使用Java上传文件
从Apache Software Foundation下载HttpClient 4.3.4。
在工程中添加下面的jar包：
参考sample，写一个简单的上传：
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public
static
void
main(String[] args)
throws
Exception {
// TODO Auto-generated method stub
CloseableHttpClient httpclient = HttpClients.createDefault();
try
{
HttpPost httppost =
new
HttpPost(
"http://localhost:8003/savetofile.php"
); // your server
FileBody bin =
new
FileBody(
new
File(
"my.jpg"
));
// image for uploading
HttpEntity reqEntity = MultipartEntityBuilder.create()
.addPart(
"myFile"
, bin)
.build();
httppost.setEntity(reqEntity);
System.out.println(
"executing request "
+ httppost.getRequestLine());
CloseableHttpResponse response = httpclient.execute(httppost);
try
{
System.out.println(
"----------------------------------------"
);
System.out.println(response.getStatusLine());
HttpEntity resEntity = response.getEntity();
if
(resEntity !=
null
) {
System.out.println(
"Response content length: "
+ resEntity.getContentLength());
}
EntityUtils.consume(resEntity);
}
finally
{
response.close();
}
}
finally
{
httpclient.close();
}
}
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Android上拍照
Camera的使用很简单，只需要参考开发者网站的这篇Taking Photos Simply。
调用系统camera只需要如下代码：
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Intent intent =
new
Intent(
"android.media.action.IMAGE_CAPTURE"
);
startActivityForResult(intent,
0
);
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拍照之后，camera会返回缩略图：
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protected
void
onActivityResult(
int
requestCode,
int
resultCode, Intent data) {
if
(requestCode ==
0
&& resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get(
"data"
);
mImageView.setImageBitmap(imageBitmap);
}
}
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如果要获得高质量的图，就需要指定照片的保存路径。在AndroidManifest.xml中添加下面的权限：
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<uses-permission android:name=
"android.permission.READ_EXTERNAL_STORAGE"
/>
<uses-permission android:name=
"android.permission.WRITE_EXTERNAL_STORAGE"
/>
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修改调用方法：
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Intent intent =
new
Intent(
"android.media.action.IMAGE_CAPTURE"
);
Intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
startActivityForResult(intent,
0
);
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拍照之后，使用预设的图片路径解码，就可以获取高质量的图：
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protected
void
onActivityResult(
int
requestCode,
int
resultCode, Intent data) {
if
(requestCode ==
0
&& resultCode == Activity.RESULT_OK) {
setPic();
}
}
private
void
setPic() {
// Get the dimensions of the View
int
targetW = mImageView.getWidth();
int
targetH = mImageView.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions =
new
BitmapFactory.Options();
bmOptions.inJustDecodeBounds =
true
;
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int
photoW = bmOptions.outWidth;
int
photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int
scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds =
false
;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable =
true
;
Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
mImageView.setImageBitmap(bitmap);
}
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从Android客户端传送图片到PHP服务器
要访问Internet，在AndroidManifest.xml中添加访问权限：
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<uses-permission android:name=
"android.permission.INTERNET"
/>
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参考http://blog.rafaelsanches.com/2011/01/29/upload-using-multipart-post-using-httpclient-in-android/，创建一个类MultipartEntity：
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public
class
MultipartEntity
implements
HttpEntity {
private
String boundary =
null
;
ByteArrayOutputStream out =
new
ByteArrayOutputStream();
boolean
isSetLast =
false
;
boolean
isSetFirst =
false
;
public
MultipartEntity() {
this
.boundary = System.currentTimeMillis() +
""
;
}
public
void
writeFirstBoundaryIfNeeds(){
if
(!isSetFirst){
try
{
out.write((
"--"
+ boundary +
"\r\n"
).getBytes());
}
catch
(
final
IOException e) {
}
}
isSetFirst =
true
;
}
public
void
writeLastBoundaryIfNeeds() {
if
(isSetLast){
return
;
}
try
{
out.write((
"\r\n--"
+ boundary +
"--\r\n"
).getBytes());
}
catch
(
final
IOException e) {
}
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) {
}
}
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) {
}
finally
{
try
{
fin.close();
}
catch
(
final
IOException e) {
}
}
}
public
void
addPart(
final
String key,
final
File value) {
try
{
addPart(key, value.getName(),
new
FileInputStream(value));
}
catch
(
final
FileNotFoundException e) {
}
}
@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());
}
}
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使用AsyncTask来完成上传：
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private
class
UploadTask
extends
AsyncTask<Bitmap, Void, Void> {
protected
Void doInBackground(Bitmap... bitmaps) {
if
(bitmaps[
0
] ==
null
)
return
null
;
Bitmap bitmap = bitmaps[
0
];
ByteArrayOutputStream stream =
new
ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG,
100
, stream);
// convert Bitmap to ByteArrayOutputStream
InputStream in =
new
ByteArrayInputStream(stream.toByteArray());
// convert ByteArrayOutputStream to ByteArrayInputStream
DefaultHttpClient httpclient =
new
DefaultHttpClient();
try
{
HttpPost httppost =
new
HttpPost(
"http://192.168.8.84:8003/savetofile.php"
); // server
MultipartEntity reqEntity =
new
MultipartEntity();
reqEntity.addPart(
"myFile"
,
System.currentTimeMillis() +
".jpg"
, in);
httppost.setEntity(reqEntity);
Log.i(TAG,
"request "
+ httppost.getRequestLine());
HttpResponse response =
null
;
try
{
response = httpclient.execute(httppost);
}
catch
(ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch
(IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try
{
if
(response !=
null
)
Log.i(TAG,
"response "
+ response.getStatusLine().toString());
}
finally
{
}
}
finally
{
}
if
(in !=
null
) {
try
{
in.close();
}
catch
(IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if
(stream !=
null
) {
try
{
stream.close();
}
catch
(IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return
null
;
}
@Override
protected
void
onPostExecute(Void result) {
// TODO Auto-generated method stub
super
.onPostExecute(result);
Toast.makeText(MainActivity.
this
, R.string.uploaded, Toast.LENGTH_LONG).show();
}
}
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代码
https://github.com/DynamsoftRD/JavaHTTPUpload
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Git clone https:
//github.com/DynamsoftRD/JavaHTTPUpload.git
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