package cn.bdqn.demo;
import java.io.File;
import java.io.FileInputStream;
import java.io.PrintWriter;
import java.util.Scanner;
public class Text {
public static void main(String[] args) {
/*
* 新建文件并写入数据
*/
File file = new File("E:\Text.txt");// 文件对象
if (file.exists()) {// 判断该路径下该文件是否存在
System.out.print("文件已经存在!");
System.exit(0);// 终止虚拟机
}
PrintWriter out = null;// 初始化PrintWriter
try {
out = new PrintWriter(file);// new出PrintWriter对象
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
/*
* 向文件内写入数据
*/
out.println("John,Where are you?");
out.println("I'am here!");
out.println("How old are you?");
out.println(15);
// 关闭写入器
out.close();
}
}
package cn.bdqn.demo;
import java.io.File;
import java.io.FileInputStream;
import java.io.PrintWriter;
import java.util.Scanner;
public class Text {
public static void main(String[] args) {
/*
* 读取指定文件的数据并输出
*/
FileInputStream stream = null;// 初始化FileInputStream
try {
stream = new FileInputStream("E:\Text.txt");// new出FileInputStream对象,并将路径赋值
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Scanner in = new Scanner(stream);// 读取文件 内数据
while (in.hasNextLine()) {
System.out.println(in.nextLine());// 写出
}
in.close();// 关闭写出器
}
}