android 使用AsyncHttpClient框架上传文件以及使用HttpURLConnection下载文件
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AsyncHttpClient开源框架android-async-http还是非常方便的。 AsyncHttpClient该类通经常使用在android应用程序中创建异步GET,
POST, PUT和DELETE HTTP请求。请求參数通过RequestParams实例创建。响应通过重写匿名内部类 ResponseHandlerInterface的
方法处理。
1、看代码上传文件
public void uploadFile(ArrayList<String> sendFilesPath) {
if (sendFilesPath.size() == 0)
return ;
String strUploadFile = mstrIP + mstrUploadFile;
AsyncHttpClient client = new AsyncHttpClient();
client.setURLEncodingEnabled(false);
RequestParams params = new RequestParams();
params.put("user_name", mstrUser);
params.put("token", mstrCheckPass);
params.put("dir_parent", "@sys");
//批量上传
for (int i = 0; i < sendFilesPath.size(); i++) {
File myFile = new File(sendFilesPath.get(i));
try {
params.put(myFile.getName(), myFile);
} catch (FileNotFoundException e1) {
continue;
}
}
client.setTimeout(10000);
client.post(strUploadFile, params, new AsyncHttpResponseHandler() {
@Override
public void onFailure(int statusCode, Header[] headers,
byte[] responseBody, Throwable arg3) {
Log.i("Show", "upload failed");
}
@Override
public void onSuccess(int statusCode, Header[] headers,
byte[] responseBody) {
String responseData = new String();
responseData = new String(responseBody);
try {
JSONObject jsonObject = new JSONObject(responseData);
int status = jsonObject.getInt("status");
if (status == 1) {
Log.i("Show", "upload 1");
}
} catch (Exception e) {
}
}
@Override
public void onProgress(int bytesWritten, int totalSize) {
super.onProgress(bytesWritten, totalSize);
int count = (int) ((bytesWritten * 1.0 / totalSize) * 100);
// 上传进度显示
progress.setProgress(count);
Log.e("上传 Progress>>>>>", bytesWritten + " / " + totalSize);
}
@Override
public void onRetry(int retryNo) {
super.onRetry(retryNo);
// 返回重试次数
}
});
}
2、删除server文件代码
public void deleteFile(final ArrayList<String> needDeleteFilesPath) {
if (needDeleteFilesPath.size() == 0)
return;
String strDeleteFile = mstrIP + mstrDeleteFiles;
AsyncHttpClient client = new AsyncHttpClient();
client.setURLEncodingEnabled(false);
RequestParams params = new RequestParams();
params.put("user_name", mstrUser);
params.put("token", mstrCheckPass);
params.put("dir_parent", "@sys");
// 批量
for (int i = 0; i < needDeleteFilesPath.size(); i++) {
params.put("files_id", needDeleteFilesPath.get(i));
client.setTimeout(10000);
client.post(strDeleteFile, params, new AsyncHttpResponseHandler() {
@Override
public void onFailure(int statusCode, Header[] headers,
byte[] responseBody, Throwable arg3) {
Log.i("Show", "delete faile");
}
@Override
public void onSuccess(int statusCode, Header[] headers,
byte[] responseBody) {
String responseData = new String(responseBody);
}
});
}
}3、使用使用HttpURLConnection断点续传下载文件
AsyncTask<String, Integer, Boolean>异步管理下载文件，使用HttpURLConnection断点续传。
TaskDownFile mDownFile = new TaskDownFile(); mDownFile.executeOnExecutor(AsyncTask.SERIAL_EXECUTOR, url_downFile,fileName, String.valueOf(nDownID));
public class TaskDownFile extends AsyncTask<String, Integer, Boolean> {
@Override
protected void onPreExecute() {
}
@Override
protected Boolean doInBackground(String... arg0) {
String mFilePath;
String urlString = arg0[0];
String fileName = arg0[1];
int nDownID = Integer.parseInt(arg0[2]);
HttpURLConnection conn;
if (mFileInfos == null || mFileInfos.size() <= 0)
return false;
