IO流

来源：互联网发布：网络攻击防御体系编辑：程序博客网时间：2024/06/03 23:34

IO流*
output input
写输出读输入
字节流：outputStream（内存——文件）

package com.lenovo.file;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;public class LenovoDeom3 {    public static void main(String[] args) {        File file=new File("E:/java/12.txt");               try {            FileOutputStream out=new FileOutputStream(file);            out.close();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}

,inputStream（文件——内存）（直接进行操作）

package com.lenovo.file;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;public class LenovoDeom3 {    public static void main(String[] args) {        File file=new File("E:/java/12.txt");               try {            FileInputStream input=new FileInputStream(file);            int len=input.read();            while(len!=-1){            System.out.print((char)len);            len=input.read();            }        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}

字符流：Read

package com.lenovo.file;import java.io.File;import java.io.FileReader;import java.io.IOException;public class D {    public static void main(String[] args) {        // TODO Auto-generated method stub        File file=new File("e:/java/12.txt");        try {            FileReader w=new FileReader(file);            char[] c=new char[1024];            int len=w.read(c);            System.out.println(new String(c,0,len));        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}

Write（先缓存在操作）

package com.lenovo.file;import java.io.File;import java.io.FileWriter;import java.io.IOException;public class D {    public static void main(String[] args) {        // TODO Auto-generated method stub        File file=new File("e:/java/12.txt");        try {            FileWriter w=new FileWriter(file);            String s="java";            w.write(s);            w.close();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}

对内容按行读用字符流

阅读全文

0 0