在Java中从文本文件检索某些字符串

是否有可能在文本文件的行中找到特定字符串并将其存储在变量中

例如：

2007-11-11 @South Alabama            72  Sam Houston St           54           
2007-11-11 Auburn                    91  Detroit                  47           
2007-11-11 @Missouri KC              65  Air Force                59           
2007-11-11  Ga Southern              67 @Stetson                  51   

对于此文本文件，我希望存储其中包含

@

符号的字符串，以便稍后可以使用String.contains在程序中运行测试

换句话说，有没有办法获取第二个或第四个或第五个字符串，并检查它们是否有

@

符号

我想做一些类似的事情：

if(secondToken.contains("@") && int1 > int2){
stuff...
}else if(fourthToken.contains("@") || fifthToken.contains("@") && int1 < int2){
other stuff...
}

if（secondToken.contains（“@”）&&int1>int2）{
东西
}else if（第四个令牌包含（“@”）|第五个令牌包含（“@”）和&int1

我已经存储了行中的所有int值。

您可以使用带有以下正则表达式的and类：

^\d{4}-\d{2}-\d{2}\s+（[^\d]+）（[\d]+）\s+（[^\d]+）（[\d]+）\s*$

这个正则表达式为每个团队名称和分数都有匹配的组-反斜杠需要在字符串中转义。然后可以循环所有匹配项，并检查匹配组值的起始字符串“@”

给定行：

正则表达式模式将匹配如下：

• \d{4}-\d{2}-\d{2}\s+

  =

  “2007-11-11”

• （[^\d]+）

  =

  “@South Alabama”

  -第一个匹配组，修剪匹配

• （[\d]+）

  =“72”-第二个匹配组

• \s+

  =

  “”

• （[^\d]+）

  =

  “山姆休斯顿街”

  -第三组，修剪比赛

• （[\d]+）

  =“54”-第四个匹配组

• \s*

  =

  “”

示例代码：

示例输出：

---

你只想在“像南阿拉巴马州”之后找词。然后读取每一行并通过regex获取值，甚至不是整个名称，我只需要@上附加的内容。我怎么取单词？你是说整行？你的问题不清楚。文本文件的格式如何请参见编辑。我只是想在每一行上用@来检查这个词。@Hector-但它比这更复杂，不是吗？您是只想要“

South

”，还是想要“

South Alabama

”？您打算将此数据格式设置为固定宽度列，还是使用某种类型的分隔符？

2007-11-11 @South Alabama            72  Sam Houston St           54           

public static void main(String[] args) {
    // Input string with \n newlines
    String input = "2007-11-11 @South Alabama            72  Sam Houston St           54           \n2007-11-11 Auburn                    91  Detroit                  47          \n2007-11-11 @Missouri KC              65  Air Force                59           \n2007-11-11  Ga Southern              67 @Stetson                  51   ";
    // The regex with four matching groups, backslashes escaped
    String regex = "^\\d{4}-\\d{2}-\\d{2}\\s+([^\\d]+)[\\d]+\\s+([^\\d]+)[\\d]+\\s*$";
    // Pattern with multiline and insensitive options
    Pattern p = Pattern.compile(regex, Pattern.MULTILINE | Pattern.CASE_INSENSITIVE );
    // Match each line in the input
    Matcher m = p.matcher(input);
    // Loop over the matches
    while (m.find()){
        // first team name
        String first = m.group(1).trim();
        // first team score
        Integer firstScore = new Integer(m.group(2).trim());
        // second team name
        String second = m.group(3).trim();
        // second team score
        Integer secondScore = new Integer(m.group(4).trim());

        // is the first team the home team?
        if ( first.startsWith("@") ){
            // did they win?
            if (firstScore > secondScore){
                System.out.println("The home team " + first + " won " + firstScore + " to " + secondScore + " over " + second);
            } else {
                System.out.println("The home team " + first + " lost to " + second + " " + firstScore + " to " + secondScore);
            }
        } else 
        // is the second team the home team?
        if ( second.startsWith("@") ){
            // did they win?
            if (secondScore > firstScore){
                System.out.println("The home team " + second + " won " + secondScore + " to " + firstScore + " over " + first);
            } else {
                System.out.println("The home team " + second + " lost to " + first + " " + secondScore + " to " + firstScore);
            }
        } else {
            System.out.println("Both teams - " + first + " and " + second + " - were away.");
        }
    }
}

The home team @South Alabama won 72 to 54 over Sam Houston St
Both teams - Auburn and Detroit - were away.
The home team @Missouri KC won 65 to 59 over Air Force
The home team @Stetson lost to Ga Southern 51 to 67