Escritura de herramientas de lectura de texto y generación de archivos csv

1. Leer el texto

 /**
     * 读取log或者txt信息
     *
     * @param filePath
     * @return
     */
    private static List<String> readLog(String filePath) {
    
    
        List<String> list = new ArrayList<String>();

        try {
    
    
            FileInputStream is = new FileInputStream(filePath);
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            String line;
            try {
    
    
                while ((line = br.readLine()) != null) {
    
    
                    if (line.equals(""))
                        continue;
                    else
                        list.add(line);
                }
            } catch (IOException e) {
    
    
                e.printStackTrace();
                System.out.println("读取一行数据时出错");
            }
        } catch (FileNotFoundException e) {
    
    
            e.printStackTrace();
            System.out.println("文件读取路径错误FileNotFoundException");
        }
        return list;
    }

2. La generación de archivo csv

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;

/**
 * @author lizhangyu
 * @version 1.0
 * @description
 * @date 2020/8/19 19:41
 */
public class CSVUtil {
    
    

    /**
     * CSV文件生成方法
     * @param head
     * @param dataList
     * @param outPutPath
     * @param filename
     * @return
     */
    public static File createCSVFile(List<Object> head, List<List<Object>> dataList,
                                     String outPutPath, String filename) {
    
    
        File csvFile = null;
        BufferedWriter csvWtriter = null;
        try {
    
    
            csvFile = new File(outPutPath + File.separator + filename + ".csv");
            System.out.println(File.separator);
            File parent = csvFile.getParentFile();
            if (parent != null && !parent.exists()) {
    
    
                parent.mkdirs();
            }
            csvFile.createNewFile();
            csvWtriter =  new BufferedWriter(new OutputStreamWriter(new FileOutputStream( csvFile)));
            // 写入文件头部
            writeRow(head, csvWtriter);
            // 写入文件内容
            for (List<Object> row : dataList) {
    
    
                writeRow(row, csvWtriter);
            }
            csvWtriter.flush();
        } catch (Exception e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            try {
    
    
                csvWtriter.close();
            } catch (IOException e) {
    
    
                e.printStackTrace();
            }
        }
        return csvFile;
    }

    /**
     * 写一行数据方法
     * @param row
     * @param csvWriter
     * @throws IOException
     */
    private static void writeRow(List<Object> row, BufferedWriter csvWriter) throws IOException {
    
    
        // 写入文件头部
        for (Object data : row) {
    
    
            StringBuffer sb = new StringBuffer();
            String rowStr = sb.append("\"").append(data).append("\",").toString();
            csvWriter.write(rowStr);
        }
        csvWriter.newLine();
    }


    public static void main(String[] args) {
    
    
        List<Object> exportData = new ArrayList<Object>();
        exportData.add("第一列");
        exportData.add("第二列");
        exportData.add("第三列");
        List<List<Object>> datalist = new ArrayList<List<Object>>();
        List<Object> data=new ArrayList<Object>();
        data.add("111");
        data.add("222");
        data.add("333");
        List<Object> data1=new ArrayList<Object>();
        data1.add("444");
        data1.add("555");
        data1.add("666");
        datalist.add(data);
        datalist.add(data1);
        String path = "d:/export/";
        String fileName = "文件导出";

        File file = CSVUtil.createCSVFile(exportData, datalist, path, fileName);
        String fileName2 = file.getName();
        System.out.println("文件名称：" + fileName2);
    }
}