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在Spring基础上实现自��q��异常处理框架

suprasoft Inc,. — Thu, 12 Feb 2009 14:58:00 GMT

摘要: 应用��目大致的体�pȝ��构：该异常处理框架满��的要求�Q? 完整的异常组�l�结�? 异常的统一处理可配�|�，受管式，方便使用完整的异常组�l�结构：用户可以方便的定义自��q��异常�Q�但所有UncheckedException需要��承BaseAppRunti... 阅读全文

suprasoft Inc,. 2009-02-12 22:58 发表评论

suprasoft Inc,. — Fri, 26 Dec 2008 08:53:00 GMT

Spring �?Struts在web.xml中增加的配置�Q?/p>

1:

   2: <context-param>

   3:     <param-name>contextConfigLocationparam-name>

   4:     <param-value>classpath:/SpringContext/applicationContext-web.xmlparam-value>

   5: context-param>

7:

   8: <listener>

   9:     <listener-class>org.springframework.web.context.ContextLoaderListener

  10:     listener-class>

  11: listener>

12:

  13: <filter>

  14:     <filter-name>struts2filter-name>

  15:     <filter-class>org.apache.struts2.dispatcher.FilterDispatcherfilter-class>

  17:     <init-param>

  18:         <param-name>configparam-name>

  19:         <param-value>struts-default.xml,struts-plugin.xml,struts/struts.xmlparam-value>

  20:     init-param>

  21: filter>

22:

  23: <filter-mapping>

  24:     <filter-name>struts2filter-name>

  25:     <url-pattern>*.dourl-pattern>

  26: filter-mapping>

�W�一个tag定义的是spring的配�|�文件地址到环境参�?context parameter)

�W�二个tag定义一个listener�?u>org.springframework.web.context.ContextLoaderListener,�q�里相当于j2ee容器�l�我们提供的main函数的切入点�Q�可以让我们做一些系�l�初始化的工作，需要实现的�c�L��Q�javax.servlet.ServletContextListener

�W�三个tag则定义了struts2的一个filter。Filter则是�Ҏ��ơ请求（可以通过filter-mapping指定�Q�做�q��o处理�Q�请求首先请�q�filter铄��处理�Q�然后再到HttpServlet的init�Ҏ��。对应的�c�L��Q�javax.servlet.Filter。上面先配置了一个filter,对应的类是org.apache.struts2.dispatcher.FilterDispatcher,参数则是struts的配�|�文件位�|?/p>

�W�四个参数定义了filter怎样行�ؓ�Q�显然它�?do为后�~�的请求应用struts2�q�个名称的filter

�q�里需要首先搞清楚servlet规范中什么是listener?

详细请参�?Servlet Listener和Filter

查看ContextLoaderListener可知�Q�它正好�l�承�?u>javax.servlet.ServletContextListener�Q�用于监听javax.servlet.ServletContextEvent事�g

/*

 * Copyright 2002-2007 the original author or authors.

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *      http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

*/

package org.springframework.web.context;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

/**

 * Bootstrap listener to start up Spring's root {@link WebApplicationContext}.

 * Simply delegates to {@link ContextLoader}.

 * This listener should be registered after

 * {@link org.springframework.web.util.Log4jConfigListener}

 * in web.xml, if the latter is used.

 * @author Juergen Hoeller

 * @since 17.02.2003

 * @see ContextLoaderServlet

 * @see org.springframework.web.util.Log4jConfigListener

*/

public class ContextLoaderListener implements ServletContextListener {

    private ContextLoader contextLoader;

/**

     * Initialize the root web application context.

*/

    public void contextInitialized(ServletContextEvent event) {

        this.contextLoader = createContextLoader();

        this.contextLoader.initWebApplicationContext(event.getServletContext());

/**

     * Create the ContextLoader to use. Can be overridden in subclasses.

     * @return the new ContextLoader

*/

    protected ContextLoader createContextLoader() {

        return new ContextLoader();

/**

     * Return the ContextLoader used by this listener.

     * @return the current ContextLoader

*/

    public ContextLoader getContextLoader() {

        return this.contextLoader;

/**

     * Close the root web application context.

