㈠ java中怎样从文件中读取数据
分为读字节，读字符两种读法x0dx0a◎◎◎FileInputStream 字节输入流读文件◎◎◎x0dx0apublic class Maintest {x0dx0ax0dx0apublic static void main(String[] args) throws IOException {x0dx0ax0dx0aFile f=new File("G:\\just for fun\\xiangwei.txt");x0dx0ax0dx0aFileInputStream fin=new FileInputStream(f);x0dx0ax0dx0abyte[] bs=new byte[1024];x0dx0ax0dx0aint count=0;x0dx0awhile((count=fin.read(bs))>0)x0dx0a{x0dx0ax0dx0aString str=new String(bs,0,count);//反复定义新变量：每一次都 重新定义新变量，接收新读取的滚雹数据x0dx0ax0dx0aSystem.out.println(str);//反复输出新变量：察槐每一次都 输出重大没帆新定义的新变量x0dx0a}x0dx0afin.close();x0dx0a}x0dx0a}x0dx0ax0dx0a◎◎◎FileReader 字符输入流读文件◎◎◎x0dx0apublic class Maintest {x0dx0apublic static void main(String[] args) throws IOException {x0dx0ax0dx0aFile f=new File("H:\\just for fun\\xiangwei.txt");x0dx0ax0dx0aFileReader fre=new FileReader(f);x0dx0ax0dx0aBufferedReader bre=new BufferedReader(fre);x0dx0ax0dx0aString str="";x0dx0awhile((str=bre.readLine())!=null)//●判断最后一行不存在，为空x0dx0a{x0dx0aSystem.out.println(str);x0dx0a}x0dx0abre.close();x0dx0a fre.close();x0dx0ax0dx0a}x0dx0ax0dx0a}