Question

我有以下txt文件的内容：

 Some text I would like not to inclcude

#id: col1, name, money\

  2017-01-02, Michael,  200 \
  2017-01-01, Tobias,   300 \
  2017-02-03, Susan,    400 \
  2017-05-04, John,     200 \
     ...     ...    ...
 Some text I would like not to inclcude

我想创建一个Treemap并将col1作为我的密钥：

    import java.io.*;
    import java.util.*;


    class earnings
    {
        public static void main(String[] args) throws FileNotFoundException {

            Scanner scanner = new Scanner(new FileReader("example.txt"));

            TreeMap<String, String> map = new TreeMap<String, String>();

            while (scanner.hasNextLine()) {
                String[] columns = scanner.nextLine().split("\t");
                map.put(columns[0],columns[0]);
            }

            System.out.println(map);
        }
    }

使用Some text I would like not to inclcude输出：

    {=,  2017-01-01,  Tobias,   300 \= 2017-01-01,  Tobias,   300 \,  
 2017-01-02, Michael,  200 \= 2017-01-02, Michael,  200 \,  2017-02-03,  
 Susan,    400 \= 2017-02-03,  Susan,    400 \,  2017-05-04,  John,     
 200 \= 2017-05-04,  John,     200 \,  Some text I would like not to 
 inclcude= Some text I would like not to inclcude, Some text I would 
 like not to inclcude=Some text I would like not to inclcude}

没有Some text I would like not to inclcude的输出仍有一些重复：

    {=,  2017-01-01,  Tobias,   300 \= 2017-01-01,  Tobias,   300 \,  
   2017-01-02, Michael,  200 \= 2017-01-02, Michael,  200 \,  2017-02-
  03,  Susan,    400 \= 2017-02-03,  Susan,    400 \,  2017-05-04,  
  John,     200 \= 2017-05-04,  John,     200 \}

如何设置创建一个Some text I would like not to inclcude并看起来像

的树形图

{ 2017-01-01, Tobias,  300 \ 2017-01-02, Michael, 200 \ 2017-02-03, Susan, 400 \  2017-05-04,  John,     200 \}

或者至少没有重复

Answer 1

您将不需要的数据放入集合的原因是您的文件输入很复杂，并且您需要处理规则来确定文件的哪些部分有效。你已经声明你有一个开始触发器和一个停止触发器。

处理的状态是：

未就绪
就绪（到达开始触发后） - 在此状态下读入您的地图
完成（在达到停止触发后）

目前尚不清楚地图中的值是什么（关键是日期）。现在，我已经连接了名称和金钱值：如果这不正确，请修复此问题。请注意，您需要使用＆＃34;，＆＃34 ;;

此代码管理这些状态，并确保进入Map的任何数据都是有效数据（在启动和停止触发器之间）

public class Earnings {

final static String START_TRIGGER = " Some text I would like not to inclcude";
final static String STOP_TRIGGER = " Some text I would like not to inclcude";

enum ProcessingState {
    NOT_READY,
    READY,
    FINISHED;
}

public static void main(String[] args) throws FileNotFoundException {

    Scanner scanner = new Scanner(new FileReader("Example.txt"));

    TreeMap<String, String> map = new TreeMap<String, String>();

    ProcessingState processingState = ProcessingState.NOT_READY;

    while (scanner.hasNextLine() && processingState != ProcessingState.FINISHED) {

        String lineToProcess = scanner.nextLine();

        if (processingState == ProcessingState.READY && lineToProcess.startsWith(STOP_TRIGGER))
            processingState = ProcessingState.FINISHED;

        if (processingState == ProcessingState.READY) {
            String[] columns = lineToProcess.split(",");
            map.put(columns[0],columns[1]+", "+columns[2]);
        }

        if (processingState == ProcessingState.NOT_READY && lineToProcess.startsWith(START_TRIGGER))
            processingState = ProcessingState.READY;


    }

    System.out.println(map);
}

}

我测试了你的数据，这产生了：

{  2017-01-01= Tobias,    300 \,   2017-01-02= Michael,   200 \,   2017-02-03= Susan,     400 \,   2017-05-04= John,      200 \}

Answer 2

String s = "2017-01-01, Tobias,   300 ";
String[] split = s.split(",");
if (split[0].trim().matches("\\d{4}-\\d{2}-\\d{2}")) {
    System.out.println(split[0].trim());
}

在您的方法中，您可以执行以下操作：

while (scanner.hasNextLine()) {
String[] columns = scanner.nextLine().split(",");
    if(columns[0].trim().matches("\\d{4}-\\d{2}-\\d{2}")        
    map.put(columns[0],columns[0]);
}

如何从文本文件

2 个答案: