java图片压缩imageio-Java压缩图片()报错

java压缩图片,按照比例进行压缩

public static void main(String[] args) {

try {

//图片所在路径

BufferedImage templateImage = (new File("C:\\Users\\晏丁丁\\Pictures\\图片1.png"));

//原始图片的长度和宽度

int height = ();

int width = ();

//通过比例压缩

float scale = 0.5f;

//通过固定长度压缩

/*int doWithHeight = 100;

int dowithWidth = 300;*/

//压缩之后的长度和宽度

int doWithHeight = (int) (scale * height);

int dowithWidth = (int) (scale * width);

BufferedImage finalImage = new BufferedImage(dowithWidth, doWithHeight, _INT_RGB);

().drawImage((dowithWidth, doWithHeight, _SMOOTH), 0, 0, null);

//图片输出路径,以及图片名

FileOutputStream fileOutputStream = new FileOutputStream("D:/image/");

JPEGImageEncoder encoder = (fileOutputStream);

(finalImage);

();

} catch (IOException e) {

e.printStackTrace();

}

}

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文章知

BufferedImage sourceImg =(new FileInputStream(new File(toPath)));

或者

BufferedImage sourceImg =(new File(toPath));

可以使用Draw这个类,通过改变像素来改变存储大小,实例如下:

public static boolean compressPic(String srcFilePath, String descFilePath) throws IOException {

        File file = null;

        BufferedImage src = null;

        FileOutputStream out = null;

        ImageWriter imgWrier;

        ImageWriteParam imgWriteParams;

        // 指定写图片的方式为 jpg

        imgWrier = ("jpg").next();

        imgWriteParams = new (

                null);

        // 要使用压缩,必须指定压缩方式为MODE_EXPLICIT

        (_EXPLICIT);

        // 这里指定压缩的程度,参数qality是取值0~1范围内,

        ((float) 1);

        (_DISABLED);

        ColorModel colorModel =(new File(srcFilePath)).getColorModel();// ();

        // 指定压缩时使用的色彩模式

//        (new (

//                colorModel, (16, 16)));

        (new (

                colorModel, (16, 16)));

        try {

            if (isBlank(srcFilePath)) {

                return false;

            } else {

                file = new File(srcFilePath);(());

                src = (file);

                out = new FileOutputStream(descFilePath);

                ();

                // 必须先指定 out值,才能调用write方法, ImageOutputStream可以通过任何

                // OutputStream构造

                ((out));

                // 调用write方法,就可以向输入流写图片

                (null, new IIOImage(src, null, null),

                        imgWriteParams);

                ();

                ();

            }

        } catch (Exception e) {

            e.printStackTrace();

            return false;

        }

        return true;

    }

public static boolean isBlank(String string) {

        if (string == null || () == 0 || ().equals("")) {

            return true;

        }

        return false;

    }