Im4java+GraphicsMagick 图片处理工具

package com.jeeplus.modules.isp.utils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.commons.lang3.SystemUtils;
import org.im4java.core.ConvertCmd;
import org.im4java.core.IM4JavaException;
import org.im4java.core.IMOperation;
import org.im4java.process.Pipe;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.jeeplus.modules.isp.service.impl.MongoFileServiceImp;

/**
 * 图片处理工具<br>
 * 代码实现类将图片装换压缩成固定的大小格式的图片<br>
 * 使用工具为im4java+GraphicsMagick-1.3.24-Q8<br>
 * 参考: <a href="http://im4java.sourceforge.net/">im4java</a><br>
 * GraphicsMagick: <a href="ftp://ftp.graphicsmagick.org/pub/GraphicsMagick/windows/">下载</a><br>
 *
 * @author xiaofei.xian
 * @version
 *          1.0, 2016年8月8日 下午2:53:20
 */
public class GraphicsMagicUtil {

	private static Logger logger = LoggerFactory.getLogger(MongoFileServiceImp.class);

	private static String GRAPHICS_MAGICK_PATH;

	private static boolean IS_WINDOWS;

	/**
	 * 缩放图片大小
	 *
	 * @throws IM4JavaException
	 * @throws InterruptedException
	 * @throws IOException
	 * @return
	 */
	public static OutputStream zoomPic(OutputStream os, InputStream is, String contentType, Integer width, Integer height)
			throws IOException, InterruptedException, IM4JavaException {
		IMOperation op = buildIMOperation(contentType, width, height);

		Pipe pipeIn = new Pipe(is, null);
		Pipe pipeOut = new Pipe(null, os);

		ConvertCmd cmd = new ConvertCmd(true);
		if (IS_WINDOWS) {
			// linux下不要设置此值，不然会报错
			cmd.setSearchPath(GRAPHICS_MAGICK_PATH);
		}
		cmd.setInputProvider(pipeIn);
		cmd.setOutputConsumer(pipeOut);
		cmd.run(op);
		return os;
	}

	/**
	 * 压缩图片，返回输入流
	 *
	 * @param is
	 * @param contentType
	 * @param width
	 * @param height
	 * @return
	 */
	public static InputStream convertThumbnailImage(InputStream is, String contentType, double width, double height) {
		try {
			IMOperation op = buildIMOperation(contentType, width, height);

			Pipe pipeIn = new Pipe(is, null);
			ByteArrayOutputStream os = new ByteArrayOutputStream();
			Pipe pipeOut = new Pipe(null, os);

			ConvertCmd cmd = new ConvertCmd(true);
			if (IS_WINDOWS) {
				// linux下不要设置此值，不然会报错
				cmd.setSearchPath(GRAPHICS_MAGICK_PATH);
			}
			cmd.setInputProvider(pipeIn);
			cmd.setOutputConsumer(pipeOut);
			cmd.run(op);
			return new ByteArrayInputStream(os.toByteArray());
		} catch (Exception e) {
			if (logger.isInfoEnabled()) {
				logger.info("Failed to convert image {}", e.getMessage());
			}
			return null;
		}
	}

	/**
	 * @param contentType
	 * @param width
	 * @param height
	 * @return
	 */
	private static IMOperation buildIMOperation(String contentType, Number width, Number height) {
		IMOperation op = new IMOperation();

		String widHeight = width + "x" + height;
		op.addImage("-"); // 命令：处输入流中读取图片
		op.addRawArgs("-scale", widHeight);// 按照给定比例缩放图片
		op.addRawArgs("-gravity", "center"); // 缩放参考位置 对图像进行定位
		op.addRawArgs("-extent", width + "x" + height); // 限制JPEG文件的最大尺寸
		op.addRawArgs("+profile", "*");// 去除Exif信息

		// 设置图片压缩格式
		op.addImage(contentType.substring(contentType.indexOf("/") + 1) + ":-");
		return op;
	}

	public static void setGraphicsMagickPath(String graphicsMagickPath) {
		GraphicsMagicUtil.GRAPHICS_MAGICK_PATH = graphicsMagickPath;
		IS_WINDOWS = SystemUtils.IS_OS_WINDOWS;
	}

}