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:
- 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
- = x.http().post(params, new Callback.CommonCallback<ResponseEntity>() {
- @Override
- public void onSuccess(ResponseEntity result) {
- Snackbar.make(view, "上传成功", Snackbar.LENGTH_LONG)
- .setAction("Action", null).show();
- }
- @Override
- public void onError(Throwable ex, boolean isOnCallback) {
- Snackbar.make(view, "上传失败", Snackbar.LENGTH_LONG)
- .setAction("Action", null).show();
- }
- });
以上三步就可以完成图片上传.