1 权限
基本的用户权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.INTERNET" />
应用权限
<application
android:allowBackup="true"
android:usesCleartextTraffic="true"
android:requestLegacyExternalStorage="true" //没有此权限，则总是提示文件无法找到错误
2 绝对路径获取
/**
* Try to return the absolute file path from the given Uri
*
* @param context
* @param uri
* @return the file path or null
*/
public static String getRealFilePath( final Context context, final Uri uri ) {
if ( null == uri ) return null;
final String scheme = uri.getScheme();
String data = null;
if ( scheme == null )
data = uri.getPath();
else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) {
data = uri.getPath();
} else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) {
Cursor cursor = context.getContentResolver().query( uri, new String[] { MediaStore.Images.ImageColumns.DATA }, null, null, null );
if ( null != cursor ) {
if ( cursor.moveToFirst() ) {
int index = cursor.getColumnIndex( MediaStore.Images.ImageColumns.DATA );
if ( index > -1 ) {
data = cursor.getString( index );
}
}
cursor.close();
}
}
return data;
}
3 异步线程
//图片上传异步线程
private class WxpPicTransferToServerTask extends AsyncTask<String, Integer, String> {
@Override
protected void onPostExecute(String result) {
//最终结果的显示
//mTvProgress.setText(result);
tx.setText(result);
}
@Override
protected void onPreExecute() {
//开始前的准备工作
//mTvProgress.setText("loading...");
tx.setText("loading .....");
}
@Override
protected void onProgressUpdate(Integer... values) {
//显示进度
// mPgBar.setProgress(values[0]);
// mTvProgress.setText("loading..." + values[0] + "%");
tx.setText("loading:"+String.valueOf(values[0])+"%");
}
@Override
protected String doInBackground(String... params)
{
//这里params[0]和params[1]是execute传入的两个参数
String filePath = params[0];
String uploadUrl = params[1];
//下面即手机端上传文件的代码
String end = "\r\n";
String twoHyphens = "--";
String boundary = "******";
try {
URL url = new URL(uploadUrl);
HttpURLConnection httpURLConnection = (HttpURLConnection) url
.openConnection();
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.setUseCaches(false);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setConnectTimeout(6 * 1000);
httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
httpURLConnection.setRequestProperty("Charset", "UTF-8");
httpURLConnection.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
DataOutputStream dos = new DataOutputStream(httpURLConnection
.getOutputStream());
dos.writeBytes(twoHyphens + boundary + end);
dos
.writeBytes("Content-Disposition: form-data; name=\"file\"; filename=\""
+ filePath.substring(filePath.lastIndexOf("/") + 1)
+ "\"" + end);
dos.writeBytes(end);
//获取文件总大小
FileInputStream fis = new FileInputStream(filePath);
long total = fis.available();
byte[] buffer = new byte[8192]; // 8k
int count = 0;
int length = 0;
while ((count = fis.read(buffer)) != -1) {
dos.write(buffer, 0, count);
//获取进度，调用publishProgress()
length += count;
publishProgress((int) ((length / (float) total) * 100));
//这里是测试时为了演示进度,休眠500毫秒，正常应去掉
//Thread.sleep(500);
}
fis.close();
dos.writeBytes(end);
dos.writeBytes(twoHyphens + boundary + twoHyphens + end);
dos.flush();
InputStream is = httpURLConnection.getInputStream();
InputStreamReader isr = new InputStreamReader(is, "utf-8");
BufferedReader br = new BufferedReader(isr);
@SuppressWarnings("unused")
String result = br.readLine();
dos.close();
is.close();
return "上传成功";
} catch (Exception e)
{
e.printStackTrace();
return "上传失败"+e.toString();
}
}
}
//4 相册图片选取并上传
String[] mPermissionList = new String[]{
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.ACCESS_NETWORK_STATE};
public static final int REQUEST_PICK_IMAGE = 11101;
//文件上传异步类
String STR_REQUESTURL="http://x.x.x.x/Default4.aspx";
String mCurrentPhotoPath="";
private ImageView mShowImg;
private TextView tx;
private Button bt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mShowImg = (ImageView) findViewById(R.id.imageView);
tx = (TextView) findViewById(R.id.txt);
bt=(Button) findViewById(R.id.button);
mShowImg.setImageResource(R.mipmap.ic_launcher);
bt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
openPhotoAlbum();
}
});
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case 100:
boolean writeExternalStorage = grantResults[0] == PackageManager.PERMISSION_GRANTED;
boolean readExternalStorage = grantResults[1] == PackageManager.PERMISSION_GRANTED;
if (grantResults.length > 0 && writeExternalStorage && readExternalStorage) {
getImage();
} else {
Toast.makeText(this, "请设置必要权限", Toast.LENGTH_SHORT).show();
}
break;
}
}
private void getImage() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
startActivityForResult(new Intent(Intent.ACTION_GET_CONTENT).setType("image/*"),
REQUEST_PICK_IMAGE);
} else {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
startActivityForResult(intent, REQUEST_PICK_IMAGE);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
switch (requestCode) {
case REQUEST_PICK_IMAGE:
if (data != null) {
String realPathFromUri=getRealFilePath(this,data.getData());
tx.setText(realPathFromUri);
//显示图片
mShowImg.setImageURI(data.getData());
//上传文件
WxpPicTransferToServerTask mTask = new WxpPicTransferToServerTask();
mTask.execute(realPathFromUri, STR_REQUESTURL);
Toast.makeText(this, "success", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "图片损坏，请重新选择", Toast.LENGTH_SHORT).show();
}
break;
}
}
}
//
//打开相册
public void openPhotoAlbum() {
ActivityCompat.requestPermissions(MainActivity.this, mPermissionList, 100);
}5 ASPX服务器端保存代码
其他复杂的都是错误的，核心功能一行代码搞定
protected void Page_Load(object sender, EventArgs e)
{
string FileSaveDisk = "D:\\phpstudy_pro\\WWW\\WebSite2\\WxpPic";
string imgFile = DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
string filePath = FileSaveDisk + "\\" + imgFile;
//测试代码
if (!IsPostBack)
{
if (this.Request.Files.Count > 0)
{
HttpPostedFile file = this.Request.Files.Get(0);
try
{
file.SaveAs(filePath);
Response.Write("success");
}
catch
{
Response.Write("error");
}
}
}
return;
}