StringUtils.tokenizeToStringArray()

雨点打透心脏的1/2处 2022-11-09 14:09 126阅读 0赞

读Spring源码的时候，遇到这么个东西，记录一下

**BeanDefinitionParserDelegate**

/** * Parses the supplied {@code <bean>} element. May return {@code null} * if there were errors during parse. Errors are reported to the * {@link org.springframework.beans.factory.parsing.ProblemReporter}. */
    @Nullable
    public BeanDefinitionHolder parseBeanDefinitionElement(Element ele, @Nullable BeanDefinition containingBean) { 
        // 解析ID属性
        String id = ele.getAttribute(ID_ATTRIBUTE);
        // 解析Name属性
        String nameAttr = ele.getAttribute(NAME_ATTRIBUTE);
     
        List<String> aliases = new ArrayList<>();
        if (StringUtils.hasLength(nameAttr)) { 
            String[] nameArr = StringUtils.tokenizeToStringArray(nameAttr, MULTI_VALUE_ATTRIBUTE_DELIMITERS);
            aliases.addAll(Arrays.asList(nameArr));
        }
    }

将字符串按照指定的字符转换成String\[\]数组，如字符串中不包含指定字符，则将整个字符串放进数组。如指定字符有多个，是分别按单个字符来切割的。 字符串： “made,in;china” 指定字符： “,;” 返回数组：\[made, in, china\]

/** * Tokenize the given {@code String} into a {@code String} array via a * {@link StringTokenizer}. * <p>Trims tokens and omits empty tokens. * <p>The given {@code delimiters} string can consist of any number of * delimiter characters. Each of those characters can be used to separate * tokens. A delimiter is always a single character; for multi-character * delimiters, consider using {@link #delimitedListToStringArray}. * @param str the {@code String} to tokenize (potentially {@code null} or empty) * @param delimiters the delimiter characters, assembled as a {@code String} * (each of the characters is individually considered as a delimiter) * @return an array of the tokens * @see java.util.StringTokenizer * @see String#trim() * @see #delimitedListToStringArray */
    public static String[] tokenizeToStringArray(@Nullable String str, String delimiters) { 
        return tokenizeToStringArray(str, delimiters, true, true);
    }
     
    /** * Tokenize the given {@code String} into a {@code String} array via a * {@link StringTokenizer}. * <p>The given {@code delimiters} string can consist of any number of * delimiter characters. Each of those characters can be used to separate * tokens. A delimiter is always a single character; for multi-character * delimiters, consider using {@link #delimitedListToStringArray}. * @param str the {@code String} to tokenize (potentially {@code null} or empty) * @param delimiters the delimiter characters, assembled as a {@code String} * (each of the characters is individually considered as a delimiter) * @param trimTokens trim the tokens via {@link String#trim()} * @param ignoreEmptyTokens omit empty tokens from the result array * (only applies to tokens that are empty after trimming; StringTokenizer * will not consider subsequent delimiters as token in the first place). * @return an array of the tokens * @see java.util.StringTokenizer * @see String#trim() * @see #delimitedListToStringArray */
    public static String[] tokenizeToStringArray(
            @Nullable String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens) { 
     
        if (str == null) { 
            return new String[0];
        }
     
        StringTokenizer st = new StringTokenizer(str, delimiters);
        List<String> tokens = new ArrayList<>();
        while (st.hasMoreTokens()) { 
            String token = st.nextToken();
            if (trimTokens) { 
                token = token.trim();
            }
            if (!ignoreEmptyTokens || token.length() > 0) { 
                tokens.add(token);
            }
        }
        return toStringArray(tokens);
    }

测试代码：

public class MyTest { 
     
        public static final String MULTI_VALUE_ATTRIBUTE_DELIMITERS = ",; ";
        @Test
        public void test() { 
            String nameAttr = "made,in;china";
            String flag = MULTI_VALUE_ATTRIBUTE_DELIMITERS;
            String[] nameArr = StringUtils.tokenizeToStringArray(nameAttr, MULTI_VALUE_ATTRIBUTE_DELIMITERS);
            System.out.println(Arrays.toString(nameArr));
        }
        @Test
        public void test2() { 
            String nameAttr = "madeinchina";
            String flag = MULTI_VALUE_ATTRIBUTE_DELIMITERS;
            String[] nameArr = StringUtils.tokenizeToStringArray(nameAttr, MULTI_VALUE_ATTRIBUTE_DELIMITERS);
            System.out.println(Arrays.toString(nameArr));
        }
    }

> test输出结果：\[made, in, china\]  
> test2输出结果：\[madeinchina\]

StringUtils.tokenizeToStringArray()

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