判断文本文件的编码类型

项目：Spring Boot 项目

在 pom.xml 文件中引入依赖：

<!-- https://mvnrepository.com/artifact/com.googlecode.juniversalchardet/juniversalchardet -->
<dependency>
    <groupId>com.googlecode.juniversalchardet</groupId>
    <artifactId>juniversalchardet</artifactId>
    <version>1.0.3</version>
</dependency>

public static String detector(String fileName) {
    String encode = null;
    BufferedInputStream bis = null;
    try {
        bis = new BufferedInputStream(new FileInputStream(fileName));
        int readSize;
        byte[] buffer = new byte[8 * 4096];
        UniversalDetector detector = new UniversalDetector(null);
        while ((readSize = bis.read(buffer)) > 0 && !detector.isDone()) {
            detector.handleData(buffer, 0, readSize);
        }
        detector.dataEnd();
        encode = detector.getDetectedCharset();
        detector.reset();
    } catch (Exception e) {
    } finally {
        if (bis != null) {
            try {
                bis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    //return encode;
    return encode.equalsIgnoreCase("UTF-8") ? "UTF-8" : "GBK";
}