webdw0.2版本用户手册发布[http://liujunsong.a108.xunbiz.com/]

本文探讨了JavaWeb开发的复杂性,分析了HTML语言设计初衷及其对开发效率的影响,并概述了JavaWeb开发过程中面临的多种技术和框架。

Webdw0.2版本用户手册
前言
为什么Java Web开发如此复杂?
互联网出现以后,应用程序的架构迅速发生变化,曾经流行一时的C/S模式很快被B/S模式所取代。但B/S的应用架构相对于C/S的应用架构,要复杂很多。这就造成了应用程序开发的效率低下,界面低效,用户体验差,维护升级困难。按照我个人的经验,以PB和Java来同时开发一套系统,Java的开发效率最多是PB的1/5,而生成的代码总量至少是4倍以上,这一估计还不包括Java本身所需要的各种架构在内,仅就代码而言,包括Java代码和JSP代码。
为什么一个如此流行的开发模式,开发效率会如此之低呢?
这一问题我思考了很久,最后终于找到了答案。Java开发的效率之所以低,最核心的原因在于HTML语言本身。这个语言的设计初衷,仅仅是为了显示标准化的文本而设计的,后来才加上了图形,以及插件,后来为了增加交互性,才增加了JavaScript等脚本的支持。但JavaScript本身又是单独一个标准,不包含在HTML之内。
简单来说一句话,HTML语言在设计的时候,根本就没有考虑过未来应用如何用它来开发,它仅仅是一个显示文本的定义语言。后来为了迁就应用开发的需要,人们在试图在这个地基上面加上其他功能,但又要兼顾对现有标准的支持和兼容,又要兼顾到现有各方的利益诉求,于是HTML本身变得越来越复杂,越来越难以理解,学习它的成本也变得很高,而效果并不明显。
刚才说的是Java的开发效率,怎么又扯到HTML了呢?
这是因为,非常不幸,Java在浏览器上的开发,不仅没有成为主流,而且基本已经被抛弃了,Applet本来是一种非常有前途,非常有潜力的技术,但在政治斗争中成为了牺牲品。现在知道的人已经不多了。
在一般的Java B/S架构开发中,可以用下面的图来演示。


上面这个图仅仅描述了在Java Web开发这个混乱的世界里面,开发一个Java系统所需要的一小部分技术的一小部分。
在浏览器上,开发需要用到的是HTML,JavaScript,Ajax,另外需要考虑:浏览器不同类型,不同版本的兼容性
在Web Server端,一般至少会用到Jsp,Servlet,再加上各种各样,千奇百怪的框架,如Structs,Webwork等等
在App Server端,则是各种技术的混合,EJB,Spring,Hibernate,Itabias,如果愿意写下去的话,恐怕这一张纸都列不完。另外还要考虑不同厂家产品的不同特性,不同版本的不同支持,在不同操作系统平台上的微妙差异等等。
数据库服务器相对要简单一些,但如果愿意的话,也可以搞得很复杂。这个就不再多说了。

Java 的Web开发,用到了太多的技术,太多的框架,太多的产品,也许从某个局部来观察,会认为这个不算太复杂,但从整体上宏观的来看,这个系统是在太复杂了。涉及到了多方面的技术,每一种技术都需要你花时间去了解,去学习,但与此同时它本身还在迅速演化,变异。
但是,这些技术,真的都是那么必要的吗?真的不可缺少吗?
如果答案是肯定的,那么我们就面对着在<<人月神话>>中同样的困境,无数的巨兽在泥沼中挣扎,但它们挣扎得越厉害,陷的就越深。软件行业就会变成一个不断制造复杂性,并且依赖这种复杂性进行生存的行业。在我看来,目前的情况似乎就是如此。大家都在拼命提出一个又一个的新概念,把整个系统搞得越来越复杂,很快系统的复杂性把它自己压垮了。怎么办,推倒重来,升级。买更快的机器,因为我们的程序越来越慢。
硬件行业有一个摩尔定律:
每过十八个月,芯片集成度提高一倍。
软件行业有一个逆摩尔定律:
每过十八个月,软件速度降低一半。(开发速度与运行速度)
两者相加的结果就是:如果你不升级硬件,软件就会越来越慢,最后无法使用。而且即使你升级了硬件,系统的速度还是提不上去。

