java文件读写--工具方法

蔚落 2023-01-10 14:56 158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;
    	}
    }