Java-11.25

最新推荐文章于 2025-03-26 14:00:45 发布

原创最新推荐文章于 2025-03-26 14:00:45 发布 · 218 阅读

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package org.lemon.FileInputStream;

import java.io.FileInputStream;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *文件的字节输入流 读数据方式---一次读取一个字节
 */
public class FileInputStreamDemo {
   public static void main(String[] args) throws IOException {
	//创建字节文件输入流对象
	   FileInputStream fis = new FileInputStream("abc.txt");
	// 读数据
	   int by = 0;
	   while((by=fis.read())!=-1) {
		   //System.out.print(by);//119111109710510110105
		   System.out.println((char)by);
	   }
	//释放资源
	   fis.close();
}
	
}

package org.lemon.FileInputStream;

import java.io.FileInputStream;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *文件的字节输入流 读数据方式---一次读取一个字节数组
 */
public class FileInputStreamDemo2 {
   public static void main(String[] args) throws IOException {
	FileInputStream fis = new FileInputStream("abc.txt");
	
	byte[] bys = new byte[1024];
	int len = 0;
	while((len=fis.read(bys))!=-1) {
		System.out.println(new String(bys,0,len));
	}
	fis.close();
}
}

package org.lemon.CopyFile;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *需求:在当前项目下abc.txt文件的内容赋值到edf.txt文件中  采用一次一个字节----慢慢慢
 */
public class CopyFileDemo {
  public static void main(String[] args) throws IOException {
  //创建文件字节输入对象
	FileInputStream fis = new FileInputStream("abc.txt");
  //创建输出流对象
	FileOutputStream fos = new FileOutputStream("edf.txt");
  //读写数据	
	int by =0;
	while((by=fis.read())!=-1) {
		fos.write(by);
	}
  //释放资源
	fis.close();
	fos.close();
}
}

package org.lemon.CopyFile;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *E盘下有一个高圆圆.jpg文件,将它图片内容复制到当前项目下的杨桃.jpg
 */
public class CopyFileDemo2 {

	public static void main(String[] args) throws IOException {

		// 封装数据源
		FileInputStream fis = new FileInputStream("e:\\高圆圆.jpg");
		// 封装目的地
		FileOutputStream fos = new FileOutputStream("杨桃.jpg");
		
		int by = 0;
		while ((by = fis.read()) != -1) {
			
			fos.write(by);
		}
		
		fis.close();
		fos.close();
	}
}

package org.lemon.CopyFile;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *E盘下有一个高圆圆.jpg文件,将它图片内容复制到当前项目下的杨桃.jpg     这次快 一次一个字节数组--美滋滋
 */
public class CopyFileDemo2a {
  public static void main(String[] args) throws IOException {
	FileInputStream fis = new FileInputStream("E:\\高圆圆.jpg");
	FileOutputStream fos = new FileOutputStream("杨桃.jpg");
	
	byte[] bys = new byte[1024];
	int len = 0;
	while((len= fis.read(bys))!=-1) {
		fos.write(bys,0,len);
	}
	fis.close();
	fos.close();
}
}

package org.lemon.CopyFile;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *使用字节输入流一次读取一个字节复制视频文件---->D:\\abc.mp4--->复制到当前项目:Copy.mp4
 */
public class CopyFileDemo3 {

	public static void main(String[] args) throws IOException {

		// 封装数据源
		FileInputStream fis = new FileInputStream("D:\\abc.mp4");

		// 封装目的地
		FileOutputStream fos = new FileOutputStream("Copy.mp4");

		int by = 0;
		while ((by = fis.read()) != -1) {
			fos.write(by);
		}

		fis.close();
		fos.close();
	}
}

package org.lemon.CopyFile;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *使用字节输入流复制视频文件---->E:\\abc.mp4--->复制到当前项目:Copy.mp4
    一次一个字节数组   快多了
 */
public class CopyFileDemo3a {
	public static void main(String[] args) throws IOException {

		// 封装数据源和目的地
		FileInputStream fis = new FileInputStream("e:\\abc.mp4");
		FileOutputStream fos = new FileOutputStream("Copy.mp4");

		byte[] bys = new byte[1024];
		int len = 0;
		while ((len = fis.read(bys)) != -1) {
			fos.write(bys, 0, len);
		}

		fis.close();
		fos.close();
	}
}

package org.lemon.BufferedInputStream;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *字节缓冲流
 *  字节缓冲输入流:BufferedInputStream
 *  BufferedInputStream(InputStream in) :指定默认缓冲区大小创建字节缓冲输入流对象
 */
public class BufferedInputStreamDemo {
   public static void main(String[] args) throws IOException {
	 //创建字节缓冲流对象  
	 BufferedInputStream bis = new BufferedInputStream(new FileInputStream("abc.txt"));
	 byte[] bys =new byte[1024];
	 int len = 0;
	 while((len=bis.read(bys))!=-1) {
		 
		 System.out.println(new String(bys,0,len));
	 }
	 bis.close();
}
}

package org.lemon.BufferedInputStream;

import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *  字节缓冲输入流:BufferedInputStream
 *  字节缓冲输出流:BufferedOutputStream
 *  缓冲流只是提供一个缓冲区,针对IO进行实现数据的传输实际是通过底层基本流进行实现的,所以缓冲流不能直接对文件操作
 */
public class BufferedOutputStreamDemo {
    public static void main(String[] args) throws IOException {
    	//创建字节输出缓冲流对象
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("abc.txt"));
	//写数据
		bos.write(97);
	//刷新缓冲区的流
		bos.flush();
		
		bos.close();
		//flush():刷新缓冲区的流,强迫将缓冲字节都写到该流中,刷新之后是可以写数据的.
	    //close():关闭流对象所指向指向的这个资源文件,一旦关闭,写数据,写不进去的!
		
	}
}

package org.lemon.Buffered;

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

/**
 * @author zhaojiangbo
 *BufferedWriter:
 * 		         public void newLine():写入一个换行符号
 * BufferReader:
 * 		         public String readLine():一次读取一行
 */
public class BufferedDemo {
  public static void main(String[] args) throws IOException {
	BufferedReader br = new BufferedReader(new FileReader("abc.txt"));

		Read(br);
	    write();
}

private static void Read(BufferedReader br) throws IOException {
	String line = null;
	while ((line = br.readLine()) != null) {
		System.out.println(line);
	}
	br.close();
}
private static void write() throws IOException {
    BufferedWriter bw = new BufferedWriter(new FileWriter("abc.txt"));
    for(int i = 0;i<10;i++) {
    	  bw.write("wo"+i);
    	  bw.newLine();
    	  bw.flush();
    }
      bw.close();
}

}

package org.lemon.Buffered;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class BufferedDemo2 {
  public static void main(String[] args) throws IOException {
	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	
	System.out.println("请输入一个整数");
	String str = br.readLine();
	int number = Integer.parseInt(str);
	System.out.println("你输入的是："+number);
	
}
}

package org.lemon.Buffered;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *BufferedReader(Reader in) :创建默认缓冲大小
 */
public class BufferedReaderDemo {
  public static void main(String[] args) throws IOException {
	BufferedReader br = new BufferedReader(new FileReader("a.txt"));
	//方式一
	int ch = 0;
	while((ch=br.read())!=-1) {
		System.out.println((char)ch);
	}
	br.close();
	//方式二
	char [] chs = new char[1024];
	int len= 0;
	while((len=br.read(chs))!=-1) {
		System.out.println(new String(chs,0,len));
	}
	br.close();
}
}

package org.lemon.Buffered;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *public BufferedWriter(Writer out):创建默认缓冲区大小的一个字符缓冲输出流
 */
public class BufferedWriterDemo {
  public static void main(String[] args) throws IOException {
	BufferedWriter bw = new BufferedWriter(new FileWriter("abc.txt"));
	bw.write("我");
	bw.write("依");
	bw.write("然");
	bw.write("爱");
	bw.write("你");
	
	bw.flush();
	
	bw.close();
	
}
}

package org.lemon.字节流;

import java.io.FileInputStream;
import java.io.IOException;

/**
 * @author zhaojiangbo
 *字节流一次读取一个字节,出现了中文乱码
 */
public class FileInputStreamDemo {
  public static void main(String[] args) throws IOException {
	FileInputStream fis = new FileInputStream("FileInputStreamDemo.java");
	int by =0;
	while((by=fis.read())!=-1) {
		System.out.println((char)by);
	}
	fis.close();
}
}

package org.lemon.字节流;

import java.io.IOException;
import java.util.Arrays;

public class StringDemo {
public static void main(String[] args) throws IOException {
		
		String s = "我爱你" ;
		
		//编码		
		//不写编码格式:默认GBK
		//byte[] bys = s.getBytes("GBK") ;
		byte[] bys = s.getBytes() ;
		System.out.println(Arrays.toString(bys));
		
		//解码
		
      //String str = new String(bys, "GBK") ;
		String str = new String(bys) ;//默认GBK
		System.out.println(str);
	}
}

package org.lemon.字符流;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * @author zhaojiangbo
 *字符输入流:字节输入流+编码格式(默认GBK)
 */
public class InputStreamReaderDemo {
   public static void main(String[] args) throws IOException {
	//创建字节输入流对象
	   InputStreamReader isr = new InputStreamReader(new FileInputStream("abc.txt"));
	// 读数据
	   char[] chs = new char[1024]; 
	   int len = 0;
	   while((len=isr.read(chs))!=-1) {
		   System.out.println(new String(chs,0,len));// 转换成字符串输出
	   }
	 //释放资源  
	   isr.close();
}
}

package org.lemon.字符流;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;

/**
 * @author zhaojiangbo
 *字符输出流:Writer:是一个抽象类   使用的是该抽象类的子类:OutputStreamWriter
 *字节输出流+编码格式---->字符输出流
 */
public class OutputStreamWriterDemo {
   public static void main(String[] args) throws IOException {
//OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("a.txt"),"GBK");   
	OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("a.txt"));//默认GBK
	
	osw.write("我爱高圆圆");
	
	osw.close();
}
}

package org.lemon.字符流;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

/**
 * @author zhaojiangbo
 *需求：把当前项目目录下的a.txt内容复制到当前项目目录下的b.txt中 使用字符流进行读写操作
 */
public class TestDemo {
   public static void main(String[] args) throws IOException {
	//创建字符转换输入流对象
	InputStreamReader isr = new InputStreamReader(new FileInputStream("a.txt"));
	//封装目的地
	OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("b.txt"));
	char[] chs =new char[1024];
	int len = 0;
	while((len=isr.read(chs))!=-1) {
		osw.write(chs,0,len);
		osw.flush();//刷新流
	}
	isr.close();
	osw.close();
}
}

package FileReader;

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

/**
 * @author zhaojiangbo
 *需求：把当前项目目录下的a.txt内容复制到当前项目目录下的b.txt中 使用字符流进行读写操作
 *使用 FileReader    FileWriter 较为便捷
 */
public class FileReaderDemo  {
	public static void main(String[] args) throws IOException {
   
   FileReader fr = new FileReader("a.txt");
   FileWriter fw = new FileWriter("b.txt");
   
   char [] chs =new char [1024];
   int len = 0;
   while((len=fr.read(chs))!=-1) {
	   fw.write(chs,0,len);
	   fw.flush();
   }
   fr.close();
   fw.close();
}
}