我想上传图片及其信息。我想使用 multipart / form 数据json for android。我也看到了这个Stack Overflow问题Android:How to upload .mp3 file and image to http server?
但它对我不起作用。
这是我的代码：
protected void doFileUpload(){
Intent i = getIntent();
String path = i.getStringExtra("pathimage");
HttpURLConnection conn = null;
DataOutputStream dos = null;
DataInputStream inStream = null;
String existingFileName = path;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1*1024*1024;
String responseFromServer = "";
String urlString = Constants.url_create_store;
try
{
//------------------ CLIENT REQUEST
FileInputStream fileInputStream = new FileInputStream(new File(existingFileName) );
// open a URL connection to the Servlet
URL url = new URL(urlString);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.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);
dos = new DataOutputStream( conn.getOutputStream() );
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + existingFileName + "\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
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);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// close streams
Log.e("Debug","File is written");
fileInputStream.close();
dos.flush();
dos.close();
}
catch (MalformedURLException ex)
{
Log.e("Debug", "error: " + ex.getMessage(), ex);
}
catch (IOException ioe)
{
Log.e("Debug", "error: " + ioe.getMessage(), ioe);
}
//------------------ read the SERVER RESPONSE
try {
inStream = new DataInputStream ( conn.getInputStream() );
String str;
while (( str = inStream.readLine()) != null)
{
Log.e("Debug","Server Response "+str);
}
inStream.close();
}
catch (IOException ioex){
Log.e("Debug", "error: " + ioex.getMessage(), ioex);
}
}
}
这是我的logcat：
10-03 11:17:07.782: DEBUG/dalvikvm(119): GC_EXTERNAL_ALLOC freed 706 objects / 34184 bytes in 839ms
10-03 11:17:13.052: INFO/ActivityManager(67): Starting activity: Intent { cmp=shoop3.android.edu/.Activity3 (has extras) }
10-03 11:17:13.732: DEBUG/dalvikvm(468): GC_EXTERNAL_ALLOC freed 1652 objects / 91728 bytes in 187ms
10-03 11:17:15.162: INFO/ActivityManager(67): Displayed activity shoop3.android.edu/.Activity3: 1929 ms (total 1929 ms)
10-03 11:17:20.942: ERROR/Debug(468): File is written
10-03 11:17:24.802: ERROR/Debug(468): Server Response {"status":1}
10-03 11:17:25.272: ERROR/JSON Parser(468): Error parsing data org.json.JSONException: End of input at character 0 of
10-03 11:17:25.282: DEBUG/Create Response(468): {"status":1}
10-03 11:17:25.312: INFO/ActivityManager(67): Starting activity: Intent { cmp=shoop3.android.edu/.shoop3Activity }
10-03 11:17:26.825: INFO/ActivityManager(67): Displayed activity shoop3.android.edu/.shoop3Activity: 1349 ms (total 1349 ms)
10-03 11:19:24.372: DEBUG/SntpClient(67): request time failed: java.net.SocketException: Address family not supported by protocol
答案 0 :(得分：3)
您可以使用此SimpleMultipartEntity类发送Multipart数据：
public class SimpleMultipartEntity implements HttpEntity {
private final static char[] MULTIPART_CHARS = "-_1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
.toCharArray();
private String boundary = null;
ByteArrayOutputStream out = new ByteArrayOutputStream();
boolean isSetLast = false;
boolean isSetFirst = false;
public SimpleMultipartEntity() {
final StringBuffer buf = new StringBuffer();
final Random rand = new Random();
for (int i = 0; i < 30; i++) {
buf.append(MULTIPART_CHARS[rand.nextInt(MULTIPART_CHARS.length)]);
}
this.boundary = buf.toString();
}
public void writeFirstBoundaryIfNeeds() {
if (!isSetFirst) {
try {
out.write(("--" + boundary + "\r\n").getBytes());
} catch (final IOException e) {
e.printStackTrace();
}
}
isSetFirst = true;
}
public void writeLastBoundaryIfNeeds() {
