StreamTool 字节流保存，字节流读取下一行，读取流

在读取流的过程中，有时会不确定是否是字节流或者是字符流，统一用字节流读取，然后对流进行处理：

public class StreamTool {    /**     * 将字节流保存到文件中     * @param file     * @param data     * @throws Exception     */    public static void save(File file, byte[] data) throws Exception {        FileOutputStream outStream = new FileOutputStream(file);        outStream.write(data);        outStream.close();    }    /**     * 读取下一行     * @param in     * @return String     * @throws IOException     */    public static String readLine(PushbackInputStream in) throws IOException {        char buf[] = new char[128];        int room = buf.length;        int offset = 0;        int c;        loop:       while (true) {            switch (c = in.read()) {                case -1:                case '\n':                    break loop;                case '\r':                    int c2 = in.read();                    if ((c2 != '\n') && (c2 != -1)) in.unread(c2);                    break loop;                default:                    if (--room < 0) {                        char[] lineBuffer = buf;                        buf = new char[offset + 128];                        room = buf.length - offset - 1;                        System.arraycopy(lineBuffer, 0, buf, 0, offset);                    }                    buf[offset++] = (char) c;                    break;            }        }        if ((c == -1) && (offset == 0)) return null;        return String.copyValueOf(buf, 0, offset);    }    /**     * 读取流     * @param inStream     * @return 字节数组     * @throws Exception     */    public static byte[] readStream(InputStream inStream) throws Exception{        ByteArrayOutputStream outSteam = new ByteArrayOutputStream();        byte[] buffer = new byte[1024];        int len = -1;        while( (len=inStream.read(buffer)) != -1){            outSteam.write(buffer, 0, len);        }        outSteam.close();        inStream.close();        return outSteam.toByteArray();    }} 

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