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今日笔记系列之Castor

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近日对java对象与xml文本的相互转换有一定兴趣,于是乎在网上查看了一下相关的资料。发现了castor。

并浏览了该页面http://www.jdon.com/idea/castor.htm,但发现上面的代码有一些错漏。

自己用eclipse写了一个简单的代码如下:(主要参考了上面提到的网站的内容)

该程序是读入page.xml文件,然后转化为java对象。接着把java对象写到另外一个文件里。

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1.page.xml,要被转化为对象的页面

<?xml version="1.0" encoding="UTF-8"?><homepagecollection name="this is sample">   <!-- 对应Homepagecollection类  --> <homepagecontent id="1">   <!-- 对应Homepagecontent 类  -->  <name>About Us</name>  <navlink>1.jsp</navlink>  <icon>images/icon.gif</icon>  <description>An in-depth look at creating applications with XML.</description> </homepagecontent> <homepagecontent id="2">   <!-- 对应Homepagecontent 类  -->  <name>Product|Service</name>  <navlink>2.jsp</navlink>  <icon>images/icon.gif</icon>  <description>let\'s tak a look at our products.</description> </homepagecontent></homepagecollection>

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2.Homepagecontent.java,一个符合JavaBean规格的简单类

package tryForCastor;

public class Homepagecontent implements java.io.Serializable {

    private static final long serialVersionUID = 3689909565688657717L;

    private Integer id;

    private String name;

    private String navlink;        private String icon;

    private String description;

    public Homepagecontent() {    }

    public Integer getId() {        return id;    }

    public void setId(Integer id) {        this.id = id;    }

    public String getName() {        return name;    }

    public void setName(String name) {        this.name = name;    }        public String getNavlink() {        return navlink;    }

    public void setNavlink(String navlink) {        this.navlink = navlink;    }

    public String getIcon() {        return icon;    }

    public void setIcon(String icon) {        this.icon = icon;    }

    public String getDescription() {        return description;    }

    public void setDescription(String description) {        this.description = description;    }

}

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3.Homepagecollection.java,

package tryForCastor;

import java.util.*;

public class Homepagecollection implements java.io.Serializable {

    private static final long serialVersionUID = 3545239128603309878L;

    private String SiteName;

    private List homepagecontents = new ArrayList();

    public Homepagecollection() {    }

    // -- manipulate the List of Page objects    public void addHomePageContent(Homepagecontent homepagecontent) {        homepagecontents.add(homepagecontent);    }

    public List getHomepagecontents() {        return homepagecontents;    }

    // -- manipulate the name of the address book    public String getName() {        return SiteName;    }

    public void setName(String name) {        this.SiteName = name;    }

}

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4.mapping.xml,映射文件,把要转化的xml文件和java类联系起来

<?xml version="1.0" encoding="UTF-8"?><mapping> <description>a map file for our new template system</description> <class name="Homepagecontent">  <map-to xml="homepagecontent"/>  <field name="id" type="integer">   <bind-xml name="id" node="attribute" />  </field>  <field name="name" type="string" />  <field name="navlink" type="string" />  <field name="icon" type="string" />  <field name="description" type="string" /> </class> <class name="Homepagecollection">  <map-to xml="homepagecollection"/>  <field name="name" type="string">   <bind-xml name="name" node="attribute" />  </field>  <field name="homepagecontents" type="Homepagecontent"    collection="collection" /> </class></mapping>

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5.tryCastor.java,执行转化的类

package tryForCastor;

import java.io.FileReader;import java.io.FileWriter;import java.util.*;

import org.exolab.castor.mapping.Mapping;import org.exolab.castor.xml.Marshaller;import org.exolab.castor.xml.Unmarshaller;

/** * @author hbm *  */public class tryCastor {    public Mapping mapping;

    public String xmlfile;

    public void HomePageHandle(String mapfile, String xmlfile) throws Exception {        this.xmlfile = xmlfile;        try {            mapping = new Mapping();            mapping.loadMapping(mapfile); //读入映射文件        } catch (Exception e) {            throw new Exception(e.getMessage());        }

    }

    // -- page.xml中的数据读入Homepagecollection    public Homepagecollection read() throws Exception {        Homepagecollection homepages = null;        try {            Unmarshaller un = new Unmarshaller(Homepagecollection.class); // xml -> java 专用类            un.setMapping(mapping);

            FileReader in = new FileReader(xmlfile);            homepages = (Homepagecollection) un.unmarshal(in); //转换            in.close();        } catch (Exception e) {            throw new Exception(e.getMessage());        }        return homepages;    }

    // hbm add    public FileWriter write(String outFile, Object obj) throws Exception {        FileWriter out = new FileWriter(outFile);        try {            Marshaller mar = new Marshaller(out);// java-> xml专用类            mar.setMapping(mapping);            mar.marshal(obj);        } catch (Exception e) {            throw new Exception(e.getMessage());//转换        }        return out;    }

    /**     * @param args     */    public static void main(String[] args) {        tryCastor tc = new tryCastor();        try {            //从page.xml读入数据并放到对象hcollection 里            tc.HomePageHandle("mapping.xml", "page.xml");            Homepagecollection hcollection = tc.read();            List list = hcollection.getHomepagecontents();            for (Iterator iter = list.iterator(); iter.hasNext();) {                Homepagecontent h = (Homepagecontent) iter.next();                System.out.println(h.getDescription());                System.out.println(h.getIcon());                System.out.println(h.getName());                System.out.println(h.getNavlink());                System.out.println(h.getName2());                System.out.println(h.getId());                System.out.println(h.getClass());                System.out.println("+++++++++++++++++++++++");            }                        //写到xml文本            FileWriter fw = tc.write("d.xml", hcollection);            if (null != fw) {                fw.close();            }

        } catch (Exception e) {            e.printStackTrace();        }

    }

}



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小结:觉得写映射文件(mapping.xml)很麻烦,是否可以用映射来解决自动查找类字段来实现java到xml的转换?





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