复制图片，Bufferedreader,bufferedwriter,序列化，反序列化

野性酷女 2022-05-18 05:09 163阅读 0赞

package com.job;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    
    public class renwuyi {
    
    	public static void main(String[] args) throws Exception {
    		// TODO Auto-generated method stub
               File file =new File("D:\\a.jpg");//要复制的图片
               File file2 =new File("D:\\a\\b.jpg");//
               file2.createNewFile();
               FileInputStream fis=new FileInputStream(file);
               FileOutputStream fos =new FileOutputStream(file2);
               int len =fis.available();
               //边读边写  如果用fileinputstream读汉字，速度比较慢，一次读8bit
               for (int i = 0; i < len; i++) {
    			fos.write(fis.read());//边读边写
    		}
               fos.close();fis.close();
    	}
    
    }

package com.job;
    
    import java.io.BufferedReader;
    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileWriter;
    import java.io.InputStreamReader;
    
    public class BufferReadtest {
    
    	public static void main(String[] args) throws Exception {
    		// TODO Auto-generated method stub
    //        FileInputStream fis=new FileInputStream("D:\\a.txt");
    //        InputStreamReader isr=new InputStreamReader(fis);
    //        BufferedReader br=new BufferedReader(isr);
    //        String str="";
    //        while((str=br.readLine())!=null){
    //        	System.out.println(str);
    //        }
    //        br.close();
         //BufferedWriter 
            File file=new File("d:\\a\\a.txt");
            FileWriter fw=new FileWriter(file);
            BufferedWriter bw=new BufferedWriter(fw);
            String str="你好，我的祖国\b我心有我";
            bw.write(str);
            str="人生百味,尝多无味";
            bw.newLine();
            bw.write(str);
            bw.close();
            
            
    	}
    
    }

package com.job;
    
    import java.io.BufferedReader;
    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.io.InputStreamReader;
    
    public class BufferedBufferWriteTest {
    
    	public static void main(String[] args) throws Exception {
    		// TODO Auto-generated method stub
            FileInputStream fis=new FileInputStream("D:\\a.txt");
            InputStreamReader isr=new InputStreamReader(fis);
            BufferedReader br=new BufferedReader(isr);
         
    //        br.close();
         //BufferedWriter 
            File file=new File("d:\\a\\d.txt");
            FileWriter fw=new FileWriter(file);
            BufferedWriter bw=new BufferedWriter(fw);
    //        String str="你好，我的祖国\b我心有我";
            String str="";
            while((str=br.readLine())!=null){
            	System.out.println(str);
            	 bw.write(str);
            	  	bw.newLine();
            } 
            str="人生百味,尝多无味";
            bw.newLine();
            bw.write(str);
            bw.close();
            br.close();
    
    	}
    
    }

package com.entriy;
    
    import java.io.Serializable;
    
    public class student implements Serializable {
    	private String name;
    	private String sex;
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public String getSex() {
    		return sex;
    	}
    	public void setSex(String sex) {
    		this.sex = sex;
    	}
    	public student(String name, String sex) {
    		super();
    		this.name = name;
    		this.sex = sex;
    	}
    	public student() {
    		super();
    	}
    	
    
    }

package com.entriy;
    import java.io.EOFException;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.ObjectInputStream;
    import java.io.ObjectOutputStream;
    
    public class test {
    
    	public static void main(String[] args)  throws Exception {
    		// TODO Auto-generated method stub
    		//------序列化   ObjectOutputStream  对对象进行操作 
    		//------序列化的文本是二进制  
    		/* 1.创建一个类
    		 * 2.实例化一个对象 赋值
    		 * 实例化
    		 * 4.写
    		 * 5.关闭流
    		 * 有可能出现NotSerializableException异常
    		 * 解决方法就是被实例化的类要实现Serializable接口
    		 * 序列化的文本是二进制，想要查看的话需要反序列化。
    		  */		
    		student stu=new student("小王","男");
    		System.out.println(stu);
    		FileOutputStream fos=new FileOutputStream("D:\\a\\new.txt");
    		ObjectOutputStream op=new ObjectOutputStream(fos);
    		op.writeObject(stu);
    		op.close();		
    		
    		//--------反序列化   ObjectInputStream
    		FileInputStream fis=new FileInputStream("D:\\a\\new.txt");
    		ObjectInputStream ois=new ObjectInputStream(fis);
    		student stu1=(student) ois.readObject();
    		System.out.println(stu1.getName()+"\t"+stu1.getSex());
    		ois.close();//关闭流
    
    	}
    
    }

package com.entriy;
    
    import java.awt.List;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.ObjectInputStream;
    import java.io.ObjectOutputStream;
    import java.util.ArrayList;
    
    public class duoduixiang {
    
    	public static void main(String[] args) throws Exception {
    		// TODO Auto-generated method stub
    		//---------------多个对象-------------//需要把对象放到集合里面
    		student stu1 = new student("小王", "男");
    		student stu2 = new student("小明", "男");
    		student stu3 = new student("小丹", "女");
    		ArrayList<student> list=new ArrayList<student>();
    		list.add(stu1);list.add(stu2);list.add(stu3);
    		FileOutputStream fos = new FileOutputStream("D:\\a\\new.txt");
    		ObjectOutputStream op = new ObjectOutputStream(fos);
    		op.writeObject(list);
    		op.close();
    		FileInputStream fis=new FileInputStream("D:\\a\\new.txt");
    		ObjectInputStream ois=new ObjectInputStream(fis);
    		ArrayList<student> list1= (ArrayList<student>) ois.readObject();
    		for (int i = 0; i <list1.size(); i++) {
    			System.out.println(list.get(i).getName()+"\t"+list.get(i).getSex());
    		}
    		
    		ois.close();
    
    	}
    
    }