Java InputStream Copy copyStreamToString(InputStream input)

Description

Copy the data from an InputStream to a string using the default charset without closing the stream.

License

Apache License

Exception

Parameter	Description
IOException	an exception

Declaration

public static String copyStreamToString(InputStream input) throws IOException 

Method Source Code

//package com.java2s;
/**/*from   w  ww .j a v a  2s .c  o m*/
 * *****************************************************************************
 * Copyright 2011 See AUTHORS file.
 *
 * 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.
 *****************************************************************************
 */

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringWriter;

public class Main {
    public static final int DEFAULT_BUFFER_SIZE = 8192;

    /**
     * Copy the data from an {@link InputStream} to a string using the default
     * charset without closing the stream.
     *
     * @throws IOException
     */
    public static String copyStreamToString(InputStream input) throws IOException {
        return copyStreamToString(input, input.available());
    }

    /**
     * Copy the data from an {@link InputStream} to a string using the default
     * charset.
     *
     * @param approxStringLength Used to preallocate a possibly correct sized
     * StringBulder to avoid an array copy.
     * @throws IOException
     */
    public static String copyStreamToString(InputStream input, int approxStringLength) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        StringWriter w = new StringWriter(Math.max(0, approxStringLength));
        char[] buffer = new char[DEFAULT_BUFFER_SIZE];

        int charsRead;
        while ((charsRead = reader.read(buffer)) != -1) {
            w.write(buffer, 0, charsRead);
        }

        return w.toString();
    }

    /**
     * Reads the contents of the supplied stream into a string using the
     * platform default charset.
     */
    public static String toString(InputStream stream) throws IOException {
        return copy(stream, new ByteArrayOutputStream()).toString();
    }

    /**
     * Reads the contents of the supplied stream into a string using the
     * supplied {@link Charset}.
     */
    public static String toString(InputStream stream, String charset) throws IOException {
        return copy(stream, new ByteArrayOutputStream()).toString(charset);
    }

    /**
     * Reads the contents of the supplied reader into a string.
     */
    public static String toString(Reader reader) throws IOException {
        char[] inbuf = new char[4096];
        StringBuilder outbuf = new StringBuilder();
        for (int read = 0; (read = reader.read(inbuf)) > 0;) {
            outbuf.append(inbuf, 0, read);
        }
        return outbuf.toString();
    }

    /**
     * Copies the contents of the supplied input stream to the supplied output
     * stream.
     */
    public static <T extends OutputStream> T copy(InputStream in, T out) throws IOException {
        byte[] buffer = new byte[4096];
        for (int read = 0; (read = in.read(buffer)) > 0;) {
            out.write(buffer, 0, read);
        }
        return out;
    }
}

Related

1. copyStreamBytes(InputStream is)
2. copyStreamToByteArray(InputStream in, byte[] dest, int off, int len)
3. copyStreamToBytes(InputStream inputStream)
4. copyStreamToString(InputStream input)
5. copyStreamToString(InputStream input)
6. copyStreamToString(InputStream inputStream, String encoding)
7. copyStreamToWriter(InputStream in, Writer out, String encoding, boolean close)
8. copyStreamToWriter(InputStream inStream, Writer writer)