*/

    public void contextDestroyed(ServletContextEvent event) {

        if (this.contextLoader != null) {

            this.contextLoader.closeWebApplicationContext(event.getServletContext());

此类implement了ServletContextListener的两个方法：

public void contextInitialized(ServletContextEvent event);

public void contextDestroyed(ServletContextEvent event);

分别做context的初始化和销�?/p>

另外提供了一个protected�Ҏ��Q�protected ContextLoader createContextLoader() 用于创徏真正做事情的代理�c�CotextLoader

和一个public�Ҏ��Q�public ContextLoader getContextLoader()�Q?/p>

可见�Q�这个Listener�cȝ��接将工作代理�l�了ContextLoader�c�M��

____________________________________________________________________________________________________________________________

我们按图索骥�Q�下面再分析org.springframework.web.context.ContextLoader

ContextLoader里面有个�U�有成员�Q�private WebApplicationContext context

此变量提供了create�Ҏ��Q?/p>

createWebApplicationContext(ServletContext servletContext, ApplicationContext parent)

因�ؓSpring提供了多�U�WebApplicationContext�c�，所以需要一个方法来军_��使用哪个WebApplicationContextContext�c?/p>

protected Class determineContextClass(ServletContext servletContext) throws ApplicationContextException {

        String contextClassName = servletContext.getInitParameter(CONTEXT_CLASS_PARAM);

        if (contextClassName != null) {

            try {

                return ClassUtils.forName(contextClassName);

            catch (ClassNotFoundException ex) {

                throw new ApplicationContextException(

                        "Failed to load custom context class [" + contextClassName + "]", ex);

        else {

            contextClassName = defaultStrategies.getProperty(WebApplicationContext.class.getName());

            try {

                return ClassUtils.forName(contextClassName, ContextLoader.class.getClassLoader());

            catch (ClassNotFoundException ex) {

                throw new ApplicationContextException(

                        "Failed to load default context class [" + contextClassName + "]", ex);

public static final String CONTEXT_CLASS_PARAM = "contextClass";

所以如果在web.xml中的中定义了参数contextClass�Q�那么直接就军_��了用此Context�c?/p>

否则�Q�就应用�~�省�{�略来决定��用哪个Context�c�R�?/p>

�~�省�{�略如下�Q?/p>

private static final Properties defaultStrategies;

static {

    // Load default strategy implementations from properties file.

    // This is currently strictly internal and not meant to be customized

    // by application developers.

    try {

        ClassPathResource resource = new ClassPathResource(DEFAULT_STRATEGIES_PATH, ContextLoader.class);

        defaultStrategies = PropertiesLoaderUtils.loadProperties(resource);

    catch (IOException ex) {

        throw new IllegalStateException("Could not load 'ContextLoader.properties': " + ex.getMessage());

实际上，�~�省�{�略从org\springframework\web\context\ContextLoader.properties 文�g中取得属性org.springframework.web.context.WebApplicationContext

我们看看ContextLoader.properties文�g的内容：

# Default WebApplicationContext implementation class for ContextLoader.

# Used as fallback when no explicit context implementation has been specified as context-param.

# Not meant to be customized by application developers.

org.springframework.web.context.WebApplicationContext=org.springframework.web.context.support.XmlWebApplicationContext

昄��Q�缺省的Context�c�d��?XmlWebApplicationContext�c?/p>

�Q�！�Q�真累啊�Q�Spring...

OK,�ȝ��知道用哪个Context�c�M��Q�那么现在到了create�q�个Context实例的时候了

protected WebApplicationContext createWebApplicationContext(

            ServletContext servletContext, ApplicationContext parent) throws BeansException {

        Class contextClass = determineContextClass(servletContext);

        if (!ConfigurableWebApplicationContext.class.isAssignableFrom(contextClass)) {

            throw new ApplicationContextException("Custom context class [" + contextClass.getName() +

                    "] is not of type [" + ConfigurableWebApplicationContext.class.getName() + "]");

        ConfigurableWebApplicationContext wac =

                (ConfigurableWebApplicationContext) BeanUtils.instantiateClass(contextClass);

        wac.setParent(parent);

        wac.setServletContext(servletContext);

        wac.setConfigLocation(servletContext.getInitParameter(CONFIG_LOCATION_PARAM));

        customizeContext(servletContext, wac);

        wac.refresh();

        return wac;

