Question

我正在寻找一种使用Java Apache FOP在XSLT中生成条形图的方法。

我正在尝试使用下面的XML和XSLT生成条形图，但是它会生成没有任何图表的空.PDF文件？

data.xml

<?xml version="1.0" encoding="UTF-8"?>
<sales>
 <region>
  <title>Eastern Region Quarterly Sales (Second/'04)</title>
  <key1 area="New York Area">.95</key1>
  <key2 area="Virginia Area">.89</key2>
  <key3 area="Maryland Area">.67</key3>
  <key4 area="Connecticut Area">.65</key4>
  <key5 area="Delaware Area">.45</key5>
 </region>
</sales>

bar.xsl

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="xml" indent="yes" />
    <xsl:template match="sales">
        <svg width="650" height="500">
            <g id="axis" transform="translate(0 500) scale(1 -1)">
                <line id="axis-y" x1="30" y1="20" x2="30" y2="450" style="fill:none;stroke:rgb(0,0,0);stroke-width:2" />
                <line id="axis-x" x1="30" y1="20" x2="460" y2="20" style="fill:none;stroke:rgb(0,0,0);stroke-width:2" />
            </g>
            <xsl:apply-templates select="region" />
        </svg>
    </xsl:template>
    <xsl:template match="region">
        <g id="bars" transform="translate(30 479) scale(1 -430)">
            <rect x="30" y="0" width="50" height="{key1}" style="fill:rgb(255,0,0);stroke:rgb(0,0,0);stroke-width:0" />
            <rect x="100" y="0" width="50" height="{key2}" style="fill:rgb(0,255,0);stroke:rgb(0,0,0);stroke-width:0" />
            <rect x="170" y="0" width="50" height="{key3}" style="fill:rgb(255,255,0);stroke:rgb(0,0,0);stroke-width:0" />
            <rect x="240" y="0" width="50" height="{key4}" style="fill:rgb(0,255,255);stroke:rgb(0,0,0);stroke-width:0" />
            <rect x="310" y="0" width="50" height="{key5}" style="fill:rgb(0,0,255);stroke:rgb(0,0,0);stroke-width:0" />
        </g>
        <g id="scale" transform="translate(29 60)">
            <text id="scale1" x="0px" y="320px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">$25K</text>
            <text id="scale2" x="0px" y="215px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">$50K</text>
            <text id="scale3" x="0px" y="107.5px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">$75K</text>
            <text id="scale4" x="0px" y="0px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">$100K</text>
        </g>
        <g id="key">
            <rect id="key1" x="430" y="80" width="25" height="15" style="fill:rgb(255,0,0);stroke:rgb(0,0,0);stroke-width:1" />
            <rect id="key2" x="430" y="100" width="25" height="15" style="fill:rgb(0,255,0);stroke:rgb(0,0,0);stroke-width:1" />
            <rect id="key3" x="430" y="120" width="25" height="15" style="fill:rgb(255,255,0);stroke:rgb(0,0,0);stroke-width:1" />
            <rect id="key5" x="430" y="140" width="25" height="15" style="fill:rgb(0,255,255);stroke:rgb(0,0,0);stroke-width:1" />
            <rect id="key4" x="430" y="160" width="25" height="15" style="fill:rgb(0,0,255);stroke:rgb(0,0,0);stroke-width:1" />
        </g>
        <text id="key1-text" x="465px" y="92px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">
            <xsl:value-of select="key1/@area" />
        </text>
        <text id="key2-text" x="465px" y="112px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">
            <xsl:value-of select="key2/@area" />
        </text>
        <text id="key3-text" x="465px" y="132px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">
            <xsl:value-of select="key3/@area" />
        </text>
        <text id="key4-text" x="465px" y="152px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">
            <xsl:value-of select="key4/@area" />
        </text>
        <text id="key5-text" x="465px" y="172px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">
            <xsl:value-of select="key5/@area" />
        </text>
        <g id="title">
            <text x="325px" y="20px" style="text-anchor:middle;fill:rgb(0,0,0);font-size:24;font-family:Arial">
                <xsl:value-of select="title" />
            </text>
        </g>
    </xsl:template>
</xsl:stylesheet>

我不确定为什么我会得到空的pdf，我也尝试生成svg文件-它也没有显示任何图形。任何帮助将不胜感激。

Answer 1

您可以使用fo:instream-foreign-object在XSL-FO中创建和嵌入SVG。

由于您要使用XSLT和FOP，因此我假设您具有XML的输入数据。（如果不是，也许XSLT和FOP不是适合该工作的工具？）

因此，XSLT将从您的XML输入创建XSL-FO和嵌入式SVG。 FOP将从XSL-FO创建PDF。

示例...

