编写程序实现将一个文件复制到另一个文件中。

	
	

		
		

			
			

				楼上的也叫简洁？
			

		

	

	

		import java.io.File;
	

	

		import java.nio.file.Files;
	

	

		public class copy {
	

	

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

	

		 if (args.length < 2){
	

	

		 System.out.println("请输入正确的参数");
	

	

		 System.exit(1);
	

	

		 }
	

	

		 Files.copy(new File(args[0]).toPath(), new File(args[1]).toPath());
	

	

		 }
	

	

		}
	

import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
public class CopyFile_FileUtils {
    public static void main(String[] args) throws IOException {
        FileUtils.copyFile(new File("abc.txt"), new File("abc-copy.txt"));
    }
}

	package cn.edu.jxnu.others;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
public class FileReadToWrite {
    public static void main(String[] args) throws IOException {
        System.out.println("请依次输入：源文件路径 目标文件路径！");
        if(args.length<2){
            System.out.println("参数不合法！");
            System.exit(0);
        }
        String path = args[0];
        String target = args[1];
        String resultString = FileReadToWrite.readFile(path);
        FileReadToWrite.writeToFile(target, resultString);
    }
    public static String readFile(String path) throws IOException {
        File file = new File(path);
        if(!file.exists()){
            System.out.println("源文件不存在！");
            System.exit(1);
        }
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file), "utf-8"));
        char[] buf = new char[1024];// 设置一个1024字符的缓冲区
        StringBuffer stringBuffer = new StringBuffer();
        try {
            while (br.read(buf) > 0) {
                stringBuffer.append(buf);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            br.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return stringBuffer.toString();
    }
    /**
     * @description 复制的路径，和文件字节流
     * @param path
     * @param bytes
     * @throws IOException
     */
    public static void writeToFile(String path, String result) throws IOException {
        File f = new File(path);
        PrintWriter outPrintWriter = new PrintWriter(
                new BufferedWriter(new OutputStreamWriter(new FileOutputStream(f), "UTF-8")));
        outPrintWriter.write(result);
        outPrintWriter.flush();// 迫使缓冲区被输出
        outPrintWriter.close();
    }
}