Liferay开发实战(2):Service Builder生成持久化层,及开发服务层

本文Liferay适用版本:v6.2.ce-ga6版

 

Liferay的插件体系是:模型-视图-控制器的portlet MVC框架。
MVC是一个伟大的用于Web应用程序的设计模式,在实际应用中还应处理持久化,它可以用于检索、处理或显示。为此你需要添加更多的层:一个持久层和服务层。
持久层负责保存和检索模型数据。服务层就像你的应用程序和持久层之间的缓冲区:在将来,它会给你自由的自由,即在不修改任何内容的情况下,哪怕是就算将来有一天你替换掉整个持久层。松耦合是良好的应用程序设计,并在Liferay框架中支持。它通过Service Builder(服务生成器)生成。

Service Builder的特性:

  • 自动生成模型,持久性和服务层
  • 自动生成本地和远程服务
  • 自动生成Hibernate和Spring的配置
  • 根据帐户的权限生成查找方法的实体和查找方法
  • 内置实体缓存(entity caching)支持
  • 自定义的SQL查询和动态查询的支持
  • 节省开发时间

你只需要生成一个 service.xml 文件,再运行 Service Builder ,这将生成一个新的 service .jar 文件,新文件包括模型层、持久层、服务层等文件。

通过服务生成器生成的远程服务包括SOAP或JSON访问。

另一种节省开发时间的方式是通过Spring和Hibernate的配置你的项目。业务生成器使用Spring的依赖注入使服务实现类可在运行时使用Spring AOP的事务管理。

 

生成方法。点击当前Liferay项目》 New → Liferay Service Builder

服务生成器的界面

 

配置文件的格式:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE service-builder PUBLIC "-//Liferay//DTD Service Builder 6.2.0//EN" "http://www.liferay.com/dtd/liferay-service-builder_6_2_0.dtd">
<service-builder package-path="com.liferay.docs.guestbook">
    <author>wangxin</author>
    <namespace>GB</namespace>

    <entity name="Guestbook" local-service="true">

        <!-- PK fields -->

        <column name="guestbookId" type="long" primary="true"></column>

        <!-- Group instance -->

        <column name="groupId" type="long"></column>

        <!-- Audit fields -->

        <column name="companyId" type="long"></column>
        <column name="userId" type="long"></column>
        <column name="userName" type="String"></column>
        <column name="createDate" type="Date"></column>
        <column name="modifiedDate" type="Date"></column>
        <column name="name" type="String"></column>
    </entity>
    <entity name="Entry">

        <!-- PK fields -->

        <column name="entryId" type="long" primary="true"></column>

        <!-- Group instance -->

        <column name="groupId" type="long"></column>

        <!-- Audit fields -->

        <column name="companyId" type="long"></column>
        <column name="userId" type="long"></column>
        <column name="userName" type="String"></column>
        <column name="createDate" type="Date"></column>
        <column name="modifiedDate" type="Date"></column>
        <column name="name" type="String"></column>
        <column name="email" type="String"></column>
        <column name="message" type="String"></column>
        <column filter-primary="false" name="guestbookId" primary="false" type="long"></column>
    </entity>
    <exceptions>
        <exception>GuestbookName</exception>
        <exception>EntryName</exception>
        <exception>EntryMessage</exception>
        <exception>EntryEmail</exception>
    </exceptions>
</service-builder>

 

当你写一个系统应用,例如,如果你为两个不同的站点添加一个Wiki,每个wiki的数据是根据每个站点而不同。换句话说,一个网站没有访问另一个网站的数据,但应用程序都相同。这是数据范围的概念。
在Liferay Portal的数据范围有一个层次,在下图描述。

在这里,你可以看到2个门户实例。每一个都是完全独立的门户,不同的用户、网站。在左边的门户实例中描述了2个用户:一个用户是一个独立站点的成员,而另一个用户是一个组织的成员,它本身有一个站点。

 

 默认字段 Company ID,Group ID,User ID 就是提供了数据范围的支持。

然后创建Finders

创建后的代码:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE service-builder PUBLIC "-//Liferay//DTD Service Builder 6.2.0//EN" "http://www.liferay.com/dtd/liferay-service-builder_6_2_0.dtd">
<service-builder package-path="com.liferay.docs.guestbook">
    <author>wangxin</author>
    <namespace>GB</namespace>

    <entity name="Guestbook" local-service="true">

        <!-- PK fields -->

        <column name="guestbookId" type="long" primary="true"></column>

        <!-- Group instance -->

        <column name="groupId" type="long"></column>

        <!-- Audit fields -->

        <column name="companyId" type="long"></column>
        <column name="userId" type="long"></column>
        <column name="userName" type="String"></column>
        <column name="createDate" type="Date"></column>
        <column name="modifiedDate" type="Date"></column>
        <column name="name" type="String"></column>
        <finder name="GroupId" return-type="Collection">
            <finder-column name="groupId"></finder-column>
        </finder>
    </entity>
    <entity name="Entry">

        <!-- PK fields -->

        <column name="entryId" type="long" primary="true"></column>

        <!-- Group instance -->

        <column name="groupId" type="long"></column>

        <!-- Audit fields -->

        <column name="companyId" type="long"></column>
        <column name="userId" type="long"></column>
        <column name="userName" type="String"></column>
        <column name="createDate" type="Date"></column>
        <column name="modifiedDate" type="Date"></column>
        <column name="name" type="String"></column>
        <column name="email" type="String"></column>
        <column name="message" type="String"></column>
        <column filter-primary="false" name="guestbookId" primary="false" type="long"></column>
        <finder name="G_G" return-type="Collection">
            <finder-column name="groupId"></finder-column>
            <finder-column name="guestbookId"></finder-column>
        </finder>
    </entity>
    <exceptions>
        <exception>GuestbookName</exception>
        <exception>EntryName</exception>
        <exception>EntryMessage</exception>
        <exception>EntryEmail</exception>
    </exceptions>
</service-builder>
View Code

