图片压缩Java代码

xiaoyeshen · 2014-11-17 20:06 · 1244次阅读

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

/**
 * 
 * @author 可乐加糖
 */
public class CompressPicDemo {
	private File file = null; // 文件对象
	private String inputDir; // 输入图路径
	private String outputDir; // 输出图路径
	private String inputFileName; // 输入图文件名
	private String outputFileName; // 输出图文件名
	private int outputWidth = 100; // 默认输出图片宽
	private int outputHeight = 100; // 默认输出图片高
	private boolean proportion = true; // 是否等比缩放标记(默认为等比缩放)

	public CompressPicDemo() { // 初始化变量
		inputDir = "";
		outputDir = "";
		inputFileName = "";
		outputFileName = "";
		outputWidth = 100;
		outputHeight = 100;
	}

	public void setInputDir(String inputDir) {
		this.inputDir = inputDir;
	}

	public void setOutputDir(String outputDir) {
		this.outputDir = outputDir;
	}

	public void setInputFileName(String inputFileName) {
		this.inputFileName = inputFileName;
	}

	public void setOutputFileName(String outputFileName) {
		this.outputFileName = outputFileName;
	}

	public void setOutputWidth(int outputWidth) {
		this.outputWidth = outputWidth;
	}

	public void setOutputHeight(int outputHeight) {
		this.outputHeight = outputHeight;
	}

	public void setWidthAndHeight(int width, int height) {
		this.outputWidth = width;
		this.outputHeight = height;
	}

	/**
	 * 获得图片大小 传入参数 String path :图片路径
	 */
	public long getPicSize(String path) {
		file = new File(path);
		return file.length();
	}

	// 图片处理
	public String compressPic() {
		try {
			// 获得源文件
			file = new File(inputDir + inputFileName);
			if (!file.exists()) {
				return "";
			}
			Image img = ImageIO.read(file);
			// 判断图片格式是否正确
			if (img.getWidth(null) == -1) {
				System.out.println(" can't read,retry!" + "
");
				return "no";
			} else {
				int newWidth;
				int newHeight;
				// 判断是否是等比缩放
				if (this.proportion == true) {
					// 为等比缩放计算输出的图片宽度及高度
					double rate1 = ((double) img.getWidth(null))
							/ (double) outputWidth + 0.1;
					double rate2 = ((double) img.getHeight(null))
							/ (double) outputHeight + 0.1;
					// 根据缩放比率大的进行缩放控制
					double rate = rate1 > rate2 ? rate1 : rate2;
					newWidth = (int) (((double) img.getWidth(null)) / rate);
					newHeight = (int) (((double) img.getHeight(null)) / rate);
				} else {
					newWidth = img.getWidth(null); // 输出的图片宽度
					newHeight = img.getHeight(null); // 输出的图片高度
				}
				BufferedImage tag = new BufferedImage((int) newWidth,
						(int) newHeight, BufferedImage.TYPE_INT_RGB);

				/**
				 * Image.SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的 优先级比速度高 生成的图片质量比较好 但速度慢
				 */
				tag.getGraphics().drawImage(
						img.getScaledInstance(newWidth, newHeight,
								Image.SCALE_SMOOTH), 0, 0, null);
				FileOutputStream out = new FileOutputStream(outputDir
						+ outputFileName);
				// JPEGImageEncoder可适用于其他图片类型的转换
				JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
				encoder.encode(tag);
				out.close();
			}
		} catch (IOException ex) {
			ex.printStackTrace();
		}
		return "ok";
	}

	public String compressPic(String inputDir, String outputDir,
			String inputFileName, String outputFileName) {
		// 输入图路径
		this.inputDir = inputDir;
		// 输出图路径
		this.outputDir = outputDir;
		// 输入图文件名
		this.inputFileName = inputFileName;
		// 输出图文件名
		this.outputFileName = outputFileName;
		return compressPic();
	}

	public String compressPic(String inputDir, String outputDir,
			String inputFileName, String outputFileName, int width, int height,
			boolean gp) {
		// 输入图路径
		this.inputDir = inputDir;
		// 输出图路径
		this.outputDir = outputDir;
		// 输入图文件名
		this.inputFileName = inputFileName;
		// 输出图文件名
		this.outputFileName = outputFileName;
		// 设置图片长宽
		setWidthAndHeight(width, height);
		// 是否是等比缩放 标记
		this.proportion = gp;
		return compressPic();
	}

	// main测试
	// compressPic(大图片路径,生成小图片路径,大图片文件名,生成小图片文名,生成小图片宽度,生成小图片高度,是否等比缩放(默认为true))
	public static void main(String[] arg) {
		CompressPicDemo mypic = new CompressPicDemo();
		System.out.println("输入的图片大小:" + mypic.getPicSize("e:\\1.jpg") / 1024
				+ "KB");
		mypic.compressPic("e:\\", "e:\\", "1.jpg", "r1.jpg", 120, 120,
				false);

	}
}

注:转http://www.qcoke.com/?p=1162(好用的Java图片处理http://tzwzero-163-com.iteye.com/blog/1701765)

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