類名：
? org.apache.commons.collections.BeanMap

用法：
? //...得到orderLine
? Map<String,Object> map = new BeanMap(orderLine);
? map.put("vendorDiscount",orderLine.getProduct().getVendor().getDiscount());

使用場景：
? dwr中可以直接把java對(duì)象轉(zhuǎn)換成js對(duì)象傳回，但是有時(shí)候需要在傳回的對(duì)象上附加屬性，例如在訂單項(xiàng)（訂單中的一行）中，我想附加相關(guān)產(chǎn)品的供應(yīng)商的信用等級(jí)的優(yōu)惠條件，如果直接把對(duì)象關(guān)系圖傳過去，需要傳4層，其實(shí)我只要在訂單項(xiàng)后附加一個(gè)屬性就行了。所以我就先把訂單項(xiàng)(OrderLine)轉(zhuǎn)化為一個(gè)map,向這個(gè)map中put新的屬性，這樣傳回到瀏覽器的對(duì)象還是和以前一樣的,只是附加了一個(gè)vendorDiscount:0.6 .

其一：
<div height="300px" style="overflow:scroll;">...</div>后滾動(dòng)條死活不出來,如果寫成

就一切正常。

后來發(fā)現(xiàn)如果直接使用style屬性，應(yīng)該寫成<div style="height:300px; overflow:scroll;">...</div>
nnd,郁悶，不禁敬仰美工的工作。

其二：
為了圖簡便，直接用dwr調(diào)用了manager的方法時(shí)，manager中引用的其他manager總是null，仔細(xì)想想，發(fā)現(xiàn)manager是由spring管理的，所以應(yīng)該creator="spring",而不是creator="new"。得解。
這樣調(diào)用終歸不爽，還是應(yīng)該有services才行，看來偷懶是不行了。

另：昨晚看了一下dwr2.0，發(fā)現(xiàn)ajax終于走到正道上了。Reverse Ajax! 在java中設(shè)置界面控件的內(nèi)容，細(xì)粒度的請(qǐng)求和更新，由后臺(tái)來主導(dǎo)完整業(yè)務(wù)邏輯，而html就像c/s程序中的資源文件一樣被加載，這樣才能真正適合企業(yè)應(yīng)用(網(wǎng)站還是用以前的才對(duì))。環(huán)境已經(jīng)成熟，到應(yīng)用不知道還要等多久
今天無意中竟然下載到了Refactoring Databases，哎呀，貪財(cái)貪財(cái)！
開發(fā)過程中database schema 的變化總是引起很多麻煩，希望這本書能有所幫助。

Ruby中遞歸層數(shù)好像有限制，如函數(shù)
def test(a)
?? if a==1
???? 1
?? else
???? a*test(a-1)
?? end
end?

puts test(780)
輸出：84972392897964072098249533940415832032901226147549483885937628906393387016759749166779390912108512193770727396731176148684817099219862241070518329897737419790700834153338358789804054247254662503406001643932256413944181262536626134781963753899870200241216683120301369375204827350328695627459108294334206019027913654171970749305552969884823232609436511764040695691647958710090181422374514248844937618454949350242415512115167050621676322866110695044767187626021475743251277035950696737988473189355598223688184822894258942937354547600827689072340880783574157611601536909313655637665907495308227315772813753604514703047972667545052382993341295609886125445821680344472136291787954204104578202488733326674486963013530280156726975853827440416172311405531398732685573114934257635906047009853269995109193159402626590282423997495520628272375213203911332399362264123774789131108251376802391556145557618075940012872003438523613025838162437433166091728438034202592564763334170361422871174553523479072202135150477947497462319792004248488747067669226929977889728474667753117513554197181549148693463434107347395476738175071015937790196691810903035212156632705787120639270121315037723516623976522946189161132382463371686857543746042274574224547052957738646625809966919808812294116127379399188579075359032740380579901160073141745025441935558361164158736914927029701136227557285045299271693750581590882877670856450852068994081414494717924806473008367067880435766156267541200120373117672789242005510204657433232442062443350842731528466220850546079536126591907570634996939687881634634077903962785409702209303560414980140946811644475359177263347973998479963954822343870777236845722878913093643097703061981548194975005332841862304172509388532508262400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

而
puts test(781)
輸出：
E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `*': stack level too deep (SystemStackError)
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
?... 727 levels...
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:5:in `test'
from E:/eclipse-SDK-3.2M6-win32/workspace/testruby/Test5.rb:9

Ruby一直被認(rèn)為沒有好的IDE，今天把RDT跑起來了，還不錯(cuò)，雖然還不能和JDT相比。

使用 Eclipse 插件 Ruby Development Tools
http://www-128.ibm.com/developerworks/cn/opensource/os-rubyeclipse/

為何配合RDT，我特地下載了一個(gè)Eclipse3.2M6,界面好花哨，但用起來心虛虛的，干活還使用3.1踏實(shí)。