Java InputStream.read方法代码示例

import java.io.InputStream; //导入方法依赖的package包/类
public static void copyFile(String oldPathFile, String newPathFile) {
	try {
		int bytesum = 0;
		int byteread = 0;
		File oldfile = new File(oldPathFile);
		if (oldfile.exists()) { // 文件存在
			InputStream inStream = new FileInputStream(oldPathFile); // 读入源文�?
			File n = new File(newPathFile);
			if (!n.exists()) {
				n.createNewFile();
			}
			FileOutputStream fs = new FileOutputStream(newPathFile);
			byte[] buffer = new byte[1444];
			while ((byteread = inStream.read(buffer)) != -1) {
				bytesum += byteread; // 字节 文件大小
				fs.write(buffer, 0, byteread);
			}
			fs.flush();
			fs.close();
			inStream.close();
		}
	} catch (Exception e) {
		e.printStackTrace();
	}
}
 

import java.io.InputStream; //导入方法依赖的package包/类
/**
 * inputStream转outputStream
 *
 * @param is 输入流
 * @return outputStream子类
 */
public static ByteArrayOutputStream input2OutputStream(InputStream is) {
    if (is == null) return null;
    try {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        byte[] b = new byte[MemoryConstants.KB];
        int len;
        while ((len = is.read(b, 0, MemoryConstants.KB)) != -1) {
            os.write(b, 0, len);
        }
        return os;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    } finally {
        CloseUtils.closeIO(is);
    }
}
 

import java.io.InputStream; //导入方法依赖的package包/类
public byte[] getUrlBytes(String urlSpec) throws IOException {
    URL url = new URL(urlSpec);
    HttpURLConnection connection = (HttpURLConnection)url.openConnection();
    try {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        InputStream in = connection.getInputStream();
        if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
            throw new IOException(connection.getResponseMessage() +
                    ": with " +
                    urlSpec);
        }
        int bytesRead = 0;
        byte[] buffer = new byte[1024];
        while ((bytesRead = in.read(buffer)) > 0) {
            out.write(buffer, 0, bytesRead);
        }
        out.close();
        return out.toByteArray();
    } finally {
        connection.disconnect();
    }
}
 

import java.io.InputStream; //导入方法依赖的package包/类
private void injectDraculaCSS(String mode) {
	try {
		InputStream inputStream = getAssets().open("dracula.css");
		byte[] buffer = new byte[inputStream.available()];
		inputStream.read(buffer);
		inputStream.close();
		webView.loadUrl("javascript:(function() {var parent = document.getElementsByTagName('head').item(0);var style = document.createElement('style');style.type = 'text/css';style.innerHTML = window.atob('" + Base64.encodeToString(buffer, 2) + "');" + "parent.appendChild(style)" + "})()");
	} catch (Exception d) {
		d.printStackTrace();
	}
}
 

import java.io.InputStream; //导入方法依赖的package包/类
public static void drain(InputStream inStr)
    throws IOException
{
    byte[] bs = new byte[BUFFER_SIZE];
    while (inStr.read(bs, 0, bs.length) >= 0)
    {
    }
}
 

import java.io.InputStream; //导入方法依赖的package包/类
/**
 * Simple wrapper around {@link InputStream#read()} that throws EOFException
 * instead of returning -1.
 */
private static int read(InputStream is) throws IOException {
    int b = is.read();
    if (b == -1) {
        throw new EOFException();
    }
    return b;
}
 

import java.io.InputStream; //导入方法依赖的package包/类
public AsymmetricKeyParameter readKey(InputStream stream)
    throws IOException
{
    byte[] V = new byte[(dhParams.getP().bitLength() + 7) / 8];

    stream.read(V, 0, V.length);

    return new DHPublicKeyParameters(new BigInteger(1, V), dhParams);
}
 

import java.io.InputStream; //导入方法依赖的package包/类
public static String readResponse(InputStream stream) throws IOException {

        byte[] data = new byte[100];
        int read;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        while ((read = stream.read(data)) != -1) {
            out.write(data, 0, read);
        }
        return new String(out.toByteArray(), StandardCharsets.UTF_8);
    }
 

import java.io.InputStream; //导入方法依赖的package包/类
/**
 * Creates an AcceptSecContextToken at the context initiator's side
 * using the bytes received from  the acceptor.
 */
public AcceptSecContextToken(Krb5Context context,
                             Credentials serviceCreds, KrbApReq apReq,
                             InputStream is)
    throws IOException, GSSException, KrbException  {

    int tokenId = ((is.read()<<8) | is.read());

    if (tokenId != Krb5Token.AP_REP_ID)
        throw new GSSException(GSSException.DEFECTIVE_TOKEN, -1,
                               "AP_REP token id does not match!");

    byte[] apRepBytes =
        new sun.security.util.DerValue(is).toByteArray();

    KrbApRep apRep = new KrbApRep(apRepBytes, serviceCreds, apReq);

