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開(kāi)發(fā)J2EE Web應(yīng)用的準(zhǔn)備工作：
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先安裝JSDK，再安裝JBoss.
安裝JSDK,必須獲得一套對(duì)應(yīng)于用戶的操作系統(tǒng)的JDK，
我的安裝的文件目錄是
Windows2000: d:\s1studio_jdk\j2sdk1.4.1
Linux： /root/s1studio_jdk/j2sdk1.4.1
為了用EJB, 需要一個(gè)j2ee-1.3.jar或者j2ee-1.2.jar,
如果安裝了Sun One Studio 或者 J2EE （www.sun.com ）這個(gè)文件已經(jīng)有.
把這個(gè)文件放在classpath路徑上.
或者使用jboss-j2ee.jar, 安裝JBoss后在$JBoss\client中可找到.
建議安裝Sun One Studio, 用Sun One Studio編譯Java源程序,
不用設(shè)置classpath, 省去不少過(guò)程.
安裝JBoss:
把JBoss的壓縮包解開(kāi)，放在任一目錄上,
我的安裝的文件目錄是
/dose/jboss-3.0.4_tomcat-4.1.12 (REDHAT8.0)
E:\jboss-3.0.4_tomcat-4.1.12 (WINDOWS2000)
WINDOWS2000, linux共用同一套JBoss.
配置JBoss：
啟動(dòng)JBoss需要執(zhí)行一個(gè)腳本文件：
linux：run.sh
WINDOWS對(duì)應(yīng)的是：run.bat
(1)
在JBoss\bin\run.bat (for Windows)開(kāi)頭插入一行
set JAVA_HOME = d:\s1studio_jdk\j2sdk1.4.1
在JBoss\bin\run.sh (for Linux)開(kāi)頭插入一行
JAVA_HOME="/root/s1studio_jdk/j2sdk1.4.1"
或者
(2)設(shè)置系統(tǒng)環(huán)境變量JAVA_HOME,指向JDK
運(yùn)行JBoss, run.sh或者run.bat
當(dāng)看到啟動(dòng)JBoss的信息時(shí)，說(shuō)明啟動(dòng)了.
服務(wù)器簡(jiǎn)單的測(cè)試：
JBoss默認(rèn)的WEB端口為8080，我們可以在打開(kāi)一個(gè)瀏覽器輸入地址
http://localhost:8080/jmx-console
當(dāng)在瀏覽器看到JBoss的信息時(shí)，說(shuō)明安裝配置JBoss成功了.
建立下面的目錄和文件(注意大小寫(xiě)).
FIRST.EAR
|
|-----META-INF (application.XML)
|
|-----First.jar
| |-----META-INF (ejb-jar.xml,jboss.xml)
| `-----Dev
| |-----First(FirstSession.java, FirstSessionHome.java, FirstSessionBean.java)
| |-----Delegate(NewDelegate.java)
| `-----Dao(MySQLDao.java)
|
`-----First.war(index.JSP)
|
`-----WEB-INF (jboss-web.xml, web.xml)
|-----classes
`-----lib
編譯JAVA源程序,生成class文件.
進(jìn)入JAVA源程序目錄, 運(yùn)行:
javac -classpath %classpath%;%jboss%\server\default\deploy\First.ear\First.jar *.java
或者
javac -classpath %jboss%\server\default\deploy\First.ear\First.jar;%jboss%\client\jboss-j2ee.jar *.java
Copy 目錄First.ear to jboss\server\default\deploy.
打開(kāi)瀏覽器輸入地址 http://localhost:8080/First
到此, 在瀏覽器看到: Hello! This My Session Bean From Jboss.
說(shuō)明這個(gè)EJB工作了.
如果按按鈕, 沒(méi)反應(yīng)或出錯(cuò). 原因沒(méi)安裝配置數(shù)據(jù)庫(kù), 下面安裝配置Postgres數(shù)據(jù)庫(kù)
For Windows2000
下載 PgSQL731wina1.exe (http://www.postgresql.org ),
Finally you will see the next line, you need enter the password for Administrator
最后你將看下一個(gè)行,你必須為用戶Administrator輸入password.
********************
Enter password of user `.\Administrator′:123456
********************
記下此password, 我的口令是123456.
從開(kāi)始菜單 > Programm > PostgresSQL > Adjust PostgresSQL Configuration file
它將在Wordpad中打開(kāi)PostgresSQL Configuration文件, 找到下列行,
#
# Connection Parameters
#
#tcpip_Socket = false
#ssl = false
#max_connections = 32
#superuser_reserved_connections = 2
#port = 5432
修改編輯:
#
# Connection Parameters
#
tcpip_socket = true
#ssl = false
#max_connections = 32
#superuser_reserved_connections = 2
port = 5432
接著，保存文件.
