android 文件上传

public String postFile(String pathUrl, byte[] data) {
        StringBuilder sbuilder = new StringBuilder();
        try {
            URL url = new URL(pathUrl);
            HttpURLConnection httpConn = (HttpURLConnection) url
                    .openConnection();
            //设置连接属性
            httpConn.setDoOutput(true);// 使用 URL 连接进行输出
            httpConn.setDoInput(true);// 使用 URL 连接进行输入
            httpConn.setUseCaches(false);// 忽略缓存
            httpConn.setRequestMethod("POST");// 设置URL请求方法

            // 设置请求属性
            httpConn.setRequestProperty("Content-length", "" + data.length);
            httpConn.setRequestProperty("Content-Type",
                    "application/octet-stream");
            httpConn.setRequestProperty("Connection", "Keep-Alive");
            httpConn.setRequestProperty("Charset", "UTF-8");

            // 建立输出流，并写入数据
            OutputStream outputStream = httpConn.getOutputStream();
            outputStream.write(data);
            outputStream.close();
            
            // 获得响应状态
            RESPONSE_CODE = httpConn.getResponseCode();
            if (HttpURLConnection.HTTP_OK == RESPONSE_CODE) {
                String readLine;
                BufferedReader responseReader;
                // 处理响应流，必须与服务器响应流输出的编码一致
                responseReader = new BufferedReader(new InputStreamReader(
                        httpConn.getInputStream(), "UTF-8"));
                while ((readLine = responseReader.readLine()) != null) {
                    sbuilder.append(readLine);
                }
                responseReader.close();
            }
        } catch (Exception ex) {
            sbuilder.append(ex.getMessage());
            ex.printStackTrace();
        }
        return sbuilder.toString();
    }

 可以直接拷贝下来用。只要将File to byte[]：

    public static byte[] getBytesFromFile(File f){
        if(f==null)return null;
        try {
            FileInputStream stream = new FileInputStream(f);
            ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
            byte[] b = new byte[1024];
            for(int n;(n=stream.read(b))!=-1;){
                out.write(b,0,n);
            }
            stream.close();
            out.close();
            return out.toByteArray();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }