Digester解释xml 两种rule方式

Digester解释xml 两种rule方式

文章转自：http://gaolixu.iteye.com/blog/421717

java 代码：

 

ChartRegistry：
public class ChartRegistry
{
    List<ChartConfig> registry = new ArrayList<ChartConfig>();
    public void addChart(ChartConfig obj)
    {
        registry.add(obj);
    }
    
    public java.util.List<ChartConfig> getRegistry()
    {
        return registry;
    }

    public String toString() {
        return ReflectionToStringBuilder.reflectionToString(this,

ToStringStyle.MULTI_LINE_STYLE);
    }
}

 

图表设定器ChartConfig：
public class ChartConfig implements Comparable
{
    private String id;
    private boolean legendVisible;
    private String type;
    private int width;
    private String description;

    public String getDescription()
    {
        return description;
    }
    public void setDescription(String description)
    {
        this.description = description;
    }
    public String getId()
    {
        return id;
    }
    public void setId(String id)
    {
        this.id = id;
    }
    public boolean isLegendVisible()
    {
        return legendVisible;
    }
    public void setLegendVisible(boolean legendVisible)
    {
        this.legendVisible = legendVisible;
    }
    public String getType()
    {
        return type;
    }
    public void setType(String type)
    {
        this.type = type;
    }
    public int getWidth()
    {
        return width;
    }
    public void setWidth(int width)
    {
        this.width = width;
    }
    public String toString() {
        return ReflectionToStringBuilder.reflectionToString

(this,ToStringStyle.MULTI_LINE_STYLE);
    }
    public int compareTo(Object o)
    {
        if(o instanceof ChartConfig){
            ChartConfig o1 = (ChartConfig)o;
            return this.id.compareTo(o1.id);
        }
        return -1;
    }
}

 

图表数据设定（简化版）charts.xml：
<?xml version="1.0" encoding="GBK" ?>
<charts>
    <chart id="BarChart1">
        <legendVisible>false</legendVisible>
        <type>中国</type>
        <width>500</width>
        <description>11</description>
    </chart>
    <chart id="BarChart2">
        <legendVisible>true</legendVisible>
        <type>美国</type>
        <width>500</width>
        <description>22</description>
    </chart>
</charts>

 

配置规则设定rule.xml：
<?xml version='1.0'?>
<!DOCTYPE digester-rules
  PUBLIC "-//Jakarta Apache //DTD digester-rules XML V1.0//EN"
    "file:///../digester/dtds/digester-rules.dtd">

<digester-rules>
    <pattern value="charts">  <!-- 遇上charts节点时 -->
        <object-create-rule classname="study.jakarta.commons.digester.ChartRegistry" />  

<!-- 创建对象 -->
        <set-properties-rule /> <!-- 设置属性 -->
        <pattern value="chart"> <!-- 遇上charts节点时 -->
            <object-create-rule classname="study.jakarta.commons.digester.ChartConfig" />

<!-- 创建对象 -->
            <set-next-rule methodname="addChart"

paramtype="study.jakarta.commons.digester.ChartConfig"/> <!-- 调用定对象方法 -->
            <set-properties-rule /> <!-- 设置属性 -->
            <bean-property-setter-rule pattern="legendVisible" /> <!-- 调用对象的setter方

法 -->
            <bean-property-setter-rule pattern="type" />
            <bean-property-setter-rule pattern="width" />
            <bean-property-setter-rule pattern="description" />
        </pattern>
    </pattern>
</digester-rules>

 

跑一下试试看：
public class DigesterTest
{
    public static void main(String[] args)
    {
        try
        {
            String charts = "F:\\计算机\\jakarta-commons\\jakarta-commons-cookbook-code\

\examples\\study\\jakarta\\commons\\digester\\charts.xml";
            String rule="F:\\计算机\\jakarta-commons\\jakarta-commons-cookbook-code\

\examples\\study\\jakarta\\commons\\digester\\rules.xml";
            DigesterTest test= new DigesterTest();
            System.out.println("======================= getChartRegistryWithCodeRule

==========================");
            ChartRegistry c= test.getChartRegistryWithCodeRule(new File(charts));
            System.out.println(c);
            System.out.println("======================= getChartRegistryWithCodeRule

==========================");
            System.out.println(test.getChartRegistryWithFileRule(new File(charts),new

File(rule)));
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
    
    //代码中设定规则
    private ChartRegistry getChartRegistryWithCodeRule(File charts) throws IOException,

SAXException{
        
                InputStream is = new FileInputStream(charts);
                Digester digester = new Digester();
                digester.setValidating(false);//不进行XML与相应的DTD的合法性验证
                
                digester.push(new ChartRegistry());                         //创建一个

ChartRegistry对象, 你这样用这种形式建立顶对象（选用这种方式，注释下一行）
                //digester.addObjectCreate("charts", ChartRegistry.class);  //创建一个

ChartRegistry对象, 你也这样用这种形式建立顶对象（选用这种方式，注释上一行）
                digester.addSetProperties("charts");
                digester.addObjectCreate("charts/chart", ChartConfig.class); //当遇到

<chart>时创建一个ChartConfig对象
                digester.addSetProperties("charts/chart");  //根据<chart>元素的属性

(attribute)，对刚创建的ChartConfig对象的属性(property)进行设置
                digester.addBeanPropertySetter("charts/chart/legendVisible");//当遇到

<chart>的子元素<legendVisible>时将子元素值设置为ChartConfig对象的legendVisible属性的setter

方法
                digester.addBeanPropertySetter("charts/chart/type");        //参考上面注释
                digester.addBeanPropertySetter("charts/chart/width");        //参考上面注

释
                digester.addBeanPropertySetter("charts/chart/description"); //参考上面注释
                digester.addSetNext("charts/chart", "addChart");        //当再次遇到

<charts>的子元素<chart>时调用顶对象的addChart方法。
                ChartRegistry c = (ChartRegistry)digester.parse(is);  //分析结束后，返回根

元素
                Collections.sort(c.getRegistry());
                return c;
    }
    
    //配置中设定规则
    private ChartRegistry getChartRegistryWithFileRule(File charts,File rule) throws

IOException, SAXException{
            Digester digester = DigesterLoader.createDigester(rule.toURL());
            ChartRegistry c = (ChartRegistry)digester.parse(charts);
            Collections.sort(c.getRegistry());
            return c;
    }
}

 

结果输出：
======================= getChartRegistryWithCodeRule ==========================
study.jakarta.commons.digester.ChartRegistry@16df84b[
  registry=[study.jakarta.commons.digester.ChartConfig@1aa57fb[
  id=BarChart1
  legendVisible=false
  type=中国
  width=500
  description=11
], study.jakarta.commons.digester.ChartConfig@763f5d[
  id=BarChart2
  legendVisible=true
  type=美国
  width=500
  description=22
]]
]
======================= getChartRegistryWithCodeRule ==========================
study.jakarta.commons.digester.ChartRegistry@18f6235[
  registry=[study.jakarta.commons.digester.ChartConfig@78a212[
  id=BarChart1
  legendVisible=false
  type=中国
  width=500
  description=11
], study.jakarta.commons.digester.ChartConfig@1d85f79[
  id=BarChart2
  legendVisible=true
  type=美国
  width=500
  description=22
]]
]