java _io_文件讀取標(biāo)準(zhǔn)步驟

File f =new File("~"); //創(chuàng)建源
InputStream is =new FileInputStream(f); //選擇流
is.read() 讀取單個數(shù)據(jù)，并使游標(biāo)下移 //操作(讀取)
is.close() //釋放資源,輸入流讀取后必須釋放資源

public class test{

public static void main(String[]args) 
{
    //創(chuàng)建源
    File f=new File("C:/Users/10853/eclipse-workspace/hell/src/hell/abc");
    InputStream is =null;//提升is的作用域，避免在try中聲明后，作用域
                        //只在try，finally中語句無法執(zhí)行
    //選擇流
    try {
         is =new FileInputStream(f);
    //操作(讀取)    
        int temp;
        while((temp=is.read())!=-1) //temp=is.read()表達(dá)式整體的值就是temp的值
        {                           //is.read()會讀取單個數(shù)據(jù)，當(dāng)數(shù)據(jù)讀取完畢時，返回-1
            System.out.println((char)temp);
        }

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally
    {
        try {
            if(null!=is)//當(dāng)is創(chuàng)建成功時才執(zhí)行關(guān)閉
            {
                is.close();
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

} 
}