public static PrintWriter getPrintWriter(File file, String charset, boolean isAppend) throws IORuntimeException {
		return new PrintWriter(getWriter(file, charset, isAppend));
	}
public static PrintWriter getPrintWriter ( File file , String charset , boolean isAppend ) throws IORuntimeException { return new PrintWriter ( getWriter ( file , charset , isAppend ) ) ; }
获得一个打印写入对象，可以有print

@param file 文件
@param charset 字符集
@param isAppend 是否追加
@return 打印对象
@throws IORuntimeException IO异常