im4java+GraphicsMagick

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;

    }

}