我使用以下代码在我的服务器上上传图像，它可以正常工作。但我想通过图像传递一些参数，我试图将“值”作为“测试”，但不起作用。
public int uploadFile(File selectedFile){
int serverResponseCode = 0;
HttpURLConnection connection;
DataOutputStream dataOutputStream;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
String selectedFilePath = selectedFile.getAbsolutePath();
int bytesRead,bytesAvailable,bufferSize;
byte[] buffer;
int maxBufferSize = 1024 * 1024;
if (!selectedFile.isFile()){
//dialog.dismiss();
return 0;
}else {
try{
FileInputStream fileInputStream = new FileInputStream(selectedFile);
URL url = new URL(ServerTools.SERVER+"profile/test.php");
connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);//Allow Inputs
connection.setDoOutput(true);//Allow Outputs
connection.setUseCaches(false);//Don't use a cached Copy
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("ENCTYPE", "multipart/form-data");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
connection.setRequestProperty("uploaded_file",selectedFilePath);
//creating new dataoutputstream
dataOutputStream = new DataOutputStream(connection.getOutputStream());
//writing bytes to data outputstream
dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
+ selectedFilePath + "\"" + lineEnd);
dataOutputStream.writeBytes(lineEnd);
//returns no. of bytes present in fileInputStream
bytesAvailable = fileInputStream.available();
//selecting the buffer size as minimum of available bytes or 1 MB
bufferSize = Math.min(bytesAvailable,maxBufferSize);
//setting the buffer as byte array of size of bufferSize
buffer = new byte[bufferSize];
//reads bytes from FileInputStream(from 0th index of buffer to buffersize)
bytesRead = fileInputStream.read(buffer,0,bufferSize);
//loop repeats till bytesRead = -1, i.e., no bytes are left to read
while (bytesRead > 0){
//write the bytes read from inputstream
dataOutputStream.write(buffer,0,bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable,maxBufferSize);
bytesRead = fileInputStream.read(buffer,0,bufferSize);
}
//PARAMS!!!
dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"value\"" + lineEnd);
dataOutputStream.writeBytes(lineEnd);
dataOutputStream.writeBytes("test" + lineEnd);
dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
dataOutputStream.writeBytes(lineEnd);
dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
serverResponseCode = connection.getResponseCode();
String serverResponseMessage = connection.getResponseMessage();
BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
StringBuilder responseOutput = new StringBuilder();
while ((line = br.readLine()) != null) {
responseOutput.append(line);
}
br.close();
Log.i("Test", "Server Response is: " + serverResponseMessage + ": " + serverResponseCode+ " -> "+responseOutput);
//closing the input and output streams
fileInputStream.close();
dataOutputStream.flush();
dataOutputStream.close();
}catch (Exception e){
e.printStackTrace();
}
}
return serverResponseCode;
}
我的php服务器很简单：
<?php
$wp = $_FILES['uploaded_file']['tmp_name'];
move_uploaded_file($wp,"test.jpg");
echo "value: ".$_POST["value"];
?>
但Log.d打印：Server Response is: OK: 200 -> value:
如何正确传递一些参数？
答案 0 :(得分：1)
您可以使用下面的类简单地将文件部分与文本部分放在一起。
String charset = "UTF-8";
String requestURL = BASE_URL + "userregistration";
MultipartUtility multipart = new MultipartUtility(requestURL, charset);
multipart.addFormField("username", userJid);
multipart.addFilePart("image", imageBitmap);//ima
String response = multipart.finish();
Log.d("SERVER REPLIED", response);
您可以创建一个MultipartUtility类，如下所示 -
public class MultipartUtility {
private final String boundary;
private static final String LINE_FEED = "\r\n";
private HttpURLConnection httpConn;
private String charset;
private OutputStream outputStream;
private PrintWriter writer;
/**
* This constructor initializes a new HTTP POST request with content type
* is set to multipart/form-data
*
* @param requestURL
* @param charset
* @throws IOException
*/
public MultipartUtility(String requestURL, String charset)
throws IOException {
this.charset = charset;
boundary = "===" + System.currentTimeMillis() + "===";
URL url = new URL(requestURL);
httpConn = (HttpURLConnection) url.openConnection();
httpConn.setUseCaches(false);
httpConn.setDoOutput(true); // indicates POST method
httpConn.setDoInput(true);
httpConn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundary);
httpConn.setRequestProperty("api_key", "a05f9ece-cd34-11e4-afdc-1681e6b88ec1");
outputStream = httpConn.getOutputStream();
writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
true);
}
/**
* Adds a form field to the request
*
* @param name field name
* @param value field value
*/
public void addFormField(String name, String value) {
writer.append("--").
append(boundary).
append(LINE_FEED).
append("Content-Disposition: form-data; name=\"").
append(name).append("\"").
append(LINE_FEED).
append("Content-Type: text/plain; charset=").
append(charset).append(
LINE_FEED);
writer.append(LINE_FEED);
writer.append(value).append(LINE_FEED);
writer.flush();
}
/**
* Adds a upload file section to the request
*
* @param fieldName name attribute in <input type="file" name="..." />
* @param fileBytes a File to be uploaded
* @throws IOException
*/
public void addFilePart(String fieldName, byte[] fileBytes)
throws IOException {
// String fileName = uploadFile.getName();
writer.append("--")
.append(boundary)
.append(LINE_FEED)
.append("Content-Disposition: form-data; name=\"")
.append(fieldName)
.append("\"; filename=\"")
.append("user.jpeg")
.append("\"")
.append(LINE_FEED)
.append("Content-Type: image/jpeg")
.append(LINE_FEED)
.append("Content-Transfer-Encoding: binary")
.append(LINE_FEED)
.append(LINE_FEED);
writer.flush();
ByteArrayInputStream inputStream = new ByteArrayInputStream(fileBytes);
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
outputStream.flush();
inputStream.close();
writer.append(LINE_FEED);
writer.flush();
}
/**
* Adds a header field to the request.
*
* @param name - name of the header field
* @param value - value of the header field
*/
public void addHeaderField(String name, String value) {
writer.append(name).append(": ").append(value).append(LINE_FEED);
writer.flush();
}
/**
* Completes the request and receives response from the server.
*
* @return a list of Strings as response in case the server returned
* status OK, otherwise an exception is thrown.
* @throws IOException
*/
public String finish() throws IOException {
writer.append(LINE_FEED).flush();
writer.append("--")
.append(boundary)
.append("--")
.append(LINE_FEED)
.close();
String data = "";
int status = httpConn.getResponseCode();
if (status == HttpURLConnection.HTTP_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(
httpConn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
data = data + line;
}
reader.close();
httpConn.disconnect();
} else {
throw new IOException("Server returned non-OK status: " + status);
}
return data.isEmpty() ? null : data;
}
}
答案 1 :(得分：0)
我的文件标题工作代码的一部分，只需检查/尝试是否适用于您
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name=\"" + jsonField + "\"; filename=\"" + q[jsonName] + "\"" + lineEnd);
outputStream.writeBytes("Content-Type: " + "application/json" + lineEnd);
outputStream.writeBytes("Content-Transfer-Encoding: binary" + lineEnd);
outputStream.writeBytes(lineEnd);