Java 如何在android中通过文件上传发送常规post键/值对
我有一个通过post上传照片的功能。我可以很好地上传文件,但不确定如何添加更多的键/值对来发布,基本上我需要随文件数据提供一个API键和会话键,方法如下所示Java 如何在android中通过文件上传发送常规post键/值对,java,android,api,file-upload,Java,Android,Api,File Upload,我有一个通过post上传照片的功能。我可以很好地上传文件,但不确定如何添加更多的键/值对来发布,基本上我需要随文件数据提供一个API键和会话键,方法如下所示 public ContainerData submitPhoto(FileInputStream fileInputStream, String sessionKey) { try { URL url = new URL(API_URL); HttpURLConnection conn = nu
public ContainerData submitPhoto(FileInputStream fileInputStream, String sessionKey) {
try {
URL url = new URL(API_URL);
HttpURLConnection conn = null;
if (url.getProtocol().toLowerCase().equals("https")) {
trustAllHosts();
HttpsURLConnection https = (HttpsURLConnection) url.openConnection();
https.setHostnameVerifier(DO_NOT_VERIFY);
conn = https;
} else {
conn = (HttpURLConnection) url.openConnection();
}
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
// HttpURLConnection conn = (HttpURLConnection)
// connectURL.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + "file.png" + "\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
int bytesAvailable = fileInputStream.available();
int maxBufferSize = 1028;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);
byte[] buffer = new byte[bufferSize];
// read file and write it into form...
int bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
/*
* dos.writeBytes(lineEnd); dos.writeBytes(twoHyphens + boundary
* + twoHyphens + lineEnd);
*/
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
dos.flush();
// Log.d(TAG, " dos5: " + dos.toString());
InputStream is = conn.getInputStream();
// retrieve the response from server
int ch;
StringBuffer b = new StringBuffer();
while ((ch = is.read()) != -1) {
b.append((char) ch);
}
String stringResponse = b.toString();
// Log.d(TAG, "http response for upload" + s);
dos.close();
Gson gson = new GsonBuilder().serializeNulls().create();
responseObject = gson.fromJson(stringResponse,ContainerData.class);
JSONObject data = new JSONObject(stringResponse);
String dataResponse = data.getString("data");
responseObject.setDataString(dataResponse);
} catch (JSONException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return responseObject;
}
指定格式。从链接:
Content-type: multipart/form-data, boundary=AaB03x
--AaB03x
content-disposition: form-data; name="field1"
Joe Blow
--AaB03x
content-disposition: form-data; name="pics"; filename="file1.txt"
Content-Type: text/plain
... contents of file1.txt ...
--AaB03x--
您的代码还有两个问题:
1) 我发现在每次迭代时重新创建缓冲区既麻烦又缓慢。只需在循环之前将其调暗到最大大小,然后重新使用即可
2) 另外,直接发送数据字节可能会有风险(如果图片的两个字节的值与分隔符的值相同怎么办?我建议使用base64编码。指定格式。从链接:
Content-type: multipart/form-data, boundary=AaB03x
--AaB03x
content-disposition: form-data; name="field1"
Joe Blow
--AaB03x
content-disposition: form-data; name="pics"; filename="file1.txt"
Content-Type: text/plain
... contents of file1.txt ...
--AaB03x--
您的代码还有两个问题:
1) 我发现在每次迭代时重新创建缓冲区既麻烦又缓慢。只需在循环之前将其调暗到最大大小,然后重新使用即可
2) 另外,直接发送数据字节可能有风险(如果图片中的两个字节的值与分隔符的值相同怎么办?我建议使用base64编码