public class DownloadUtil {
private static final int TIME_OUT = 30 * 1000;
private static final String CHARSET = "utf-8";
/**
* @param file 上传文件
* @param RequestURL 上传文件URL
* @return 服务器返回的信息，如果出错则返回为null
*/
public static String uploadFile(File file, String RequestURL) {
String BOUNDARY = UUID.randomUUID().toString();
String PREFIX = "--", LINE_END = "\r\n";
String CONTENT_TYPE = "multipart/form-data";
try {
URL url = new URL(RequestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIME_OUT);
conn.setConnectTimeout(TIME_OUT);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Charset", CHARSET);
conn.setRequestProperty("Cookie", "PHPSESSID=" + App.getSessionId());
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);
if (file != null) {
/** * 当文件不为空，把文件包装并且上传 */
OutputStream outputSteam = conn.getOutputStream();
DataOutputStream dos = new DataOutputStream(outputSteam);
StringBuffer sb = new StringBuffer();
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINE_END);
/**
* 这里重点注意：
* name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件
* filename是文件的名字，包含后缀名的 比如:abc.png
*/
sb.append("Content-Disposition: form-data; name=\"img\"; filename=\"" + file.getName() + "\"" + LINE_END);
sb.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINE_END);
sb.append(LINE_END);
dos.write(sb.toString().getBytes());
InputStream is = new FileInputStream(file);
byte[] bytes = new byte[1024];
int len;
while ((len = is.read(bytes)) != -1) {
dos.write(bytes, 0, len);
}
is.close();
dos.write(LINE_END.getBytes());
byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END).getBytes();
dos.write(end_data);
dos.flush();
/**
* 获取响应码 200=成功
* 当响应成功，获取响应的流
*/
ByteArrayOutputStream bos = new ByteArrayOutputStream();
InputStream resultStream = conn.getInputStream();
len = -1;
byte[] buffer = new byte[1024 * 8];
while ((len = resultStream.read(buffer)) != -1) {
bos.write(buffer, 0, len);
}
resultStream.close();
bos.flush();
bos.close();
String info = new String(bos.toByteArray());
int res = conn.getResponseCode();
if (res == 200) {
return info;
} else {
return null;
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 下载文件
*/
public static byte[] download(String urlStr) {
HttpURLConnection conn = null;
InputStream is = null;
byte[] result = null;
ByteArrayOutputStream bos = null;
try {
URL url = new URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(TIME_OUT);
conn.setReadTimeout(TIME_OUT);
conn.setDoInput(true);
conn.setUseCaches(false);
if (conn.getResponseCode() == 200) {
is = conn.getInputStream();
byte[] buffer = new byte[1024 * 8];
int len;
bos = new ByteArrayOutputStream();
while ((len = is.read(buffer)) != -1) {
bos.write(buffer, 0, len);
}
bos.flush();
result = bos.toByteArray();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (bos != null) {
bos.close();
}
if (is != null) {
is.close();
}
if (conn != null) conn.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
return result;
}
/**
* 获取缓存文件
*/
public static File getDiskCacheFile(Context context, String filename, boolean isExternal) {
if (isExternal && (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))) {
return new File(context.getExternalCacheDir(), filename);
} else {
return new File(context.getCacheDir(), filename);
}
}
/**
* 获取缓存文件目录
*/
public static File getDiskCacheDirectory(Context context) {
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
return context.getExternalCacheDir();
} else {
return context.getCacheDir();
}
}
}