我对 BIRT 和 XML 还很陌生，但正在尝试解决性能问题。现在我们有一个报告使用一个大的 XML 文件作为数据源，并且加载时间很长。所以我一直在探索不同的选择。我发现您可以使用脚本数据源并使用 java 来解析 XML。
我的问题是，即使 XML 文件中有信息，它也会将某些行留空。
我有一个测试 XML 文件，如下所示:
<?xml version="1.0"?>
<library>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author name="Giada De Laurentiis" country="it"/>
<year>2005</year>
<info>asdfghjkl</info>
</book>
<book category="CHILDREN">
<title lang="en">Harry Potter</title>
<author name="J K. Rowling" country="uk" />
<year>2005</year>
<info>asdfghjkl</info>
</book>
<book category="WEB">
<title lang="en">XQuery Kick Start</title>
<author name="James McGovern" country="us" />
<author name="Per Bothner" country="us" />
<info>asdfghjkl</info>
</book>
<book category="WEB">
<title lang="en">Learning XML</title>
<author name="Erik T. Ray" country="us" />
<year>2003</year>
<info>asdfghjkl</info>
</book>
</library>
在我打开的数据集中，我有
importPackage(javax.xml.parsers);
importPackage(javax.xml.xpath);
importPackage(org.w3c.dom);
importPackage(org.xml.sax);
var factory = DocumentBuilderFactory.newInstance();
var builder = null;
doc = null;
var expr = null;
factory.setNamespaceAware(true);
builder = factory.newDocumentBuilder();
doc = builder.parse(params["FileName"].value);
doc.getDocumentElement().normalize();
// create an XPathFactory
var xFactory = XPathFactory.newInstance();
// create an XPath object
xpath = xFactory.newXPath();
// compile the XPath expression
expr = xpath.compile("/library/*");
// run the query and get a nodeset
var result = expr.evaluate(doc, XPathConstants.NODESET);
//initialize object variables to be used in the fetch method
nodes = result;
x = 0;
y = 0;
cnt = nodes.getLength();
在获取下我有
var lboolAllowed = false;
if (x < cnt)
{
var nodeList = nodes.item(x).getChildNodes();
var nodeListLength = nodes.item(x).getChildNodes().getLength();
for(var i=0; i<nodeListLength; i++)
{
var nodeName = nodeList.item(i).getNodeName();
var nodeText = nodeList.item(i).getTextContent();
if(nodeName == "category")
{
row["category"] = nodeText;
}
if(nodeName == "year")
{
row["year"] = nodeText;
}
else if(nodeName == "info")
{
row["info"] = nodeText;
}
else if(nodeName == "title")
{
row["title"] = nodeText;
}
else if(nodeName == "author")
{
row["author"] = nodeText;
}
else if(nodeName == "country")
{
row["country"] = nodeText;
}
y++
}
x++;
y=0;
return (true);
}
return (false);
然后我有一个名为 FileName 的报告参数，它指向 XML 文件的位置。 空白的行是类别、作者和国家/地区。我使用的是3.2.23版本。 如果有帮助的话，这是报告中的 XML 源。
<?xml version="1.0" encoding="UTF-8"?>
<report xmlns="http://www.eclipse.org/birt/2005/design" version="3.2.23" id="1">
<property name="createdBy">Eclipse BIRT Designer Version 4.6.0.v201606072122</property>
<property name="units">in</property>
<property name="iconFile">/templates/blank_report.gif</property>
<property name="bidiLayoutOrientation">ltr</property>
<property name="imageDPI">120</property>
<parameters>
<scalar-parameter name="FileName" id="11">
<property name="hidden">true</property>
<property name="valueType">static</property>
<property name="dataType">string</property>
<property name="distinct">true</property>
<simple-property-list name="defaultValue">
<value type="constant">C:\Users\1122335\Desktop\Workspace\test\new207.xml</value>
</simple-property-list>
<list-property name="selectionList"/>
<property name="paramType">simple</property>
<property name="controlType">text-box</property>
<structure name="format">
<property name="category">Unformatted</property>
</structure>
</scalar-parameter>
</parameters>
<data-sources>
<script-data-source name="Data Source" id="9"/>
</data-sources>
<data-sets>
<script-data-set name="Data Set" id="12">
<list-property name="resultSetHints">
<structure>
<property name="position">1</property>
<property name="name">year</property>
<property name="dataType">integer</property>
</structure>
<structure>
<property name="position">2</property>
<property name="name">info</property>
<property name="dataType">string</property>
</structure>
<structure>
<property name="position">3</property>
<property name="name">category</property>
<property name="dataType">string</property>
</structure>
<structure>
<property name="position">4</property>
<property name="name">title</property>
<property name="dataType">string</property>
</structure>
<structure>
<property name="position">5</property>
