org.apache.commons.lang3.StringUtils得使用

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package com.zheting.my.utils;import java.nio.charset.Charset;import org.apache.commons.lang3.StringUtils;public class MyStringUtils {/*** public static String abbreviate(String str, int maxWidth) * 字符串 简写 缩写*/public void test02() {System.out.println(StringUtils.abbreviate(null, 1)); // nullSystem.out.println(StringUtils.abbreviate("", 4)); // "";System.out.println(StringUtils.abbreviate("abcdefg", 6)); // "abc...";System.out.println(StringUtils.abbreviate("abcdefg", 7)); // "abcdefg"System.out.println(StringUtils.abbreviate("abcdefg", 8)); // "abcdefg"System.out.println(StringUtils.abbreviate("abcdefg", 4)); // "a..."System.out.println(StringUtils.abbreviate("abcdefg", 3)); // IllegalArgumentException}/*** public static String abbreviate(String str, int offset, int maxWidth) * 字符串 简写 缩写*/public void test03() {System.out.println(StringUtils.abbreviate(null, 0, 4)); // nullSystem.out.println(StringUtils.abbreviate("", 0, 4)); // ""System.out.println(StringUtils.abbreviate("abcdefghijklmno", -1, 10));// "abcdefg..."System.out.println(StringUtils.abbreviate("abcdefghijklmno", 0, 10));// "abcdefg..."System.out.println(StringUtils.abbreviate("abcdefghijklmno", 1, 10));// "abcdefg..."System.out.println(StringUtils.abbreviate("abcdefghijklmno", 4, 10));// "abcdefg..."System.out.println(StringUtils.abbreviate("abcdefghijklmno", 5, 10));// "...fghi..."System.out.println(StringUtils.abbreviate("abcdefghijklmno", 6, 10));// "...ghij..."System.out.println(StringUtils.abbreviate("abcdefghijklmno", 8, 10));// "...ijklmno"System.out.println(StringUtils.abbreviate("abcdefghijklmno", 10, 10));// "...ijklmno"System.out.println(StringUtils.abbreviate("abcdefghijklmno", 12, 10));// "...ijklmno"System.out.println(StringUtils.abbreviate("abcdefghij", 0, 3));// IllegalArgumentExceptionSystem.out.println(StringUtils.abbreviate("abcdefghij", 5, 6));// IllegalArgumentException}/*** public static String difference(String str1, String str2)* 比较两个字符串，返回字符串str2和str1不同的部分*/public void test04() {System.out.println(StringUtils.difference(null, null));// nullSystem.out.println(StringUtils.difference("", ""));// ""System.out.println(StringUtils.difference("", "abc"));// "abc"System.out.println(StringUtils.difference("abc", ""));// ""System.out.println(StringUtils.difference("abc", "abc"));// ""System.out.println(StringUtils.difference("abc", "ab"));// ""System.out.println(StringUtils.difference("ab", "abxyz"));// "xyz"System.out.println(StringUtils.difference("abcde", "abxyz"));// "xyz"System.out.println(StringUtils.difference("abcde", "xyz"));// "xyz"}/*** public static int indexOfDifference(CharSequence cs1, CharSequence cs2)* cs1和cs2比较，返回cs2与cs1开始不同的索引值*/public void test05() {System.out.println(StringUtils.indexOfDifference(null, null));// -1System.out.println(StringUtils.indexOfDifference("", ""));// -1System.out.println(StringUtils.indexOfDifference("", "abc"));// 0System.out.println(StringUtils.indexOfDifference("abc", ""));// 0System.out.println(StringUtils.indexOfDifference("abc", "abc"));// -1System.out.println(StringUtils.indexOfDifference("ab", "abxyz"));// 2System.out.println(StringUtils.indexOfDifference("abcde", "abxyz"));// 2System.out.println(StringUtils.indexOfDifference("abcde", "xyz"));// 0}/*** public