Question

使用Java文件流将"E:\\kj.txt"文件中的内容复制到"D:\\new.txt".

Answer 1

import java.io.*;
public class copy
{
	public static void main(String args[]) throws IOException
	{
		int i;
		FileReader fr;
		FileWriter fw;
		try
		{
			fr=new FileReader("E:\\kj.txt");
		}
		catch(FileNotFoundException e)
		{
			System.out.println("not found this file");
			return;
		}
		try
		{
			fw=new FileWriter("D:\\new.txt");
		}
		catch(FileNotFoundException e)
		{
			System.out.println("error");
			return;
		}catch(IOException e){
			System.out.println("wrong");
			return;
		}
		try
		{
			i=fr.read();
			while(i!=-1)
			{
				fw.write(i);
				i=fr.read();
			}
			
			fr.close();
			fw.close();
		}
		catch(IOException e)
		{
			System.out.println("error");
		}
	}
}

Answer 2

import java.io.*;

/**
* Created by liguoqing on 2016/3/28.
*/
public class ReadTxtFile {

public static void readTxt(String filePath) {

try {
File file = new File(filePath);
if(file.isFile() && file.exists()) {
InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "utf-8");
BufferedReader br = new BufferedReader(isr);
String lineTxt = null;
while ((lineTxt = br.readLine()) != null) {
System.out.println(lineTxt);
}
br.close();
} else {
System.out.println("文件不存在!");
}
} catch (Exception e) {
System.out.println("文件读取错误!");
}

}

public static void main(String[] args) {
String filePath = "D:\\test\\我.txt";
readTxt(filePath);
}