�q�里很容易理解，只不�q�它的创��Z��是直接new�Q�而是��装了一层，调用BeanUtils.instantiateClass()工具�Ҏ��

接下来设定WebApplicationCcontext实例的parent, servletContext,

其中配置文�g位置(web.xml�?的contextConfigLocation参数指定�?/p>

    contextConfigLocation

    value>classpath:/SpringContext/applicationContext-web.xml

    value>

倒数�W�二行调用的customizeContext()�Ҏ��目前Spring实现代码是空的，估计留作以后�Q�看来万事要留余地啊^_^�Q?/p>

最后一件事��是调用WebApplicationContext�?font color="#ff0000" size="4">refresh()�Ҏ��。（�q�个�Ҏ��是个stratup�Ҏ��Q�很重要。他�q�的事情后面会着重涉及）

最后就是真正做事的initWebApplicationContext()�Ҏ��Q?/p>

public WebApplicationContext initWebApplicationContext(ServletContext servletContext)

            throws IllegalStateException, BeansException {

        if (servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE) != null) {

            throw new IllegalStateException(

                    "Cannot initialize context because there is already a root application context present - " +

                    "check whether you have multiple ContextLoader* definitions in your web.xml!");

        servletContext.log("Initializing Spring root WebApplicationContext");

        if (logger.isInfoEnabled()) {

            logger.info("Root WebApplicationContext: initialization started");

        long startTime = System.currentTimeMillis();

        try {

            // Determine parent for root web application context, if any.

            ApplicationContext parent = loadParentContext(servletContext);

            // Store context in local instance variable, to guarantee that

            // it is available on ServletContext shutdown.

            this.context = createWebApplicationContext(servletContext, parent);

            servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, this.context);

            currentContextPerThread.put(Thread.currentThread().getContextClassLoader(), this.context);

            if (logger.isDebugEnabled()) {

                logger.debug("Published root WebApplicationContext as ServletContext attribute with name [" +

                        WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE + "]");

            if (logger.isInfoEnabled()) {

                long elapsedTime = System.currentTimeMillis() - startTime;

                logger.info("Root WebApplicationContext: initialization completed in " + elapsedTime + " ms");

            return this.context;

        catch (RuntimeException ex) {

            logger.error("Context initialization failed", ex);

            servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, ex);

            throw ex;

        catch (Error err) {

            logger.error("Context initialization failed", err);

            servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, err);

            throw err;

它其实做得事情很��单，调用loadParentContext()�Ҏ��获取父context,调用createWebApplicationContext()创徏WebApplicationContext实例

一切都��g��完成了，臛_��我们明白了配�|�文件是如何加蝲�q�去的，至于IoC容器如何帮你注入配置文�g中的bean�Q�下�ơ再探烦。线索是什么呢�Q�你�q�记得在createWebApplication()的最后一步做什么了吗？refresh(), 对了�Q�这个就是你作�ؓ职业"嘿客"要探索的下一个线�?/p>

suprasoft Inc,. 2008-12-26 16:53 发表评论

PO BO VO DTO POJO DAO概念及其作用�Q�附转换图）

suprasoft Inc,. — Fri, 26 Dec 2008 04:53:00 GMT

J2EE开发中大量的专业羃略语很是让�h�q�h��Q�尤其是跟一些高手讨论问题的时候，三分钟就被�h家满口的专业术语��h��了，PO VO BO DTO POJO DAO�Q�一大堆的就来了�Q�听�q�老罗对这�U�现象的批判的朋友会会心一�W�）�?

首先声明偶也不是什么高手，以下�ȝ��都是自己的体会。不对之处请您多指教�?

PO�Q?br>persistant object持久对象
最形象的理解就是一个PO��是数据库中的一条记录�?br>好处是可以把一条记录作��Z��个对象处理，可以方便的�{为其它对象�?

BO�Q?br>business object业务对象
主要作用是把业务逻辑��装��Z��个对象。这个对象可以包括一个或多个其它的对象�?br>比如一个简历，有教育经历、工作经历、社会关�pȝ��{��?br>我们可以把教育经历对应一个PO�Q�工作经历对应一个PO�Q�社会关�p�d��应一个PO�?br>建立一个对应简历的BO对象处理��历，每个BO包含�q�些PO�?br>�q�样处理业务逻辑�Ӟ��我们��可以针对BO��d��理�?

VO �Q?br>value object值对�?br>ViewObject表现层对�?br>主要对应界面昄��的数据对象。对于一个WEB��面�Q�或者SWT、SWING的一个界面，用一个VO对象对应整个界面的倹{�?