起動(dòng)PostgresSQL服務(wù)器:
開(kāi)始菜單>Programm>PostgresSQL>Utilies>Start PostgresSQL Server
起動(dòng)命令行:
開(kāi)始菜單>Programm>PostgresSQL>Utilies>Command Shell
執(zhí)行下列命令,準(zhǔn)備數(shù)據(jù),
Administrator@SAN /
$ dir
$ cd bin
$ createdb test
$ psql test
test=# create table users
test-# (name varchar(20),
test(# id varchar(20),
test(# country varchar(20));
test=# insert into users values (′Sam′, ′123′, ′China′);
test=# insert into users values (′Tom′, ′321′, ′USA′);
test=# insert into users values (′Sean′, ′231′, ′France′);
test=# select * from users;
name | id | country
------+-----+---------
Sam | 123 | China
Tom | 321 | USA
Sean | 231 | France
(3 rows)
test=#
到此, 數(shù)據(jù)準(zhǔn)備就緒.
For RedHat:
以root登陸, 執(zhí)行下列命令,準(zhǔn)備數(shù)據(jù),
mkdir /usr/local/pgsql/data
chown postgres /usr/local/pgsql/data
su - postgres
/usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data
Open and edit /usr/local/pgsql/data/pg_hba.conf
local all trust
host all 127.0.0.1 255.255.255.255 trust
just delete #, and save.
[root@localhost root]# su - postgres
-bash-2.05b$ /usr/bin/postmaster -i -D /usr/local/pgsql/data >logfile 2>&1 &
-bash-2.05b$ /usr/bin/createdb test
-bash-2.05b$ /usr/local/pgsql/bin/psql test
test=# .......the following same as Windows2000
到此, 數(shù)據(jù)準(zhǔn)備就緒.
執(zhí)行shutdown.bat or shutdown.sh, 停止Jboss Server.
找到JDBC drive.
為了在Jboss中使用連接池,需要拷貝jdbc drive 到Jboss/server/default/deploy , 在linux 我們能找到/usr/share/pgsql/pgjdbc2.jar,在wondows2000,我們能找到PostgreSQL\usr\share\postgresql\java\postgresql.jar
把其中之一復(fù)制到Jboss/server/default/deploy
配置Jboss
(1) 復(fù)制 $Jboss/examples/jca/postgres-service.xml 到 $Jboss/server/default/deploy/
(2) 打開(kāi)編輯Jboss/server/default/deploy/postgres-service.xml
PostgresDS
jdbc:postgresql://localhost/test
org.postgresql.Driver
Administrator
123456
在我的例子中，
windows2000, 用戶:Administrator，password:123456
Linux(RH8.0), 用戶:Postgres, 沒(méi)有password
因?yàn)镻ostgresSQL和windows2000使用不同的default用戶名,所以在linux和window2000中這文件不同.當(dāng)然，你可以加相同的PostgresSQL用戶名和password在linux和window2000中, 這樣這文件就相同了.
保存文件.
(3) 打開(kāi)編輯 $Jboss/server/default/conf/standardjbosscmp-jdbc.xml
找到:
java:/DefaultDS
Hypersonic SQL
加入:
java:/PostgresDS
Postgres
保存文件.
(4) open and edit $Jboss/server/default/conf/standardjaws.xml
找到:
java:/DefaultDS
Hypersonic SQL
false
加入:
java:/PostgresDS
Postgres
false
保存文件.
現(xiàn)在重啟JBoss.
打開(kāi)瀏覽器輸入地址http://localhost:8080/First br> 輸入ID,按按鈕
#p#
附件：源文件代碼
MysqlDao.java
- package Dev.Dao;
- import java.sql.Connection;
- import java.sql.SQLException;
- import java.sql.Statement;
- import java.sql.ResultSet;
- import javax.naming.InitialContext;
- import javax.sql.DataSource;
- public class MysqlDao {
- public Connection getConnection() throws Exception {
- InitialContext ctx = new InitialContext();
- DataSource ds = (DataSource) ctx.lookup("java:/PostgresDS");
- Connection conn = null;
- Statement stmt = null;
- try {
- conn = ds.getConnection();
- } catch (SQLException sqlEx) {
- System.out.println("Error connect to pool.");
- }
- return conn;
- }
- public String getName(String id) throws Exception {
- Connection conn = null;
- Statement stmt = null;
- ResultSet rs = null;
- String name = "";
- try {
- conn = getConnection();
- if ( conn !=null )System.out.println("Get conecttion. "+ conn.toString());
- stmt = conn.createStatement();
- if ( stmt !=null )System.out.println("Get Statement. "+ stmt.toString());
- String sql = "SELECT * from users where id = '"+id+"'";
- System.out.println("Sql from getId(): "+sql);
- rs = stmt.executeQuery(sql);
- if ( rs !=null )System.out.println("Get result. ");
- if (rs.next()){
- name = rs.getString("name");
- }
- } catch (Exception sqlEx) {
- System.out.println("Error from getName().");
- System.out.println("Error from DAO.getName() :" + sqlEx.getMessage());
- }finally {
- if (conn != null) {
- try { conn.close(); } catch (Exception sqlEx) { }
- }
- }
- return name;
- }
- public String getCountry(String id) throws Exception {
- Connection conn = null;
- Statement stmt = null;
- String name = "";
- try {
- conn = getConnection();
- stmt = conn.createStatement();
- String sql = "SELECT * from users where id = '"+id+"'";
- System.out.println("Sql from getCountry(): "+sql);
- java.sql.ResultSet rs = stmt.executeQuery(sql);
- if (rs.next())
- {
- name = rs.getString("Country");
- }
- } catch (SQLException sqlEx) {
- System.out.println("Error from getCountry().");
- }finally {
- if (conn != null) {
- try { conn.close(); } catch (Exception sqlEx) { }
- }
- }
- return name;
- }
- }
- /*
- **
- **NewDelegate.java
- **
- */
- package Dev.Delegate;
- import java.lang.*;
- import Dev.First.*;
- public class NewDelegate {
- Dev.First.FirstSession bean = null;
- public NewDelegate( ){
- try {
- javax.naming.InitialContext ctx = new javax.naming.InitialContext();
- Object objref = ctx.lookup("ejb/FirstSession");
- Dev.First.FirstSessionHome testBean = (Dev.First.FirstSessionHome)
- javax.rmi.PortableRemoteObject.narrow
- (objref,Dev.First.FirstSessionHome.class);
- bean = testBean.create();
- System.out.println("From JSP");
- } catch (Exception NamingException) {
- NamingException.printStackTrace();
- }
- }
- public String Welcome() {
- String msg = "";
- try {
- msg = bean.Welcome();
- } catch (Exception NamingException) {
- NamingException.printStackTrace();
- }
- return msg;
- }
- public String getName(String id) {
- String name = "";
- try {
- name = bean.getName(id);
- } catch (Exception NamingException) { NamingException.printStackTrace();}
- return name;
- }
- public String getCountry(String id) {
- String country = "";
- try {
- country = bean.getCountry(id);
- } catch (Exception NamingException) { NamingException.printStackTrace();}
- return country;
- }
- }
- /*
- **
- **FirstSession.java
- **
- */
- package Dev.First;
- import java.lang.*;
- import java.rmi.RemoteException;
- import javax.ejb.CreateException;
- import javax.ejb.EJBException;
- import javax.ejb.SessionBean;
- import javax.ejb.SessionContext;
- public interface FirstSession extends javax.ejb.EJBObject{
- public String Welcome() throws java.rmi.RemoteException;
- public String getName(String id) throws java.rmi.RemoteException;
- public String getCountry(String id) throws java.rmi.RemoteException;
- }
- /*
- **
- **FirstSessionHome.java
- **
- */
- package Dev.First;
- import java.lang.*;
- import java.rmi.RemoteException;
- import javax.ejb.CreateException;
- import javax.ejb.EJBException;
- import javax.ejb.SessionBean;
- import javax.ejb.SessionContext;
- public interface FirstSessionHome extends javax.ejb.EJBHome{
- public FirstSession create() throws javax.ejb.CreateException, java.rmi.RemoteException;
- }
- /*
- **
- **FirstSessionBean.java
- **
- */
- package Dev.First;
- import java.rmi.RemoteException;
- import javax.ejb.CreateException;
- import javax.ejb.EJBException;
- import javax.ejb.SessionBean;
- import javax.ejb.SessionContext;
- public class FirstSessionBean implements SessionBean{
- public void ejbCreate() throws CreateException {
- }
- public String Welcome(){
- String msg="Hello! This My Session Bean From Jboss.";
- System.out.println(msg);
- return msg;
- }
- public String getName(String id){
- String name = "";
- System.out.println("From bean before getName :"+ name);
- try{
- Dev.Dao.MysqlDao dao = new Dev.Dao.MysqlDao();
- name = dao.getName(id);
- System.out.println("From bean after getName :"+ name);
- }catch(Exception e){ System.out.println(e.getMessage());}
- return name;
- }
- public String getCountry(String id){
- String country = "";
- try{
- Dev.Dao.MysqlDao dao = new Dev.Dao.MysqlDao();
- country = dao.getCountry(id);
- }catch(Exception e){ }
- return country;
- }
- public void setSessionContext( SessionContext aContext ) throws EJBException {
- }
- public void ejbActivate() throws EJBException {
- }
- public void ejbPassivate() throws EJBException {
- }
- public void ejbRemove() throws EJBException {
- }
- }
- /*不要將下面這行放入index.jsp
- **
- **index.jsp
- **
- */不要將上面這行放入index.jsp
- < %@page language="java" %>
- < %
- String msg = "";
- String msg1 = "";
- Dev.Delegate.NewDelegate nn = new Dev.Delegate.NewDelegate();
- if (request.getParameter("id") != null &&
- request.getParameter("id") != ""&&
- !request.getParameter("id").equals("")){
- String id = request.getParameter("id");
- String name = "";
- Dev.Dao.MysqlDao dao = new Dev.Dao.MysqlDao();
- name = nn.getName(id); //access database through session bean
- //name = dao.getName(id); //access database directly
- if(name!= null && !name.equals("")){
- msg1 ="Welcome " + name +" ! You are from "+ dao.getCountry(id)+ " .";
- }else{
- msg1 ="Please Check Your ID. : " + id;
- }
- }
- msg = nn.Welcome() ;
- %>
- < html>
- < head>
- < title>Welcome< /title>
- < /head>
- < body bgcolor="#FFFFCC">
- < br> < %= msg %> < br>
- < FORM ACTION="index.jsp" method="post">
- < P>Your ID:
- < INPUT TYPE="TEXT" NAME="id" size = "10">< /P>
- < P>< INPUT TYPE="SUBMIT" NAME="SUBMIT">< /P>
- < /FORM>
- < br>
- < br>
- < %=(msg1 == "")? "":msg1 + "< br> < br> < br>Connect to Database OK." %>
- < /body>
- < /html>
- < !--不要將此以下5行存入文件
- **
- **ejb-jar.xml
- **
- -->不要將此以上5行存入文件, 下同.
- < ?xml version="1.0" encoding="UTF-8"?>
- < !DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN"
- "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
- < ejb-jar>
- < description>First< /description>
- < display-name>First< /display-name>
- < enterprise-beans>
- < !-- Session Beans -->
- < session id="MyFirstSession">
- < display-name>My First Session Bean< /display-name>
- < ejb-name>FirstSession< /ejb-name>
- < home>Dev.First.FirstSessionHome< /home>
- < remote>Dev.First.FirstSession< /remote>
- < ejb-class>Dev.First.FirstSessionBean< /ejb-class>
- < session-type>Stateless< /session-type>
- < transaction-type>Container< /transaction-type>
- < /session>
- < /enterprise-beans>
- < assembly-descriptor>
- < /assembly-descriptor>
- < /ejb-jar>
jboss.xml
- < ?xml version="1.0" encoding="UTF-8"?>
- < !DOCTYPE jboss PUBLIC "-//JBoss//DTD JBOSS//EN" "http://www.jboss.org/j2ee/dtd/jboss.dtd">
- < jboss>
- < enterprise-beans>
- < session>
- < ejb-name>FirstSession< /ejb-name>
- < jndi-name>ejbFirstSession< /jndi-name>
- < /session>
- < /enterprise-beans>
- < resource-managers>
- < /resource-managers>
- < /jboss>
jboss-web.xml
- < ?xml version="1.0" encoding="UTF-8"?>
- < !DOCTYPE jboss-web PUBLIC "-//JBoss//DTD Web Application 2.2//EN"
- "http://www.jboss.org/j2ee/dtd/jboss-web.dtd">
- < jboss-web>
- < resource-ref>
- < res-ref-name>jdbcPostgresDS< /res-ref-name>
- < res-type>javax.sql.DataSource< /res-type>
- < jndi-name>java:/PostgresDS< /jndi-name>
- < /resource-ref>
- < /jboss-web>
web.xml
- < ?xml version="1.0" encoding="ISO-8859-1"?>
- < !DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
- "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
- < web-app>
- < resource-ref>
- < description>Postgresql driver< /description>
- < res-ref-name>jdbcPostgresDS< /res-ref-name>
- < res-type>javax.sql.DataSource< /res-type>
- < res-auth>Container< /res-auth>
- < /resource-ref>
- < /web-app>
application.xml
- < ?xml version="1.0" encoding="ISO-8859-1"?>
- < application>
- < display-name>First< /display-name>
- < module>
- < web>
- < web-uri>First.war< /web-uri> 新聞名稱：快速開(kāi)發(fā)EJB和J2EEWeb應(yīng)用
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