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。 **************************************************************************** 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> **************************************************************************** 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;
} }
**************************************************************************** 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;
} }
**************************************************************************** 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> **************************************************************************** 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();
} } }
**************************************************************************** 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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