java文件读和写

心已赠人 2022-05-21 00:22 199阅读 0赞

java对文件的读操作和写操作

将数据写入文件

package priv.lg.file.tools;
    
    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStreamWriter;
    
    public class FileWrite {
    	public void writeFile(File file,int[] ary){
    		try {
    			
    			FileOutputStream fos = new FileOutputStream(file);
    			
    			OutputStreamWriter osw = new OutputStreamWriter(fos,"UTF-8");
    			BufferedWriter bw = new BufferedWriter(osw);
    			for(int i=0;i<ary.length;i++){
    				//System.out.print(ary[i]);
    				bw.write(ary[i]+" ");
    				
    			}
    			bw.flush();
    			bw.close();
    			
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    	}
    	
    	public void writeFileByBytes(File file,String connect){
    		try {
    			FileOutputStream fos = new FileOutputStream(file);
    			byte[] date=connect.getBytes("UTF-8");
    			fos.write(date);
    			fos.flush();
    			fos.close();
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		
    	}
    	
    	public static void main(String[] args) {
    		
    		String path="D:/txt.txt";
    		//FileCreate fc = new FileCreate();
    		//fc.fileCreate(path);
    		
    		File file = new File(path);
    		
    		FileWrite fw = new FileWrite();
    		
    		int[] arys={1,2,3,4,5};
    		//String arys="s睡大觉12313";
    		fw.writeFile(file, arys);
    		
    		fw.writeFileByBytes(file, "123456");
    	}
    }

将数据从文件中读出

package priv.lg.file.tools;
    
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.InputStreamReader;
    
    public class FileRead {
    	
    	public void readFile(File file){
    		try {
    			FileInputStream fis = new FileInputStream(file);
    			InputStreamReader isr = new InputStreamReader(fis, "UTF-8");
    			BufferedReader br = new BufferedReader(isr);
    			String str = null;
    			while((str=br.readLine())!=null){
    				System.out.println(str);
    			}
    			br.close();
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		
    	}
    	
    	public static void main(String[] args) {
    		FileRead fr = new FileRead();
    		fr.readFile(new File("D:/txt.txt"));
    	}
    	
    }