BufferedReader中readLine()方法的使用
package com.cvicse.io.demo; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /** * 缓冲流 * 字节缓冲区流 BufferedInputStream BufferedOutputStream * 字符缓冲区流 BufferedReader BufferedWriter * @author 13169 * */ public class BufferedReaderDemo01 { public static void main(String[] args) throws IOException { //数据输入的标准格式 //System.in是InputStream类对象 //BufferedReader类中需要接受Reader类对象 //使用转换流将System.in转换为Reader类对象 BufferedReader buf = new BufferedReader(new InputStreamReader(System.in)); System.out.println("请输入数据："); //读取一行数据 String str = buf.readLine(); System.out.println(str); buf.close(); } }实现标准键盘输入
package com.cvicse.io.demo; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /** * 缓冲流 * 字节缓冲区流 BufferedInputStream BufferedOutputStream * 字符缓冲区流 BufferedReader BufferedWriter * @author 13169 * */ public class BufferedReaderDemo02 { public static void main(String[] args) throws IOException { BufferedReader buf = new BufferedReader(new InputStreamReader(System.in)); boolean flag = true; System.out.println("请输入年龄："); while (flag) { //读取一行数据 String str = buf.readLine(); if(str.matches("\\d{1,3}")) { //如果输入数据由数字组成 System.out.println("年龄是："+Integer.parseInt(str)); flag = false; //退出循环 }else { System.out.println("年龄输入错误，应该由数字组成"); System.out.println("请重新输入年龄："); } } buf.close(); } }利用缓冲流进行大文本读取
package com.cvicse.io.demo; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; /** * 缓冲流 * 字节缓冲区流 BufferedInputStream BufferedOutputStream * 字符缓冲区流 BufferedReader BufferedWriter * @author 13169 * */ public class BufferedReaderDemo03 { public static void main(String[] args) throws IOException { File file = new File("E:"+File.separator+"apache-maven-3.6.0"+File.separator+"README.txt"); //利用缓冲区流进行文件读取 大文本数据读取 BufferedReader buf = new BufferedReader(new FileReader(file)); String str = null; while((str = buf.readLine())!= null) { System.out.println(str); } buf.close(); } }