锁定老帖子 主题:无API侵入的JIOPi模块化编程风格达成
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发表时间:2010-06-17
最后修改:2010-06-17
无API侵入的JIOPi模块化编程风格达成 ——纯POJO风格实现简单邮件发送API调用
API侵入是任何框架都很难避免的问题,而被侵入框架API的程序也很容易被该框架绑定,很难脱离框架运行环境。JIOPi作为一种IOP编程和模块化编程风格(而非框架),一直努力减少额外API的引入,非运行时标注让JIOPi模块完全与POJO兼容,通过IoC框架整合,避免调用代码中再引入额外API。然而IoC框架整合也只是将JIOPi的API从用户的代码中转移到了IoC框架配置文件中,并且需要引入IoC框架。JIOPi 0.4引入了全新的类重定义代码风格,完全避免了使用JIOPi模块而需要引入JIOPi API的问题,真正将JIOPi从框架变为编程风格,将编程风格的实现变为透明实现,你要做的,只是将一个不到50k的Jar包放在lib目录中,然后在应用程序启动后尽早调用JIOPi的初始化程序函数。
注:JDK1.5无法实现上下文环境(ContextClassLoader)中的类重定义,这个特性需要JDK1.6的支持。
下面就以调用一个简单邮件发送API为例来说明JIOPi v0.4带来的无API侵入风格的模块化编程。相关源码请下载JIOPi-iBean-0.4.0.0-src.zip源码包 http://code.google.com/p/ibean/downloads/list
邮件发送API定义如下: MailSender.java package org.jiopi.blueprint.mailsender; import org.jiopi.framework.annotation.blueprint.RegisterControlPanel; @Version @RegisterControlPanel("jiopi.MailSender") public interface MailSender { @RegisterControlPanel("sendMail") public String sendMail(String to,String subject,String message) throws SendMailException; public String sendMail(String to,String subject,String html,String text) throws SendMailException; @RegisterControlPanel("createNewTextMail") public Mail createNewTextMail(); @RegisterControlPanel("createNewHtmlMail") public Mail createNewHtmlMail(); public String getHostName(); public String getAuthenticationUserName(); public String getAuthenticationPassword(); public String getFrom(); public String getCharset(); }
Mail.java package org.jiopi.blueprint.mailsender; import java.io.File; import java.net.URL; import org.jiopi.framework.annotation.blueprint.RegisterControlPanel; @Version @RegisterControlPanel("jiopi.Mail") public interface Mail { public final int TEXT_MAIL = 1; public final int HTML_MAIL = 2; public void addTo(String to); public void addTo(String email,String name); public void setFrom(String from); public void setFrom(String email,String name); public void setSubject(String subject); public void setTextMsg(String text); public void setHtmlMsg(String html); public void changeMailType(int mailType); public String embed(URL url); public String embed(File file); public void attach(MailAttachment attachment); public String send() throws SendMailException; }
MailAttachment.java package org.jiopi.blueprint.mailsender; import java.io.File; import java.net.URL; @Version public final class MailAttachment implements java.io.Serializable{ private static final long serialVersionUID = 3366988524797658258L; public final File file; public final URL url; private String name; private String description; public MailAttachment(File file){ this.file = file; this.url = null; } public MailAttachment(URL url){ this.url = url; this.file = null; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } }
以上是主要的三个类,还有一个Version.java定义版本信息,SendMailException.java定义了一个异常
如果只想发送简单邮件,可直接调用MailSender的sendMail方法,如果想发送带附件的邮件,则需要使用Mail对象,Mail对象可以从MailSender中生成,而在JIOPi v0.4中,则也可以直接new出来。并且可以将本不是静态方法的sendMail方法转换为静态方法,实现如下代码的简单调用: MyMailSender.sendMyMail("姓名<to@yourmail.com>", "hello", "content test");
下面我们就来一步一步实现基于JIOPi模块化编程的简单邮件发送API的调用。
MyMailSender.java package org.jiopi.ibean.show.mailsender; import org.jiopi.blueprint.mailsender.Mail; import org.jiopi.blueprint.mailsender.MailSender; import org.jiopi.blueprint.mailsender.SendMailException; public class MyMailSender implements MailSender { private static MailSender instance = new MyMailSender(); public Mail createNewHtmlMail() { // TODO Auto-generated method stub return null; } public Mail createNewTextMail() { // TODO Auto-generated method stub return null; } public String getAuthenticationPassword() { // TODO Auto-generated method stub return null; } public String getAuthenticationUserName() { // TODO Auto-generated method stub return null; } public String getCharset() { // TODO Auto-generated method stub return null; } public String getFrom() { // TODO Auto-generated method stub return null; } public String getHostName() { // TODO Auto-generated method stub return null; } public String