Java出现中文乱码问题分析及解决方案

String content = "中文内容";
byte[] utf8Bytes = content.getBytes("UTF-8");

// 读取时使用UTF-8编码
String decodedContent = new String(utf8Bytes, "UTF-8");
System.out.println(decodedContent);

// 读取文件时指定字符集
try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("file.txt"), StandardCharsets.UTF_8))) {
    String line;
    while ((line = reader.readLine()) != null) {
        System.out.println(line);
    }
}

// 写入文件时指定字符集
try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("output.txt"), StandardCharsets.UTF_8))) {
    writer.write("写入内容");
}

File file = new File("file.txt");
CharsetDetector detector = new CharsetDetector();
try {
    detector.setText(file);
    CharsetMatch match = detector.detect();
    String detectedCharset = match.getName();
    System.out.println("Detected Charset: " + detectedCharset);
} catch (IOException e) {
    e.printStackTrace();
}

// 使用Charset和CharsetDecoder进行字符集转换
Charset utf8Charset = Charset.forName("UTF-8");
CharsetDecoder utf8Decoder = utf8Charset.newDecoder();
ByteBuffer buffer = ByteBuffer.wrap(data); // data是字节数组
CharBuffer charBuffer = utf8Decoder.decode(buffer);

System.out.println(charBuffer.toString());