Java读取图片像素和大小

package com.aa.promotion.dao.generalize;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.nio.channels.FileChannel;

import javax.imageio.ImageIO;

public class UmpGeneralizeDAO {

public static void main(String[] args) {

File file = new File("E:\\test.jpg");

FileChannel fc = null;

if(file.exists() && file.isFile()){

try {

FileInputStream fs = new FileInputStream(file);

fc = fs.getChannel();

System.out.println(fc.size() + "-----fc.size()");

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

System.out.println(file.length() + "-----file.length  B");

System.out.println(file.length() * 1024 + "-----file.length  kb");

BufferedImage bi = null;

try {

bi = ImageIO.read(file);

} catch (IOException e) {

e.printStackTrace();

}

int width = bi.getWidth();

int height = bi.getHeight();

System.out.println("宽：像素-----" + width + "高：像素"  + height);

}

}

获取到的图片大小默认为B

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