com.alibaba.bytekit.utils.IOUtils Maven / Gradle / Ivy

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package com.alibaba.bytekit.utils;

import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.util.zip.ZipFile;

/**
 *
 * @author hengyunabc 2018-11-06
 *
 */
public class IOUtils {

    private IOUtils() {
    }

    public static String toString(InputStream inputStream) throws IOException {
        if (inputStream == null) {
            return null;
        }
        ByteArrayOutputStream result = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int length;
        while ((length = inputStream.read(buffer)) != -1) {
            result.write(buffer, 0, length);
        }
        return result.toString("UTF-8");
    }

    public static void copy(InputStream in, OutputStream out) throws IOException {
        byte[] buffer = new byte[1024];
        int len;
        while ((len = in.read(buffer)) != -1) {
            out.write(buffer, 0, len);
        }
    }

    /**
     * @return a byte[] containing the information contained in the specified
     *         InputStream.
     * @throws java.io.IOException
     */
    public static byte[] getBytes(InputStream input) throws IOException {
        if (input == null) {
            return null;
        }
        ByteArrayOutputStream result = new ByteArrayOutputStream();
        copy(input, result);
        result.close();
        return result.toByteArray();
    }

    public static IOException close(InputStream input) {
        return close((Closeable) input);
    }

    public static IOException close(OutputStream output) {
        return close((Closeable) output);
    }

    public static IOException close(final Reader input) {
        return close((Closeable) input);
    }

    public static IOException close(final Writer output) {
        return close((Closeable) output);
    }

    public static IOException close(final Closeable closeable) {
        try {
            if (closeable != null) {
                closeable.close();
            }
        } catch (final IOException ioe) {
            return ioe;
        }
        return null;
    }

    // support jdk6
    public static IOException close(final ZipFile zip) {
        try {
            if (zip != null) {
                zip.close();
            }
        } catch (final IOException ioe) {
            return ioe;
        }
        return null;
    }
}