IOUtil.java
package com.foxinmy.weixin4j.util;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.Charset;
/**
* IOUtil
*
* @author jinyu(foxinmy@gmail.com)
* @className IOUtil
* @date 2014年9月22日
* @see org.apache.commons.io.IOUtils
* @since JDK 1.6
*/
public class IOUtil {
private static final int EOF = -1;
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
public static byte[] toByteArray(Reader input) throws IOException {
return toByteArray(input, Charset.defaultCharset());
}
public static byte[] toByteArray(Reader input, Charset encoding) throws IOException {
ByteArrayOutputStream output = new ByteArrayOutputStream();
copy(input, output, encoding);
return output.toByteArray();
}
public static void copy(Reader input, OutputStream output, Charset encoding) throws IOException {
OutputStreamWriter out = new OutputStreamWriter(output, encoding);
copyLarge(input, out, new char[DEFAULT_BUFFER_SIZE]);
out.flush();
}
public static int copy(InputStream input, OutputStream output) throws IOException {
long count = copyLarge(input, output);
if (count > Integer.MAX_VALUE) {
return -1;
}
return (int) count;
}
private static long copyLarge(InputStream input, OutputStream output) throws IOException {
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
long count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
public static byte[] toByteArray(InputStream input) throws IOException {
ByteArrayOutputStream output = new ByteArrayOutputStream();
copyLarge(input, output, new byte[DEFAULT_BUFFER_SIZE]);
return output.toByteArray();
}
private static long copyLarge(InputStream input, OutputStream output, byte[] buffer) throws IOException {
long count = 0;
int n = 0;
while (EOF != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
private static long copyLarge(Reader input, Writer output, char[] buffer) throws IOException {
long count = 0;
int n = 0;
while (EOF != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
public static void close(Closeable stream) {
try {
if(stream == null){
return ;
}
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}