java中对图片进行压缩以及放大。

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.math.BigDecimal;

import javax.imageio.ImageIO;

public class ImageUtils

{

/**

* 对图片进行放大

*

* @param originalImage 原始图片

* @param times 放大倍数

* @return

*/

public static BufferedImage zoomInImage(BufferedImage originalImage, Integer times)

{

int width = originalImage.getWidth() * times;

int height = originalImage.getHeight() * times;

BufferedImage newImage = new BufferedImage(width, height, originalImage.getType());

Graphics g = newImage.getGraphics();

g.drawImage(originalImage, 0, 0, width, height, null);

g.dispose();

return newImage;

}

/**

* 对图片进行放大

*

* @param srcPath 原始图片路径(绝对路径)

* @param newPath 放大后图片路径（绝对路径）

* @param times 放大倍数

* @param format 图片格式

* @return 是否放大成功

*/

public static boolean zoomInImage(String srcPath, String newPath, Integer times, String format)

{

BufferedImage bufferedImage = null;

try

{

File of = new File(srcPath);

if (of.canRead())

{

bufferedImage = ImageIO.read(of);

}

} catch (IOException e)

{

// TODO: 打印日志

return false;

}

if (bufferedImage != null)

{

bufferedImage = zoomInImage(bufferedImage, times);

try

{

// TODO: 这个保存路径需要配置下子好一点

ImageIO.write(bufferedImage, format, new File(newPath)); // 保存修改后的图像

} catch (IOException e)

{

// TODO 打印错误信息

return false;

}

}

return true;

}

/**

* 对图片进行缩小

*

* @param originalImage 原始图片

* @param times 缩小倍数

* @return 缩小后的Image

*/

public static BufferedImage zoomOutImage(BufferedImage originalImage, int timeshieght)

{

int width = originalImage.getWidth() / timeshieght;

int height = originalImage.getHeight() / timeshieght;

BufferedImage newImage = new BufferedImage(width, height, originalImage.getType());

Graphics g = newImage.getGraphics();

g.drawImage(originalImage, 0, 0, width, height, null);

g.dispose();

return newImage;

}

/**

* 对图片进行缩小

*

* @param srcPath 源图片路径（绝对路径）

* @param newPath 新图片路径（绝对路径）

* @param times 缩小倍数

* @param format 图片格式

* @return 保存是否成功

*/

public static boolean zoomOutImage(String srcPath, String newPath, int timeshieght,

String format)

{

BufferedImage bufferedImage = null;

try

{

File of = new File(srcPath);

if (of.canRead())

{

bufferedImage = ImageIO.read(of);

}

} catch (IOException e)

{

// TODO: 打印日志

return false;

}

if (bufferedImage != null)

{

bufferedImage = zoomOutImage(bufferedImage, timeshieght);

try

{