java读取文档

补充记录一下。

指定编码

FileInputStream in = new FileInputStream("aaa.txt");
byte[] data = new byte[1024 * 8];
StringBuilder sb = new StringBuilder();
while(in.read(data) > 0) {
   sb.append(new String(data,"utf8"); // 指定编码格式，避免乱码
}
System.out.println(sb.toString());

未知编码获取

1、引用

<!-- https://mvnrepository.com/artifact/net.sourceforge.cpdetector/cpdetector -->
 <dependency>
    <groupId>net.sourceforge.cpdetector</groupId>
    <artifactId>cpdetector</artifactId>
    <version>1.0.7</version>
 </dependency>

2、工具类

    public static String getFileEncode(String filePath) {
        String charsetName = null;
        try {
            File file = new File(filePath);
            CodepageDetectorProxy detector = CodepageDetectorProxy.getInstance();
            detector.add(new ParsingDetector(false));
            detector.add(JChardetFacade.getInstance());
            detector.add(ASCIIDetector.getInstance());
            detector.add(UnicodeDetector.getInstance());
            java.nio.charset.Charset charset = null;
            charset = detector.detectCodepage(file.toURI().toURL());
            if (charset != null) {
                charsetName = charset.name();
            } else {
                charsetName = "UTF-8";
            }
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
        return charsetName;
    }