java 读入文件 FileInputStream

package com.mkyong.io;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
 
public class ReadFileExample {
 
    public static void main(String[] args) {
 
        File file = new File("C:/robots.txt");
        FileInputStream fis = null;
 
        try {
            fis = new FileInputStream(file);
 
            System.out.println("Total file size to read (in bytes) : "
                    + fis.available());
 
            int content;
            while ((content = fis.read()) != -1) {
                // convert to char and display it
                System.out.print((char) content);
            }
 
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fis != null)
                    fis.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}

JDK1.7 可用

package com.mkyong.io;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
 
public class ReadFileExample {
 
    public static void main(String[] args) {
 
        File file = new File("C:/robots.txt");
 
        try (FileInputStream fis = new FileInputStream(file)) {
 
            System.out.println("Total file size to read (in bytes) : "+ fis.available());
 
            int content;
            while ((content = fis.read()) != -1) {
                // convert to char and display it
                System.out.print((char) content);
            }
 
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}