if (isSetLast) {
return;
}
try {
out.write(("\r\n--" + boundary + "--\r\n").getBytes());
} catch (final IOException e) {
e.printStackTrace();
}
isSetLast = true;
}
public void addPart(final String key, final String value) {
writeFirstBoundaryIfNeeds();
try {
out.write(("Content-Disposition: form-data; name=\"" + key + "\"\r\n")
.getBytes());
out.write("Content-Type: text/plain; charset=UTF-8\r\n".getBytes());
out.write("Content-Transfer-Encoding: 8bit\r\n\r\n".getBytes());
out.write(value.getBytes());
out.write(("\r\n--" + boundary + "\r\n").getBytes());
} catch (final IOException e) {
e.printStackTrace();
}
}
public void addPart(final String key, final String fileName,
final InputStream fin) {
addPart(key, fileName, fin, "application/octet-stream");
}
public void addPart(final String key, final String fileName,
final InputStream fin, String type) {
writeFirstBoundaryIfNeeds();
try {
type = "Content-Type: " + type + "\r\n";
out.write(("Content-Disposition: form-data; name=\"" + key
+ "\"; filename=\"" + fileName + "\"\r\n").getBytes());
out.write(type.getBytes());
out.write("Content-Transfer-Encoding: binary\r\n\r\n".getBytes());
final byte[] tmp = new byte[4096];
int l = 0;
while ((l = fin.read(tmp)) != -1) {
out.write(tmp, 0, l);
}
out.flush();
} catch (final IOException e) {
e.printStackTrace();
} finally {
try {
fin.close();
} catch (final IOException e) {
e.printStackTrace();
}
}
}
public void addPart(final String key, final File value) {
try {
addPart(key, value.getName(), new FileInputStream(value));
} catch (final FileNotFoundException e) {
e.printStackTrace();
}
}
public String getBoundary() {
return boundary;
}
public void setBoundary(String boundary) {
this.boundary = boundary;
}
@Override
public long getContentLength() {
writeLastBoundaryIfNeeds();
return out.toByteArray().length;
}
@Override
public Header getContentType() {
return new BasicHeader("Content-Type", "multipart/form-data; boundary="
+ boundary);
}
@Override
public boolean isChunked() {
return false;
}
@Override
public boolean isRepeatable() {
return false;
}
@Override
public boolean isStreaming() {
return false;
}
@Override
public void writeTo(final OutputStream outstream) throws IOException {
outstream.write(out.toByteArray());
}
@Override
public Header getContentEncoding() {
return null;
}
@Override
public void consumeContent() throws IOException,
UnsupportedOperationException {
if (isStreaming()) {
throw new UnsupportedOperationException(
"Streaming entity does not implement #consumeContent()");
}
}
@Override
public InputStream getContent() throws IOException,
UnsupportedOperationException {
return new ByteArrayInputStream(out.toByteArray());
}
}
用法：
String serviceUri = "service url";
InputStream fileInputStream = mInputStream; //Your file stream
String fileName = "your file name";
String fileKey = "Key name what server is looking for"
HashMap<String, String> headerparts = mHeaderParts; //Other header parts that you need to send along.
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(serviceUri);
SimpleMultipartEntity entity = new SimpleMultipartEntity();
httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("Content-type", "multipart/form-data; boundary="
+ entity.getBoundary());
entity.writeFirstBoundaryIfNeeds();
if (headerparts != null) {
Object[] keySet = headerparts.keySet().toArray();
for (int i = 0; i < keySet.length; i++) {
String key = keySet[i].toString();
String value = headerparts.get(key);
entity.addPart(key, value);
}
}
entity.addPart(fileKey, fileName, fileInputStream);
entity.writeLastBoundaryIfNeeds();
httpPost.setEntity(entity);
try {
mResponse = httpClient.execute(httpPost);
} catch (Exception e) {
e.printStackTrace();
}