java – 使用Apache Batik将SVG图像转换为JPEG图像

public void saveAsjpeg() throws Exception {

    // Create a JPEG transcoder
    JPEGTranscoder t = new JPEGTranscoder();

    // Set the transcoding hints.
    t.addTranscodingHint(JPEGTranscoder.KEY_QUALITY,new Float(.8));

    // Create the transcoder input.
    String svgURI = new File(inputFilePath).toURL().toString();
    TranscoderInput input = new TranscoderInput(svgURI);

    // Create the transcoder output.
    OutputStream ostream = new FileOutputStream(outputFilePath);
    TranscoderOutput output = new TranscoderOutput(ostream);

    // Save the image.
    t.transcode(input,output);

    // Flush and close the stream.
    ostream.flush();
    ostream.close();
    System.exit(0);
}

下面是我的pom.xml.我正在尝试春季启动项目：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.4.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-transcoder</artifactId>
            <version>1.8</version>
        </dependency>

        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-codec</artifactId>
            <version>1.8</version>
        </dependency>

        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-svgpp</artifactId>
            <version>1.8</version>
        </dependency>

        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-rasterizer</artifactId>
            <version>1.8</version>
        </dependency>

        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-squiggle</artifactId>
            <version>1.8</version>
        </dependency>

        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>xmlgraphics-commons</artifactId>
            <version>2.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-ttf2svg</artifactId>
            <version>1.8</version>
        </dependency>


    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-source-plugin</artifactId>
                <executions>
                    <execution>
                        <id>attach-sources</id>
                        <goals>
                            <goal>jar</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-javadoc-plugin</artifactId>
                <executions>
                    <execution>
                        <id>attach-javadocs</id>
                        <goals>
                            <goal>jar</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>


</project>

我得到以下异常：

org.apache.batik.transcoder.TranscoderException: null
Enclosed Exception:
null
    at org.apache.batik.transcoder.image.ImageTranscoder.transcode(Unknown Source)
    at org.apache.batik.transcoder.XMLAbstractTranscoder.transcode(Unknown Source)
    at org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(Unknown Source)
    at SaveToJPEG.saveAsjpeg(SaveToJPEG.java:31)
    at SaveToJPEG.main(SaveToJPEG.java:42)

我在这里有几个问题：

>为什么异常堆栈跟踪显示“未知来源”并且异常是如此无法提供信息？我在Google上搜索并了解如果罐子上没有附加源,那么例外可能没有信息.我已将插件代码放在pom中以添加源代码.但这不起作用.
>为了不将svg图像转换为jpeg,蜡染代码有什么问题？