DTO �Q?br>Data Transfer Object数据传输对象
主要用于�q�程调用�{�需要大量传输对象的地方�?br>比如我们一张表�?00个字�D�，那么对应的PO��有100个属性�?br>但是我们界面上只要显�C?0个字�D�，
客户端用WEB service来获取数据，没有必要把整个PO对象传递到客户端，
�q�时我们��可以用只有�q?0个属性的DTO来传递结果到客户端，�q�样也不会暴露服务端表结�?到达客户端以后，如果用这个对象来对应界面昄��Q�那此时它的�w�䆾��p�{为VO

POJO �Q?br>plain ordinary java object ��单java对象
个�h感觉POJO是最常见最多变的对象，是一个中间对象，也是我们最常打交道的对象�?br>一个POJO持久化以后就是PO
直接用它传递、传递过�E�中��是DTO
直接用来对应表示层就是VO

DAO�Q?br>data access object数据讉K��对象
�q�个大家最熟悉�Q�和上面几个O区别最大，基本没有互相转化的可能性和必要.
主要用来��装�Ҏ��据库的访问。通过它可以把POJO持久化�ؓPO�Q�用PO�l�装出来VO、DTO
�ȝ��下我认�ؓ一个对象究竟是什么O要看具体环境�Q�在不同的层、不同的应用场合�Q�对象的�w�䆾也不一��P��而且对象�w�䆾的�{化也是很自然的。就像你对老婆来说��是老公�Q�对父母来说��是子女。设计这些概�늚�初衷不是��Z��唬�h而是��Z��更好的理解和处理各种逻辑�Q�让大家能更好的�ȝ��面向对象的方式处理问�?
大家千万不要陷入�q�度设计�Q�大可不必�ؓ了设计而设计一定要在代码中区分各个对象。一句话技术是为应用服务的�?br>�Ƣ迎指正�?

��M��个图�Q�感觉没有完全表辑և�自己的意思。。。。。谁帮忙完善下，最好能体现各个O在MVC中的位置

suprasoft Inc,. 2008-12-26 12:53 发表评论

web.xml详解

suprasoft Inc,. — Fri, 26 Dec 2008 03:34:00 GMT

每一个站的WEB-INF下都有一个web.xml的设定文�Ӟ��它提供了我们站台的配�|�设�?

web.xml定义�Q?br>.站台的名�U�和说明
.针对环境参数(Context)做初始化工作
.Servlet的名�U�和映射
.Session的设�?br>.Tag library的对�?br>.JSP�|�页讑֮�
.Mime Type处理
.错误处理
.利用JDNI取得站台资源

要了解web.xml的设定��|��必须了解它的schema,从web.xml中知道它的schema是由Sum Microsystems公司定制的，如果你想更�ؓ详细的了解它�Q?br>可以�?a >http://java.sun.com/xml/ns/j2ee/web-mapp_2_4.xsd�|�页�Q�那里有更�ؓ详细的介�l�。这里我介绍我们�q�_��见得最多的.

   1: xml version="1.0" encoding="ISO-8859-1"?>

2:

   3: <web-app xmlns="http://java.sun.com/xml/ns/j2ee"

   4:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

   5:     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

   6:     version="2.4">

   7: <web-app>

�q�是一般在写XML时所做的声明,定义了XML的版本，�~�码格式,�q�有重要的指明schema的来�?�?a >http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd.

,,
____________________________________________

站台描述
对站台做出描�q?

站台名称
定义站台的名�U?

icon元素包含small-icon和large-icon两个子元�?用来指定web站台中小图标和大图标的�\�?
/路径/smallicon.gif
small-icon元素应指向web站台中某个小图标的�\�?大小�?6 X 16 pixel,但是图象文�g必须为GIF或JPEG格式,扩展名必��Mؓ:.gif�?jpg.

