今日筆記系列之Castor

近日對Java對象與XML文本的相互轉換有一定興趣，於是乎在網上查看了一下相關的資料。發現了castor。

並浏覽了該頁面http://www.jdon.com/idea/castor.htm，但發現上面的代碼有一些錯漏。

自己用eclipse寫了一個簡單的代碼如下：（主要參考了上面提到的網站的內容）

該程序是讀入page.XML文件，然後轉化為java對象。接著把Java對象寫到另外一個文件裡。

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1.page.XML，要被轉化為對象的頁面

About Us 1.JSP images/icon.gif An in-depth look at creating applications with XML. Product|Service 2.JSPimages/icon.gif let's tak a look at our products.

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2.Homepagecontent.java，一個符合JavaBean規格的簡單類

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，把要轉化的XML文件和Java類聯系起來

a map file for our new template system

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5.tryCastor.Java，執行轉化的類

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); //讀入映射文件 } catch (Exception e) { throw new Exception(e.getMessage()); }

}

// -- page.xml中的數據讀入Homepagecollection public Homepagecollection read() throws Exception { Homepagecollection homepages = null; try { Unmarshaller un = new Unmarshaller(Homepagecollection.class); // XML -> Java 專用類 un.setMapping(mapping);

FileReader in = new FileReader(XMLfile); homepages = (Homepagecollection) un.unmarshal(in); //轉換 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專用類 mar.setMapping(mapping); mar.marshal(obj); } catch (Exception e) { throw new Exception(e.getMessage());//轉換 } return out; }

/** * @param args */ public static void main(String[] args) { tryCastor tc = new tryCastor(); try { //從page.xml讀入數據並放到對象hcollection 裡 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("+++++++++++++++++++++++"); } //寫到xml文本 FileWriter fw = tc.write("d.XML", hcollection); if (null != fw) { fw.close(); }

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

}

}

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小結：覺得寫映射文件（mapping.XML）很麻煩，是否可以用映射來解決自動查找類字段來實現Java到XML的轉換？