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[Jakarta Commons] 使用StringUtil類

org.apache.commons.lang.StringUtils中提供許多有用的字符串操作方法，了解這些方法，我們可以避免許多不必要的重復工作。下面介紹其中比較有用的幾個方法：

檢查空字符串：

StringUtils.isBlank(String?str);

StringUtils.isNotBlank(String?str);

縮寫字符串：

String?test? = ? " This?is?a?test?of?the?abbreviation. "

System.out.println(?StringUtils.abbreviate(?test,? 10 ?)?);

[Console輸出]

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輸出]

Title:?Test?Page

驗證字符串：

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

計算字符串出現頻率：

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 " ?);

比較不同字符串：

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輸出]

Edit?Distance:? 2

Difference:?ld

Diff?Index:? 3

posted on 2006-07-27 16:01 zJun's帛羅閣閱讀(6314) 評論(2) 編輯收藏所屬分類: 開發環境


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# re: [Jakarta Commons] 使用StringUtil類 2006-07-28 19:19 方佳瑋

# re: [Jakarta Commons] 使用StringUtil類 2006-08-03 15:21 J_G

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[Jakarta Commons] 使用StringUtil類

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