Bai12 Beans

8/3/2019 Bai12 Beans

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GING VIN:

V TN DNG

TRNG CAO NG CNG NGH THNG TIN TP.HCM

NHP MN JAVA

BI 12JAVA BEANS

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PHN 1

TNG QUANJAVABEANS

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KHI NIM JAVA BEANS

Kin trc JavaBean TMda trn m hnh component. Mhnh ny cho php cc nh pht trin phn mm to racc nvphnmm c tn gi l component.

Cc component uc lp ghp vo cc applet, cc ng

dng, cc servlet hoc vo cc component phc tphnbng cc cng c pht trinphnmmtrc quan.

Cc JavaBean component cgi l beans.

Beans c thc thay i, ty bin theo mun. Ta c

th chn beans t toolbox, ko th vo ng dng, hiuchnh hnh vi v dinmoca bean, nhnghastngtc ca bean vi cc bean khc, tch hp beans vo ccngdng, vo applet hoc vo cc beans mi.

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GUI (graphical user interface) Non-visual beans (v dnhmt spelling checker)

Animation applet.

Spreadsheet application.

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Cc beans khc nhau v chc nng v mc ch s dng.Qu trnh lp trnh trong thc tin, chng ta s thy mt sloi beans sau:

CC LOI JAVA BEANS


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MT S KHI NIM TRONG JAVABEANS

Introspection:(phn tch bn trong) dng khm ph cc c imca bean

Properties:l cc c im v din mo v hnh vi ca bean, chngc thay i lc thit k. Cc thuc tnh ca bean c ccintrospector phn tch ri hin th ra gip cho ngi thit k chng

trnh c th thao tc c trn bean. Customization:cu hnh ty bin lc thit k c thc hin nh

thy c cc thuc tnh ca bean. Cc cng c ty bin beannh: property editors, sophisticated bean customizers.

Event:c cc bean dng giao tip vi nhau. Listener bean l

bean nhn events. Source bean l bean pht ra event. Persistence:cho php cc bean lu tr v phc hi cc trng thi

ca chng.

Methods:khng khc g so vi method trong Java.

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TO V S DNGJAVABEAN N GIN

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CC PHN MM CN CI T

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1) Java Standard Development Kit (JDK) version 6.0

- Download ti:http://java.sun.com/javase/downloads/index.jsp

- Hng dn ci t ti:

http://www.javapassion.com/handsonlabs/

javaprogenv/index.html#0.12) NetBeans IDE 6.5

- Download ti:

http://www.netbeans.org/downloads/index.html

- Hng dn ci t ti:http://www.javapassion.com/handsonlabs/

javaprogenv/index.html#0.2
http://www.javapassion.com/handsonlabs/http://www.javapassion.com/handsonlabs/


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TO MT NETBEANS PROJECT

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Chyphnmm NetBeans 6.5 ln.ChnFile t top-level menu richnNew Project.HpthoiNew Projectxuthin.Chn Java trong phn Categories v chn Java Applicationtrong phnProjects.

NhpNext.

Trong vng Name and Location, phn Project Name, nhpchuiBeansExamplet tn cho project.

phnCreate Main Class, nhp vo chuiBeansExample.NhpFinish hon ttvicto project ny.


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TO MT NETBEANS PROJECT (tt)

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TO MT NETBEANS PROJECT (tt)


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VIT FILE SimpleBeanJLabel.java

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SimpleBeanJLabel l mt v d v visual JavaBean.Nhp phi BeansExampleri chn New->Java Class.Quan st thy vng Name and Locationca hp thoi New JavaClassxut hin.


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VIT FILE SimpleBeanJLabel.java (tt) phn Class Name, nhp vo chui SimpleBeanJLabel.

Nhp Finish.


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Quan st sthy c SimpleBeanJLabel.java vamixuthin trong

vng sonthoca NB6.5, vit code cho file ny nh sau:

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VIT FILE SimpleBeanJLabel.java (tt)

/* SimpleBeanJLabel.java*/

import java.awt.Color;

import java.beans.XMLDecoder;

import javax.swing.JLabel;

import java.io.Serializable;

public class SimpleBeanJLabel extends JLabel

implements Serializable {

public SimpleBeanJLabel() {

setText( "Hello world!" );

setOpaque( true );setBackground( Color.RED );

setForeground( Color.YELLOW );

setVerticalAlignment( CENTER );

setHorizontalAlignment( CENTER );

}

}


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VIT FILE SimpleBeanJLabel2.java

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Vi cc bc lm tng t nh SimpleBeanJLabel, ta to tip

SimpleBeanJLabel2.java. SimpleBeanJLabel2 c thm mt thuc tnh(property) ca chnh n l labelType.