/路径/largeicon-jpg
large-icon元素应指向web站台中某个大图表路径,大小�?2 X 32 pixel,但是图象文�g必须为GIF或JPEG的格�?扩展名必��Mؓ; gif
或jpg.
范例:

   1: <display-name>Develop Exampledisplay-name>

   2: <description>JSP 2.0 Tech Book's Examplesdescription>

   3: <icon>

   4:    <small-icon>/images/small.gifsmall-icon>

   5:    <large-icon>/images/large.girlarge-icon>

   6: icon>

7:

   8: <distributable>

______________________________________
distributable 元素为空标签,它的存在与否可以指定站台是否可分布式处理.如果web.xml中出现这个元�?则代表站台在开发时已经
被设计�ؓ能在多个JSP Container 之间分散执行.
范例:

   1: <distributable/>

___________________________________

context-param 元素用来讑֮�web站点�?u>环境参数(context),它包含两个子元素:
param-name和param-value.
参数名称
讑֮�Context名称
�?lt;/param-value>
讑֮�Context名称的�?br>
范例:

   1: <context-param>

   2:    <param-name>param_nameparam-name>

   3:    <param-value>param_valueparam-value>

   4: context-param>

此所讑֮�的参�?在JSP�|�页中可以��用下列方法来取得:

   1: ${initParam.param_name}

若在Servlet可以使用下列�Ҏ��来获�?

   1: String param_name=getServletContext().getInitParamter("param_name");

又如Spring framework在这里可以设�|�context参数

1:

   2: <context-param>

   3:     <param-name>contextConfigLocationparam-name>

   4:     <param-value>classpath:/SpringContext/applicationContext-web.xml

   5:     param-value>

   6: context-param>

_________________________________
filter元素用来声明filter的相兌��?filter元素除了下面介绍的的子元素之�?�q�包�?lt;servlet>介绍�q�的,
,,,其用途一�?
Filter的名�U?lt;/filter-name>
定义Filter的名�U?
Filter的类名称
定义Filter的类名称.例如:com.foo.hello

范例:

   1: <filter>

   2:   <filter-name>setCharacterEncodingfilter-name>

   3:   <filter-class>coreservlet.javaworld.CH11.SetCharacterEncodingFilterfilter-class>

   4:   <init-param>

   5:      <param-name>encodingparam-name>

   6:      <param-value>GB2312param-value>

   7:   init-param>

   8: filter>

9:

  10: <filter-mapping>

又如Struts2可以在这里设filter

   1: <filter>

   2:     <filter-name>struts2filter-name>

   3:     <filter-class>org.apache.struts2.dispatcher.FilterDispatcher

   4:     filter-class>

   5:     <init-param>

   6:         <param-name>configparam-name>

   7:         <param-value>struts-default.xml,struts-plugin.xml,struts/struts.xmlparam-value>

   8:     init-param>

   9: filter>

10:

  11: <filter-mapping>

  12:     <filter-name>struts2filter-name>

  13:     <url-pattern>*.dourl-pattern>

  14: filter-mapping>

______________________________________

filter-mapping 元素的两个主要子元素filter-name和url-pattern.用来定义Filter所对应的URL.
Filter的名�U?lt;/filter-name>
定义Filter的名�U?
URL
Filter所对应的RUL.例如:/Filter/Hello

Servlet的名�U?lt;servlet-name>
定义servlet的名�U?
REQUEST|INCLUDE|FORWARD|ERROR
讑֮�Filter对应的请求方�?有RQUEST,INCLUDE,FORWAR,ERROR四种,默认为REQUEST.

范例:

   1: <filter-mapping>

   2:    <filter-name>GZIPEncodingfilter-name>

   3:    <url-pattern>/*url-pattern>

   4: filter-mapping>

___________________________________________

servlet的名�U?lt;/servlet-name>

昄��名称
servlet对应的class�?lt;/servlet-class>

范例�Q?/p>

   1: <servlet>

   2:     <servlet-name>org.apache.jsp.index_jspservlet-name>

   3:     <servlet-class>org.apache.jsp.index_jspservlet-class>

   4: servlet>

_____________________________________________
servlet-mapping元素包含两个子元素servlet-name和url-pattern.用来定义servlet所对应URL.
Servlet的名�U?lt;/servlet-name>
定义Servlet的名�U?
Servlet URL
定义Servlet所对应的RUL.例如:/Servlet/Hello

范例:

   1: <servlet-mapping>

   2:    <servlet-name>LoginCheckerservlet-name>

   3:    <url-pattern>/LoginCheckerurl-pattern>

   4: servlet-mapping>

___________________________________________

listener元素用来定义Listener接口,它的主要子元素�ؓ
Listener的类名称
定义Listener的类名称.例如: com.foo.hello

范例:

   1: <listener>

   2:   <listener-class>coreservlet.javaworld.CH11.ContenxtListenerlistener-class>

   3: listener>

又如Spring framework可以在这里设listener

   1: <listener>

   2:     <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>

   3: listener>

__________________________________

session-config包含一个子元素session-timeout.定义web站台中的session参数.
分钟
定义�q�个web站台所有session的有效期�?单位为分�?

