java文件读写--工具方法-蒲公英云

java文件读写--工具方法

蔚落 2023-01-10 14:56 257阅读 0赞

package util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.springframework.util.StringUtils;
public class FileUtil {
    /**
     * @Title: writeFileByLines
     * @Description: 按行写文件
     * @param fileName 
     * @param strs
     * @param append  是否追加
     * @throws IOException
     * @date: 2021-01-25 12:32
     */
    public static void writeFileByLines(String fileName, String[] strs, boolean append) throws IOException {
        FileWriter fw = new FileWriter(fileName, append);
        for (String str : strs) {
            fw.write(str);
            fw.write("\n");//换行
        }
        fw.flush();
        fw.close();
    }
    /**
     * @Title: readFile
     * @Description: 读取文件内容
     * @param filePathAndName  绝对路径
     * @param encoding   编码格式
     * @return String
     * @date: 2021-01-25 12:39 
     */
    public static String readFile(String filePathAndName,String encoding) {
        String fileContent = "";
        try {
            if (StringUtils.isEmpty(encoding)) {
                encoding = "UTF-8";
            }
            File f = new File(filePathAndName);
            if (f.isFile() && f.exists()) {
                InputStreamReader read = new InputStreamReader(new FileInputStream(f), encoding);
                BufferedReader reader = new BufferedReader(read);
                String line;
                while ((line = reader.readLine()) != null) {
                    fileContent += line;
                }
                read.close();
            }
        } catch (Exception e) {
            System.out.println("读取文件内容操作出错");
            e.printStackTrace();
        }
        return fileContent;
    }
    /**
     * @Title: readTxtFileToListString
     * @Description: 读取txt文本文件
     * @param filePath
     * @param encoding   编码格式
     * @return List<String>
     * @date: 2021-01-25 12:32
     */
    public static List<String> readTxtFileToListString(String filePath, String encoding) {
        List<String> listContent = new ArrayList<>();
        try {
            if (StringUtils.isEmpty(encoding)) {
                encoding = "UTF-8";
            }
            File file = new File(filePath);
            if (file.isFile() && file.exists()) { // 判断文件是否存在
                InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding);// 考虑到编码格式
                BufferedReader bufferedReader = new BufferedReader(read);
                String lineTxt = null;
                while ((lineTxt = bufferedReader.readLine()) != null) {
                    // System.out.println(lineTxt);
                    listContent.add(lineTxt);
                }
                read.close();
            } else {
                System.out.println("找不到指定的文件");
            }
        } catch (Exception e) {
            System.out.println("读取文件内容出错");
            e.printStackTrace();
        }
        return listContent;
    }
}