【问题标题】:Unable to load library 'gs' with Ghost4J无法使用 Ghost4J 加载库“gs”
【发布时间】:2015-11-06 22:10:12
【问题描述】:

我正在尝试使用 Ghost4J 将 PDF 转换为 PNG。我知道以前有人问过这个问题,但在 OS X 10 和最新版本的 Ghost4J 中都没有。

我已按照此处的 zippy1978 答案中列出的说明进行操作:PDF to image using Java

我已经关注了Ghost4J page中的所有内容

我也从这里尝试了这两个答案:How can i use ghost4j on OS X 10.9

我已经用Port 安装了Ghostscript,并从Richard Koch's website 尝试过。

我继续收到此错误:

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler processing failed; nested exception is java.lang.UnsatisfiedLinkError: Unable to load library 'gs': dlopen(libgs.dylib, 9): image not found] with root cause

java.lang.UnsatisfiedLinkError: Unable to load library 'gs': dlopen(libgs.dylib, 9): image not found
    at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:166)
    at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:239)
    at com.sun.jna.Library$Handler.<init>(Library.java:140)
    at com.sun.jna.Native.loadLibrary(Native.java:393)
    at com.sun.jna.Native.loadLibrary(Native.java:378)
    at org.ghost4j.GhostscriptLibraryLoader.loadLibrary(GhostscriptLibraryLoader.java:39)
    at org.ghost4j.GhostscriptLibrary.<clinit>(GhostscriptLibrary.java:34)
    at org.ghost4j.Ghostscript.initialize(Ghostscript.java:323)
    at org.ghost4j.renderer.SimpleRenderer.run(SimpleRenderer.java:105)
    at org.ghost4j.renderer.AbstractRemoteRenderer.render(AbstractRemoteRenderer.java:86)
    at org.ghost4j.renderer.AbstractRemoteRenderer.render(AbstractRemoteRenderer.java:70)
    at com.xxxx.yyyy.controller.rest.yyyyyController.zzzz(yyyyyController.java:182)

我在这里错过了什么?

我的控制器崩溃的代码是这样的(我标记了这一行):

// imgSrc is the PDF in Base 64 and output file is a File

byte[] imageByte;
BASE64Decoder decoder = new BASE64Decoder();
imageByte = decoder.decodeBuffer(imgSrc);
outputfile = new File("image.pdf");
OutputStream fop = new FileOutputStream(outputfile);
fop.write(imageByte);
fop.flush();
fop.close();
PDFDocument document = new PDFDocument();
document.load(outputfile);
SimpleRenderer renderer = new SimpleRenderer();
renderer.setResolution(300);
List images = renderer.render(document);       //CRASH TAKES PLACE HERE ***
outputfile = new File("image.png");
ImageIO.write((RenderedImage) images.get(0), "png", outputfile);

【问题讨论】:

    标签: java ghostscript ghost4j


    【解决方案1】:

    所以我想通了!

    我在这个conversation找到了答案:

    我有同样的问题,虽然我已经安装了 macports 包 “鬼脚本”已经。设置 LD_LIBRARY_PATH 有帮助:

    $ export LD_LIBRARY_PATH=/opt/local/lib

    这导致了一条警告消息:

    log4j:WARN No appenders could be found for logger (slideselector.facedata.FaceDataParser).
    log4j:WARN Please initialize the log4j system properly.
    

    在以下人员的帮助下解决了这个问题:How to initialize log4j properly?

    对于所有像我这样的专家:将 log4j.properties 放入 src/main/资源

    【讨论】:

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