把Java对象映射成XML文档，这是Java对象持久化的一种新思路。在XML.com的一篇文章里，作者对四种主要的Java-XML映射工具进行了全面的比较：
比较的标准主要有以下几条：（1）对XML大纲（schema）特性的支持程度；（2）生成Java代码的可用性；（3）Java-XML转换（以及反向转换）的工作情况。
测试的结果如下。可以看到，Sun的JAXB参考实现竟然有着绝佳的表现，不论在性能还是特性集方面，都仅次于XGen，名列第二。这让我对JAXB又多了几分信心。
|
Feature |
Breeze |
Castor |
JAXB RI |
XGen |
|
Customization Disallowed |
|
|
|
|
|
Package Name Mapped from Namespace |
|
|
1 |
|
|
Automatic Unmarshaling |
|
|
|
|
|
Open Source |
|
|
2 |
|
|
Free of Charge |
|
|
|
|
|
Schema Location Roundtrippable |
|
|
|
|
|
Schema Location Settable |
|
3 |
3 |
|
|
Schemas without a Target Namespace Supported |
|
|
|
|
|
Instance Validation on Unmarshal |
|
|
4 |
|
|
Constraint Check of Values on Set |
5 |
|
|
|
|
Value Validation when Marshaling |
|
|
|
5 |
|
Code Generation Command Line Tool Interface |
|
|
|
|
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Code Generation Programmatic Interface |
|
|
|
|
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Code Generation GUI Interface |
|
|
|
|
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Generated Code Implements Generic Interfaces |
|
|
6 |
|
1 -- Mapped if no other package name is specified.
2-- JAXB will be available as an open source project in the upcoming future. More information can be found at http://jaxb.dev.java.net/.
3 -- Only on marshaller class.
4 -- Off by default.
5 -- Some values validated.
6 -- Interfaces based on functionality instead of type of XML Schema construct. 
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