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VIT FILE SimpleBeanJLabel2.java(tt)


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Ni dung ca SimpleBeanJLabel2.java nh sau:

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VIT FILE SimpleBeanJLabel2.java(tt)

/* SimpleBeanJLabel2.java*/

public class SimpleBeanJLabel2 extends SimpleBeanJLabel {private String labelType;public String getLabelType() {

return labelType;

}public void setLabelType(String labelType) {this.labelType = labelType;

}}


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TO TP TIN JAR Thc hin Build project va mi to trong NB6.5 s to ra jar file,

bng cch nh sau: nhp phi node BeansExample trong vngProject richn Build (hoc Run), ktqus to ra tp tin jar chaSimpleBeanJLabel bean.

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Trong th mc C:\myjavafxprojects\BeansExample\dist ta thy c tp tin

BeansExample.jar. Xem ni dung ca tp tin jar ny trong NB6.5 nh sau:

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TO TP TIN JAR (tt)


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A BEAN VO BUIDER TOOL

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To mt NetBeans Project mi c tn l BeansUserExample:

Chn File t top-level menu ri chn New Project. Quan st thy hp thoi New Projectxut hin. Chn Java trong vng Categories ri chn Java Application trong

vng Projects.

Nhp Next. Trong vng Name and Location, vng Project Name, ta nhp

chui BeansUserExample. phn Create Main Class, nhp chui BeansUserExample.

Nhp Finish.

Quan st trong NB6.5 ta thy project va mi to lBeansUserExample xut hin trong vng Projects v thy xuthin BeansUserExample.javatrong ca s son tho ca NB6.5


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A BEAN VO BUIDER TOOL(tt)

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Nhp phi BeansUserExample ri chn New/JFrame Form.


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Quan st vng Name and Locationca hp thoi New JFrame Form

va mi xut hin. vng Class Name, nhp chui MyForm. Nhp Finish.


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Quan st thy phn Design view ca MyForm.javac trnh by

gia ca NB6.5 v phn Palette c trnh by bn phi ca NB6.5


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Tip theo l cng on a SimpleBeanJLabel vo Palete: Nhp phivo mt im trng trn Palete, chn tip Palete Manager t pop-upmenu va mi xut hin


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Trong hp thoi Palette Managerva mi xut hin. Chn Add From JAR. Ta ang gn mt file jar c cha cc beans vo palete.

Ta cng c th thc hin cch khc, l chn Add from Project, cch ny scho ta thy cc bean t mt Project.


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Quan st hp thoi Install Components to Paletteva mi xut hin. M rng th mc dist ca BeansExample project, trong th mc ny c cha

BeansExample.jarm ta to bc trc . Chn BeansExample.jarri nhp Next.


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Quan st ta thy cc bean cha trong tp tin BeansExample.jarc lit k y.

Chn SimpleBeanJLabel v SimpleBeanJLabel2 bean ri nhp Next.


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Chn Beans (hay bt c category no m ta mun a bean vo). Nhp Finish.


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Ta thy xut hin hp thoi Palette Managernh sau. M rng mc Beans ta thy SimpleBeanJLabel v SimpleBeanJLabel2

beans xut hin y. Nhp Close.


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THAY I THUC TNH CA BEAN

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a SimpleBeanJLabel vo design window. Quan st thy SimpleBeansJLabel bean trong Beans category ca Palette. Ko th SimpleBeanJLabel vo design window. Quan st thy nhn Hello world!ang c mu nn l mu (background)

SimpleBeanJLabel


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THAY I THUC TNH CA BEAN(tt)

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Thao tc trn cc thuc tnh ca SimpleBeansJLabel bean: Nhp vo button 3 du chm (...) ca thuc background property chn mu

m ta mun i.


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Hp thoi chn mu nn (background) xut hin. Chn bt c mu no m ta mun. Nhp OK.



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Thay i text property ca bean thnh chui Sang Shin. Quan st design window ta thy mu nn v chui ch ca nhn thay i.



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Properties of the SimpleBeansJLabel bean are changed



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SimpleBeanJLabel2

Ta tip tc thay i thuc tnh cho SimpleBeanJLabel2 Ko th SimpleBeanJLabel2 bean vo design window. Quan st nhn Hello world! c mu nn l mu . Thay i labelType property ca bean t simple n null hoc bt c mu g

m ta mun


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BI 12

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