范例:

   1: <session-config>

   2:    <session-timeout>20session-timeout>

   3: session-config>

___________________________________________________

mime-mapping包含两个子元素extension和mime-type.定义某一个扩展名和某一MIME Type做对�?
扩展名名�U?lt;/extension>
扩展名称
MIME格式
MIME格式.

范例:

   1: <mime-mapping>

   2:    <extension>docextension>

   3:    <mime-type>application/vnd.ms-wordmime-type>

   4: mime-mapping>

   5: <mime-mapping>

   6:    <extension>xlsextension>

   7:    <mime-type>application/vnd.ms-excelmime-type>

   8: mime-mapping>

   9: <mime-mapping>

  10:    <extension>pptextesnion>

  11:    <mime-type>application/vnd.ms-powerpointmime-type>

  12: mime-mapping>

_____________________________________________

welcome-file-list包含一个子元素welcome-file.用来定义首页列单.
用来指定首页文�g名称
welcome-file用来指定首页文�g名称.我们可以�?lt;welcome-file>指定几个首页,而服务器会依照设定的��序来找首页.
范例:

   1: <welcome-file-list>

   2:   <welcome-file>index.jspwelcome-file>

   3:   <welcome-file>index.htmwelcome-file>

   4: welcome-file-list>

_________________________

error-page元素包含三个子元素error-code,exception-type和location.��错误代�?Error Code)或异�?Exception)的种�c�d��?br>到web站台资源路径.
错误代码
HTTP Error code,例如: 404
Exception
一个完整名�U�的Java异常�c�d��
/路径
在web站台内的相关资源路径

范例:

   1: <error-page>

   2:    <error-code>404error-code>

   3:    <location>/error404.jsplocation>

   4: error-page>

   5: <error-page>

   6:    <exception-type>java.lang.Exceptionexception-type>

   7:    <location>/except.jsplocation>

   8: error-page>

_______________________________________________

jsp-config元素主要用来讑֮�JSP的相关配�|?包括�?lt;jsp-property-group>两个子元�?其中元素
在JSP 1.2时就已经存在�?�?lt;jsp-property-group>是JSP 2.0新增的元�?

taglib元素包含两个子元素taglib-uri和taglib-location.用来讑֮�JSP�|�页用到的Tag Library路径.
URI
taglib-uri定义TLD文�g的URI,JSP�|�页的taglib指��o可以�l�由�q�个URI存取到TLD文�g.
/WEB-INF/lib/xxx.tld
TLD文�g对应Web站台的存放位�|?

jsp-property-group元素包含8个元�?分别�?
Description
此设定的说明

Name
此设定的名称

URL
讑֮�值所影响的范�?�?/CH2 或�?*.jsp

true|false
若�ؓtrue,表示不支持EL语法.

true|false
若�ؓtrue表示不支�?lt;%scription%>语法.

encoding
讑֮�JSP�|�页的编�?

.jspf
讄��JSP�|�页的抬�?扩展名�ؓ.jspf

.jspf
讄��JSP�|�页的结��?扩展名�ؓ.jspf

范例:

   1: <jsp-config>

   2: <taglib>

   3:    <taglib-uri>Taglibtaglib-uri>

   4:    <taglib-location>/WEB-INF/tlds/MyTaglib.tldtaglib-location>

   5: taglib>

   6: <jsp-property-group>

   7:    <description>

   8:       Special property group for JSP Configuration JSP example.

   9:    description>

  10:    <display-name>JSPConfigurationdisplay-name>

  11:    <uri-pattern>/*uri-pattern>

  12:    <el-ignored>trueel-ignored>

  13:    <page-encoding>GB2312page-encoding>

  14:    <scripting-inivalid>truescripting-inivalid>

  15:    ............

  16: jsp-property-group>

  17: jsp-config>

________________________________________________

resource-ref元素包括五个子元素description,res-ref-name,res-type,res-auth,res-sharing-scope.利用JNDI取得站点�?br>利用资源.
说明
资源说明

资源名称
资源名称

资源�U�类
资源�U�类

Application|Container
资源由Application或Container来许�?

