java 读写文件的代码。

java 读写文件的代码。

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;
 
public class T1116 {
	static String str = "生活本就是见招拆招，不必过分焦虑。";
	final static String FILE = "d:\\test.txt";
 
	static void fun1() throws IOException {
		File file = new File(FILE);
		FileOutputStream fos = new FileOutputStream(file);
		OutputStreamWriter osw = new OutputStreamWriter(fos, "utf-8");
		osw.write(str);
		osw.close();
		fos.close();
	}
 
	static void fun2() throws IOException {
		File file = new File(FILE);
		FileInputStream fis = new FileInputStream(file);
		InputStreamReader isr = new InputStreamReader(fis, "utf-8");
 
		int c = 0;
		System.out.println("内容:");
		while ((c = isr.read()) != -1)
			System.out.print((char) c);
		System.out.println();
		isr.close();
		fis.close();
 
	}
 
	// 利用缓冲流复制test.txt为my.txt。
	static void fun3() throws IOException {
		// 读文件
		File file = new File(FILE);
		File file1 = new File("my.txt");
		FileInputStream fis = new FileInputStream(file);
		InputStreamReader isr = new InputStreamReader(fis, "utf-8");
		BufferedReader br = new BufferedReader(isr);
 
		FileOutputStream fos = new FileOutputStream(file1);
		OutputStreamWriter osw = new OutputStreamWriter(fos, "utf-8");
		BufferedWriter bw = new BufferedWriter(osw);
 
		String line;
 
		while ((line = br.readLine()) != null) {
			bw.write(line);
		}
		bw.close();
		osw.close();
		fos.close();
		br.close();
		isr.close();
		fis.close();
		System.out.println("my.txt的位置是:" + System.getProperty("user.dir"));
	}
 
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		fun1();
		fun2();
		fun3();
 
	}
 
}