static boolean startsWith(CharSequence str, CharSequence prefix)* 判断str是否以prefix开头*/public void test06() {System.out.println(StringUtils.startsWith(null, null));// trueSystem.out.println(StringUtils.startsWith(null, "abc"));// falseSystem.out.println(StringUtils.startsWith("abcdef", null));// falseSystem.out.println(StringUtils.startsWith("abcdef", "abc"));// trueSystem.out.println(StringUtils.startsWith("ABCDEF", "abc"));// false}/*** public static boolean startsWithIgnoreCase(CharSequence str, CharSequence prefix) * 判断str是否以prefix开头,但是忽略大小写*/public void test07() {System.out.println(StringUtils.startsWithIgnoreCase(null, null));// trueSystem.out.println(StringUtils.startsWithIgnoreCase(null, "abc"));// falseSystem.out.println(StringUtils.startsWithIgnoreCase("abcdef", null));// falseSystem.out.println(StringUtils.startsWithIgnoreCase("abcdef", "abc"));// trueSystem.out.println(StringUtils.startsWithIgnoreCase("ABCDEF", "abc"));// true}/*** public static boolean startsWithAny(CharSequence string, CharSequence...searchStrings)* 第二个不定参数中的任何一个字符和第一个参数的开头相同，就返回true*/public void test08() {System.out.println(StringUtils.startsWithAny(null, null));// falseSystem.out.println(StringUtils.startsWithAny(null,new String[] { "abc" }));// falseSystem.out.println(StringUtils.startsWithAny("abcxyz", null));// falseSystem.out.println(StringUtils.startsWithAny("abcxyz",new String[] { "" }));// falseSystem.out.println(StringUtils.startsWithAny("abcxyz",  new String[] { "abc" }));// trueSystem.out.println(StringUtils.startsWithAny("abcxyz", new String[] {null, "xyz", "abc" }));// true}/*** public static boolean endsWith(CharSequence str, CharSequence suffix) * 判断str是否以suffix结尾*/public void test09(){System.out.println(StringUtils.endsWith(null, null));// trueSystem.out.println(StringUtils.endsWith(null, "def"));// falseSystem.out.println( StringUtils.endsWith("abcdef", null));// falseSystem.out.println(StringUtils.endsWith("abcdef", "def"));// trueSystem.out.println( StringUtils.endsWith("ABCDEF", "def"));// falseSystem.out.println( StringUtils.endsWith("ABCDEF", "cde"));// false}/*** public static boolean endsWithAny(CharSequence string,  CharSequence... searchStrings)* 第一个参数string以不定参数searchStrings中的任何一个结尾，返回true*/public void test10(){System.out.println( StringUtils.endsWithAny(null, null));// falseSystem.out.println( StringUtils.endsWithAny(null, new String[] {"abc"}));// falseSystem.out.println( StringUtils.endsWithAny("abcxyz", null) );// falseSystem.out.println( StringUtils.endsWithAny("abcxyz", new String[] {""}));// trueSystem.out.println(StringUtils.endsWithAny("abcxyz", new String[] {"xyz"}));// trueSystem.out.println( StringUtils.endsWithAny("abcxyz", new String[] {null, "xyz", "abc"}));// trueSystem.out.println( StringUtils.endsWithAny("abcxyz", new String[] {null, "XYZ", "abc"}));// false}/*** public static String normalizeSpace(String str)* 去掉前后的空格，以及中间多余的空格，只保留一个空格*/public void test11(){String str = "   aa     cc  bb dd            ee        "; //aa cc bb dd eeSystem.out.println(StringUtils.normalizeSpace(str));}/*** public static String appendIfMissing(String str, CharSequence suffix,  CharSequence... suffixes)* Appends the suffix to the end of the string if the string does not already end with any the suffixes.* 如果str不是以suffixes中的任何一个结尾，那么把suffix添加到str后面。