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该话题已被移动 - floater , 2004-06-16 01:58
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Re:J2EE交流贴 [Re:Jove]

floater

Java Jedi

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发贴: 3233
积分: 421

于 2004-06-16 03:05

I moved this post to here for further discussion. I just contribute some of my thoughts here too:

1. Page 3, VOs should be replaced with interfaces. We should *not* pass objects between layers, but interfaces. Each layer could have its own implementation of the interfaces. The interfaces should belong to the business layer(why???)
2. Page 4, add/remove/update methods should have parameter user, not integer. Don't expose implementation. What if one day we need to change this id to 36 digit guid? Changing from 3-digit to 4 caused an earthquake in my working company, what if more than that?
3. Page 4, yes, normally we shouldn't care about db shifting in business applications, unless we are doing some middleware or like, e.g., forums/jive.
4. Page 6, yes, start from db side, get schema done first, then use middlegen hibernate to generate hbm files, then use tools to generate java classes(be careful here when you go hbm-->java, if you have inheritance, you have to read in parent hbms first before you read in child hbms). One more note: After we settle the business layer, the schema could be derived in several ways, read scott ambler's articles for 4 ways to do this.
5. Page 7, JDBCTemplates etc could be done better in the following:
a. queryForObject/Long/Int should be improved to return a uniform object, like in SQLExecutor interface. Same as input. SQLExecutor's interface is nices to api callers.
b. not sure about callbacks and inner classes, seems we just do what SQLExecutor does, it will be good enough.
6. Page 10, on datasource. The settings for different layers should be in seperate files(although we may read all of them into the context) so each layer is independent of others. Sample code constantly misleads this. And I don't like to read settings from resources from classpath because the collision is uncontrollable.
7. Page 11, web layer.
General speaking, there are 3 kinds of presentation tools:
a. velocity: scripting based
b. xml: xslt, xml based
c. tapestry: object based
jsp based is somewhere in the middle. Others are faces, tiles, portlets.
MVC model(well, not really mvc) - reads professional jsp chapter 7(new version) or 12(old version) for models, especially model 2 and 2x.
Hell to struts and hail to spring, Tounge

.
What's wrong with spring's mvc? abuse of templates! This abuse breaks the workflow's logic(This workflow is to send output to browsers). The usage pattern is more like swing applications. You have to do things in a certain way, certain order. BUT the underlying is doing right, so still the best one so far.
page 14. spring bean package: doesn't have a way to write back to files. Swing applications need this feature, like firewall settings, etc. Once users config'd, they want to save them.
page 15. AOP, not sure about this. If we combine AOP and python, that's going to be something. Check Thinking in java's author's website on python.
BTW, there is a Jython out there too.
Others:
Transactions.

questions:
Why do we use spring transactions rather than Connection's autocommit or jta/jts?
Why do we use spring web mvc rather than struts?
What's the difference between beanfactory and applicationcontext?

"Any fool can write code that a computer can understand. Good programmers write code that humans can understand."
- Martin Fowler, Refactoring - Improving the Design of Existing Code

话题树型展开

人气	标题	作者	字数	发贴时间
25010	[精华] J2EE交流贴	Jove	129	2004-06-15 16:11
21276	Re:J2EE交流贴	jfml	15	2004-06-15 16:16
21141	Re:J2EE交流贴	floater	3646	2004-06-16 22:39
21140	Re:J2EE交流贴	hitaco	1731	2004-06-16 23:17
21269	Re:J2EE交流贴	jigsaw	573	2004-06-17 09:36
21137	Re:J2EE交流贴	hitaco	1161	2004-06-17 10:13
21194	Re:J2EE交流贴	jigsaw	335	2004-06-17 09:44
21198	Re:J2EE交流贴	floater	322	2004-06-17 10:00
21188	Re:J2EE交流贴	floater	69	2004-06-17 10:13
21180	Re:J2EE交流贴	chenyajun5	21	2004-06-17 11:16
21165	Re:J2EE交流贴	zyzhang	1828	2004-06-17 22:04
21147	Re:J2EE交流贴	floater	460	2004-06-18 09:22
21243	Re:J2EE交流贴	Jove	617	2004-06-18 10:24
21086	Re:J2EE交流贴	floater	1158	2004-06-18 13:50
21147	Re:J2EE交流贴	Jove	308	2004-06-18 14:48
21219	Re:J2EE交流贴	nothing	4	2004-06-15 16:34
21094	Re:J2EE交流贴	floater	431	2004-06-18 21:32
20990	Re:J2EE交流贴	zyzhang	3887	2004-06-22 01:48
22611	Re:J2EE交流贴	zhbk	10	2004-07-30 14:58
21051	Re:J2EE交流贴	winconcom	23	2004-09-09 11:45
21429	Re:J2EE交流贴	jigsaw	55	2004-06-15 16:57
21368	Re:J2EE交流贴	wes109	0	2004-06-15 17:21
21319	Re:J2EE交流贴	wes109	25	2004-06-15 17:34
21320	Re:J2EE交流贴	zyzhang	412	2004-06-15 18:14
21974	Re:J2EE交流贴	floater	3201	2004-06-16 03:05
21214	Re:J2EE交流贴	jigsaw	4037	2004-06-16 13:45
21089	Re:J2EE交流贴	zyzhang	5937	2004-06-16 19:44
21297	Re:J2EE交流贴	Jove	357	2004-06-16 14:31
21213	Re:J2EE交流贴	Jove	136	2004-06-17 10:04
21234	Re:J2EE交流贴(2nd rar)	Jove	58	2004-06-17 10:06

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