Springboot 源碼學習

1.判斷字符串長度是否爲零

Assert.hasLength(encoding, "Encoding must not be empty");

public static void hasLength(String text, String message) {
        if (!StringUtils.hasLength(text)) {
            throw new IllegalArgumentException(message);
        }
    }

public static boolean hasLength(String str) {
        return hasLength((CharSequence)str);
    }

public static boolean hasLength(CharSequence str) {
        return str != null && str.length() > 0;
    }