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如何利用JBuilder2005開發Web應用程序

2024-07-21 02:14:58
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jbuilder是一個開放的java ide,它集成了tomcat、weblogic等服務器。雖然jdk、tomcat、weblogic不斷升級,我們仍可以在jbuilder中使用它們的最新版本。由于tomcat服務器的配置比較復雜,習慣了windows平臺的程序員常常對tomcat的使用感到困惑。

本文給出了一個使用tomcat環境下的數據庫連接池database connection pool (dbcp) 的例子,說明了用jbuilder開發web應用的一般步驟,并回答了一些經常遇到的問題。

jbuilder2005所帶jdk的版本是1.4.2_04-b05,其文件放在目錄jbuilder_home/jdk1.4下,tomcat的最新版本是5.0.27,其文件放在目錄jbuilder_home/thirdparty/ jakarta-tomcat-5.0.27下。下面首先給出給出了一個使用tomcat環境下的數據庫連接池database connection pool (dbcp) 的例子。

1. file-new project新建工程文件,輸入工程文件名稱myweb和目錄c:/myweb

2. project-project properties設置工程文件的屬性,選擇tomcat為服務器

3. file-new新建web module(war)

輸入web module的名稱dbtest和目錄dbtest

4. file-new新建jsp,輸入jsp文件的名稱test.jsp,產生test.jsp文件后修改test.jsp的內容:

test.jsp:<%@ page contenttype="text/html; charset=big5" %><html><head> <title>db test</title></head><body> <%foo.dbtest tst = new foo.dbtest();tst.init(); %> <h2>results</h2> foo <%= tst.getfoo() %><br/> bar <%= tst.getbar() %></body></html>

將會生成一個名稱為test的runtime configuration。選run-configurations-edit可修改runtime configuration,特別是可以指定服務器的端口號和是否自動搜索為被占用的端口。

5. file-new class,輸入類名dbtest和包名foo,產生dbtest.java文件后修改它的內容

dbtest.javapackage foo;import javax.naming.*;import javax.sql.*;import java.sql.*;public class dbtest{ string foo = "not connected"; int bar = -1; public void init() {  try{   context ctx = new initialcontext();   if(ctx == null )    throw new exception("boom - no context");    datasource ds =(datasource)ctx.lookup("java:comp/env/jdbc/testdb");    if (ds != null) {     connection conn = ds.getconnection();     if(conn != null) {      foo = "got connection "+conn.tostring();      statement stmt =conn.createstatement();      resultset rst =stmt.executequery("select id, foo, bar from testdata");      if(rst.next()) {       foo=rst.getstring(2);       bar=rst.getint(3);      }      conn.close();     }    }   }catch(exception e) {    e.printstacktrace();   }  } public string getfoo() { return foo; } public int getbar() { return bar;}}
6. 修改web.xml的內容

web.xml:<?xml version="1.0" encoding="utf-8"?><web-app 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" version="2.4"> <description>mysql test app</description> <resource-ref>  <description>db connection</description>  <res-ref-name>jdbc/testdb</res-ref-name>  <res-type>javax.sql.datasource</res-type>  <res-auth>container</res-auth> </resource-ref></web-app>


7. f9運行應用,myweb目錄中將會生成tomcat子目錄,其中包含了conf子目錄,在tomcat_home/conf/catalina/localhost目錄中生成了dbtest.xml文件。

8. 將myweb/tomcat/conf目錄中的文件server8080.xml加入工程文件,修改server8080.xml的內容:

  server8080.xml:<?xml version="1.0"encoding="utf-8"?><server debug="0" port="8081"shutdown="shutdown"><service name="catalina"> <connector acceptcount="10" connectiontimeout="60000" debug="0" maxthreads="75" minsparethreads="5" port="8080"/> <engine debug="0" defaulthost="localhost"name="catalina"> <host appbase="c:/myweb/tomcat/webapps" autodeploy="false" debug="0" deployxml="false" name="localhost" unpackwars="false"> <context path="/dbtest" docbase="c:/myweb/dbtest" debug="5" reloadable="true" crosscontext="true"workdir="c:/myweb/tomcat/work/dbtest"> <logger classname="org.apache.catalina.logger.filelogger" prefix="localhost_dbtest_log."suffix=".txt" timestamp="true"/> <resource name="jdbc/testdb" auth="container"type="javax.sql.datasource"/> <resourceparams name="jdbc/testdb"> <parameter>  <name>factory</name>  <value>org.apache.commons.dbcp.basicdatasourcefactory</value> </parameter> <!--  maximum number of dbconnections in pool. make sure you  configure your mysqldmax_connections large enough to handle  all of your dbconnections. set to 0 for no limit. --> <parameter>  <name>maxactive</name>  <value>100</value> </parameter> <!--  maximum number of idle dbconnections to retain in pool.  set to 0 for no limit. --> <parameter>  <name>maxidle</name>  <value>30</value> </parameter> <!--  maximum time to wait for a db connection to become available  in ms, in this example 10 seconds.an exception is thrown if  this timeout is exceeded. set to -1 to wait indefinitely. --> <parameter>  <name>maxwait</name>  <value>10000</value> </parameter> <!-- mysql db username andpassword for db connections --> <parameter>  <name>username</name>  <value>sa</value> </parameter> <parameter>  <name>password</name>  <value>topcomputer</value> </parameter> <!-- class name for mm.mysql jdbc driver --> <parameter>  <name>driverclassname</name>  <value>com.microsoft.jdbc.sqlserver.sqlserverdriver</value> </parameter> <!--  the jdbc connection url for connecting to your mysql db.  the autoreconnect=true argument to the url makes sure that the  mm.mysql jdbc driver will automatically reconnect if mysqld closed the  connection. mysqld by defaultcloses idle connections after 8 hours. --> <parameter>  <name>url</name>  <value>jdbc:microsoft:sqlserver://nt04:1433;databasename=test</value> </parameter></resourceparams></context></host></engine></service></server>
9. 將jdbc驅動放在c:/borland/jbuilder2005/thirdparty/jakarta-tomcat-5.0.27/common/lib目錄中

10. 在sql server中建立數據庫test,數據庫表文件testdata

creattable.sql:if exists (select * from dbo.sysobjects where id = object_id(n'[dbo].[testdata]') and objectproperty(id, n'isusertable') = 1)drop table [dbo].[testdata]gocreate table [dbo].[testdata] ( [id] [int] not null , [foo] [varchar] (50) collate chinese_taiwan_stroke_ci_as null , [bar] [int] not null ) on [primary]go

輸入幾條記錄作為測試數據。

11. f9

12. 在c:/mywebmulu中建立批處理文件startup.bat和shutdown.bat內容分別如下:

startup.bat:c:/borland/jbuilder2005/jdk1.4/bin/javaw -classpath"c:/borland/jbuilder2005/thirdparty/jakarta-tomcat-5.0.27/bin/bootstrap.jar;c:/borland/jbuilder2005/jdk1.4/lib/tools.jar" "-dcatalina.home=c:/borland/jbuilder2005/thirdparty/jakarta-tomcat-5.0.27" org.apache.catalina.startup.bootstrap -config "c:/myweb/tomcat/conf/server8080.xml" startshutdown.bat:c:/borland/jbuilder2005/jdk1.4/bin/javaw -classpath "c:/borland/jbuilder2005/thirdparty/jakarta-tomcat-5.0.27/bin/bootstrap.jar;c:/borland/jbuilder2005/jdk1.4/lib/tools.jar" "-dcatalina.home=c:/borland/jbuilder2005/thirdparty/jakarta-tomcat-5.0.27" org.apache.catalina.startup.bootstrap -config "c:/myweb/tomcat/conf/server8080.xml" stop

13. 運行startup.bat,在瀏覽器輸入http://localhost:8080/dbtest/test.jsp

如何部署web應用?

1. 打包生成war文件

2. 將dbtest.war拷貝到tomcat_home/webapps

3. 在tomcat_home/conf/catalina/localhost目錄中建立文件dbtest.xml

dbtest.xml<!-- context configuration file for the tomcat administration web app$id: admin.xml,v 1.2 2002/07/23 12:13:05 remm exp $--><context path="/dbtest" docbase="/dbtest" debug="5" reloadable="true" crosscontext="true" workdir="../work/dbtest"><logger classname="org.apache.catalina.logger.filelogger" prefix="localhost_dbtest_log." suffix=".txt" timestamp="true"/><resource name="jdbc/testdb"auth="container" type="javax.sql.datasource"/><resourceparams name="jdbc/testdb"> <parameter>  <name>factory</name>  <value>org.apache.commons.dbcp.basicdatasourcefactory</value> </parameter> <!--  maximum number of db connections in pool. make sure you  configure your mysqld max_connectionslarge enough to handle  all of your db connections.set to 0 for no limit. --> <parameter>  <name>maxactive</name>  <value>100</value> </parameter> <!--  maximum number of idle dbconnections to retain in pool.  set to 0 for no limit. --> <parameter>  <name>maxidle</name>  <value>30</value> </parameter> <!--  maximum time to wait for a db connection to become available  in ms, in this example 10 seconds. an exception is thrown if  this timeout is exceeded. set to -1 to wait indefinitely. --> <parameter>  <name>maxwait</name>  <value>10000</value> </parameter> <!-- mysql db username andpassword for db connections --> <parameter>  <name>username</name>  <value>sa</value> </parameter> <parameter>  <name>password</name>  <value>topcomputer</value> </parameter> <!-- class name for mm.mysql jdbc driver --> <parameter>  <name>driverclassname</name>  <value>com.microsoft.jdbc.sqlserver.sqlserverdriver</value> </parameter> <!--  the jdbc connection url for connecting to your mysql db.  the autoreconnect=true argument to the url makes sure that the  mm.mysql jdbc driver will automaticallyreconnect if mysqld closed the  connection. mysqld by default closesidle connections after 8 hours. --> <parameter>  <name>url</name>  <value>jdbc:microsoft:sqlserver://nt04:1433;databasename=test</value> </parameter></resourceparams></context>

4. 啟動tomcat,dbtest.war將會解壓到tomcat_home/webapps/dbtest,并且在tomcat_home/work/catalina/localhost目錄中生成dbtest目錄

為什么不能生成war文件?

在proterties for web module對話框中設置與build有關的屬性build web archive。

如何在web應用中加入目錄和文件?

右擊module directory,在彈出的菜單中選擇new-directory,輸入目錄名稱;或右擊擬在其中建立文件的目錄,在彈出的菜單中選擇new-file,選擇文件類型,輸入文件名。注意這樣加入的文件只能是指定的文件類型。這樣加入的目錄和文件都會打包到war文件中。

如何加入其它類型的文件?

可以將文件拷貝到指定的目錄,在proterties for web module對話框中設置屬性content,選擇include all classes and resources,這樣也可以將加入的文件打包到war文件中。

如何使用指定的jdk?

選擇菜單tools-configure-jdks,在彈出的對話框中按new按鈕,然后選擇jdk的路徑。

選擇菜單project-project properties,在彈出的對話框中選擇加入的jdk。

如何使用指定的tomcat?

選擇菜單enterprise-configure servers,在彈出的對話框中選擇tomcat5.0后按copy按鈕,

選擇copy產生的服務器copy of tomcat 5.0,選擇home directory

選擇菜單project-project properties,在彈出的對話框中設置屬性server,選擇加入的tomcat服務器

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