sendMail(String arg0, String arg1, String arg2) throws SendMailException { // TODO Auto-generated method stub return null; } public String sendMail(String arg0, String arg1, String arg2, String arg3) throws SendMailException { // TODO Auto-generated method stub return null; } public static Mail createMyNewHtmlMail() { return instance.createNewHtmlMail(); } public static Mail createMyNewTextMail() { return instance.createNewTextMail(); } public static String sendMyMail(String arg0, String arg1, String arg2) throws SendMailException { return instance.sendMail(arg0, arg1, arg2); } public static String sendMyMail(String arg0, String arg1, String arg2, String arg3) throws SendMailException { return instance.sendMail(arg0, arg1, arg2, arg3); } }
MyMail.java package org.jiopi.ibean.show.mailsender; import java.io.File; import java.net.URL; import org.jiopi.blueprint.mailsender.Mail; import org.jiopi.blueprint.mailsender.MailAttachment; import org.jiopi.blueprint.mailsender.SendMailException; public class MyMail implements Mail { public void addTo(String arg0) { // TODO Auto-generated method stub } public void addTo(String arg0, String arg1) { // TODO Auto-generated method stub } public void attach(MailAttachment arg0) { // TODO Auto-generated method stub } public void changeMailType(int arg0) { // TODO Auto-generated method stub } public String embed(URL arg0) { // TODO Auto-generated method stub return null; } public String embed(File arg0) { // TODO Auto-generated method stub return null; } public String send() throws SendMailException { // TODO Auto-generated method stub return null; } public void setFrom(String arg0) { // TODO Auto-generated method stub } public void setFrom(String arg0, String arg1) { // TODO Auto-generated method stub } public void setHtmlMsg(String arg0) { // TODO Auto-generated method stub } public void setSubject(String arg0) { // TODO Auto-generated method stub } public void setTextMsg(String arg0) { // TODO Auto-generated method stub } }
其中MyMailSender中,又额外添加了几个静态方法,这是为了可以更加方便调用。
下面需要配置 jiopi.module.mailsender 模块,配置发送邮件所需的设置,以及类重定义设置: <?xml version="1.0" encoding="UTF-8"?> <configuration xmlns="http://www.jiopi.org/2010/JIOPISchema" xmlns:jiopi="http://www.jiopi.org/2010/JIOPISchema-configuration" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.jiopi.org/2010/JIOPISchema configuration/jiopi-config-configuration.xsd "> <module name="jiopi.module.mailsender" version="0.1"> <controlpanel name="jiopi.MailSender" id="mymail"> <properties> <property name="hostname"><value>smtp.yourmail.com</value></property> <property name="username"><value>yourname@yourmail.com</value></property> <property name="password"><value>yourpassword</value></property> <property name="charset"><value>UTF-8</value></property> <property name="from"><value>姓名 <yourname@yourmail.com></value></property> </properties> </controlpanel> <controlpanel name="jiopi.Mail" id="mymail"> <inner-accessory id="mailSender" module="this" configuration="mymail"/> </controlpanel> </module> <redefine class="org.jiopi.ibean.show.mailsender.MyMailSender" module="jiopi.module.mailsender" version="0.1" controlpanel="jiopi.MailSender" configuration="mymail"/> <redefine class="org.jiopi.ibean.show.mailsender.MyMail" module="jiopi.module.mailsender" version="0.1" controlpanel="jiopi.Mail" configuration="mymail"/> </configuration>
控制面板配置中,使用了指定配置ID,通过配置不同的ID,你可以创建多个实现类,以使用不同的邮件配置。 redefine标签则定义了将用哪个模块的哪个控制面板来重定义指定类,从而避免使用额外的API来获取实现模块,通过类重定义,你可以直接new出来而不是通过额外的API来get。
MyMailSender.sendMyMail("姓名<to@yourmail.com>", "hello", "content test"); Mail myMail = new MyMail(); myMail.addTo("to@yourname.com","姓名"); myMail.setSubject("测试邮件"); myMail.setTextMsg("测试内容"); MailAttachment attachment = new MailAttachment(new URL("http://www.google.com.hk/intl/zh-CN/images/logo_cn.png")); myMail.attach(attachment); myMail.send();
当然,你需要先调用一下JIOPi的初始化函数 FrameworkInitializer.initialize();
纯POJO+非运行时Annotation(蓝图和模块中)+XML装配文件=Java模块化系统
这便是JIOPi v0.4带来的Java模块化编程风格。
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