com.sunchenbin.store.feilong.core.io.InputStreamUtil.java Source code

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Here is the source code for com.sunchenbin.store.feilong.core.io.InputStreamUtil.java

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/*
 * Copyright (C) 2008 feilong
 *
 * 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 com.sunchenbin.store.feilong.core.io;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * {@link java.io.InputStream} .
 *
 * @author feilong
 * @version 1.0.9 201536 ?10:28:58
 * @see ReaderUtil
 * @see java.io.InputStream
 * @since 1.0.9
 */
public final class InputStreamUtil {

    /** The Constant LOGGER. */
    private static final Logger LOGGER = LoggerFactory.getLogger(InputStreamUtil.class);

    /** Don't let anyone instantiate this class. */
    private InputStreamUtil() {
        //AssertionError?. ?????. ???.
        //see Effective Java 2nd
        throw new AssertionError("No " + getClass().getName() + " instances for you!");
    }

    /**
     *  {@link java.io.InputStream} ?string.<br>
     * ? {@link Charset#defaultCharset()}
     *
     * @param inputStream
     *            the input stream
     * @return  {@link java.io.InputStream} ?string
     * @see #inputStream2String(InputStream, String)
     */
    public static String inputStream2String(InputStream inputStream) {
        Charset defaultCharset = Charset.defaultCharset();
        String charsetName = defaultCharset.name();
        LOGGER.debug("the param defaultCharset:[{}]", charsetName);
        return inputStream2String(inputStream, charsetName);
    }

    /**
     *  {@link java.io.InputStream} ?string.<br>
     * ?cmd, ??,? <code>charsetName</code>.
     *
     * @param inputStream
     *            the input stream
     * @param charsetName
     *            ?? charset ??
     * @return  {@link java.io.InputStream} ?string
     * @see #toBufferedReader(InputStream, String)
     * @see ReaderUtil#toString(Reader)
     */
    public static String inputStream2String(InputStream inputStream, String charsetName) {
        BufferedReader bufferedReader = toBufferedReader(inputStream, charsetName);
        return ReaderUtil.toString(bufferedReader);
    }

    /**
     *  {@link java.io.InputStream} ? {@link java.io.BufferedReader} ({@link java.io.BufferedReader}  ?).
     *
     * @param inputStream
     *            the input stream
     * @param charsetName
     *            the charset name
     * @return the buffered reader
     * @see java.io.BufferedReader
     * @see java.io.InputStreamReader#InputStreamReader(InputStream, String)
     * @see org.apache.commons.io.IOUtils#toBufferedReader(Reader)
     */
    public static BufferedReader toBufferedReader(InputStream inputStream, String charsetName) {
        try {
            Reader reader = new InputStreamReader(inputStream, charsetName);

            //  ?  bufferedReader 
            //  read() ?? Reader FileReader  InputStreamReader.
            return org.apache.commons.io.IOUtils.toBufferedReader(reader);
        } catch (UnsupportedEncodingException e) {
            throw new UncheckedIOException(e);
        }
    }
}