Java读写文件

最新推荐文章于 2019-12-23 22:12:54 发布

原创最新推荐文章于 2019-12-23 22:12:54 发布 · 511 阅读

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#java #io

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本文通过两个示例介绍了Java中使用InputStream和OutputStream进行文件读写的基本操作，包括创建实例、读取和写入文件内容，并进行了错误处理和资源关闭。

Java读写文件最常用的就是InputStream和OutputStream,今天写了两个例子，作为记录，高手略过！

1.InputStream和OutputStream

package com.wicresoft.demo;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;

public class CopyFile {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		FileInputStream in = null;
		FileOutputStream out = null;
		
		System.out.println("copy file start");
		try {
			
			//in = new FileInputStream("input.txt");
			//out = new FileOutputStream("output.txt");
			
			in = new FileInputStream("D:/MyEclipseProject/IODemo/src/com/wicresoft/demo/input.txt");
			out = new FileOutputStream("D:/MyEclipseProject/IODemo/src/com/wicresoft/demo/output.txt");
			
			int c;
			while ((c = in.read()) != -1) {
				out.write(c);
			}
			System.out.println("copy file success");
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if (in != null) {
				try {
					in.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
	        }
	        if (out != null) {
	            try {
					out.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
	        }
		}
	}
}

2.sys.in

package com.wicresoft.demo;

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

public class ReadConsole {
	public static void main(String args[]) throws IOException
	   {
	      InputStreamReader cin = null;

	      try {
	         cin = new InputStreamReader(System.in);
	         System.out.println("Enter characters, 'q' to quit.");
	         char c;
	         do {
	            c = (char) cin.read();
	            System.out.print(c);
	         } while(c != 'q');
	      }finally {
	         if (cin != null) {
	            cin.close();
	         }
	      }
	   }
}

关于Java i/o 更多详细内容：http://www.tutorialspoint.com/java/java_files_io.htm