im4java+GraphicsMagick

`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`

`* 代码实现类将图片装换压缩成固定的大小格式的图片`

`* 使用工具为im4java+GraphicsMagick-1.3.24-Q8`

`* 参考: im4java`

`* GraphicsMagick: 下载`

`*`

`* @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;`

`}`

`}`