今日笔记系列之Castor

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

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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