在Tiff的getImageWritersByFormatName中出现问题。获得图像编写者 [英] Issue in getImageWritersByFormatName for Tiff. Getting image writer

问题描述

我正在尝试将PDF转换为tif图像。我使用以下代码按格式获取图像编写器。

I am trying to convert PDF to tif images. I use following code to get the image writers by format.

Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("TIFF");

        if (writers == null || !writers.hasNext()) {
            throw new ImageWritingException();
        }

当我在Eclipse中独立运行应用程序时，这很好用。但是当我将应用程序部署到linux中的tomcat服务器时， writers == null 为false，但！writers.hasNext 为true，导致抛出异常。

This works fine when I run the application standalone in Eclipse. But when I deploy the application to tomcat server in linux, writers==null is false but !writers.hasNext is true resulting to throw Exception.

我使用maven来构建战争项目。

I use maven to build the project to war.

我在pom文件中有以下依赖项。

I have following dependencies in the pom file.

<dependency>
            <groupId>org.icepdf</groupId>
            <artifactId>icepdf-core</artifactId>
        </dependency>

        <dependency>
            <groupId>com.sun.media</groupId>
            <artifactId>jai_imageio</artifactId>
        </dependency>

        <dependency>
            <groupId>com.sun.media</groupId>
            <artifactId>jai-codec</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.media</groupId>
            <artifactId>jai_core</artifactId>
        </dependency>

两种环境之间有什么区别？我该如何解决这个问题？

What can be the difference between two environments? How can I fix this issue?

推荐答案

Tiff支持由Java Advanced Imaging插件提供 jai_core.jar 。

Tiff support is provided by the Java Advanced Imaging plugin jai_core.jar.

为了正常工作，需要将jar文件添加到JVM的 ext 目录中，否则它将无法正确注册

In order to work correctly, the jar file needs to be added to the JVM's ext directory, otherwise it won't register properly

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