try {
File file = new File(mstrFilePath);
if (!file.exists())
file.mkdir();
mFilePath = mstrFilePath + "/" + fileName;
// 推断当前安装包路径以下是否有已经下载的文件, 如有则不下载,仅仅须要MD5校验就可以
String checkApkFilePath = mstrFilePath + "/" + fileName;
File checkApkFile = new File(checkApkFilePath);
if (checkApkFile.exists()) {
// MD5校验
String md5 = md5sum(mFilePath);
String fileTime = getFileDataTime(checkApkFile);
// MD5校验是否文件同样。在依据时间推断
if (md5.compareToIgnoreCase(mFileInfos.get(nDownID).md5) == 0)
return true;
else if (compareDataTime(fileTime,
mFileInfos.get(nDownID).create_time) > 0) {
mNumberList.add(nDownID);
return true;
} else {
// server文件最新。 删除本地文件
checkApkFile.delete();
}
}
// 暂时安装文件检验, 是否续传文件
mFilePath = mFilePath + ".temp";
long haveDownLength = 0;
File tempFile = new File(mFilePath);
if (tempFile.exists())
haveDownLength = tempFile.length();
conn = (HttpURLConnection) new URL(urlString).openConnection();
if (haveDownLength != 0)
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setReadTimeout(6000);
conn.setConnectTimeout(3000);
conn.setChunkedStreamingMode(0);
conn.setRequestMethod("GET");
conn.connect();
int fileSize = conn.getContentLength();
long countRead = haveDownLength;
if (fileSize > 0) {
InputStream stream = conn.getInputStream();
FileOutputStream fos = new FileOutputStream(mFilePath,
haveDownLength > 0 ? true : false);
int read = 0;
fileSize += haveDownLength;
byte buffer[] = new byte[1024];
while ((read = stream.read(buffer)) >= 0) {
countRead += read;
fos.write(buffer, 0, (int) read);
publishProgress((int) countRead, fileSize);
}
fos.flush();
stream.close();
fos.close();
} else {
fileSize = (int) haveDownLength;
}
conn.disconnect();
if (countRead != fileSize)
return false;
int index = mFilePath.indexOf(".temp");
if (index >= 1) {
String tempFilePath = mFilePath.substring(0, index);
File renameFile = new File(mFilePath);
File toFile = new File(tempFilePath);
renameFile.renameTo(toFile);
mFilePath = tempFilePath;
return true;
}
} catch (IOException e) {
Log.i("Show", e.toString());
return false;
} finally {
}
return false;
}
@Override
protected void onPostExecute(Boolean isSuccess) {
//下载后干什么
}
@Override
protected void onProgressUpdate(Integer...values) {
//进度条
if (values[0] == null) return;
downSize = values[0];
fileSize = values[1];
progress = (int) ((values[0] * 1.0 / values[1]) * 10000);
mHandler.sendEmptyMessage(DOWNLOAD);
}
}4、MD5检验文件
//文件md5获取
public static String md5sum(String filename) {
InputStream fis;
byte[] buffer = new byte[1024];
int numRead = 0;
MessageDigest md5;
try {
fis = new FileInputStream(filename);
md5 = MessageDigest.getInstance("MD5");
while ((numRead = fis.read(buffer)) > 0) {
md5.update(buffer, 0, numRead);
}
fis.close();
return toHexString(md5.digest());
} catch (Exception e) {
System.out.println("error");
return null;
}
}
//十六进制转换成字符串
public static String toHexString(byte[] b) {
char HEX_DIGITS[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F' };
StringBuilder sb = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
sb.append(HEX_DIGITS[(b[i] & 0xf0) >>> 4]);
sb.append(HEX_DIGITS[b[i] & 0x0f]);
}
return sb.toString();
}使用AsyncHttpClient也是能够上传、下载、删除的。
仅仅只是下载不是非常好用。
下载推荐使用HttpURLConnection。由于文件大的话，能够暂停下载。或者下载时候断了。能够又一次接着下载。
MD5在文件下载检验也是非常重要，看文件有没有丢失或者缺损。
下一章准备总结一下缓存txt数据。文件最后改动时间的比較。两个string数据的比較。
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