src/org/nutz/lang/Streams.java
public static BufferedReader buffr(Reader reader) {
        if (reader instanceof BufferedReader)
            return (BufferedReader) reader;
        return new BufferedReader(reader);
    }
public static BufferedReader buffr(Reader reader) {
        if (reader instanceof BufferedReader)
            return (BufferedReader) reader;
        return new BufferedReader(reader);
    }
为一个文本输入流包裹一个缓冲流。如果这个输入流本身就是缓冲流，则直接返回

@param reader
文本输入流。
@return 缓冲文本输入流