[发掘Jakarta Commons] 使用StringUtil类

org.apache.commons.lang.StringUtils中提供许多有用的字符串操作方法，了解这些方法，我们可以避免许多不必要的重复工作。下面介绍其中比较有用的几个方法：

检查空字符串：

StringUtils.isBlank(String str);
StringUtils.isNotBlank(String str);

缩写字符串：

String test = " This is a test of the abbreviation. "
System.out.println( StringUtils.abbreviate( test, 10 ) );

[Console输出]
This is

查找嵌套字符串：

String htmlContent = " <html>\n " +
                      "   <head>\n " +
                      "     <title>Test Page</title>\n " +
                      "   </head>\n " +
                      "   <body>\n " +
                      "     <p>This is a TEST!</p>\n " +
                      "   </body>\n " +
                      " </html> " ;

// Extract the title from this XHTML content
String title = StringUtils.substringBetween(htmlContent, " <title> " , " </title> " );
System.out.println( " Title: " + title );

[Console输出]
Title: Test Page

验证字符串：

String test1 = " ORANGE " ;

String test2 = " ICE9 " ;

String test3 = " ICE CREAM " ;

String test4 = " 820B Judson Avenue " ;

boolean t1val = StringUtils.isAlpha( test1 ); // returns true

boolean t2val = StringUtils.isAlphanumeric( test2 ); // returns true

boolean t3val = StringUtils.isAlphaSpace( test3 ); // returns true

boolean t4val =

StringUtils.isAlphanumericSpace( test4 ); // returns true

计算字符串出现频率：StringUtils.countMatches()

File manuscriptFile = new File( " manuscript.txt " );

Reader reader = new FileReader( manuscriptFile );

StringWriter stringWriter = new StringWriter( );

while ( reader.ready( ) ) { writer.write( reader.read( ) ); }

String manuscript = stringWriter.toString( );

// Convert string to lowercase

manuscript = StringUtils.lowerCase(manuscript);

// count the occurrences of "futility"

int numFutility = StringUtils.countMatches( manuscript, " futility " );

比较不同字符串：

int dist = StringUtils.getLevenshteinDistance( " Word " , " World " );

String diff = StringUtils.difference( " Word " , " World " );

int index = StringUtils.indexOfDifference( " Word " , " World " );

System.out.println( " Edit Distance: " + dist );

System.out.println( " Difference: " + diff );

System.out.println( " Diff Index: " + index );

[Console输出]
Edit Distance: 2

Difference: ld

Diff Index: 3

参考资料：
《Jakarta Commons Cookbook》
By Timothy M. O'Brien

Publisher : O'Reilly
Pub Date : November 2004
ISBN : 0 - 596 - 00706 -X
Pages : 400

[发掘Jakarta Commons] 使用StringUtil类

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