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spring框架中一个跟String的trim方法一样的方法
@Test public void testTrimWhitespace() throws Exception { assertEquals(null, StringUtils.trimWhitespace(null)); assertEquals("", StringUtils.trimWhitespace("")); assertEquals("", StringUtils.trimWhitespace(" ")); assertEquals("", StringUtils.trimWhitespace("\t")); assertEquals("a", StringUtils.trimWhitespace(" a")); assertEquals("a", StringUtils.trimWhitespace("a ")); assertEquals("a", StringUtils.trimWhitespace(" a ")); assertEquals("a b", StringUtils.trimWhitespace(" a b ")); assertEquals("a b c", StringUtils.trimWhitespace(" a b c ")); assertEquals("a b c", StringUtils.trimWhitespace("\r\f\n a b c \t")); }
可以看到这个方法可以处理
\n 回车(\u000a)
\t 水平制表符(\u0009)
\r 换行(\u000d)
\f 换页(\u000c)
其实跟java的String方法的trim可以实现一样的功能
/** * Trim leading and trailing whitespace from the given String. * @param str the String to check * @return the trimmed String * @see java.lang.Character#isWhitespace */ public static String trimWhitespace(String str) { if (!hasLength(str)) { return str; } StringBuilder sb = new StringBuilder(str); while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) { sb.deleteCharAt(0); } while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) { sb.deleteCharAt(sb.length() - 1); } return sb.toString(); }
/** * Check that the given String is neither {@code null} nor of length 0. * Note: Will return {@code true} for a String that purely consists of whitespace. * @param str the String to check (may be {@code null}) * @return {@code true} if the String is not null and has length * @see #hasLength(CharSequence) */ public static boolean hasLength(String str) { return hasLength((CharSequence) str); }
/** * Check that the given CharSequence is neither {@code null} nor of length 0. * Note: Will return {@code true} for a CharSequence that purely consists of whitespace. * <p><pre class="code"> * StringUtils.hasLength(null) = false * StringUtils.hasLength("") = false * StringUtils.hasLength(" ") = true * StringUtils.hasLength("Hello") = true * </pre> * @param str the CharSequence to check (may be {@code null}) * @return {@code true} if the CharSequence is not null and has length * @see #hasText(String) */ public static boolean hasLength(CharSequence str) { return (str != null && str.length() > 0); }
spring框架中一个跟String的trim方法一样的方法
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