bing — Tue, 16 Mar 2010 07:05:00 GMT

部分�Q?�Q�：GUICE �?Servlet 集成

http://code.google.com/p/google-guice/wiki/Servlets

Guice 提供了与 Servlet 的集成，可以完全替代 web.xml�Q��用类型安全，Java�E�序员所习惯的方式对 servlet �?filter �q�行配置�?a name="Introduction">

  <filter>
    <filter-name>guiceFilterfilter-name>
    <filter-class>com.google.inject.servlet.GuiceFilterfilter-class>
  filter>

  <filter-mapping>
    <filter-name>guiceFilterfilter-name>
    <url-pattern>/*url-pattern>
  filter-mapping>

首先�Q�下载最新版本的 guice-servlet jar 包，��其�?guice 的包共同攑֜� classpath 路径下。然后将 GuiceFilter 攑֜� web.xml 的�v始位�|�，�q�样�Q�对于�Q何�\径，guiceFilter 都会被��用，得到控制�?br />
下面�Q�要�?Guice �q�行配置�Q�方法是�Q?nbsp; Guice.createInjector(newServletModule());

�q�句话可以在��M��时候被调用�Q�但推荐的做法是在一�?ServletContextListener 中被调用�Q�这�?Listener �?Web 应用启动时被调用�Q�在��M��h��到来之前。做法如下，首先扩展 Google 提供的基�c�：

public class MyGuiceServletConfig extends GuiceServletContextListener {

  @Override
  protected Injector getInjector() {
    return Guice.createInjector(new ServletModule());
  }
}

然后�?web.xml 中进行注�?br />

<listener>
<listener-class>com.example.MyGuiceServletConfiglistener-class>
listener>

配置 servlet 是在 ServletModule 中进行的。以下是一个匿名类的例子：

   Guice.createInjector(, new ServletModule() {

     @Override
     protected void configureServlets() {
       serve("*.html").with(MyServlet.class)
     }
   }

可以�?web.xml风格的�\径限制法 serve("/my/*").with(MyServlet.class)�?br />
也可以类似地配置 filter:
filter("/*").through(MyFilter.class);

注意�Q�每�?servlet �?filter 都必��L�� @Singleton�Q�必��d��标注或�?module 里面指明�Q�所有不�?Singleton �?scope 都是错误。这�?Servlet 的规范一致�?br />
安装�?ServletModule 模块后，��M�� Guice 注入的实例都可以被注入下面的对象�Q?br />

@RequestScoped
class SomeNonServletPojo {

  @Inject
  public SomeNonServletPojo(HttpServletRequest request, HttpServletResponse response, HttpSession session) {

  }

}

此外�Q�http��h��的参数可以如此注入： @Inject @RequestParameters Map params;

分配��序�Q?br />
filter �?servlet ��会按照�?nbsp;ServletModule 里面出现的顺序分配�?br />
此外�Q�可以一�ơ匹配多个�\径： serve("*.html", "/my/*").with(MyServlet.class);

正则文法匚w��Q�serveRegex("(.)*ajax(.)*").with(MyAjaxServlet.class)

指定初始化参敎ͼ�

  Map<String, String> params = new HashMap<String, String>();
  params.put("coffee", "Espresso");
  params.put("site", "google.com");


      serve("/*").with(MyServlet.class, params)

�q�些参数可以�?getInitParams 得到�?br />
其他高��Ҏ��省略不再讨论�?br />
部分�Q?�Q�：GUICE �?nbsp;Vaadin 集成

http://vaadin.com/wiki/-/wiki/Main/Integrating Vaadin with Guice 2.0

首先�Q�下�?guice-2.0.jar, guice-servlet-2.0.jar, aopalliance.jar�Q�将�q�些包拷贝到 WebContent/WEB-INF/lib/ 目录�?br />

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;

import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.vaadin.Application;
import com.vaadin.terminal.gwt.server.AbstractApplicationServlet;

@Singleton
public class GuiceApplicationServlet extends AbstractApplicationServlet {

    protected final Provider<Application> applicationProvider;

    @Inject
    public GuiceApplicationServlet(Provider<Application> applicationProvider) {
        this.applicationProvider = applicationProvider;
    }

    @Override
    protected Class getApplicationClass() throws ClassNotFoundException {
        return Application.class;
    }

    @Override
    protected Application getNewApplication(HttpServletRequest request) throws ServletException {
        return applicationProvider.get();
    }

