StreamUtil

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/**
 * 流操作
 * 
 * @author chenxin
 * @version [版本号, 2012-5-21]
 * @see [相关类/方法]
 * @since [产品/模块版本]
 */
public class StreamUtil {

	// 从文件读取数据
    public static byte[] getContentFromFile(String filePath) throws IOException
    {
        FileInputStream fin = new FileInputStream(filePath);
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        int n = -1;
        byte[] buf = new byte[1024];
        while ((n = fin.read(buf)) != -1)
        {
            os.write(buf, 0, n);
        }
        fin.close();
        return os.toByteArray();
    }

    // 写数据到文件
    public static void writeContentToFile(String filePath, byte[] content) throws IOException
    {
        FileOutputStream fout = new FileOutputStream(filePath, false);

        fout.write(content);

        fout.close();

    }

    // 从输入流读取数据
    public static byte[] getContentFromInputStream(InputStream in) throws IOException
    {
        return getContentFromInputStream(in, Integer.MAX_VALUE);
    }

    // 从输入流读取数据
    public static byte[] getContentFromInputStream(InputStream in, int length) throws IOException
    {
        ByteArrayOutputStream os = new ByteArrayOutputStream();

        byte[] buf = new byte[1024];
        while (os.size() < length)
        {
            int n = in.read(buf);
            if (n > 0)
            {
                os.write(buf, 0, n);
            }
            else if (n < 0)
            {
                break;
            }
        }
        in.close();
        return os.toByteArray();
    }

    // 从输入流读取数据
    public static String getContentStrFromInputStream(InputStream in) throws IOException
    {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        byte[] buf = new byte[1024];
        int iCnt = 0;
        while ((iCnt = in.read(buf)) > 0)
        {
            os.write(buf, 0, iCnt);
        }
        in.close();
        return os.toString("UTF-8");
    }

    public static void main(String[] args)
    {
    }

    /**
     * 将输入流的内容全部输出到输出流
     * 
     * @param is 输入流
     * @param os 输出流
     * @throws IOException
     */
    public static void copy(InputStream is, OutputStream os) throws IOException
    {
        synchronized (is)
        {
            synchronized (os)
            {
                byte[] buffer = new byte[256];
                while (true)
                {
                    int bytesRead = is.read(buffer);
                    if (bytesRead == -1)
                    {
                        break;
                    }
                    os.write(buffer, 0, bytesRead);
                }
            }
        }
    }


}