ro.pippo.core.util.IoUtils Maven / Gradle / Ivy
/*
* Copyright (C) 2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ro.pippo.core.util;
import java.io.BufferedWriter;
import java.io.Closeable;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
/**
* @author Decebal Suiu
*/
public class IoUtils {
private IoUtils() {}
/**
* Copies all data from an InputStream to an OutputStream.
*
* @return the number of bytes copied
* @throws IOException if an I/O error occurs
*/
public static long copy(InputStream input, OutputStream output) throws IOException {
byte[] buffer = new byte[2 * 1024];
long total = 0;
int count;
while ((count = input.read(buffer)) != -1) {
output.write(buffer, 0, count);
total += count;
}
return total;
}
public static String toString(InputStream input) throws IOException {
StringWriter writer = new StringWriter();
copy(input, writer);
return writer.toString();
}
public static long copy(Reader reader, Writer writer) throws IOException {
char[] buffer = new char[2 * 1024];
long total = 0;
int count;
while ((count = reader.read(buffer)) != -1) {
writer.write(buffer, 0, count);
total += count;
}
return total;
}
public static long copy(InputStream input, Writer writer) throws IOException {
return copy(new InputStreamReader(input, StandardCharsets.UTF_8), writer);
}
public static long copy(InputStream input, File file) throws IOException {
FileOutputStream output = new FileOutputStream(file);
try {
return copy(input, output);
} finally {
close(output);
}
}
public static void copy(String string, File file) throws IOException {
Writer writer = new BufferedWriter(new FileWriter(file));
try {
writer.write(string);
} finally {
close(writer);
}
}
/**
* Silently closes a Closeable.
*
* @return the exception or null if no exception thrown
*/
public static IOException close(Closeable closeable) {
try {
if (closeable != null) {
closeable.close();
}
} catch (IOException e) {
return e;
}
return null;
}
}