区分大小写*/public void test12(){//因为suffixes是不定参数，因此可以省略System.out.println(StringUtils.appendIfMissing(null, null));// nullSystem.out.println(StringUtils.appendIfMissing("abc", null) );// "abc"System.out.println(StringUtils.appendIfMissing("", "xyz") );// "xyz"System.out.println(StringUtils.appendIfMissing("abc", "xyz"));// "abcxyz"System.out.println(StringUtils.appendIfMissing("abcxyz", "xyz"));// "abcxyz"System.out.println(StringUtils.appendIfMissing("abcXYZ", "xyz"));// "abcXYZxyz"System.out.println(StringUtils.appendIfMissing(null, null, null));// nullSystem.out.println(StringUtils.appendIfMissing("abc", null, null));// "abc"System.out.println( StringUtils.appendIfMissing("", "xyz", null));// "xyz"System.out.println( StringUtils.appendIfMissing("abc", "xyz", new CharSequence[]{null}) );// "abcxyz"System.out.println(StringUtils.appendIfMissing("abc", "xyz", ""));// "abc"System.out.println( StringUtils.appendIfMissing("abc", "xyz", "mno"));// "abcxyz"System.out.println( StringUtils.appendIfMissing("abcxyz", "xyz", "mno"));// "abcxyz"  后缀本来就和添加的相同的，就不提添加System.out.println(StringUtils.appendIfMissing("abcmno", "xyz", "mno"));// "abcmno"System.out.println( StringUtils.appendIfMissing("abcXYZ", "xyz", "mno"));// "abcXYZxyz"System.out.println(StringUtils.appendIfMissing("abcMNO", "xyz", "mno") );// "abcMNOxyz"}/*** public static String appendIfMissingIgnoreCase(String str, CharSequence suffix, CharSequence... suffixes)* Appends the suffix to the end of the string if the string does not already end, case insensitive, with any of the suffixes.*  如果str不是以suffixes中的任何一个结尾，那么把suffix添加到str后面。不区分大小写*/public void test13(){System.out.println(StringUtils.appendIfMissingIgnoreCase(null, null) );// nullSystem.out.println( StringUtils.appendIfMissingIgnoreCase("abc", null) );// "abc"System.out.println( StringUtils.appendIfMissingIgnoreCase("", "xyz"));// "xyz"System.out.println( StringUtils.appendIfMissingIgnoreCase("abc", "xyz") );// "abcxyz"System.out.println(StringUtils.appendIfMissingIgnoreCase("abcxyz", "xyz"));// "abcxyz"System.out.println( StringUtils.appendIfMissingIgnoreCase("abcXYZ", "xyz"));// "abcXYZ"System.out.println(StringUtils.appendIfMissingIgnoreCase(null, null, null) );// nullSystem.out.println(StringUtils.appendIfMissingIgnoreCase("abc", null, null));// "abc"System.out.println( StringUtils.appendIfMissingIgnoreCase("", "xyz", null) );// "xyz"System.out.println(StringUtils.appendIfMissingIgnoreCase("abc", "xyz", new CharSequence[]{null}) );// "abcxyz"System.out.println( StringUtils.appendIfMissingIgnoreCase("abc", "xyz", "") );// "abc"System.out.println(StringUtils.appendIfMissingIgnoreCase("abc", "xyz", "mno") );// "axyz"System.out.println( StringUtils.appendIfMissingIgnoreCase("abcxyz", "xyz", "mno") );// "abcxyz"System.out.println( StringUtils.appendIfMissingIgnoreCase("abcmno", "xyz", "mno"));// "abcmno"System.out.println(StringUtils.appendIfMissingIgnoreCase("abcXYZ", "xyz", "mno") );// "abcXYZ"System.out.println(StringUtils.appendIfMissingIgnoreCase("abcMNO", "xyz", "mno"));// "abcMNO"}/*** public static String prependIfMissing(String str,  CharSequence prefix, CharSequence... prefixes)* Prepends the prefix to the start of the string if the string does not already start with any of the prefixes.* 如果str以prefixs中的任何一个开头，那么把prefix添加到str的开头。区分大小写。注意prefix和str的开头相同，也不添加。