Android 图片上传

上传方式:两种

1:Base64()

(1):获取图片路径,将图片转为String 类型

(2):通过post提交的方式.以键值对的方式上传到服务器,和一般的提交关键字没有任何区别.

(3):这种适用于图片少的时候使用.

转码代码如下:

publicclassBase64Code {

// constructor

publicBase64Code() {

}

/**

* Encode image to Base64 string

* @param srcPath

* @return Base64 encoded string

*/

publicstaticString encodeImageToBase64String(String srcPath) {

Log.d("srcPath:", srcPath);

String imageString =null;

InputStream inputStream;

try{

inputStream =newFileInputStream(srcPath);

//You can get an inputStream using any IO API

byte[] bytes;

byte[] buffer = newbyte[8192];

intbytesRead;

ByteArrayOutputStream output =newByteArrayOutputStream();

try{

while((bytesRead = inputStream.read(buffer)) != -1) {

output.write(buffer,0, bytesRead);

}

inputStream.close();

bytes = output.toByteArray();

imageString = Base64.encodeToString(bytes,0, bytes.length, Base64.NO_WRAP);

}catch(IOException e) {

e.printStackTrace();

}

}catch(FileNotFoundException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

returnimageString;

}

}

2:以IO流的形式进行提交(表单提交)

代码如下:

String fileName = fileUrl.substring(fileUrl.lastIndexOf("/") + 1);

HttpURLConnection conn =null;

DataOutputStream dos =null;

String lineEnd ="\r\n";

String twoHyphens ="--";

String boundary ="*****";

intbytesRead, bytesAvailable, bufferSize;

byte[] buffer;

intmaxBufferSize =1* 1024* 1024;

File sourceFile =newFile(fileUrl);

if(!sourceFile.isFile()) {

dialog.dismiss();

runOnUiThread(newRunnable() {

publicvoidrun() {

messageText.setText("Source File not exist :"+ fileUrl);

}

});

return0;

}

FileInputStream fileInputStream =newFileInputStream(sourceFile);

URL url =newURL(uploadUrl);

// Open a HTTP connection to the URL

conn = (HttpURLConnection) url.openConnection();

conn.setDoInput(true);// Allow Inputs

conn.setDoOutput(true);// Allow Outputs

conn.setUseCaches(false);// Don't use a Cached Copy

conn.setRequestMethod("POST");

conn.setRequestProperty("Connection","Keep-Alive");

conn.setRequestProperty("ENCTYPE","multipart/form-data");

conn.setRequestProperty("Content-Type",

"multipart/form-data;boundary="+ boundary);

conn.setRequestProperty("uploaded_file", fileName);

dos =newDataOutputStream(conn.getOutputStream());

dos.writeBytes(twoHyphens + boundary + lineEnd);

dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""

+ fileName +"\""+ lineEnd);

dos.writeBytes(lineEnd);

// create a buffer of maximum size

bytesAvailable = fileInputStream.available();

bufferSize = Math.min(bytesAvailable, maxBufferSize);

buffer =newbyte[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);

// Responses from the server (code and message)

serverResponseCode = conn.getResponseCode();

String serverResponseMessage = conn.getResponseMessage();

Log.i("uploadFile","HTTP Response is : "+ serverResponseMessage +": "+ serverResponseCode);

if(serverResponseCode ==200) {

runOnUiThread(newRunnable() {

publicvoidrun() {

Toast.makeText(UploadToServerActivity.this,"File Upload Complete.", Toast.LENGTH_SHORT).show();

}

});

}

// close the streams //

fileInputStream.close();

dos.flush();

dos.close();

使用第三方框架Xutils 进行图片上传步骤(也称为表单提交)

第一步:首先还是在application中初始化：

1. x.Ext.init(this);

第二步:然后使用org.xutils.http包下的RequestParams来构造参数

params = new RequestParams(url);

//上传图片的关键方法.键值对

params.addBodyParameter("upload", new File(fileName));

第三步:使用Callback.Cancekable来进行请求回调：

Callback.Cancelablecancelable

1. = x.http().post(params, new Callback.CommonCallback<ResponseEntity>() {
2. 
   
3. @Override
4. public void onSuccess(ResponseEntity result) {
5. Snackbar.make(view, "上传成功", Snackbar.LENGTH_LONG)
6. .setAction("Action", null).show();
7. }
8. 
   
9. @Override
10. public void onError(Throwable ex, boolean isOnCallback) {
11. 
    
12. Snackbar.make(view, "上传失败", Snackbar.LENGTH_LONG)
13. .setAction("Action", null).show();
14. 
    
15. }
16. 
    
17. });

以上三步就可以完成图片上传.