    /*
     * Allow the context acceptor to set a subkey if desired, even
     * though our context acceptor will not do so.
     */
    EncryptionKey subKey = apRep.getSubKey();
    if (subKey != null) {
        context.setKey(Krb5Context.ACCEPTOR_SUBKEY, subKey);
        /*
        System.out.println("\n\nSub-Session key from AP-REP is: " +
                           getHexBytes(subKey.getBytes()) + "\n");
        */
    }

    Integer apRepSeqNumber = apRep.getSeqNumber();
    int peerSeqNumber = (apRepSeqNumber != null ?
                         apRepSeqNumber.intValue() :
                         0);
    context.resetPeerSequenceNumber(peerSeqNumber);
}
 

import java.io.InputStream; //导入方法依赖的package包/类
private void injectHide(String mode) {
    try {
        InputStream inputStream = getAssets().open("hidepeople.css");
        byte[] buffer = new byte[inputStream.available()];
        inputStream.read(buffer);
        inputStream.close();
        webView.loadUrl("javascript:(function() {var parent = document.getElementsByTagName('head').item(0);var style = document.createElement('style');style.type = 'text/css';style.innerHTML = window.atob('" + Base64.encodeToString(buffer, 2) + "');" + "parent.appendChild(style)" + "})()");
    } catch (Exception d) {
        d.printStackTrace();
    }
}
 

import java.io.InputStream; //导入方法依赖的package包/类
public static boolean checkExceptions(InputStream in) throws IOException {
    String tempString;
    int count = in.available();
    boolean exception = false;
    while (count > 0) {
        byte[] b = new byte[count];
        in.read(b);
        tempString = new String(b);
        if (!exception) {
            exception = tempString.contains("RunTimeException");
        }
        count = in.available();
    }
    return exception;
}
 

import java.io.InputStream; //导入方法依赖的package包/类
/**
* receive whole pack
* @param in input stream
* @param expect_cmd expect response command
* @param expect_body_len expect response package body length
* @return PkgInfo: status and reponse body(byte buff)
*/
	public static PkgInfo recvPackage(InputStream in, byte expect_cmd, long expect_body_len) throws IOException
	{
		PkgHeader header = recvHeader(in, expect_cmd, expect_body_len);
		if (header.status != 0)
		{
			return new PkgInfo(header, null);
		}
		
		byte[] body = new byte[header.body_len];
		int totalBytes = 0;
		int remainBytes = header.body_len;
		int bytes;
		
		while (totalBytes < header.body_len)
		{
			if ((bytes=in.read(body, totalBytes, remainBytes)) < 0)
			{
				break;
			}
			
			totalBytes += bytes;
			remainBytes -= bytes;
		}
		
		if (totalBytes != header.body_len)
		{
			throw new IOException("recv package size " + totalBytes + " != " + header.body_len);
		}
		
		return new PkgInfo(header, body);
	}
 

import java.io.InputStream; //导入方法依赖的package包/类
static void readOneRequest(InputStream is) throws IOException {
    int requestEndCount = 0, r;
    while ((r = is.read()) != -1) {
        if (r == requestEnd[requestEndCount]) {
            requestEndCount++;
            if (requestEndCount == 4) {
                break;
            }
        } else {
            requestEndCount = 0;
        }
    }
}
 

import java.io.InputStream; //导入方法依赖的package包/类
private static void copyResource(CordovaResourceApi.OpenForReadResult input, OutputStream outputStream) throws IOException {
    try {
        InputStream inputStream = input.inputStream;
        if (inputStream instanceof FileInputStream && outputStream instanceof FileOutputStream) {
            FileChannel inChannel = ((FileInputStream)input.inputStream).getChannel();
            FileChannel outChannel = ((FileOutputStream)outputStream).getChannel();
            long offset = 0;
            long length = input.length;
            if (input.assetFd != null) {
                offset = input.assetFd.getStartOffset();
            }
            // transferFrom()'s 2nd arg is a relative position. Need to set the absolute
            // position first.
            inChannel.position(offset);
            outChannel.transferFrom(inChannel, 0, length);
        } else {
            final int BUFFER_SIZE = 8192;
            byte[] buffer = new byte[BUFFER_SIZE];

            for (;;) {
                int bytesRead = inputStream.read(buffer, 0, BUFFER_SIZE);

                if (bytesRead <= 0) {
                    break;
                }
                outputStream.write(buffer, 0, bytesRead);
            }
        }
    } finally {
        input.inputStream.close();
        if (outputStream != null) {
            outputStream.close();
        }
    }
}
 

import java.io.InputStream; //导入方法依赖的package包/类
public static double readDouble(final InputStream stream)
        throws IOException {
    long res = stream.read();
    res |= (long) stream.read() << 8;
    res |= (long) stream.read() << 16;
    res |= (long) stream.read() << 24;
    res |= (long) stream.read() << 32;
    res |= (long) stream.read() << 40;
    res |= (long) stream.read() << 48;
    res |= (long) stream.read() << 56;
    return Double.longBitsToDouble(res);
}