<property name="name">author</property>
<property name="dataType">string</property>
</structure>
<structure>
<property name="position">6</property>
<property name="name">country</property>
<property name="dataType">string</property>
</structure>
</list-property>
<list-property name="columnHints">
<structure>
<property name="columnName">year</property>
<text-property name="displayName">year</text-property>
</structure>
<structure>
<property name="columnName">info</property>
<text-property name="displayName">info</text-property>
</structure>
<structure>
<property name="columnName">category</property>
<text-property name="displayName">category</text-property>
</structure>
<structure>
<property name="columnName">title</property>
<text-property name="displayName">title</text-property>
</structure>
<structure>
<property name="columnName">author</property>
<text-property name="displayName">author</text-property>
</structure>
<structure>
<property name="columnName">country</property>
<text-property name="displayName">country</text-property>
</structure>
</list-property>
<structure name="cachedMetaData">
<list-property name="resultSet">
<structure>
<property name="position">1</property>
<property name="name">year</property>
<property name="dataType">integer</property>
</structure>
<structure>
<property name="position">2</property>
<property name="name">info</property>
<property name="dataType">string</property>
</structure>
<structure>
<property name="position">3</property>
<property name="name">category</property>
<property name="dataType">string</property>
</structure>
<structure>
<property name="position">4</property>
<property name="name">title</property>
<property name="dataType">string</property>
</structure>
<structure>
<property name="position">5</property>
<property name="name">author</property>
<property name="dataType">string</property>
</structure>
<structure>
<property name="position">6</property>
<property name="name">country</property>
<property name="dataType">string</property>
</structure>
</list-property>
</structure>
<property name="dataSource">Data Source</property>
<method name="open"><![CDATA[importPackage(javax.xml.parsers);
importPackage(javax.xml.xpath);
importPackage(org.w3c.dom);
importPackage(org.xml.sax);
var factory = DocumentBuilderFactory.newInstance();
var builder = null;
doc = null;
var expr = null;
factory.setNamespaceAware(true);
builder = factory.newDocumentBuilder();
//doc = builder.parse("C:\Users\1122335\Desktop\Workspace\test\new207.xml");
doc = builder.parse(params["FileName"].value);
doc.getDocumentElement().normalize();
// create an XPathFactory
var xFactory = XPathFactory.newInstance();
// create an XPath object
xpath = xFactory.newXPath();
// compile the XPath expression
expr = xpath.compile("/library/*");
// run the query and get a nodeset
var result = expr.evaluate(doc, XPathConstants.NODESET);
//initialize object variables to be used in the fetch method
nodes = result;
x = 0;
y = 0;
cnt = nodes.getLength();
]]></method>
<method name="fetch"><![CDATA[var lboolAllowed = false;
if (x < cnt)
{
var nodeList = nodes.item(x).getChildNodes();
var nodeListLength = nodes.item(x).getChildNodes().getLength();
for(var i=0; i<nodeListLength; i++)
{
var nodeName = nodeList.item(i).getNodeName();
var nodeText = nodeList.item(i).getTextContent();
if(nodeName == "@category")
{
row["category"] = nodeText;
}
if(nodeName == "year")
{
row["year"] = nodeText;
}
else if(nodeName == "info")
{
row["info"] = nodeText;
}
else if(nodeName == "//title")
{
row["title"] = nodeText;
}
else if(nodeName == "//author")
{
row["author"] = nodeText;
}
else if(nodeName == "//country")
{
row["country"] = nodeText;
}
y++
}
x++;
y=0;
return (true);
}
return (false);]]></method>
<method name="close"><![CDATA[factory = null;
builder = null;
doc = null;
expr = null;
builder = null;
xFactory = null;
// create an XPath object
xpath = null;
result = null;
//initialize object variables to be used in the fetch method
nodes = null;
x = 0;
y = 0;
cnt = null;]]></method>
</script-data-set>
</data-sets>
<page-setup>
<simple-master-page name="Simple MasterPage" id="2">
<page-footer>
<text id="3">
<property name="contentType">html</property>
<text-property name="content"><![CDATA[<value-of>new Date()</value-of>]]></text-property>