*/public void test14(){System.out.println(StringUtils.prependIfMissing(null, null));// nullSystem.out.println(StringUtils.prependIfMissing("abc", null));// "abc"System.out.println(StringUtils.prependIfMissing("", "xyz"));// "xyz"System.out.println(StringUtils.prependIfMissing("abc", "xyz"));// "xyzabc"System.out.println(StringUtils.prependIfMissing("xyzabc", "xyz"));// "xyzabc"System.out.println(StringUtils.prependIfMissing("XYZabc", "xyz"));// "xyzXYZabc"System.out.println(StringUtils.prependIfMissing(null, null, null));// nullSystem.out.println(StringUtils.prependIfMissing("abc", null, null));// "abc"System.out.println(StringUtils.prependIfMissing("", "xyz", null));// "xyz"System.out.println(StringUtils.prependIfMissing("abc", "xyz", new CharSequence[]{null}));// "xyzabc"System.out.println(StringUtils.prependIfMissing("abc", "xyz", "") );// "abc"System.out.println(StringUtils.prependIfMissing("abc", "xyz", "mno"));// "xyzabc"System.out.println(StringUtils.prependIfMissing("xyzabc", "xyz", "mno"));// "xyzabc"System.out.println(StringUtils.prependIfMissing("mnoabc", "xyz", "mno"));// "mnoabc"System.out.println(StringUtils.prependIfMissing("XYZabc", "xyz", "mno"));// "xyzXYZabc"System.out.println(StringUtils.prependIfMissing("MNOabc", "xyz", "mno"));// "xyzMNOabc"}/*** public static String prependIfMissingIgnoreCase(String str, CharSequence prefix,  CharSequence... prefixes)* Prepends the prefix to the start of the string if the string does not already start, case insensitive, with any of the prefixes.* 如果str以prefixs中的任何一个开头，那么把prefix添加到str的开头。不区分大小写。注意prefix和str的开头相同，也不添加。*/public void test15(){System.out.println(StringUtils.prependIfMissingIgnoreCase(null, null));// nullSystem.out.println(StringUtils.prependIfMissingIgnoreCase("abc", null));// "abc"System.out.println(StringUtils.prependIfMissingIgnoreCase("", "xyz"));// "xyz"System.out.println(StringUtils.prependIfMissingIgnoreCase("abc", "xyz"));// "xyzabc"System.out.println(StringUtils.prependIfMissingIgnoreCase("xyzabc", "xyz"));// "xyzabc"System.out.println(StringUtils.prependIfMissingIgnoreCase("XYZabc", "xyz"));// "XYZabc"System.out.println(StringUtils.prependIfMissingIgnoreCase(null, null, null));// nullSystem.out.println(StringUtils.prependIfMissingIgnoreCase("abc", null, null));// "abc"System.out.println(StringUtils.prependIfMissingIgnoreCase("", "xyz", null));// "xyz"System.out.println(StringUtils.prependIfMissingIgnoreCase("abc", "xyz", new CharSequence[]{null}));// "xyzabc"System.out.println(StringUtils.prependIfMissingIgnoreCase("abc", "xyz", ""));// "abc"System.out.println(StringUtils.prependIfMissingIgnoreCase("abc", "xyz", "mno"));// "xyzabc"System.out.println(StringUtils.prependIfMissingIgnoreCase("xyzabc", "xyz", "mno"));// "xyzabc"System.out.println(StringUtils.prependIfMissingIgnoreCase("mnoabc", "xyz", "mno"));// "mnoabc"System.out.println(StringUtils.prependIfMissingIgnoreCase("XYZabc", "xyz", "mno"));// "XYZabc"System.out.println(StringUtils.prependIfMissingIgnoreCase("MNOabc", "xyz", "mno"));// "MNOabc"}/*** public static String toEncodedString(byte[] bytes,   Charset charset)* 把字节数组bytes按照指定的字符集编码，返回新的字符串。*/public void test16(){System.out.println(StringUtils.toEncodedString("abc".getBytes(), Charset.forName("gbk")));}public static void main(String[] args) {new MyStringUtils().test16();}
}

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