKey() + " : " + kv.getValue() + "\n");
        handler.post(new Runnable() {
            @Override
            public void run() {
                hello.setText(buf);
            }
        });

        String html = null;
        InputStream is = null;
        if (uri.length() > 3) {
            // respond with resource or sub page

            // serve image?
            if (uri.substring(uri.lastIndexOf("."), uri.length()).equals(".jpg")) {
                try {
                    is = new FileInputStream(Environment.getExternalStorageDirectory().getPath() + "/WiFile" + uri);
                    Log.d("Serve", "image: " + Environment.getExternalStorageDirectory().getPath() + "/WiFile" + uri);
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            } else {
                //serve page
                try {
                    is = new FileInputStream(Environment.getExternalStorageDirectory().getPath() + "/WiFile" + uri);
                    Log.d("response subpage", Environment.getExternalStorageDirectory().getPath() + "/WiFile" + uri);
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        } else {
            // respond with index
            try {
                is = new FileInputStream(Environment.getExternalStorageDirectory().getPath() + "/WiFile/" + "index.html");
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            Log.d("response index", Environment.getExternalStorageDirectory().getPath() + "/WiFile/" + "index.html");
        }

        byte[] b;
        try {
            b = new byte[is.available()];
            is.read(b);
            html = new String(b);
        } catch (IOException e) { // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return new NanoHTTPD.Response(HTTP_OK, MIME_HTML, html);
    }
}

编辑:

在浏览器中打开图像只会返回大量文本符号(...��k�OOO�...)。我是否以错误的方式解析图像？

修复:

就像古斯塔夫说的，我没有使用正确的模因类型，但我也没有返回 serveFile(.....) 例如.....

// serve image?
            if (uri.substring(uri.lastIndexOf("."), uri.length()).equals(".jpeg")) {
                try {
                    is = new FileInputStream(Environment.getExternalStorageDirectory().getPath() + "/WiFile" + uri);
                    mimeType = "image/jpeg";
                    Log.d("Serve", "image: " + Environment.getExternalStorageDirectory().getPath() + "/WiFile" + uri);
                    return serveFile(uri, header, new File(Environment.getExternalStorageDirectory().getPath() + "/WiFile"), true);
                } catch (FileNotFoundException e) {}
            } else {
                //serve page
                try {
                    is = new FileInputStream(Environment.getExternalStorageDirectory().getPath() + "/WiFile" + uri);
                    mimeType = MIME_HTML;
                    Log.d("response subpage", Environment.getExternalStorageDirectory().getPath() + "/WiFile" + uri);
                    return serveFile(uri, header, new File(Environment.getExternalStorageDirectory().getPath() + "/WiFile"), true);
                } catch (FileNotFoundException e) {}
            }
        } else {
            // respond with index
            try {
                is = new FileInputStream(Environment.getExternalStorageDirectory().getPath() + "/WiFile/" + "index.html");
                mimeType = MIME_HTML;
                Log.d("response index", Environment.getExternalStorageDirectory().getPath() + "/WiFile/" + "index.html");
                return serveFile(uri, header, new File(Environment.getExternalStorageDirectory().getPath() + "/WiFile"), true);
            } catch (FileNotFoundException e) {}
        }

Answer 1

您将 MIME_HTML 传递给 Response 构造函数，而不管您要作为有效负载发送什么。参数是一个String，所以试试

return new NanoHTTPD.Response(HTTP_OK, "image/jpeg", html);

提供 (JPEG) 图片时。