Android 图片上传

Posted 2020-08-17 linkai1

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:

 

public class Base64Code {

 

// constructor

public Base64Code() {

 

}

 

/**

* Encode image to Base64 string

* @param srcPath

* @return Base64 encoded string

*/

public static String encodeImageToBase64String(String srcPath) {

 

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

 

String imageString = null;

InputStream inputStream;

try {

inputStream = new FileInputStream(srcPath);

//You can get an inputStream using any IO API

byte[] bytes;

byte[] buffer = new byte[8192];

int bytesRead;

ByteArrayOutputStream output = new ByteArrayOutputStream();

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();

}

 

return imageString;

}

}

 

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 = "*****";

int bytesRead, bytesAvailable, bufferSize;

byte[] buffer;

int maxBufferSize = 1 * 1024 * 1024;

File sourceFile = new File(fileUrl);

 

if (!sourceFile.isFile()) {

dialog.dismiss();

 

runOnUiThread(new Runnable() {

 

public void run() {

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

}

});

 

return 0;

}

 

FileInputStream fileInputStream = new FileInputStream(sourceFile);

URL url = new URL(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 = new DataOutputStream(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 = 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);

 

// 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(new Runnable() {

 

public void run() {

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.Cancelable cancelable

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.