Shareable|Unshareable
资源是否可以�׃�n.默认��gؓ Shareable
范例:

   1: <resource-ref>

   2:    <description>JNDI JDBC DataSource of JSPBookdescription>

   3:    <res-ref-name>jdbc/sample_dbres-ref-name>

   4:    <res-type>javax.sql.DataSoruceres-type>

   5:    <res-auth>Containerres-auth>

   6: resource-ref>

�q�些都是些比较常用的,详细可以��d��: http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd

suprasoft Inc,. 2008-12-26 11:34 发表评论

POJO2VO

suprasoft Inc,. — Thu, 25 Dec 2008 12:13:00 GMT

最�q�用Flex做UI,但是和业务层不好�l�合�Q�特地写了个业务BO转VO的class

只需要指定需要生成的目录�Q�就可以扚w��?BO.java转换�?VO.as

代码如下�Q?/p>

   1: /**

   2:  *

   3:  */

   4: package com.suprasoft.utils.flex;

5:

   6: /**

   7:  * @作�?Charles <chio.yang@gmail.com> Suprasoft Inc.,

   8:  *

   9:  * 2008-12-25

  10:  */

11:

  12: import java.io.BufferedWriter;

  13: import java.io.File;

  14: import java.io.FileWriter;

  15: import java.io.IOException;

  16: import java.lang.reflect.Field;

17:

  18: import org.apache.commons.lang.StringUtils;

19:

  20: public class POJO2VO {

  21:     public POJO2VO() {

  22:     }

23:

  24:     public static String getClassType(Class c) {

  25:         String typeName = c.getSimpleName();

  26: //        System.out.println("typename " + typeName);

  27:         // 数值型的都转成Number

  28:         if (typeName.equals("BigDecimal") || typeName.equals("Decimal")

  29:                 || typeName.equals("Double") || typeName.equals("int")

  30:                 || typeName.equals("Integer") || typeName.equals("Long")

  31:                 || typeName.equals("long")) {

  32:             return "Number";

  33:         } else if (typeName.equals("Boolean")) {

  34:             return "boolean";

  35:         } else if (typeName.equals("Set")) {

  36:             return "Array";

  37:         } else {

  38:             if (isBasicType(typeName)) {

  39:                 return typeName;// 其它�c�d��的设�|��ؓ未知�c�d��

  40:             } else {

  41:                 return typeName + "VO";// 自定义类型的�Q�加上VO�l�尾

  42:             }

  43:         }

44:

  45:     }

46:

  47:     // 是否基本的数据类�?/span>

  48:     public static boolean isBasicType(String type) {

  49:         return type.equals("String") || type.equals("BigDecimal")

  50:                 || type.equals("Decimal") || type.equals("Double")

  51:                 || type.equals("int") || type.equals("Integer")

  52:                 || type.equals("Boolean") || type.equals("Set")

  53:                 || type.equals("Long") || type.equals("long")

  54:                 || type.equals("Date");

  55:     }

56:

  57:     public static String repeat(String c, int count) {

  58:         String temp = "";

  59:         for (int i = 0; i < count; i++) {

  60:             temp += c;

  61:         }

62:

  63:         return temp;

  64:     }

65:

  66:     public static void makeDirByPackageName(String rootFolder, String packageName) {

67:

  68:         File folder = new File(rootFolder + "\\" + packageName.replace(".", "\\"));

  69:         if(!folder.exists()) {

  70:             folder.mkdirs();

  71:         }

  72:     }

73:

  74:     public static void generateAsFiles(String pojoQualifiedName ){

75:

  76:     }

77:

  78:     /**

  79:      * 生成as文�g

  80:      *

  81:      * @param pojoQualifiedName

  82:      * @param voPackageName

  83:      * @param folders

  84:      * @throws ClassNotFoundException

  85:      * @throws IOException

  86:      */

  87:     public static void generateAsFile(String pojoQualifiedName, String voPackageRootFolder, String voPackageName) throws ClassNotFoundException, IOException {

  88:         //pojoName必须带包名的Qualified Name

  89:         Class c = Class.forName(pojoQualifiedName);

  90:         Field[] fields = c.getDeclaredFields();

91:

  92:         POJO2VO.makeDirByPackageName(voPackageRootFolder, voPackageName);

