weixin.popular.util.StreamUtils Maven / Gradle / Ivy
package weixin.popular.util;
import java.io.ByteArrayOutputStream;
import java.io.FilterInputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.Charset;
public abstract class StreamUtils {
public static final int BUFFER_SIZE = 4096;
/**
* Copy the contents of the given InputStream into a new byte array.
* Leaves the stream open when done.
* @param in the stream to copy from
* @return the new byte array that has been copied to
* @throws IOException in case of I/O errors
*/
public static byte[] copyToByteArray(InputStream in) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream(BUFFER_SIZE);
copy(in, out);
return out.toByteArray();
}
/**
* Copy the contents of the given InputStream into a String.
* Leaves the stream open when done.
* @param in the InputStream to copy from
* @param charset charset
* @return the String that has been copied to
* @throws IOException in case of I/O errors
*/
public static String copyToString(InputStream in, Charset charset) throws IOException {
StringBuilder out = new StringBuilder();
InputStreamReader reader = new InputStreamReader(in, charset);
char[] buffer = new char[BUFFER_SIZE];
int bytesRead = -1;
while ((bytesRead = reader.read(buffer)) != -1) {
out.append(buffer, 0, bytesRead);
}
return out.toString();
}
/**
* Copy the contents of the given byte array to the given OutputStream.
* Leaves the stream open when done.
* @param in the byte array to copy from
* @param out the OutputStream to copy to
* @throws IOException in case of I/O errors
*/
public static void copy(byte[] in, OutputStream out) throws IOException {
out.write(in);
}
/**
* Copy the contents of the given String to the given output OutputStream.
* Leaves the stream open when done.
* @param in the String to copy from
* @param charset the Charset
* @param out the OutputStream to copy to
* @throws IOException in case of I/O errors
*/
public static void copy(String in, Charset charset, OutputStream out) throws IOException {
Writer writer = new OutputStreamWriter(out, charset);
writer.write(in);
writer.flush();
}
/**
* Copy the contents of the given InputStream to the given OutputStream.
* Leaves both streams open when done.
* @param in the InputStream to copy from
* @param out the OutputStream to copy to
* @return the number of bytes copied
* @throws IOException in case of I/O errors
*/
public static int copy(InputStream in, OutputStream out) throws IOException {
int byteCount = 0;
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = -1;
while ((bytesRead = in.read(buffer)) != -1) {
out.write(buffer, 0, bytesRead);
byteCount += bytesRead;
}
out.flush();
return byteCount;
}
/**
* Returns a variant of the given {@link InputStream} where calling
* {@link InputStream#close() close()} has no effect.
* @param in the InputStream to decorate
* @return a version of the InputStream that ignores calls to close
*/
public static InputStream nonClosing(InputStream in) {
return new NonClosingInputStream(in);
}
/**
* Returns a variant of the given {@link OutputStream} where calling
* {@link OutputStream#close() close()} has no effect.
* @param out the OutputStream to decorate
* @return a version of the OutputStream that ignores calls to close
*/
public static OutputStream nonClosing(OutputStream out) {
return new NonClosingOutputStream(out);
}
private static class NonClosingInputStream extends FilterInputStream {
public NonClosingInputStream(InputStream in) {
super(in);
}
@Override
public void close() throws IOException {
}
}
private static class NonClosingOutputStream extends FilterOutputStream {
public NonClosingOutputStream(OutputStream out) {
super(out);
}
@Override
public void write(byte[] b, int off, int let) throws IOException {
// It is critical that we override this method for performance
out.write(b, off, let);
}
@Override
public void close() throws IOException {
}
}
}