一般的なファイル操作方法
3022 ワード
1.inputsream
public static byte[] toByteArray(InputStream in) throws IOException {
ByteArrayOutputStream out=new ByteArrayOutputStream();
byte[] buffer=new byte[1024*4];
int n=0;
while ( (n=in.read(buffer)) !=-1) {
out.write(buffer,0,n);
}
return out.toByteArray();
}
2.
/**
*
*
* @param remoteFilePath
* @param localFilePath
*/
public boolean downloadFile(String remoteFilePath, String localFilePath) {
URL urlfile = null;
HttpURLConnection httpUrl = null;
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try {
File f = new File(localFilePath);
File parent = f.getParentFile();
if(parent!=null&&!parent.exists()){
parent.mkdirs();
}
f.createNewFile();
urlfile = new URL(remoteFilePath);
httpUrl = (HttpURLConnection) urlfile.openConnection();
httpUrl.connect();
bis = new BufferedInputStream(httpUrl.getInputStream());
bos = new BufferedOutputStream(new FileOutputStream(f));
int len = 2048;
byte[] b = new byte[len];
while ((len = bis.read(b)) != -1) {
bos.write(b, 0, len);
}
if(bis!=null){
bis.close();
}
bos.flush();
httpUrl.disconnect();
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
try {
if(bis!=null){
bis.close();
}
if(bos!=null){
bos.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return true;
}
String result = "";
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(url);
try {
HttpResponse response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();
//
BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));
String line ;
while ((line = reader.readLine()) != null) {
result = line;
}
entity.consumeContent();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}