Java 如何将字节数组从Android设备发送到servlet

我需要从android设备向Servlet发送一些字节数组。为此，我尝试使用下一个代码：

Servlet:

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws 
ServletException, IOException {

  DataInputStream in = new DataInputStream((InputStream)request.getInputStream());
   response.setContentType("text/plain");
    byte[] buffer = new byte[1024];
    int len = 0;
    File file;
    file=new File(getServletContext().getRealPath("/POST_LOG!!!!.txt"));
    if(!file.exists()){
        file.createNewFile();
    }
    while ((len = in.read(buffer)) > 0) {
          FileOutputStream fos = new FileOutputStream(getServletContext().getRealPath("/POST_LOG!!!!.txt"), true);

           fos.write(buffer);            
           fos.close(); 
    }

    PrintWriter out = response.getWriter();
    out.write("Done");
    out.close();

HttpPost httpPost = new HttpPost(url);
    httpPost.setEntity(new InputStreamEntity(new MyInputStream(),
            4096 * 1024 * 10));
    HttpResponse response = null;

    try {
        response = httpClient.execute(httpPost);
    } catch (ClientProtocolException e) {
        e.printStackTrace();
        httpPost.abort();
    } catch (IOException e) {
        e.printStackTrace();
        httpPost.abort();
    }

设备端：

URL uploadUrl;
    try {
        uploadUrl = new URL(url);
        HttpURLConnection c = (HttpURLConnection) uploadUrl
                .openConnection();
        c.setRequestMethod("POST");

        c.setDoInput(true);
        c.setDoOutput(true);
        c.setUseCaches(false);
        c.connect();
        OutputStream out = c.getOutputStream();

        for (int i = 0; i < 1000; i++) { // generate random bytes for
                                            // uploading
            byte[] buffer = new byte[256];
            for (int j = 0; j < 256; j++) {
                Random r = new Random();
                buffer[j] = (byte) r.nextInt();
            }

            out.write(buffer);
            out.flush();
        }

        out.close();

    } catch (Exception e) {
        MessageBox("Error. " + e.toString());
    }

    return (long) 0;
}

URL上传URL；
试一试{
uploadUrl=新URL（URL）；
HttpURLConnection c=（HttpURLConnection）上传URL
.openConnection（）；
c、 setRequestMethod（“POST”）；
c、 setDoInput（true）；
c、 设置输出（真）；
c、 setUseCaches（假）；
c、 connect（）；
OutputStream out=c.getOutputStream（）；
对于（int i=0；i<1000；i++）{//为生成随机字节
//上传
字节[]缓冲区=新字节[256]；
对于（int j=0；j<256；j++）{
随机r=新随机（）；
缓冲区[j]=（字节）r.nextInt（）；
}
输出。写入（缓冲区）；
out.flush（）；
}
out.close（）；
}捕获（例外e）{
MessageBox（“Error.+e.toString（））；
}
返回（长）0；
}

---

我不明白为什么这个代码不起作用。当我尝试调试POST方法时，它甚至没有被调用。我将感谢您的示例

您有很多选择：

• 发送字节值：125,11,25,40（这是一个哑选项）
• 发送base64或十六进制编码，然后解码（使用apache commons编解码器）
• 以多部分/表单数据的形式提交

---

我找到了解决办法。我刚刚使用自定义InputStream更改了设备端代码
设备端：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws 
ServletException, IOException {

  DataInputStream in = new DataInputStream((InputStream)request.getInputStream());
   response.setContentType("text/plain");
    byte[] buffer = new byte[1024];
    int len = 0;
    File file;
    file=new File(getServletContext().getRealPath("/POST_LOG!!!!.txt"));
    if(!file.exists()){
        file.createNewFile();
    }
    while ((len = in.read(buffer)) > 0) {
          FileOutputStream fos = new FileOutputStream(getServletContext().getRealPath("/POST_LOG!!!!.txt"), true);

           fos.write(buffer);            
           fos.close(); 
    }

    PrintWriter out = response.getWriter();
    out.write("Done");
    out.close();

HttpPost httpPost = new HttpPost(url);
    httpPost.setEntity(new InputStreamEntity(new MyInputStream(),
            4096 * 1024 * 10));
    HttpResponse response = null;

    try {
        response = httpClient.execute(httpPost);
    } catch (ClientProtocolException e) {
        e.printStackTrace();
        httpPost.abort();
    } catch (IOException e) {
        e.printStackTrace();
        httpPost.abort();
    }

---

请共享您的web.xml servlet配置条目、URL映射以及用于调用它的servletn URL。