用于提取由分号分隔的元素的定界符

delimiter to extract elements separated by semicolon

我的原始数据格式示例:

196 242X 3  
186 B302 3  
22  BO377 1

为了提取数据,我沿分隔符 (\t) 拆分:

 EventDAO dao = new SimpleFileRatingDAO(inputFile, "\t");

但是,我的数据格式发生了变化,变成了这样:

"196";"242X";"3"    
"186";"B302";"3"    
"22";"BO377";"1"

是否有我可以用来提取数据的正则表达式,与我以前的方法类似?

您的新 reg Exp 应该与两个分隔符匹配(如果它们没有出现在数据中)

"[\t|;]"

SimpleFileRatingDAO 似乎允许正则表达式: 它使用调用 String.split(str) :

的对象 class
enter code hereEventDAO dao = new SimpleFileRatingDAO(inputFile, "[\t|;]");

导致:

myLine.split("[\t|;]")

如果您的数据可能包含这些分隔符,但仅在引号之间:只有当逗号前面有零或偶数个引号时,您才需要在逗号上拆分:

"[\t|;](?=([^\"]*\"[^\"]*\")*[^\"]*$)"

Thanks to Bart Kiers who inspire me.

尝试使用简单的字符串操作,如拆分和替换:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;


public class Example {

    class DataBean{

        private String info1;
        private String info2;
        private String info3;

        public DataBean(String info1, String info2, String info3){
            this.info1 = info1;
            this.info2 = info2;
            this.info3 = info3;
        }

        public String getInfo1() {return info1;}
        public void setInfo1(String info1) {this.info1 = info1;}
        public String getInfo2() {return info2;}
        public void setInfo2(String info2) {this.info2 = info2;}
        public String getInfo3() {return info3; }
        public void setInfo3(String info3) {this.info3 = info3;}

    }

    /**
     * @param args
     * @throws IOException 
     * 
     * TODO: do better exc-handling
     */
    public static void main(String[] args) throws IOException {

        /*
         * data.txt:
         * 
         *  "196";"242X";"3"    
         *  "186";"B302";"3"    
         *  "22";"BO377";"1"
         */

        File dataFile = new File("data.txt");       
        FileInputStream fis = new FileInputStream(dataFile);
        InputStreamReader isr = new InputStreamReader(fis);
        BufferedReader br = new BufferedReader(isr);

        String strLine;
        List<DataBean> data = new ArrayList<DataBean>();

        while ((strLine = br.readLine()) != null)   {
          String[] rawData = strLine.replace("\"", "").split(";");
          DataBean dataBean = new Example().new DataBean(rawData[0], rawData[1], rawData[2]);
          data.add(dataBean);
        }

        for (DataBean dataBean : data) {
            System.out.println(dataBean.getInfo1() + "-" + dataBean.getInfo2() + "-" + dataBean.getInfo3());
        }
        br.close();

    }