关于IO流和文件的个人理解

古城微笑少年丶 2022-05-17 05:47 373阅读 0赞

我是个喜欢代码的人~

package io;
    import java.io.File;
    import java.io.IOException;
    //关于File常用的方法总结
    public class file_ {
    	public static void main(String[] args) {
    		File file = new File("E:\\IO1");
    		File file1 =  new File(file,"if");
    		File file2 = new File(file,"you");
    		
    		file2.mkdir();
    		file1.mkdirs();
    		
    		System.out.println(file2.getParent());
    		System.out.println(file.getAbsolutePath());
    		
    		File file3 = new File("E:\\IO1\\Create1");
    		try {
    			if(file3.createNewFile()) {
    				System.out.println("fine");
    			}
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    		
    		if(file3.exists()) {
    			System.out.println("exist");
    		}
    		
    		if(file2.isDirectory()) {
    			System.out.println("path file ");
    		}
    		
    		if(file3.isFile()) {
    			System.out.println("is norm file");
    		}
    		
    		if(file3.delete()) {
    			System.out.println("delete");
    		}
    		
    		String[] lists = file.list();
    		for(String li:lists) {
    			System.out.println(li);
    		}
    		
    		File[] files = file.listFiles();
    		for(File file5:files) {
    			System.out.println(file5.getAbsolutePath());
    		}
    		
    		
    		
    	}
    }

package io;
    
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    public class Io_ {
    
    	public static void main(String[] args) {
    		//字节流
    		FileInputStream input  =null;//常用方法  int read(),int read(byte[]b),void close()
    		FileOutputStream ouput =null;//常用方法void write(int b),int write(byte[]b,begin,long);void close()
    		try {
    			ouput = new FileOutputStream("E:\\IO1\\f");
    			input = new FileInputStream("E:\\gaohuqun\\ec\\eclipse\\artifacts.xml");
    			byte []b=new byte[1024];
    			int a;
    			while((a=input.read(b))!=-1) {
    				ouput.write(b,0,a);
    			}
    			ouput.flush();
    		} catch (FileNotFoundException e) {
    			e.printStackTrace();
    		} catch (IOException e) {
    			e.printStackTrace();
    		}finally {
    			if(input!=null) {
    				try {
    					input.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    			if(ouput!=null) {
    				try {
    					ouput.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    		}
    	}
    }

package io;
    
    import java.io.FileNotFoundException;
    import java.io.FileReader;
    import java.io.FileWriter;
    import java.io.IOException;
    
    public class Io__ {
    
    	public static void main(String[] args) {
    		FileReader  filereader = null;
    		FileWriter  filewriter = null;
    		try {
    			filereader = new FileReader("E:\\IO1\\a.txt");//int read,int read(char[]b),void close()
    			filewriter = new FileWriter("E:\\IO1\\b.txt",true);//void write(int c) void write(char[] ,begin ,len)
    			char [] c =new char[1024];
    			int a;
    			while((a=filereader.read(c))!=-1) {
    				filewriter.write(c, 0, a);
    			}
    			filewriter.flush();
    		} catch (FileNotFoundException e) {
    			e.printStackTrace();
    		} catch (IOException e) {
    			e.printStackTrace();
    		}finally {
    			if(filereader!=null) {
    				try {
    					filereader.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    			if(filewriter!=null) {
    				try {
    					filewriter.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    		}
    		}
    	}
    	
    }