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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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