</text>
</page-footer>
</simple-master-page>
</page-setup>
<body>
<table id="356">
<property name="dataSet">Data Set</property>
<list-property name="boundDataColumns">
<structure>
<property name="name">year</property>
<text-property name="displayName">year</text-property>
<expression name="expression" type="javascript">dataSetRow["year"]</expression>
<property name="dataType">integer</property>
</structure>
<structure>
<property name="name">info</property>
<text-property name="displayName">info</text-property>
<expression name="expression" type="javascript">dataSetRow["info"]</expression>
<property name="dataType">string</property>
</structure>
<structure>
<property name="name">category</property>
<text-property name="displayName">category</text-property>
<expression name="expression" type="javascript">dataSetRow["category"]</expression>
<property name="dataType">string</property>
</structure>
<structure>
<property name="name">title</property>
<text-property name="displayName">title</text-property>
<expression name="expression" type="javascript">dataSetRow["title"]</expression>
<property name="dataType">string</property>
</structure>
<structure>
<property name="name">author</property>
<text-property name="displayName">author</text-property>
<expression name="expression" type="javascript">dataSetRow["author"]</expression>
<property name="dataType">string</property>
</structure>
<structure>
<property name="name">country</property>
<text-property name="displayName">country</text-property>
<expression name="expression" type="javascript">dataSetRow["country"]</expression>
<property name="dataType">string</property>
</structure>
</list-property>
<column id="390"/>
<column id="391"/>
<column id="392"/>
<column id="393"/>
<column id="394"/>
<column id="395"/>
<header>
<row id="357">
<cell id="358">
<label id="359">
<text-property name="text">year</text-property>
</label>
</cell>
<cell id="360">
<label id="361">
<text-property name="text">info</text-property>
</label>
</cell>
<cell id="362">
<label id="363">
<text-property name="text">category</text-property>
</label>
</cell>
<cell id="364">
<label id="365">
<text-property name="text">title</text-property>
</label>
</cell>
<cell id="366">
<label id="367">
<text-property name="text">author</text-property>
</label>
</cell>
<cell id="368">
<label id="369">
<text-property name="text">country</text-property>
</label>
</cell>
</row>
</header>
<detail>
<row id="370">
<cell id="371">
<data id="372">
<property name="resultSetColumn">year</property>
</data>
</cell>
<cell id="373">
<data id="374">
<property name="resultSetColumn">info</property>
</data>
</cell>
<cell id="375">
<data id="376">
<property name="resultSetColumn">category</property>
</data>
</cell>
<cell id="377">
<data id="378">
<property name="resultSetColumn">title</property>
</data>
</cell>
<cell id="379">
<data id="380">
<property name="resultSetColumn">author</property>
</data>
</cell>
<cell id="381">
<data id="382">
<property name="resultSetColumn">country</property>
</data>
</cell>
</row>
</detail>
<footer>
<row id="383">
<cell id="384"/>
<cell id="385"/>
<cell id="386"/>
<cell id="387"/>
<cell id="388"/>
<cell id="389"/>
</row>
</footer>
</table>
</body>
</report>
最佳答案
这是一个与 XML/DOM 相关的问题:nodeName 没有 @ 或 // 作为前缀(这是 XPath 的东西)，但是只是元素或属性名称，所以不是 @category 而只是 category，将它们删除
if(nodeName == "@category")
和
else if(nodeName == "//author")
{
row["author"] = nodeText;
}
else if(nodeName == "//country")
{
row["country"] = nodeText;
}
DOM Node中的表格javadoc 显示 Node.getNodeName()
另外你查询category/author/country的节点有误，参见:
var book = nodes.item(x);
var nodeList = book.getChildNodes();
var nodeListLength = nodeList.getLength();
row["category"] = book.getAttribute("category");
for(int i=0; i<nodeListLength; i++)
{
var child = nodeList.item(i);
var nodeName = child.getNodeName();
var nodeText = child.getTextContent();
if(nodeName == "year")
{
row["year"] = nodeText);
}
else if(nodeName == "info")
{
row["info"] = nodeText);
}
else if(nodeName == "title")
{
row["title"] = nodeText);
}
else if(nodeName == "author")
{
row["author"] = child.getAttribute("name");
row["country"] = child.getAttribute("country");
}
注意:作者实际上是一个列表
关于java - 使用 BIRT 解析 XML，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59143564/