Java实现读写文件功能的代码分享 Java实现读写文件功能的代码分

读文件
写文件
主函数
实现效果

下面是利用Java实现读写文件功能的示例代码

读文件 TextRead.java

import java.io.BufferedReader; import java.io.File; import java.io.FileReader; public class TextRead {/*** 读取txt文件的内容* @param file 想要读取的文件对象* @return 返回文件内容*/public static String txt2String(File file){StringBuilder result = new StringBuilder(); try{BufferedReader br = new BufferedReader(new FileReader(file)); //构造一个BufferedReader类来读取文件String s = null; while((s = br.readLine())!=null){//使用readLine方法，一次读一行result.append(System.lineSeparator()+s); }br.close(); }catch(Exception e){e.printStackTrace(); }System.out.println("TextRead" + result.toString()); return result.toString(); } public static void main(String[] args){File file = new File("D:\\fileCreate\\2022_08_17_10_08_501.txt"); System.out.println(txt2String(file)); }}

写文件 WriteFile.java

import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; public class WriteFile { public static void writeFileContent(String path, String MyStrs){ FileWriter fw=null; //文件路径String filePath = path; //日期格式SimpleDateFormat df = new SimpleDateFormat("yyyy_MM_dd_HH_MM_SS"); SimpleDateFormat dfTime = new SimpleDateFormat("yyyy-MM-dd:HH:MM:SS"); String fileName=df.format(new Date())+".txt"; File newFile=new File(filePath); if(!newFile.exists()) {newFile.mkdir(); }File f=new File(filePath,fileName); try {//创建文件f.createNewFile(); fw=new FileWriter(f); //写入数据String poem = MyStrs; //System.out.println("WriteFile" + poem); fw.write(dfTime.format(new Date())+ poem); } catch (IOException e) {throw new RuntimeException("文件创建失败"); }finally {try {fw.close(); } catch (IOException e) {throw new RuntimeException("文件流关闭失败"); }}} public static void main(String[] strings){ String filePath="D:\\fileCreate"; String strs = "西北有高楼，上与浮云齐；" +"烟笼寒水月笼沙，夜泊秦淮近酒家；" +"商女不知亡国恨，隔江犹唱后庭花。" +"Hello world" +"1234567890"; WriteFile.writeFileContent(filePath, strs); System.out.println("WriteFile" + strs); }}

主函数 【Java实现读写文件功能的代码分享】Main.java

import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; public class Main {public static void main(String[] args) { String filePath="D:\\fileCreate"; String strs = "西北有高楼，上与浮云齐；" +"烟笼寒水月笼沙，夜泊秦淮近酒家；" +"商女不知亡国恨，隔江犹唱后庭花。" +"Hello world" +"12345667890"; WriteFile.writeFileContent(filePath, strs); File file = new File("D:\\fileCreate\\2022_08_17_10_08_501.txt"); //String showFile = new String(); //showFile = TextRead.txt2String(file); //System.out.printf(showFile); //System.out.println(showFile); System.out.println("file = " + TextRead.txt2String(file)); System.out.println(TextRead.txt2String(file)); }}

实现效果