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About Boris Lam

Boris Lam
Boris is an experienced Java developer with in Hong Kong. His expertise is in Java EE technology, object-oriented application development, and the use of open source frameworks (e.g. Spring , Apache MyFaces). In recent years, he is primarily involved in framework development and architectural design in serveral Government related software development projects.

Lightweight Web Application Framework: PrimeFaces (JSF) + Guice + MyBatis (Part 2)

In this part, I will continue to demonstrate the integration of JSF, Guice and MyBatis. DBCP connection pool and MYSQL database is used in persistence layer. Take a look at Part 1.

Integrate Google Guice with MyBatis

In the previous post, we have created a ServletContextListener. Now, we just bind the BasicDataSourceProvider and JdbcTransactionFactory in the contextInitialized method.

GuiceContextListener.java

package org.borislam;

import java.util.Properties;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
import org.apache.log4j.xml.DOMConfigurator;
import org.borislam.mapper.StaffMapper;
import org.borislam.service.SimpleService;
import org.borislam.service.impl.SimpleServiceImpl;
import org.mybatis.guice.MyBatisModule;
import org.mybatis.guice.datasource.dbcp.BasicDataSourceProvider;
import org.mybatis.guice.datasource.helper.JdbcHelper;

import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Singleton;
import com.google.inject.name.Names;

public class GuiceContextListener implements ServletContextListener {

   public void contextDestroyed(ServletContextEvent servletContextEvent) {
     ServletContext servletContext = servletContextEvent.getServletContext();
     servletContext.removeAttribute(Injector.class.getName());
   }

   public void contextInitialized(ServletContextEvent servletContextEvent) {
     Injector injector = Guice.createInjector(
       new MyBatisModule() {
        @Override
        protected void initialize() {         
         install(JdbcHelper.MySQL);

         environmentId('development');
                        bindDataSourceProviderType(BasicDataSourceProvider.class);
         bindTransactionFactoryType(JdbcTransactionFactory.class);
         Names.bindProperties(binder(), createServerProperties());

         //add singleton service class
         bind(SimpleService.class).to(SimpleServiceImpl.class).in(Singleton.class); 

         //add MyBatis Service class
         addMapperClass(StaffMapper.class);
         }
        }
       );

     ServletContext servletContext = servletContextEvent.getServletContext();
     servletContext.setAttribute(Injector.class.getName(), injector);

     //log4J
  DOMConfigurator.configure(
    Thread.currentThread().getContextClassLoader()
     .getResource('log4j.xml')
    );
   }

   protected static Properties createServerProperties() {
         Properties myBatisProperties = new Properties();

         myBatisProperties.setProperty('JDBC.host', 'localhost');
         myBatisProperties.setProperty('JDBC.port', '3306');
         myBatisProperties.setProperty('JDBC.schema', 'ttcoach');

         myBatisProperties.setProperty('JDBC.username', 'root');
         myBatisProperties.setProperty('JDBC.password', '');
         myBatisProperties.setProperty('JDBC.autoCommit', 'false');
         return myBatisProperties;
   }

}

Prepare your MyBatis mapper class and model class

Staff.java

package org.borislam.model;

public class Staff {
 private String code;
 private String name;
 private String sex;
 private String tel;
 public String getCode() {
  return code;
 }
 public void setCode(String code) {
  this.code = code;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public String getSex() {
  return sex;
 }
 public void setSex(String sex) {
  this.sex = sex;
 }

 public String getTel() {
  return tel;
 }
 public void setTel(String tel) {
  this.tel = tel;
 } 

}

StaffMapper.java

package org.borislam.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.borislam.model.Staff;

public interface StaffMapper {
    final String SELECT_ALL = 'SELECT * FROM FREELANCER';
    final String SELECT_BY_CODE = 'SELECT * FROM FREELANCER WHERE CODE = #{code}';

    /**
     * Returns the list of all Freelancer instances from the database.
     * @return the list of all Freelancer instances from the database.
     */
    @Select(SELECT_ALL)
    @Results(value = {
        @Result(property='code', column='code'),
        @Result(property='name', column='name'),
        @Result(property='sex', column='sex'),
        @Result(property='tel', column='tel')
    })
    List<Staff> selectAll();

    /**
     * Returns a Freelancer instance from the database.
     * @param id primary key value used for lookup.
     * @return A Freelancer instance with a primary key value equals to pk. null if there is no matching row.
     */
    @Select(SELECT_BY_CODE)
    @Results(value = {
            @Result(property='code', column='code'),
            @Result(property='name', column='name'),
            @Result(property='sex', column='sex'),
            @Result(property='tel', column='tel')
    })
    Staff selectByCode(String code);
}

Prepare your Service Class

SimpleService.java

package org.borislam.service;

public interface SimpleService {
 public void doSimpleThing();
}

SimpleServiceImpl.java

package org.borislam.service.impl;

import java.util.List;

import org.borislam.mapper.StaffMapper;
import org.borislam.model.Staff;
import org.borislam.service.SimpleService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.inject.Inject;

public class SimpleServiceImpl implements SimpleService {

 private StaffMapper staffMapper;

 Logger logger = LoggerFactory.getLogger(this.getClass());

 @Inject
 public void setStaffMapper(StaffMapper staffMapper) {
  this.staffMapper = staffMapper;
 }

 public void doSimpleThing() {
  List<Staff> staffList = staffMapper.selectAll();
  logger.debug('size 1: ' + staffList.size());

  Staff staff = staffMapper.selectByCode('c001');
  logger.debug('Code1 : ' + staff.getCode());
  logger.debug('Name 1: ' + staff.getName());;
 }
}

Prepare your JSF Backing Bean and xhtml page

TestBean.java

package org.borislam.view;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.inject.Inject;
import org.borislam.service.SimpleService;
import org.borislam.service.TestService;

@ManagedBean
@SessionScoped
public class TestBean extends BasePageBean {

 private SimpleService sService;

 @Inject
 public void setsService(SimpleService sService) {
  this.sService = sService;
 }

 public String doTest(){
  System.out.println('test 1 inside backing bean...');
  sService.doSimpleThing();
  return '';
 }

 public String doTest2(){
  System.out.println('test 2 inside backing bean...');
  sService.doSimpleThing();
  return '';
 }
}

index.xhtml

<html xmlns='http://www.w3c.org/1999/xhtml'
xmlns:h='http://java.sun.com/jsf/html'
xmlns:p='http://primefaces.org/ui'>
<h:head>
<style>
.ui-widget, .ui-widget .ui-widget {
font-size: 80% !important;
}
</style>
</h:head>
<h:body>
<h:form>
 <h:outputText value='#{msg['website.title']}' />
    <p:calendar id='popupButtonCal' showOn='button' />
    <p:commandButton value='TEST2' action='#{testBean.doTest}'/>
 <p:editor/>
 <br/>
</h:form>
</h:body>
</html>

 
That’s done! You can now ready to write your JSF application based on this framework.
Reference: Lightweight Web Application Framework: PrimeFaces (JSF) + Guice + MyBatis (PART 2) from our JCG partner Boris Lam at the Programming Peacefully blog.

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