  93:         // as的vo对象名称�l�尾加上VO标志

  94:         File f = new File(voPackageRootFolder + "\\"

  95:                         + voPackageName.replace(".", "\\") + "\\"

  96:                         + c.getSimpleName().replace("BO", "VO") + ".as");

97:

  98:         BufferedWriter bw = new BufferedWriter(new FileWriter(f));

  99:         // 包名�Q�没有设�|�包名就取和java pojo一��L��包名

 100:         if (StringUtils.isEmpty(voPackageName)) {

 101:             bw.write("package " + c.getPackage().getName() + "\n{\n");

 102:         } else {

 103:             bw.write("package " + voPackageName + "\n{\n");

 104:         }

 105:

 106:         // 写类

 107:         bw.write(repeat(" ", 4) + "public class " + c.getSimpleName().replace("BO", "VO") + "\n");

 108:         bw.write(repeat(" ", 4) + "{\n");

 109:

 110:         // 写属�?/pre> 111:         for (int i = 0; i < fields.length; i++) {
 112:             Class fieldType = fields[i].getType();
 113:             String typeName = getClassType(fieldType);
 114:             bw.write(repeat(" ", 8) + "private var _" + fields[i].getName()
 115:                     + ":" + typeName + ";\n");
 116:         }
 117:  
 118:         bw.write("\n\n\n");
 119:         // 写空的构造函�?/pre> 120:         bw.write(repeat(" ", 8) + "public function " + c.getSimpleName().replace("BO", "VO")
 121:                 + "(){}\n\n");
 122:  
 123:         // �?setter/getter �Ҏ��
 124:         for (int i = 0; i < fields.length; i++) {
 125:             Class fieldType = fields[i].getType();
 126:             String typeName = getClassType(fieldType);
 127:             // setter
 128:             bw.write(repeat(" ", 8) + "public function set "
 129:                     + fields[i].getName() + "(value:" + typeName + "):void{\n");
 130:             bw.write(repeat(" ", 12) + "this._" + fields[i].getName()
 131:                     + " = value;\n");
 132:             bw.write(repeat(" ", 8) + "}\n\n");
 133:             // getter
 134:             bw.write(repeat(" ", 8) + "public function get "
 135:                     + fields[i].getName() + "():" + typeName + "{\n");
 136:             bw.write(repeat(" ", 12) + "return this._" + fields[i].getName()
 137:                     + ";\n");
 138:             bw.write(repeat(" ", 8) + "}\n\n\n");
 139:  
 140:         }
 141:         bw.write(repeat(" ", 4) + "}\n");
 142:         bw.write("}");
 143:         bw.close();
 144:     }
 145:     
 146:     public static void generateAsFileBatch(String pojoPackageRootFolder, String pojoPackageName, String voPackageRootFolder, String voPackageName) throws ClassNotFoundException, IOException {
 147:         String packageFolder = pojoPackageRootFolder + "\\" + pojoPackageName.replace(".", "\\");
 148:         File dir = new File(packageFolder);
 149:         File[] files = dir.listFiles();
 150:         for(File file : files){
 151:             if(file.isDirectory()) continue;
 152:             
 153:             if(file.getName().endsWith("BO.java")){
 154:                 String pojoName = pojoPackageName + "." + file.getName().replace(".java", "");
 155:                 POJO2VO.generateAsFile(pojoName, voPackageRootFolder, voPackageName);
 156:             }
 157:         }
 158:     }
 159:  
 160:  
 161:     /*
 162:      * ���试
 163:      */
 164:     public static void main(String[] args) throws ClassNotFoundException, IOException {
 165:         
 166: //        String[] pojos = { "com.bankcomm.icms.domain.migrate.RawCollateralBasicBO" };
 167: //        for (int i = 0; i < pojos.length; i++) {
 168: //            POJO2VO.generateAsFile(pojos[i], "C:", "com.bankcomm.icms.domain");
 169: //        }
 170:  
 171:         POJO2VO.generateAsFileBatch("D:\\ICMS\\eclipse\\workspace\\Utils\\src\\", 
 172:                 "com.bankcomm.icms.domain.migrate", 
 173:                 "C:\\Documents and Settings\\Administrator\\My Documents\\Flex Builder 3\\Temp\\src", 
 174:                 "com.bankcomm.icms.domain");
 175:     }
 176: }

suprasoft Inc,. 2008-12-25 20:13 发表评论