src/main/java/me/codeboy/common/base/io/util/CBFileUtil.java
public static String getFileContent(InputStream is) throws IOException {
        BufferedReader buff = new BufferedReader(new InputStreamReader(is,
                "UTF-8"));
        String content = getContent(buff);
        buff.close();
        return content;
    }
public static String getFileContent(InputStream is) throws IOException {
        BufferedReader buff = new BufferedReader(new InputStreamReader(is,
                "UTF-8"));
        String content = getContent(buff);
        buff.close();
        return content;
    }
按照UTF-8编码得到输入流内容

@param is 输入流
@return 文件内容
@throws IOException io exception