XML输入

<list>
    <fruit>
        <type>Apples</type>
        <qty>5</qty>
    </fruit>
    <fruit>
        <type>Oranges</type>
        <qty>2</qty>
    </fruit>
    <fruit>
        <type>Bananas</type>
        <qty>7</qty>
    </fruit>
    <fruit>
        <type>Peaches</type>
        <qty>9</qty>
    </fruit>
</list>

XSLT 1.0

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
  xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <xsl:output indent="yes"/>
  <xsl:strip-space elements="*"/>

  <xsl:template match="/">
    <fo:root>
      <fo:layout-master-set>
        <fo:simple-page-master master-name="my-page" page-width="8.5in" page-height="11in">
          <fo:region-body margin="1in" margin-top="1.5in" margin-bottom="1.5in"/>
        </fo:simple-page-master>
      </fo:layout-master-set>
      <fo:page-sequence master-reference="my-page">
        <fo:flow flow-name="xsl-region-body">
          <xsl:apply-templates/>
        </fo:flow>
      </fo:page-sequence>
    </fo:root>
  </xsl:template>

  <xsl:template match="list">
    <fo:block>Example embedded SVG:</fo:block>
    <fo:block space-before="4pt">
      <fo:instream-foreign-object>
        <svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="420" height="150">
          <title id="title">List of Fruit</title>
          <xsl:apply-templates select="fruit">
            <xsl:sort select="type" order="ascending" data-type="text"/>
          </xsl:apply-templates>
        </svg>
      </fo:instream-foreign-object>
    </fo:block>
  </xsl:template>

  <xsl:template match="fruit">
    <xsl:variable name="y" select="((position() - 1) * 20) + (position() * 5 - 5)"/>
    <g xmlns="http://www.w3.org/2000/svg">
      <rect width="{qty * 10}" height="20" y="{$y}"/>
      <text x="100" y="{$y + 10}" dy=".35em">
        <xsl:value-of select="concat(qty,' ',type)"/>
      </text>
    </g>    
  </xsl:template>

</xsl:stylesheet>

XSL-FO输出

<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
   <fo:layout-master-set>
      <fo:simple-page-master master-name="my-page" page-width="8.5in" page-height="11in">
         <fo:region-body margin="1in" margin-top="1.5in" margin-bottom="1.5in"/>
      </fo:simple-page-master>
   </fo:layout-master-set>
   <fo:page-sequence master-reference="my-page">
      <fo:flow flow-name="xsl-region-body">
         <fo:block>Example embedded SVG:</fo:block>
         <fo:block space-before="4pt">
            <fo:instream-foreign-object>
               <svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="420" height="150">
                  <title id="title">List of Fruit</title>
                  <g>
                     <rect width="50" height="20" y="0"/>
                     <text x="100" y="10" dy=".35em">5 Apples</text>
                  </g>
                  <g>
                     <rect width="70" height="20" y="25"/>
                     <text x="100" y="35" dy=".35em">7 Bananas</text>
                  </g>
                  <g>
                     <rect width="20" height="20" y="50"/>
                     <text x="100" y="60" dy=".35em">2 Oranges</text>
                  </g>
                  <g>
                     <rect width="90" height="20" y="75"/>
                     <text x="100" y="85" dy=".35em">9 Peaches</text>
                  </g>
               </svg>
            </fo:instream-foreign-object>
         </fo:block>
      </fo:flow>
   </fo:page-sequence>
</fo:root>

呈现的PDF将是一个8.5“ x 11”的页面，其中包含以下内容：

注意：

我用Saxon-HE进行XSLT转换。 Saxon是XSLT 3.0处理器，因此，如果您决定使用它，就不会受到XSLT 1.0的限制。我仅使用XSLT 1.0，因为这是一个非常基本的示例。
我使用FOP 2.1版（oXygen XML编辑器随附）处理XSL-FO以创建PDF输出。

