读取txt文件，生成csv文件

最近做了个小程序，要求在同文件夹下的txt文件，处理内容之后，生成csv文件。

import java.io.*;
import java.util.ArrayList;
import java.util.List;

public class Simplify {

    public static void main(String[] args) {

        List<String> resultList = readTxt();

        outCsv(resultList);

        System.out.println(System.getProperty("user.dir"));
    }

    /* 处理文件内容 */
    private static List<String> readTxt() {

//        String fileName = Simplify.class.getClassLoader().getResource("").getPath() + "\jacoco.txt";
        String fileName = System.getProperty("user.dir") + "\jacoco.txt";
        File file = new File(fileName);
        BufferedReader reader = null;
        List<String> resultList = new ArrayList<>();
        String[] tempStrs;
        String[] packageClassStrs;
        String packageClass = "";

        try {
            reader = new BufferedReader(new FileReader(file));
            String tempString;
            // 一次读入一行，直到读入null为文件结束
            while ((tempString = reader.readLine()) != null) {
                if (tempString.contains(" class ")) {
                    tempString = tempString.substring(tempString.indexOf("class")).replaceAll("/", ".");
                    tempStrs = tempString.split(" ");
                    packageClass = tempStrs[2];
                } else if (tempString.contains(" method ") && !tempString.contains("<init>()V")) {
                    tempString = tempString.substring(tempString.indexOf("method")).replaceAll("/", ".");
                    tempStrs = tempString.split(" ");
                    packageClassStrs = packageClass.split("\.");
                    String cla = packageClassStrs[packageClassStrs.length - 1];
                    String pac = packageClass.substring(0, packageClass.length() - cla.length() - 1);
                    resultList.add(pac + "," + cla + "," + tempStrs[1].substring(0, tempStrs[1].indexOf("(")));
                }
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
        return resultList;
    }

    /* 输出csv文件 */
    private static void outCsv(List<String> resultList) {

        FileOutputStream out = null;
        OutputStreamWriter osw = null;
        BufferedWriter bfw = null;

        String fileName = System.getProperty("user.dir") + "\jacoco.csv";
//        String fileName = Simplify.class.getClassLoader().getResource("").getPath() + "\jacoco.csv";
        try {
            out = new FileOutputStream(fileName);
            osw = new OutputStreamWriter(out, "UTF8");
            bfw = new BufferedWriter(osw, 1024);

            if (resultList != null && !resultList.isEmpty()) {
                for (String result : resultList) {
                    bfw.write(result + "
");
                }
            }
            bfw.flush();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (osw != null) {
                    osw.close();
                }
                if (bfw != null) {
                    bfw.close();
                }
            } catch (IOException e1) {
                e1.printStackTrace();
            }
        }
    }
}

System.getProperty("user.dir")相对路径的取法