IO输入输出

package com.hanqi.test;

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class TextRw {

    public static void main(String[] args) {
        
        try {
            FileWriter fw =new FileWriter("d:/TextRw.txt");
            fw.write("姓名：张三\r\n学号：10001");
            fw.close();
            System.out.println("写入成功：\r\n");
            FileReader fr = new FileReader("d:/TextRw.txt");
            char [] b =new char[1024];
            int i =-1;
            StringBuilder str = new StringBuilder();
            while((i=fr.read(b))>0)
            {
                str.append(new String(b,0,i));
            }
            fr.close();
            System.out.println("读取:\r\n"+str);
            
        } catch (IOException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        

    }

}