 

并且编译:

 

Liferay的代码生成器生成了持久化层代码,但控制器、服务层、视图层的具体实现需要开发人员自己做,这样保证了极大的灵活性。

ServiceContext 是Liferay提供上下文访问的核心类,真的是非常强大:

 

视图层的一些代码,AUI是YUI的扩展。

<%@include file = "/html/init.jsp" %>

<portlet:renderURL var="viewURL">
    <portlet:param name="mvcPath" value="/html/guestbook/view.jsp"></portlet:param>
</portlet:renderURL>

<portlet:actionURL name="addGuestbook" var="addGuestbookURL"></portlet:actionURL>

<aui:form action="<%= addGuestbookURL %>" name="<portlet:namespace />fm">

        <aui:fieldset>

            <aui:input name="name" />

        </aui:fieldset>

        <aui:button-row>

            <aui:button type="submit"></aui:button>
            <aui:button type="cancel" onClick="<%= viewURL %>"></aui:button>

        </aui:button-row>
</aui:form>

 

前端界面

 

 

控制器代码

package com.liferay.docs.guestbook.portlet;

import com.liferay.docs.guestbook.model.Entry;
import com.liferay.docs.guestbook.model.Guestbook;
import com.liferay.docs.guestbook.service.EntryLocalServiceUtil;
import com.liferay.docs.guestbook.service.GuestbookLocalServiceUtil;
import com.liferay.portal.kernel.exception.PortalException;
import com.liferay.portal.kernel.exception.SystemException;
import com.liferay.portal.kernel.servlet.SessionErrors;
import com.liferay.portal.kernel.servlet.SessionMessages;
import com.liferay.portal.kernel.util.ParamUtil;
import com.liferay.portal.service.ServiceContext;
import com.liferay.portal.service.ServiceContextFactory;
import com.liferay.portal.util.PortalUtil;
import com.liferay.util.bridges.mvc.MVCPortlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.PortletException;
import javax.portlet.PortletPreferences;
import javax.portlet.ReadOnlyException;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import javax.portlet.ValidatorException;

import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Portlet implementation class GuestbookPortlet
 */
public class GuestbookPortlet extends MVCPortlet {
    
 
    public void addGuestbook(ActionRequest request, ActionResponse response)
            throws PortalException, SystemException {

        ServiceContext serviceContext = ServiceContextFactory.getInstance(
            Guestbook.class.getName(), request);

        String name = ParamUtil.getString(request, "name");

        try {
            GuestbookLocalServiceUtil.addGuestbook(serviceContext.getUserId(),
                    name, serviceContext);

            SessionMessages.add(request, "guestbookAdded");

        } catch (Exception e) {
            SessionErrors.add(request, e.getClass().getName());

            response.setRenderParameter("mvcPath",
                "/html/guestbook/edit_guestbook.jsp");
        }

    }
    
    public void addEntry(ActionRequest request, ActionResponse response)
            throws PortalException, SystemException {

        ServiceContext serviceContext = ServiceContextFactory.getInstance(
                Entry.class.getName(), request);

        String userName = ParamUtil.getString(request, "name");
        String email = ParamUtil.getString(request, "email");
        String message = ParamUtil.getString(request, "message");
        long guestbookId = ParamUtil.getLong(request, "guestbookId");

        try {
            EntryLocalServiceUtil.addEntry(serviceContext.getUserId(),
                    guestbookId, userName, email, message, serviceContext);

            SessionMessages.add(request, "entryAdded");

            response.setRenderParameter("guestbookId",
                    Long.toString(guestbookId));

        } catch (Exception e) {
            SessionErrors.add(request, e.getClass().getName());

            PortalUtil.copyRequestParameters(request, response);

            response.setRenderParameter("mvcPath",
                    "/html/guestbook/edit_entry.jsp");
        }

    }

    @Override
    public void render(RenderRequest renderRequest,
            RenderResponse renderResponse) throws PortletException, IOException {

        try {
            ServiceContext serviceContext = ServiceContextFactory.getInstance(
                    Guestbook.class.getName(), renderRequest);

            long groupId = serviceContext.getScopeGroupId();

            long guestbookId = ParamUtil.getLong(renderRequest, "guestbookId");

            List<Guestbook> guestbooks = GuestbookLocalServiceUtil
                    .getGuestbooks(groupId);

            if (guestbooks.size() == 0) {
                Guestbook guestbook = GuestbookLocalServiceUtil.addGuestbook(
                        serviceContext.getUserId(), "Main", serviceContext);

                guestbookId = guestbook.getGuestbookId();

            }

            if (!(guestbookId > 0)) {
                guestbookId = guestbooks.get(0).getGuestbookId();
            }

            renderRequest.setAttribute("guestbookId", guestbookId);

        } catch (Exception e) {

            throw new PortletException(e);
        }

        super.render(renderRequest, renderResponse);

    }
    

}
View Code

 

 

完整代码下载 Source Code

 

posted @ 2016-02-01 16:27  昕友软件开发  阅读(2545)  评论(0编辑  收藏  举报
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