图片不变形缩放裁剪

LCG454872006 2012-10-06 06:26:29

最近做一个项目用到图片的上传操作，怎么实现图片的上传缩放裁剪后图片不变形。例如将图片经过处理后变成统一的高宽比例而图片不变形。请各位高手指教。

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sgyyz 2012-10-08

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package com.bean.tuil;



import java.awt.AlphaComposite;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.geom.AffineTransform;

import java.awt.image.AffineTransformOp;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.net.MalformedURLException;

import java.net.URL;

import java.util.Date;



import javax.imageio.ImageIO;



/**

 * 对图片的操作

 * 

 * @author yangyz

 * 

 */

public class ImageControl {

	// 添加字体的属性值

	private Font font = new Font("", Font.PLAIN, 12);



	private Graphics2D g = null;



	private int fontsize = 0;



	private int x = 0;



	private int y = 0;



	private String destDir = "F:\\";



	public void setDestDir(String path) {

		this.destDir = path;

		// 目录不存在

		File file = new File(path);

		if (!file.exists()) {

			file.mkdir();

		}

	}



	/**

	 * 导入本地图片到缓冲中

	 * 

	 * @param imgPath

	 * @return

	 */

	public BufferedImage loadImageLocal(String imgPath) {

		try {

			return ImageIO.read(new File(imgPath));

		} catch (IOException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

			return null;

		}

	}



	/**

	 * 读取网络中的图片到缓冲

	 * 

	 * @param imgPath

	 * @return

	 */

	public BufferedImage loadImageUrl(String imgPath) {

		URL url;

		try {

			url = new URL(imgPath);

			return ImageIO.read(url);

		} catch (MalformedURLException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

			return null;

		} catch (IOException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

			return null;

		}

	}



	/**

	 * 生成新图片到本地

	 * 

	 * @param newImage

	 *            新名字

	 * @param img

	 *            缓冲

	 * @param type

	 *            类别

	 */

	public void writeImageLocal(BufferedImage img, String type) {

		if (img != null) {

			File outputFile = new File(this.destDir + new Date().getTime()

					+ "." + type);

			try {

				ImageIO.write(img, type, outputFile);

			} catch (IOException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

		}

	}



	/**

	 * 设置文字字体，大小

	 * 

	 * @param fontStyle

	 * @param fontSize

	 */

	public void setFont(String fontStyle, int fontSize) {

		this.fontsize = fontSize;

		this.font = new Font(fontStyle, Font.PLAIN, fontSize);

	}



	/**

	 * 单行文本

	 * 

	 * @param img

	 * @param content

	 * @param x

	 * @param y

	 * @return

	 */

	public BufferedImage modifyImage(BufferedImage img, Object content) {

		try {

			int w = img.getWidth();

			int h = img.getHeight();



			g = img.createGraphics();

			g.setColor(Color.RED);

			if (this.font != null) {

				g.setFont(this.font);

			}



			// 文字输出位置

			this.y = h - fontsize - 10;

			this.x = w - 70;



			if (content != null) {

				g.drawString(content.toString(), this.x, this.y);

			}

			g.dispose();

		} catch (Exception e) {

			e.printStackTrace();

		}



		return img;

	}



	/**

	 * 将两张图片合并

	 * 

	 * @param base

	 * @param dest

	 *            目标

	 * @return

	 */

	public BufferedImage modifyImageTogether(BufferedImage base,

			BufferedImage dest) {

		try {

			int w = base.getWidth();

			int h = base.getHeight();



			int dw = dest.getWidth();

			int dh = dest.getHeight();



			g = dest.createGraphics();

			AlphaComposite cp = AlphaComposite.getInstance(

					AlphaComposite.SRC_OVER, 0.3f);

			g.setComposite(cp);

			g.drawImage(base, dw - w, dh - h, w, h, null);

			g.dispose();

		} catch (Exception e) {

			e.printStackTrace();

		}

		return dest;

	}



	/**

	 * 改变图片大小

	 * 

	 * @param img

	 * @param weight

	 * @param height

	 * @return

	 */

	public BufferedImage modifySize(BufferedImage img, int width, int height) {

		try {

			int w = img.getWidth();

			int h = img.getHeight();



			double wRation = (new Integer(width)).doubleValue() / w;

			double hRation = (new Integer(height)).doubleValue() / h;

			Image image = img.getScaledInstance(width, height,

					Image.SCALE_SMOOTH);



			AffineTransformOp op = new AffineTransformOp(AffineTransform

					.getScaleInstance(wRation, hRation), null);



			image = op.filter(img, null);



			img = (BufferedImage) image;

		} catch (Exception e) {

			e.printStackTrace();

		}



		return img;

	}



	public BufferedImage changeSize(BufferedImage img, int width, int height) {

		try {

			BufferedImage distin = new BufferedImage(width, height,

					BufferedImage.TYPE_INT_RGB);

			g = distin.createGraphics();

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

			return distin;

		} catch (Exception e) {

			e.printStackTrace();

			return null;

		}

	}



	/**

	 * 截图

	 * 

	 * @param img

	 * @param x

	 * @param y

	 * @param width

	 * @param height

	 * @return

	 */

	public BufferedImage cutImage(BufferedImage img, int x, int y, int width,

			int height) {

		BufferedImage distin = new BufferedImage(width, height,

				BufferedImage.TYPE_INT_RGB);

		try {

			g = distin.createGraphics();

			// 原图的大小，以及截图的坐标及大小

			g.drawImage(img, 0, 0, width, height, x, y, width, height, null);

		} catch (Exception e) {

			e.printStackTrace();

		}

		return distin;

	}



	/**

	 * 测试

	 * 

	 * @param args

	 */

	public static void main(String[] args) {

		ImageControl ic = new ImageControl();



		// 两张图片合并

		BufferedImage d = ic

				.loadImageLocal("C:\\Documents and Settings\\yangyz\\Desktop\\MyAPP\\catergory_list_right.jpg");

		BufferedImage b = ic

				.loadImageLocal("C:\\Documents and Settings\\yangyz\\Desktop\\MyAPP\\ico_exPlore_home_sports_bundles_selected.png");

		ic.setDestDir("f:\\temp\\");

		ic.writeImageLocal(ic.modifyImageTogether(b, d), "jpg");



		// 在向生成的图片添加文字

		ic.modifyImage(d, "Troy Young");

		// // 根据坐标截图

		// BufferedImage d = ic

		// .loadImageLocal("C:\\Documents and Settings\\yangyz\\Desktop\\MyAPP\\catergory_list_right.jpg");

		// ic.setDestDir("f:\\temp\\");

		ic.writeImageLocal(ic.cutImage(d, 30, 20, 200, 100), "jpg");

		// 修改图片大小

		// BufferedImage d = ic

		// .loadImageLocal("C:\\Documents and Settings\\yangyz\\Desktop\\MyAPP\\catergory_list_right.jpg");

		// ic.setDestDir("f:\\temp\\");

		ic.writeImageLocal(ic.modifySize(d, 210, 175), "jpg");



		System.out.println("成功");

	}

}