JFreeChart生成svg格式图片，response返回

最新推荐文章于 2022-11-30 01:30:34 发布

原创最新推荐文章于 2022-11-30 01:30:34 发布 · 1.2k 阅读

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本文介绍如何在Maven项目中利用JFreeChart库生成SVG格式的图表，并通过HTTP响应发送给客户端。

Maven依赖

 <!-- https://mvnrepository.com/artifact/batik/batik-dom -->
    <dependency>
      <groupId>batik</groupId>
      <artifactId>batik-dom</artifactId>
      <version>1.6</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/batik/batik-xml -->
    <dependency>
      <groupId>batik</groupId>
      <artifactId>batik-xml</artifactId>
      <version>1.6</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/batik/batik-util -->
    <dependency>
      <groupId>batik</groupId>
      <artifactId>batik-util</artifactId>
      <version>1.6</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/batik/batik-awt-util -->
    <dependency>
      <groupId>batik</groupId>
      <artifactId>batik-awt-util</artifactId>
      <version>1.6</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/batik/batik-svggen -->
    <dependency>
      <groupId>batik</groupId>
      <artifactId>batik-svggen</artifactId>
      <version>1.6</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/batik/batik-transcoder -->
    <dependency>
      <groupId>batik</groupId>
      <artifactId>batik-transcoder</artifactId>
      <version>1.6</version>
    </dependency>

导出方法

 private static void exportChartAsSVG(JFreeChart chart, int width,int height, HttpServletResponse response) throws IOException {
        // Get a DOMImplementation and create an XML document
        DOMImplementation domImpl =
                GenericDOMImplementation.getDOMImplementation();
        Document document = domImpl.createDocument(null, "svg", null);

        // Create an instance of the SVG Generator
        SVGGraphics2D svgGenerator = new SVGGraphics2D(document);
        Rectangle bounds = new Rectangle(0,0,width,height);
        // draw the chart in the SVG generator
        chart.draw(svgGenerator, bounds);

        // Write svg file
        OutputStream outputStream = response.getOutputStream();
        Writer out = new OutputStreamWriter(outputStream, "UTF-8");
        svgGenerator.stream(out, true);
        outputStream.flush();
        outputStream.close();
    }