在字符串中插入逗号

package changeString;import java.io.FileNotFoundException;import java.io.PrintWriter;import java.util.ArrayList;import java.util.List;public class changeString {static final String konma = ",";public static void main(String[] args) throws Exception {// TODO Auto-generated method stubString outStirng = null;Listinput = new ArrayList();

CsvUtil startFile = new CsvUtil("D:\\start.csv");

CsvUtil endFile = new CsvUtil("D:\\end.csv");

readFile rFile = new readFile();

input = rFile.readCsv("D:\\testfile.txt");

String str = null;

int start = 0;

int end = 0;

//System.out.println(startFile.getList().get(0));

//System.out.println(input.get(0));

//System.out.println(input.get(0).substring(3381, 3391));

for (int i = 0; i < input.size(); i++) {

for (int j = 0; j < startFile.getColNum(); j++) {

start = Integer.parseInt(startFile.getCol(j));

end = Integer.parseInt(endFile.getCol(j));

str = input.get(i).substring(start, end);

str = str + ",";

outStirng = outStirng + str;

}

outFile(outStirng);

}

}

public static void outFile(String string) throws Exception {

PrintWriter pWriter = new PrintWriter("D:\\outfile.txt");

pWriter.println(string);

pWriter.close();

}

}

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package changeString;import java.io.BufferedReader;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;import java.util.ArrayList;import java.util.List;public class readFile {public ListreadCsv(String path) throws IOException { String data = null;Listlist = new ArrayList<>();

String file = path;

try(BufferedReader br = new BufferedReader(new FileReader(file))) {

while ((data=br.readLine()) != null) {

list.add(data);

}

} catch (FileNotFoundException e) {

//Some error logging

}

return list;

}

}