I/O输入输出流的练习

public class Test01 {

    public static void main(String[] args) {
        //输出流
        String filename="f:/test/TextRw.txt";
        //追加方式
        try 
        {     //追加输入（字节流输入）
                FileOutputStream out = new FileOutputStream(filename,true);
                String str="20142200101 毕研椿";
                //写入数据
                out.write(str.getBytes());
                //释放资源
                out.close();
                System.out.println("写入成功");
                //输入流
                FileInputStream in =new FileInputStream(filename);
                //容器byte[]
                byte[] b =new byte[1024];
                //长度
                int i =0;
                //内容
                StringBuilder chu =new StringBuilder();
                //循环读取
                while((i=in.read(b))>0)
                {
                    //组装数据
                    chu.append(str);
                }
                System.out.println("文件写入内容"+str);
                
                
                //字符流输入
                //输出流
                FileWriter fw = new FileWriter("f:/test/TextRw.txt",true);
                fw.write("20142200101毕研椿");
                fw.close();
                System.out.println("写入成功");
                //输入流
                FileReader fr = new FileReader("f:/test/TextRw.txt");
                char[]c =new char[1024];
                int j=0;
                StringBuilder shur = new StringBuilder();
                while((j=fr.read(c))>0)
                {   //终止读取完单个数组

的长度
                    shur.append(new String(c,0,j));
                }
                System.out.println("读取："+shur);
                fr.close();
        } 
        catch (Exception e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        
    
    }

}

public class Test02 {

    public static void main(String[] args) {
            File file = new File("f:/text.txt");
        
        //输出流写入一个文件
        try {
                FileOutputStream out = new FileOutputStream("f:/text.txt");
                //写入内容
                String nr = "太难了";
               //兼容任何类型数据
                byte[] b =nr.getBytes();
                out.write(b);
                out.close();
                System.out.println("输出流写入成功");
                //输入流   读  
                FileInputStream in  = new FileInputStream("f:/text.txt");
                // 容器
                byte[] b1 = new byte[1024];
                int i =-1;
                StringBuilder  str = new StringBuilder();
                while(( i =in.read(b1))>0)
                {
                    //组装数据
                    str.append(new String(b1,0,i));
                 }
                System.out.println("读出的信息是："+str);
                in.close();
                //本质：把原有文件以新的文件名和路径进行复制，然后删除源文件
                file.renameTo(new File("f:/iodemo.txt"));
                System.out.println("修改成功"+file);
                  
             } 
        
        catch (Exception e) {
            
            e.printStackTrace();
        }
    }

}

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

public class Test03 {

    public static void main(String[] args) {
        //文件复制
        //边读边写
        
        
        try {
                //输入流 读
                FileInputStream in = new FileInputStream("f:/个人简历.docx");
                //byte[]容器
                byte[] b = new byte[1024];
                //长度
                int i =-1;
                //写  输出流
                FileOutputStream out = new FileOutputStream("f:/学号姓名.docx");
                //边读边写
                while((i=in.read(b))>0)
                {
                    //写
                    out.write(b,0,i);
                }
                out.close();
                in.close();
                System.out.println("复制成功");
              } 
        catch (Exception e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }

    }

}