根据修改后的问题更新了XSLT：

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
  xmlns="http://www.w3.org/2000/svg">
  <xsl:output method="xml" indent="yes" />

  <xsl:template match="/">
    <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
      <fo:layout-master-set>
        <fo:simple-page-master master-name="my-page" page-width="8.5in" page-height="11in">
          <fo:region-body margin="1in" margin-top="1.5in" margin-bottom="1.5in"/>
        </fo:simple-page-master>
      </fo:layout-master-set>
      <fo:page-sequence master-reference="my-page">
        <fo:flow flow-name="xsl-region-body"> 
          <fo:block>
            <fo:instream-foreign-object>
              <xsl:apply-templates/>
            </fo:instream-foreign-object>
          </fo:block>
        </fo:flow>
      </fo:page-sequence>
    </fo:root>
  </xsl:template>

  <xsl:template match="sales">
    <svg width="650" height="500">
      <g id="axis" transform="translate(0 500) scale(1 -1)">
        <line id="axis-y" x1="30" y1="20" x2="30" y2="450" style="fill:none;stroke:rgb(0,0,0);stroke-width:2" />
        <line id="axis-x" x1="30" y1="20" x2="460" y2="20" style="fill:none;stroke:rgb(0,0,0);stroke-width:2" />
      </g>
      <xsl:apply-templates select="region" />
    </svg>
  </xsl:template>
  <xsl:template match="region">
    <g id="bars" transform="translate(30 479) scale(1 -430)">
      <rect x="30" y="0" width="50" height="{key1}" style="fill:rgb(255,0,0);stroke:rgb(0,0,0);stroke-width:0" />
      <rect x="100" y="0" width="50" height="{key2}" style="fill:rgb(0,255,0);stroke:rgb(0,0,0);stroke-width:0" />
      <rect x="170" y="0" width="50" height="{key3}" style="fill:rgb(255,255,0);stroke:rgb(0,0,0);stroke-width:0" />
      <rect x="240" y="0" width="50" height="{key4}" style="fill:rgb(0,255,255);stroke:rgb(0,0,0);stroke-width:0" />
      <rect x="310" y="0" width="50" height="{key5}" style="fill:rgb(0,0,255);stroke:rgb(0,0,0);stroke-width:0" />
    </g>
    <g id="scale" transform="translate(29 60)">
      <text id="scale1" x="0px" y="320px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">$25K</text>
      <text id="scale2" x="0px" y="215px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">$50K</text>
      <text id="scale3" x="0px" y="107.5px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">$75K</text>
      <text id="scale4" x="0px" y="0px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">$100K</text>
    </g>
    <g id="key">
      <rect id="key1" x="430" y="80" width="25" height="15" style="fill:rgb(255,0,0);stroke:rgb(0,0,0);stroke-width:1" />
      <rect id="key2" x="430" y="100" width="25" height="15" style="fill:rgb(0,255,0);stroke:rgb(0,0,0);stroke-width:1" />
      <rect id="key3" x="430" y="120" width="25" height="15" style="fill:rgb(255,255,0);stroke:rgb(0,0,0);stroke-width:1" />
      <rect id="key5" x="430" y="140" width="25" height="15" style="fill:rgb(0,255,255);stroke:rgb(0,0,0);stroke-width:1" />
      <rect id="key4" x="430" y="160" width="25" height="15" style="fill:rgb(0,0,255);stroke:rgb(0,0,0);stroke-width:1" />
    </g>
    <text id="key1-text" x="465px" y="92px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">
      <xsl:value-of select="key1/@area" />
    </text>
    <text id="key2-text" x="465px" y="112px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">
      <xsl:value-of select="key2/@area" />
    </text>
    <text id="key3-text" x="465px" y="132px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">
      <xsl:value-of select="key3/@area" />
    </text>
    <text id="key4-text" x="465px" y="152px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">
      <xsl:value-of select="key4/@area" />
    </text>
    <text id="key5-text" x="465px" y="172px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">
      <xsl:value-of select="key5/@area" />
    </text>
    <g id="title">
      <text x="325px" y="20px" style="text-anchor:middle;fill:rgb(0,0,0);font-size:24;font-family:Arial">
        <xsl:value-of select="title" />
      </text>
    </g>
  </xsl:template>
</xsl:stylesheet>

PDF输出

如何使用XSLT和Apache FOP在PDF文档中生成条形图

1 个答案: