java - 如何使用Liferay从MySQL检索jsp中的数据？

Question

我想从mysql中检索数据并向其中插入数据。

我提供了3个文件，一个java文件和两个jsp文件edit.jsp和view.jsp分别用于编辑和查看数据。

我已经使用ServiceBuilder创建了表，我已将portal-ext.properties放在classes文件夹中，请告诉我这是完美的方法吗？我的做法正确吗？

我想先插入数据，然后从数据库中检索数据。

1. 我通过以下 jsp 文件插入数据 - edit.jsp

   <%@ taglib uri="http://java.sun.com/portlet" prefix="portlet" %>
   
   <jsp:useBean class="java.lang.String" id="addNameURL" scope="request" />
   <jsp:useBean class="java.lang.String" id="area" scope="request"/>
   <jsp:useBean class="java.lang.String" id="email" scope="request"/>
   <jsp:useBean class="java.lang.String" id="subject" scope="request"/>
   <jsp:useBean class="java.lang.String" id="compnay" scope="request"/>
   <jsp:useBean class="java.lang.String" id="designation" scope="request"/>
   
   <portlet:defineObjects />
   
   <form id="<portlet:namespace />helloForm" action="<%= addNameURL %>"method="post">
       <table>
           <tr>
               <td>Subject:</td>
               <td><input type="text" name="subject"></td>
           </tr>
           <tr>
               <td>
               Write Your Testimonial
               </td>
               <td><textarea name ="area"></textarea>
               </td>
           </tr>
           <tr>
               <td>Name:</td>
               <td><input type="text" name="username"></td>
           </tr>
           <tr>
               <td>Email:</td>
               <td><input type="text" name="email"></td>
           </tr>
           <tr>
               <td>Company:</td>
               <td><input type="text" name="company"></td>
           </tr>
           <tr>
               <td>Designation:</td>
               <td><input type="text" name="designation"></td>
           </tr>
       </table>
   
       <input type="submit" id="nameButton" title="Submit" value="Submit">
   </form>
   

2. 我已在以下 java 文件中编写了插入逻辑 - Testimonial1:

   package com.liferay.portlet;
   
   import java.io.IOException;
   import javax.portlet.ActionRequest;
   import javax.portlet.ActionResponse;
   import javax.portlet.GenericPortlet;
   import javax.portlet.PortletException;
   import javax.portlet.PortletMode;
   import javax.portlet.PortletPreferences;
   import javax.portlet.PortletRequestDispatcher;
   import javax.portlet.PortletURL;
   import javax.portlet.RenderRequest;
   import javax.portlet.RenderResponse;
   import org.apache.commons.logging.Log;
   import org.apache.commons.logging.LogFactory;
   import com.liferay.counter.service.CounterLocalServiceUtil;
   import com.liferay.portal.kernel.exception.SystemException;
   import com.liferay.portlet.model.testimonial;
   import com.liferay.portlet.service.testimonialLocalServiceUtil;
   
   public class Testimonial1 extends GenericPortlet {
   
       public void init()throws PortletException 
       {
           editJSP = getInitParameter("edit-jsp");
           viewJSP = getInitParameter("view-jsp");
       }
   
       public void doEdit(RenderRequest renderRequest,RenderResponse renderResponse)
               throws  IOException, PortletException 
       {
           renderResponse.setContentType("text/html");
           PortletURL addNameURL = renderResponse.createActionURL();
           addNameURL.setParameter("addName", "addName");
           renderRequest.setAttribute("addNameURL", addNameURL.toString());
           include(editJSP, renderRequest, renderResponse);
       }
   
       public void doView(RenderRequest renderRequest,RenderResponse renderResponse)throws 
       IOException, PortletException
       {
           PortletPreferences prefs = renderRequest.getPreferences();
           String username = (String) prefs.getValue("name", "");
           String area=(String)prefs.getValue("area", "testimonial");
           String email=(String)prefs.getValue("email", "");
           String subject=(String)prefs.getValue("subject", "");
           String company=(String)prefs.getValue("company", "");
           String designation=(String)prefs.getValue("designation", "");
   
       if (username.equalsIgnoreCase ("")) 
       {
           username = "";
       }
           renderRequest.setAttribute("userName", username);
           renderRequest.setAttribute("area",area);
           renderRequest.setAttribute("email",email);
           renderRequest.setAttribute("subject",subject);
           renderRequest.setAttribute("designation",designation);
           renderRequest.setAttribute("company",company);
   
           include(viewJSP, renderRequest, renderResponse);
       }
   
       public void processAction(ActionRequest actionRequest, ActionResponse actionResponse)
               throws IOException, PortletException 
       {
           String addName = actionRequest.getParameter("addName");
   
           if (addName != null)
           {
               PortletPreferences prefs = actionRequest.getPreferences();
               prefs.setValue("name", actionRequest.getParameter("username"));
               prefs.setValue("area",actionRequest.getParameter("area"));
               prefs.setValue("email",actionRequest.getParameter("email"));
               prefs.setValue("subject",actionRequest.getParameter("subject"));
               prefs.setValue("designation",actionRequest.getParameter("designation"));
               prefs.setValue("company",actionRequest.getParameter("company"));
   
               prefs.store();
   
               testimonial testimonial = null;
   
               try {
                   testimonialLocalServiceUtil.createtestimonial(CounterLocalServiceUtil.increment());
                   testimonial.setSubject(actionRequest.getParameter("subject"));
                   testimonial.setArea(actionRequest.getParameter("area"));
                   testimonial.setUsername(actionRequest.getParameter("username"));
                   testimonial.setEmail(actionRequest.getParameter("email"));
                   testimonial.setCompany(actionRequest.getParameter("company"));
                   testimonial.setDesignation(actionRequest.getParameter("designation"));
                   testimonialLocalServiceUtil.addtestimonial(testimonial);
               } catch (SystemException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               }
   
               actionResponse.setPortletMode(PortletMode.VIEW);    
           }
       }
   
       protected void include(String path, RenderRequest renderRequest, RenderResponse renderResponse)
               throws IOException, PortletException 
       {
           PortletRequestDispatcher portletRequestDispatcher = getPortletContext().getRequestDispatcher(path);
   
           if (portletRequestDispatcher == null) 
           {
               _log.error(path + " is not a valid include");
           }
           else
           {
               portletRequestDispatcher.include(renderRequest, renderResponse);
           }
       }
       protected String editJSP;
       protected String viewJSP;
       private static Log _log = LogFactory.getLog(Testimonial1.class);
   }
   

3. 我已在以下文件中编写了 View 逻辑 - view.jsp，并且我想从以下文件中的数据库检索数据:

   <%@ taglib uri="http://java.sun.com/portlet" prefix="portlet" %>
   
   <jsp:useBean id="subject" class="java.lang.String" scope="request"/>
   <jsp:useBean id="area" class="java.lang.String" scope="request"/>
   <jsp:useBean id="userName" class="java.lang.String" scope="request" />
   <jsp:useBean id="email" class="java.lang.String" scope="request"/>
   <jsp:useBean id="company" class="java.lang.String" scope="request"/>
   <jsp:useBean id="designation" class="java.lang.String" scope="request"/>
   <portlet:defineObjects />
   
   <p>This is the Testimonial portlet......... how are u all ..........</p>
   
   <p>Subject is ....<%=subject %></p>
   <p>Testimonial is .....<%=area %></p>
   <p>Hello <%= userName %>!</p>
   <p>your Email ......<%=email %></p>
   <p>your company .....<%=company %></p>
   <p>You are .......<%=designation %></p>
   

4. 我的 service.xml 文件

   <?xml version="1.0" encoding="UTF-8"?>
   <!DOCTYPE service-builder PUBLIC "-//Liferay//DTD Service Builder 6.1.0//EN"  "http://www.liferay.com/dtd/liferay-service-builder_6_1_0.dtd">
   
   <service-builder package-path="com.liferay.portlet">
       <author>ubuntu</author>
       <namespace>perception</namespace>
   
       <entity name="testimonial" local-service="true" remote-service="true">
           <column name="subject" type="String"></column>
           <column name="area" type="String"></column>
           <column name="username" type="String"></column>
           <column name="email" type="String"></column>
           <column name="company" type="String"></column>
           <column name="designation" type="String"></column>
       </entity>
   </service-builder>
   

5. 我的portal-ext.properties 文件:

   #
   # MySQL 
   #
   
   jdbc.default.driverClassName=com.mysql.jdbc.Driver 
   jdbc.default.url=jdbc:mysql://localhost/lportal?useUnicode=true&characterEn
   coding=UTF-8&useFastDateParsing=false
   jdbc.default.username=root
   jdbc.default.password=ubuntu123
   
   schema.run.enabled=true
   schema.run.minimal=true
   

我已经放置了所有文件，现在请告诉我如何进行数据插入和检索。

请告诉我插入代码是否正确？以及如何从数据库中检索数据？

Answer 1

你可以看看liferay的服务构建器。

• http://www.liferay.com/community/wiki/-/wiki/Main/Service+Builder

• http://www.liferay.com/documentation/liferay-portal/6.0/development/-/ai/service-build-2

如果您的数据与liferay不在同一个数据库中，您仍然可以使用服务构建器

• http://liferaytrends.blogspot.com/2012/05/blog-post.html