}

上面�q�个class 可以直接拯��到项目中不需要改变。Provider �?Guice 注入�Q��ؓ每个用户创徏一�?Application 实例�?br />
下面是一个简单的 Application 的例子。其中参�?text 是被注入的�?br />

#!java
import com.google.inject.Inject;
import com.google.inject.name.Named;
import com.vaadin.Application;
import com.vaadin.ui.Label;
import com.vaadin.ui.Window;

public class MyApplication extends Application {

    @Inject @Named("welcome") protected String text;

    @Override
    public void init() {
        Window window = new Window();
        window.addComponent(new Label(text));

        setMainWindow(window);
    }

}

初始化，需要写一�?Guice �?GuiceServletContextListener来配�|?ServletModule�Q�配�|?Servlet�Q�Application�Q�以及其�?Guice ��理的实例，比如上面例子用到�?text�?br />

#!java
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.name.Names;
import com.google.inject.servlet.GuiceServletContextListener;
import com.google.inject.servlet.ServletModule;
import com.google.inject.servlet.ServletScopes;
import com.vaadin.Application;

public class MyServletConfig extends GuiceServletContextListener {

    @Override
    protected Injector getInjector() {

        ServletModule module = new ServletModule() {
            @Override
            protected void configureServlets() {
                serve("/*").with(GuiceApplicationServlet.class);

                bind(Application.class).to(MyApplication.class).in(ServletScopes.SESSION);
                bindConstant().annotatedWith(Names.named("welcome")).to("This is my first Vaadin/Guice Application");
            }
        };

        Injector injector = Guice.createInjector(module);

        return injector;
    }
}

web.xml 需要如此配�|�，来启�?Guice Filter 和上面的那个配置模块 (Listener)

<web-app>



  <filter>
     <filter-name>guiceFilterfilter-name>
     <filter-class>com.google.inject.servlet.GuiceFilterfilter-class>
  filter>

  <filter-mapping>
     <filter-name>guiceFilterfilter-name>
     <url-pattern>/*url-pattern>
  filter-mapping>

  <listener>
     <listener-class>de.timedout.vaadin.guice.MyServletConfiglistener-class>
  listener>

web-app>

bing 2010-03-16 15:05 发表评论

关于 Vaadin / Hibernate 应用开发的�l�构的考虑

bing — Wed, 06 Jan 2010 03:41:00 GMT

摘要: 关于 vaadin 应用的构架的思考。特别是�l�合 hibernate 以及 hibernate validate 阅读全文

bing 2010-01-06 11:41 发表评论

Exploring Vaadin (6) - summary of several classes

bing — Wed, 30 Dec 2009 06:05:00 GMT

摘要: Something about:
Abstract Class PropertyFormatter
Abstract Class AbstractSelect
Interface FormFieldFactory
Abstract Class AbstractField 阅读全文

bing 2009-12-30 14:05 发表评论

Exploring Vaadin (4) 阅读 com.vaadin.data.util.MethodProperty 源代�?

bing — Wed, 23 Dec 2009 09:35:00 GMT

摘要: 阅读 com.vaadin.data.util.MethodProperty 源代码的�W�记。阅�?MethodProperty 的目的是因�ؓ�q�个�c�L�� Property�Q�同时处�?Bean 的属性。本以�ؓ可能会牵扯到 Vaadin 处理�c�d��转换的地方，可以了解一�?Vaadin 是如何操作的。结果发现错了。应该看�?com.vaadin.data.util.PropertyFormatter �Q�才是用来进行类型�{换的�?nbsp; 阅读全文

bing 2009-12-23 17:35 发表评论

Exploring Vaadin (2) - Vaadin + Hibernate discussions on Internet

bing — Wed, 16 Dec 2009 07:52:00 GMT

摘要: Study of discussions on Internet about Vaadin + Hibernate 阅读全文

bing 2009-12-16 15:52 发表评论

Exploring Vaadin (1) - Data

bing — Fri, 11 Dec 2009 10:35:00 GMT

摘要: This article examines com.vaadin.data pacakge - the data source model for vaadin - and provide a summary. It also examine the relationship between data source and some UI classes.
阅读全文

bing 2009-12-11 18:35 发表评论

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关于 Vaadin / Hibernate 应用开发的�l�构的考虑

Exploring Vaadin (6) - summary of several classes

Exploring Vaadin (4) 阅读 com.vaadin.data.util.MethodProperty 源代�?

Exploring Vaadin (2) - Vaadin + Hibernate discussions on Internet

Exploring Vaadin (1) - Data