Java 读写文件操作
16lz
2021-04-14
文件内容
读文件
package wrtest;import java.io.*;public class ReadTest {public static void main(String[] args) {//创建文件对象File file = new File("read.txt");try {FileInputStream fileInputStream = new FileInputStream(file);InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);BufferedReader bufferedReader = new BufferedReader(inputStreamReader);try {String result = bufferedReader.readLine();//循环读取文件内容while (result != null) {System.out.println(result);result = bufferedReader.readLine();}bufferedReader.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}输出内容
写文件
覆盖原有内容
package wrtest;import java.io.*;public class WriteTest {public static void main(String[] args) {try {FileWriter file = new FileWriter("read.txt");BufferedWriter bufferedWriter = new BufferedWriter(file);//覆盖原有内容添加bufferedWriter.write("oooooooo");bufferedWriter.write("aaaaaaaaaaaa");bufferedWriter.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}添加结果
追加内容
package wrtest;import java.io.*;public class WriteTest {public static void main(String[] args) {try {//第二个参数为 true 时，表示向文件中追加内容FileWriter file = new FileWriter("read.txt",true);BufferedWriter bufferedWriter = new BufferedWriter(file);//向文件中追加内容bufferedWriter.write("\n");bufferedWriter.write("iiiiiiiiii");bufferedWriter.write("\n");bufferedWriter.write("pppppppppp");bufferedWriter.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}添加结果
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