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warnings.warn(msg, ConvergenceWarning) [2]: Selection deleted # 打印固定效应参数 print("固定效应参数:") print(result.params) # 打印随机效应参数(每个 subject_id 的随机截距) print("\n随机效应参数:") print(result.random_effects) 固定效应参数: Intercept 0.069718 gestational_age 0.002925 BMI -0.001253 subject_id Var 2.553846 dtype: float64 随机效应参数: {'A002': subject_id -0.0241 dtype: float64, 'A003': subject_id -0.015615 dtype: float64, 'A004': subject_id -0.014644 dtype: float64, 'A005': subject_id 0.004143 dtype: float64, 'A006': subject_id 0.006619 dtype: float64, 'A007': subject_id -0.048451 dtype: float64, 'A008': subject_id -0.029304 dtype: float64, 'A009': subject_id 0.004582 dtype: float64, 'A010': subject_id -0.054197 dtype: float64, 'A011': subject_id -0.025226 dtype: float64, 'A012': subject_id -0.03176 dtype: float64, 'A013': subject_id 0.041425 dtype: float64, 'A014': subject_id -0.028542 dtype: float64, 'A015': subject_id -0.025124 dtype: float64, 'A016': subject_id -0.00418 dtype: float64, 'A017': subject_id -0.010248 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float64, 'A257': subject_id 0.007344 dtype: float64, 'A258': subject_id -0.007284 dtype: float64, 'A259': subject_id 0.037988 dtype: float64, 'A260': subject_id 0.031785 dtype: float64, 'A261': subject_id 0.004856 dtype: float64, 'A262': subject_id 0.03399 dtype: float64, 'A263': subject_id 0.000434 dtype: float64, 'A264': subject_id 0.014552 dtype: float64, 'A265': subject_id 0.016166 dtype: float64, 'A266': subject_id 0.008422 dtype: float64, 'A267': subject_id 0.034722 dtype: float64} [3]: # 提取残差方差 residual_var = result.scale print("残差方差:", residual_var) 残差方差: 0.0003011881431690362 [4]: Selection deleted # F 检验:gestational_age 和 BMI 是否联合显著 print("\nF 检验结果(联合显著性):") f_test = result.f_test(['gestational_age', 'BMI']) print(f_test.summary()) # T 检验:查看每个变量的 p 值 print("\nT 检验结果(p 值):") print(result.pvalues) F 检验结果(联合显著性): <F test: F=79.20489718888852, p=2.4130842803847673e-31, df_denom=617, df_num=2> T 检验结果(p 值): Intercept 4.649165e-04 gestational_age 1.039132e-35 BMI 4.939513e-02 subject_id Var 6.014150e-13说明模型效果怎么样
最新发布
09-06
固定效应参数: Intercept 0.068466 gestational_age 0.003049 BMI -0.001303 subject_id Var 2.829078 dtype: float64 随机效应参数: {'A001': subject_id -0.035055 dtype: float64, 'A002': subject_id -0.033353 dtype: float64, 'A003': subject_id -0.017354 dtype: float64, 'A004': subject_id -0.019832 dtype: float64, 'A005': subject_id 0.016035 dtype: float64, 'A006': subject_id 0.001921 dtype: float64, 'A007': subject_id -0.048269 dtype: float64, 'A008': subject_id -0.036862 dtype: float64, 'A009': subject_id -0.003584 dtype: float64, 'A010': subject_id -0.055105 dtype: float64, 'A011': subject_id -0.024666 dtype: float64, 'A012': subject_id -0.028721 dtype: float64, 'A013': subject_id 0.032073 dtype: float64, 'A014': subject_id -0.023335 dtype: float64, 'A015': subject_id -0.024835 dtype: float64, 'A016': subject_id 0.002777 dtype: float64, 'A017': subject_id -0.009749 dtype: float64, 'A018': subject_id -0.029843 dtype: float64, 'A019': subject_id -0.01749 dtype: float64, 'A020': subject_id -0.007834 dtype: 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float64} Click to add a cell.根据所给参数把这个表达式写出来
09-06
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