org.springframework.util.StringUtils处理字符串

org.springframework.util.StringUtils处理字符串

API:http://7-sun.com/doc/spring2.5_doc_cn/org/springframework/util/StringUtils.html

org.springframework.util.StringUtils 工具类处理字符串。
工具类整理如下：

StringUtils.hasLength(null) = false  StringUtils.hasLength("") = false  StringUtils.hasLength(" ") = true  StringUtils.hasLength("Hello") = true    StringUtils.hasText(null) = false   StringUtils.hasText("") = false   StringUtils.hasText(" ") = false   StringUtils.hasText("12345") = true   StringUtils.hasText(" 12345 ") = true //是否包含空白字符  StringUtils.containsWhitespace(null)=false StringUtils.containsWhitespace("")=false StringUtils.containsWhitespace("a")=false StringUtils.containsWhitespace("abc")=false StringUtils.containsWhitespace("abc")=false StringUtils.containsWhitespace(" ")=true StringUtils.containsWhitespace(" a")=true StringUtils.containsWhitespace("abc ")=true StringUtils.containsWhitespace("a b")=true StringUtils.containsWhitespace("a  b") StringUtils.trimWhitespace(null)=null; StringUtils.trimWhitespace("")=""; StringUtils.trimWhitespace(" ")=""; StringUtils.trimWhitespace("\t")=""; StringUtils.trimWhitespace(" a")="a"; StringUtils.trimWhitespace("a ")="a"; StringUtils.trimWhitespace(" a ")="a"; StringUtils.trimWhitespace(" a b ")="a b"; StringUtils.trimLeadingWhitespace(null)=null; StringUtils.trimLeadingWhitespace("")=""; StringUtils.trimLeadingWhitespace(" ")=""; StringUtils.trimLeadingWhitespace("\t")=""; StringUtils.trimLeadingWhitespace(" a")="a"; StringUtils.trimLeadingWhitespace("a ")="a "; StringUtils.trimLeadingWhitespace(" a ")="a "; StringUtils.trimLeadingWhitespace(" a b ")="a b " StringUtils.trimLeadingWhitespace(" a b  c ")="a b  c " StringUtils.trimTrailingWhitespace(null)=null; StringUtils.trimTrailingWhitespace(" ")=""; StringUtils.trimTrailingWhitespace("\t")=""; StringUtils.trimTrailingWhitespace("a ")="a"; StringUtils.trimTrailingWhitespace(" a")=" a"; StringUtils.trimTrailingWhitespace(" a ")=" a"; StringUtils.trimTrailingWhitespace(" a b ")=" a b"; StringUtils.trimTrailingWhitespace(" a b  c ")=" a b  c"; StringUtils.trimAllWhitespace("")=""; StringUtils.trimAllWhitespace(" ")=""; StringUtils.trimAllWhitespace("\t")=""; StringUtils.trimAllWhitespace(" a")="a"; StringUtils.trimAllWhitespace("a ")="a"; StringUtils.trimAllWhitespace(" a ")="a"; StringUtils.trimAllWhitespace(" a b ")="ab"; StringUtils.trimAllWhitespace(" a b  c "="abc"; //统计一个子字符串在字符串出现的次数  StringUtils.countOccurrencesOf(null, null) == 0; StringUtils.countOccurrencesOf("s", null) == 0; StringUtils.countOccurrencesOf(null, "s") == 0; StringUtils.countOccurrencesOf("erowoiueoiur", "WERWER") == 0; StringUtils.countOccurrencesOf("erowoiueoiur", "x")=0; StringUtils.countOccurrencesOf("erowoiueoiur", " ") == 0; StringUtils.countOccurrencesOf("erowoiueoiur", "") == 0; StringUtils.countOccurrencesOf("erowoiueoiur", "e") == 2; StringUtils.countOccurrencesOf("erowoiueoiur", "oi") == 2; StringUtils.countOccurrencesOf("erowoiueoiur", "oiu") == 2; StringUtils.countOccurrencesOf("erowoiueoiur", "oiur") == 1; StringUtils.countOccurrencesOf("erowoiueoiur", "r") == 2; //字符串替换 String inString = "a6AazAaa77abaa"; String oldPattern = "aa"; String newPattern = "foo"; // Simple replace String s = StringUtils.replace(inString, oldPattern, newPattern); s.equals("a6AazAfoo77abfoo")=true; // Non match: no change s = StringUtils.replace(inString, "qwoeiruqopwieurpoqwieur", newPattern); s.equals(inString)=true s = StringUtils.replace(inString, oldPattern, null); s.equals(inString)=true // Null old pattern: should ignore s = StringUtils.replace(inString, null, newPattern);        s.equals(inString)=true //删除字符串 String inString = "The quick brown fox jumped over the lazy dog"; String noThe = StringUtils.delete(inString, "the"); noThe.equals("The quick brown fox jumped over  lazy dog")=true; String nohe = StringUtils.delete(inString, "he"); nohe.equals("T quick brown fox jumped over t lazy dog")=true; String nosp = StringUtils.delete(inString, " "); nosp.equals("Thequickbrownfoxjumpedoverthelazydog")=true; String killEnd = StringUtils.delete(inString, "dog"); killEnd.equals("The quick brown fox jumped over the lazy ")=true; String mismatch = StringUtils.delete(inString, "dxxcxcxog");  mismatch.equals(inString)=true; //删除任何字符 //源代码如下 //char c = inString.charAt(i); //如果不存在 c 值，则返回 -1 //if (charsToDelete.indexOf(c) == -1) { //out.append(c); //} String inString = "Able was I ere I saw Elba"; String res = StringUtils.deleteAny(inString, "I");        res.equals("Able was  ere  saw Elba")=true; res = StringUtils.deleteAny(inString, "AeEba!"); res.equals("l ws I r I sw l")=true; String mismatch = StringUtils.deleteAny(inString, "#@$#$^"); mismatch.equals(inString)=true; //源代码如下 return (str != null ? "'" + str + "'" : null); assertEquals("'myString'", StringUtils.quote("myString")); assertEquals("''", StringUtils.quote("")); assertNull(StringUtils.quote(null)); //将第一个字符改大写 StringUtils.capitalize(Str) //将第一个个字符改小写 StringUtils.uncapitalize(str) //mypath/myfile.txt" -> "myfile.txt //获取字符串文件名和扩展名 StringUtils.getFilename("myfile").equals("myfile")=true; StringUtils.getFilename("mypath/myfile".equals("myfile")=true; StringUtils.getFilename("mypath/myfile".equals("myfile")=true; StringUtils.getFilename("myfile.txt").equals("myfile.txt")=true; StringUtils.getFilename("mypath/myfile.txt").equals("myfile.txt")=true; //获取字符串扩展名,以.分隔 StringUtils.getFilenameExtension("myfile")=null; StringUtils.getFilenameExtension("myPath/myfile")=null; StringUtils.getFilenameExtension("myfile.").equals("")=true; StringUtils.getFilenameExtension("myPath/myfile.").equals("")=true; StringUtils.StringUtils.getFilenameExtension("myfile.txt").equals("txt")=true; StringUtils.getFilenameExtension("mypath/myfile.txt").equals("txt")=true; //舍去文件名扩展名 StringUtils.stripFilenameExtension(null)=true; StringUtils.stripFilenameExtension("").equals("")=true; StringUtils.stripFilenameExtension("myfile").equals("myfile")=true; StringUtils.stripFilenameExtension("mypath/myfile").equals("mypath/myfile")=true; StringUtils.stripFilenameExtension("myfile.").equals("myfile")=true; StringUtils.stripFilenameExtension("mypath/myfile.").equals("mypath/myfile")=true; StringUtils.stripFilenameExtension("mypath/myfile.").equals("mypath/myfile")=true; StringUtils.stripFilenameExtension("myfile.txt").equals("myfile")=true; StringUtils.stripFilenameExtension("mypath/myfile.txt").equals("mypath/myfile")=true;