java - SonarQube 说我 "remove this use of constructor "扫描仪(InputStream)”

Question

我应该使用什么来代替扫描仪，这样 SonarQube 就不会提示？

final Scanner scan = new Scanner(System.in);

Answer 1

这是因为以下rule在 SonarQube 中:

Classes and methods that rely on the default system encoding should not be used

Using classes and methods that rely on the default system encoding can result in code that works fine in its "home" environment. But that code may break for customers who use different encodings in ways that are extremely difficult to diagnose and nearly, if not completely, impossible to reproduce when it's time to fix them.

要修复此问题，您可以使用具有定义的编码类型的扫描仪:

/**
 * Constructs a new <code>Scanner</code> that produces values scanned
 * from the specified input stream. Bytes from the stream are converted
 * into characters using the specified charset.
 *
 * @param  source An input stream to be scanned
 * @param charsetName The encoding type used to convert bytes from the
 *        stream into characters to be scanned
 * @throws IllegalArgumentException if the specified character set
 *         does not exist
 */
public Scanner(InputStream source, String charsetName) {
    this(makeReadable(Objects.requireNonNull(source, "source"), toCharset(charsetName)),
         WHITESPACE_PATTERN);
}