Как преобразовать InputStream в строку

С использованием библиотеки Apache Commons IO:

String fileContent = null;
try (InputStream inputStream = new FileInputStream("myfilename.txt")) {
    fileContent = IOUtils.toString(inputStream, "utf-8");
}

String fileContent = null;

try (InputStream inputStream = new FileInputStream("myfilename.txt")) {

fileContent = IOUtils.toString(inputStream, "utf-8");

}

На чистой Java без библиотек:

    InputStream inputStream = new ByteArrayInputStream("Тестовая строка. Давайте строем ходить в боа.".getBytes("utf-8"));
    String result = "";
    try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "utf-8"))) {
        final int BUFFER_SIZE = 10;
        char[] buff = new char[BUFFER_SIZE];
        int charsReaded;
        StringBuilder stringBuilder = new StringBuilder();
        while ((charsReaded = reader.read(buff)) != -1) {
             stringBuilder.append(new String(buff, 0, charsReaded));
        }
        result = stringBuilder.toString();
    }
    System.out.println("result=" + result);

InputStream inputStream = new ByteArrayInputStream("Тестовая строка. Давайте строем ходить в боа.".getBytes("utf-8"));

String result = "";

try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "utf-8"))) {

final int BUFFER_SIZE = 10;

char[] buff = new char[BUFFER_SIZE];

int charsReaded;

StringBuilder stringBuilder = new StringBuilder();

while ((charsReaded = reader.read(buff)) != -1) {

stringBuilder.append(new String(buff, 0, charsReaded));

}

result = stringBuilder.toString();

}

System.out.println("result=" + result);

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