Programming

Karena kebutuhan project yang mengharuskan gw bikin aplikasi RIA yang jalan diatas browser, gw terpaksa cari-cari framework AJAX yang cepet jadinya dan bagus tampilannya. ZKoss adalah pilihan pertama gw, kebetulan background gw Java jadinya ga terlalu sulit codingin si ZKoss ini.

Disini gw akan coba bikin aplikasi CRUD sederhana banget, antara ZKoss sebagai UI-nya, MySQL sebagai databasenya dan Hibernate buat menghubungkan keduanya. IDE yg gw pakek adalah Netbeans dan Webserver gw Apache Tomcat.

Kita mulai dengan struktur database gw,
nama database “test”, nama table “person”.

CREATE TABLE person
(
        name VARCHAR(20) NOT NULL,
        gender VARCHAR(10),
        birthdate DATE,
        age INT,
        PRIMARY KEY (name)
)

insert into person (name, gender, birthdate, age) values ('Christian Gonzales', 'Male', '1988-12-24', 29);
insert into person (name, gender, birthdate, age) values ('Firman Utina', 'Male', '1977-11-20', 28);
insert into person (name, gender, birthdate, age) values ('Irfan Bachdim', 'Male', '1990-01-01', 19);
insert into person (name, gender, birthdate, age) values ('Julia Perez', 'Female', '1966-04-18', 64);

Kemudian javabean dan hibernate xml-nya.

package com.baculsoft.zk.bean;

import java.util.Date;

public class Person {
    
    private String name;
    private int age;
    private String gender;
    private Date birthdate;

    public Person(String name, int age, String gender, Date birthdate) {
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.birthdate = birthdate;
    }

    public Person() {
    }    

    // other setter getter

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
  <class catalog="test" name="com.baculsoft.zk.bean.Person" table="person">
    <id name="name" type="string">
      <column length="20" name="name"/>
      <generator class="assigned"/>
    </id>
    <property name="gender" type="string">
      <column length="10" name="gender"/>
    </property>
    <property name="birthdate" type="date">
      <column length="10" name="birthdate"/>
    </property>
    <property name="age" type="java.lang.Integer">
      <column name="age"/>
    </property>
  </class>
</hibernate-mapping>

Jangan sampe lupa settingan hibernate.cfg.xml-nya yeh.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">password</property>
    <property name="hibernate.connection.autocommit">true</property>
    <property name="hibernate.show_sql">true</property>
    <mapping resource="com/baculsoft/zk/bean/Person.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

abis itu gw bikin class PersonDAO buat handle transaksi ke db

package com.baculsoft.zk.dao;

import com.baculsoft.zk.bean.Person;
import java.util.List;
import org.hibernate.Session;

// disini pake hibernate util bawaan zkoss
import org.zkoss.zkplus.hibernate.HibernateUtil;

public class PersonDAO {

    public List<Person> findAll() throws Exception {
        Session session = HibernateUtil.getSessionFactory().openSession();
        return (List<Person>) session.createCriteria(Person.class).list();
    }

    public boolean delete(Person person) throws Exception {
        if (person == null) {
            throw new Exception("empty person");
        }
        Session session = HibernateUtil.getSessionFactory().openSession();
        session.delete(person);
        session.flush();
        session.close();
        return true;
    }

    public boolean insert(Person person) throws Exception {
        if (person == null) {
            throw new Exception("empty person");
        }
        Session session = HibernateUtil.getSessionFactory().openSession();
        session.save(person);
        session.flush();
        session.close();
        return true;
    }

    public boolean update(Person person) throws Exception {
        if (person == null) {
            throw new Exception("empty person");
        }
        Session session = HibernateUtil.getSessionFactory().openSession();
        session.update(person);
        session.flush();
        session.close();
        return true;
    }
}

nah, ini class Service adalah salah satu class yang paling diperlukan, coba cek baris ke 34, 43 dan 51. Itu method2 jadi semacem “listener” buat “event” yang terjadi di aplikasi.

package com.baculsoft.zk.service;

import com.baculsoft.zk.bean.Person;
import com.baculsoft.zk.dao.PersonDAO;
import java.util.List;
import org.apache.log4j.Logger;
import org.zkoss.zk.ui.util.GenericForwardComposer;

public class PersonService extends GenericForwardComposer {

    private PersonDAO dao = new PersonDAO();
    private Person person = new Person();
    
    private Logger logger = Logger.getLogger(PersonService.class);

    public Person getCurrent() {
        return person;
    }

    public void setCurrent(Person person) {
        this.person = person;
    }

    public List<Person> getAllPersons() {
        try {
            return dao.findAll();
        } catch (Exception ex) {
            logger.error(ex.getMessage(), ex);
            return null;
        }

    }

    public void onClick$add() {
        try {
            Person nowPerson = new Person(person.getName(), person.getAge(), person.getGender(), person.getBirthdate());
            dao.insert(nowPerson);
        } catch (Exception ex) {
            logger.error(ex.getMessage(), ex);
        }
    }

    public void onClick$update() {
        try {
            dao.update(person);
        } catch (Exception ex) {
            logger.error(ex.getMessage(), ex);
        }
    }

    public void onClick$delete() {
        try {
            dao.delete(person);
        } catch (Exception ex) {
            logger.error(ex.getMessage(), ex);
        }
    }
}

berikut ini adalah yang terpenting dari si aplikasi zkoss, yaitu UI-nya. Gw kasih nama “index.zul” (extension .zul bisa diganti sesuka loe di dalem web.xml). Perhatikan baris ke 34, 35 dan 36. Id-nya button harus sama dengan nama method di class PersonService. Dibaris ke 3 adalah class yang didaftarkan sebagai listener.

<?init class="org.zkoss.zkplus.databind.AnnotateDataBinderInit"?>
<window id="win" width="900px" title="Person" border="normal" 
    apply="com.baculsoft.zk.service.PersonService">
    <listbox id="box" multiple="true" rows="5"
        model="@{win$composer.allPersons, load-after='add.onClick, delete.onClick, update.onClick'}"
        selectedItem="@{win$composer.current}">

        <listhead>
            <listheader label="Name" sort="auto(name)"/>
            <listheader label="Age" width="80px" sort="auto(age)" />
            <listheader label="Gender" width="170px" sort="auto(gender)" />
            <listheader label="Birthdate" width="170px" sort="auto(birthdate)" />
        </listhead>

        <listitem self="@{each='person'}" value="@{person}">
            <listcell label="@{person.name}"/>
            <listcell label="@{person.age}"/>
            <listcell label="@{person.gender}"/>
            <listcell label="@{person.birthdate}"/>
        </listitem>

    </listbox>

    <groupbox>
        <caption label="Person" />
        Name: <textbox id="name" cols="25" value="@{win$composer.current.name}" />
        Age: <intbox id="age" cols="1" value="@{win$composer.current.age}" />
        Gender: <combobox id="gender" value="@{win$composer.current.gender}">
                    <comboitem label="Male" description="Alpha Male"/>
                    <comboitem label="Female" description="Girl Power"/>
                    <comboitem label="Others" description="WTF..?!?!"/>
                </combobox>
        Birthdate: <datebox id="birthdate" cols="8" value="@{win$composer.current.birthdate}" />
        <button id="add" label="Add" height="24px"/>
        <button id="update" label="Update" height="24px"/>
        <button id="delete" label="Delete" height="24px"/>
    </groupbox>
</window>

last but not least, komponen terpenting dari aplikasi gw, yaitu web.xml.

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <description><![CDATA[Edw's ZK Application]]></description>
    <display-name>ZKossTest</display-name>

    <listener>
        <description>ZK listener for session cleanup</description>
        <listener-class>org.zkoss.zk.ui.http.HttpSessionListener</listener-class>
    </listener>
    <servlet>
        <description>ZK loader for ZUML pages</description>
        <servlet-name>zkLoader</servlet-name>
        <servlet-class>org.zkoss.zk.ui.http.DHtmlLayoutServlet</servlet-class>

        <init-param>
            <param-name>update-uri</param-name>
            <param-value>/zkau</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>zkLoader</servlet-name>
        <url-pattern>*.zul</url-pattern>
    </servlet-mapping>

    <servlet>
        <description>The asynchronous update engine for ZK</description>
        <servlet-name>auEngine</servlet-name>
        <servlet-class>org.zkoss.zk.au.http.DHtmlUpdateServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>auEngine</servlet-name>
        <url-pattern>/zkau/*</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>index.zul</welcome-file>
    </welcome-file-list>
</web-app>

nanti kalo berhasil dijalankan akan tampil seperti ini di browser,

Berikut adalah struktur project netbeans gw, btw untuk library ZKoss dan Hibernate bisa di download dari web masing-masing.

Btw, contoh project gw bisa di download disini. Ternyata ZKoss ngga terlalu susah kan? (*)