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1. castor是什么
castor是一种将java对象和xml自动绑定的开源软件. 它可以在java对象,xml文本,sql数据表以及ldap目录之间绑定.
²网址: http://www.castor.org/
2. castor使用
²java对象指的是具有setx和getx方法的javabean,将castor用于javabean具体使用方法如下:
ø缺省用法: 缺省用法指的是没有使用映射格式描述文件时的用法
import java.io.*;
import org.exolab.castor.xml.*;
public class test
{
public static void main(string[] argv) {
// build a test bean
flightbean bean = new flightbean();
bean.setcarrier("ar");
bean.setnumber(426);
bean.setdeparturetime("6:23a");
bean.setarrivaltime("8:42a");
try {
// write it out as xml
file file = new file("test.xml");
writer writer = new filewriter(file);
marshaller.marshal(bean, writer);
// now restore the value and list what we get
reader reader = new filereader(file);
flightbean read = (flightbean)
unmarshaller.unmarshal(flightbean.class, reader);
system.out.println("flight " + read.getcarrier() +
read.getnumber() + " departing at " +
read.getdeparturetime() +
" and arriving at " + read.getarrivaltime());
} catch (ioexception ex) {
ex.printstacktrace(system.err);
} catch (marshalexception ex) {
ex.printstacktrace(system.err);
} catch (validationexception ex) {
ex.printstacktrace(system.err);
}
}
}
ø 标准用法：
import java.io.*;
import org.exolab.castor.xml.*;
import org.exolab.castor.mapping.*;
public class test
{
public static void main(string[] argv) {
// build a test bean
flightbean bean = new flightbean();
bean.setcarrier("ar");
bean.setnumber(426);
bean.setdeparturetime("6:23a");
bean.setarrivaltime("8:42a");
try {
// write it out as xml
mapping map=new mapping();
map.loadmapping("mapping.xml");
file file = new file("test.xml");
writer writer = new filewriter(file);
marshaller marshaller =new marshaller(writer);
marshaller.setmapping(map);
marshaller.marshal(bean);
// now restore the value and list what we get
reader reader = new filereader(file);
unmarshaller unmarshaller = new unmarshaller(map);
flightbean read = (flightbean)unmarshaller.unmarshal(reader);
system.out.println("flight " + read.getcarrier() +
read.getnumber() + " departing at " +
read.getdeparturetime() +" and arriving at " + read.getarrivaltime());
} catch (ioexception ex) {
ex.printstacktrace(system.err);
} catch (marshalexception ex) {
ex.printstacktrace(system.err);
} catch (validationexception ex) {
ex.printstacktrace(system.err);
}
catch (mappingexception ex) {
ex.printstacktrace(system.err);
}
}
}
ø :缺省用法生成的xml文件如下:
<?xml version="1.0" encoding="utf-8"?>
<arrival-time>8:42a</arrival-time>
<departure-time>6:23</departure-time>
<carrier>ar</carrier>
也就是说
•对于具有基本类型值的属性创建元素的一个属性（本例中只有 number 属性通过 getnumber() 方法公开为 int 值）。
•对于每个具有对象类型值的属性创建根元素的一个子元素（本例中的所有其他属性，因为它们是字符串）。
ø标准用法生成的xml文件如下:
<?xml version="1.0" encoding="utf-8"?>
<flight carrier="ar" depart="6:23a" arrive="8:42a" number="426"/>
这一般是我们期望的，只所以生成我们所期望的格式，是因为我们使用了映射格式描述文件。它也是xml文件:
<!doctype databases public "-//exolab/castor mapping dtd version 1.0//en" "http://castor.exolab.org/mapping.dtd"><mapping> <description>basic mapping example</description> <class name="castortest.flightbean" auto-complete="true"> <map-to xml="flight"/> <field name="carrier"> <bind-xml name="carrier" node="attribute"/> </field> <field name="departuretime"> <bind-xml name="depart" node="attribute"/> </field> <field name="arrivaltime"> <bind-xml name="arrive" node="attribute"/> </field> </class></mapping>• 注意class标签里name应该是带有包名的javabean类全名
•map-to xml="flight"指xml文件的根节点,区分大小写
•auto-complete=”false”或没有auto-complete属性时number属性会没有
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