java.io几种读写文件的方式

　　　　 //读取文件(字节流)        InputStream in = new FileInputStream("d:\1.txt");        //写入相应的文件        OutputStream out = new FileOutputStream("d:\2.txt");        //读取数据        //一次性取多少字节        byte[] bytes = new byte[2048];        //接受读取的内容(n就代表的相关数据，只不过是数字的形式)        int n = -1;        //循环取出数据        while ((n = in.read(bytes,0,bytes.length)) != -1) {            //转换成字符串            String str = new String(bytes,0,n,"GBK"); #这里可以实现字节到字符串的转换，比较实用            System.out.println(str);            //写入相关文件            out.write(bytes, 0, n);        }        //关闭流        in.close();        out.close();

　　　　        //读取文件(缓存字节流)        BufferedInputStream in = new BufferedInputStream(new FileInputStream("d:\1.txt"));        //写入相应的文件        BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream("d:\2.txt"));        //读取数据        //一次性取多少字节        byte[] bytes = new byte[2048];        //接受读取的内容(n就代表的相关数据，只不过是数字的形式)        int n = -1;        //循环取出数据        while ((n = in.read(bytes,0,bytes.length)) != -1) {            //转换成字符串            String str = new String(bytes,0,n,"GBK");            System.out.println(str);            //写入相关文件            out.write(bytes, 0, n);        }        //清楚缓存        out.flush();        //关闭流        in.close();        out.close();

　　　　 //读取文件(字节流)        InputStreamReader in = new InputStreamReader(new FileInputStream("d:\1.txt"),"GBK");        //写入相应的文件        OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream("d:\2.txt"));        //读取数据        //循环取出数据        byte[] bytes = new byte[1024];        int len = -1;        while ((len = in.read()) != -1) {            System.out.println(len);            //写入相关文件            out.write(len);        }        //清楚缓存        out.flush();        //关闭流        in.close();        out.close();

　　　　 //读取文件(字符流)        BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream("d:\1.txt"),"GBK"));#这里主要是涉及中文        //BufferedReader in = new BufferedReader(new FileReader("d:\1.txt")));        //写入相应的文件        BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("d:\2.txt"),"GBK"));        //BufferedWriter out = new BufferedWriter(new FileWriter("d:\2.txt"))；        //读取数据        //循环取出数据        String str = null;        while ((str = in.readLine()) != null) {            System.out.println(str);            //写入相关文件            out.write(str);            out.newLine();        }                //清楚缓存        out.flush();        //关闭流        in.close();        out.close();

　　　　 //读取文件(字节流)        Reader in = new InputStreamReader(new FileInputStream("d:\1.txt"),"GBK");        //写入相应的文件        PrintWriter out = new PrintWriter(new FileWriter("d:\2.txt"));        //读取数据        //循环取出数据        byte[] bytes = new byte[1024];        int len = -1;        while ((len = in.read()) != -1) {            System.out.println(len);            //写入相关文件            out.write(len);        }        //清楚缓存        out.flush();        //关闭流        in.close();        out.close();