Heim  >  Artikel  >  Datenbank  >  JBuilder2005开发Web应用程序_MySQL

JBuilder2005开发Web应用程序_MySQL

WBOY
WBOYOriginal
2016-06-01 14:07:10954Durchsuche

JBuilder

  JBuilder是一个开放的Java IDE,它集成了Tomcat、Weblogic等服务器。虽然JDK、Tomcat、Weblogic不断升级,我们仍可以在JBuilder中使用它们的最新版本。由于Tomcat服务器的配置比较复杂,习惯了Windows平台的程序员常常对Tomcat的使用感到困惑。本文给出了一个使用Tomcat环境下的数据库连接池Database Connection Pool (DBCP) 的例子,说明了用JBuilder开发Web应用的一般步骤,并回答了一些经常遇到的问题。

  JBuilder2005所带JDK的版本是1.4.2_04-b05,其文件放在目录JBuilder_HOMEjdk1.4下,Tomcat的最新版本是5.0.27,其文件放在目录JBuilder_HOME hirdparty jakarta-tomcat-5.0.27下。下面首先给出给出了一个使用Tomcat环境下的数据库连接池Database Connection Pool (DBCP) 的例子。

  1. File-New Project新建工程文件,输入工程文件名称myWeb和目录C:myWeb

  2. Project-Project Properties设置工程文件的属性,选择Tomcat为服务器

  3. File-New新建Web Module(WAR)

  输入Web Module的名称DBTest和目录DBTest

  4. File-New新建JSP,输入jsp文件的名称test.jsp,产生test.jsp文件后修改test.jsp的内容

  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>

  将会生成一个名称为test的runtime configuration。

  选Run-Configurations-Edit可修改runtime configuration,特别是可以指定服务器的端口号和是否自动搜索为被占用的端口。

  5. File-New Class,输入类名DBTest和包名foo,产生DBTest.java文件后修改它的内容

  DBTest.java

  package 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的内容

  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运行应用,myWeb目录中将会生成Tomcat子目录,其中包含了conf子目录,

  在Tomcat_HOMEconfCatalinalocalhost目录中生成了DBTest.xml文件

  8. 将myWebTomcatconf目录中的文件server8080.xml加入工程文件,修改server8080.xml的内容

  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:myWebTomcatwebapps" autoDeploy="false" debug="0" deployXML="false" name="localhost" unpackWARs="false">

  <Context path="/DBTest" docBase="C:myWebDBTest" debug="5" reloadable="true" crossContext="true" workDir="C:myWebTomcatworkDBTest">

  <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_connections large 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 dB connections 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 and password 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 default closes 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. 将JDBC驱动放在C:BorlandJBuilder2005 hirdpartyjakarta-tomcat-5.0.27commonlib目录中

  10. 在SQL Server中建立数据库test,数据库表文件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]
  GO

  CREATE TABLE [dbo].[testdata] (
  [id] [int] NOT NULL ,
  [foo] [varchar] (50) COLLATE Chinese_Taiwan_Stroke_CI_AS NULL ,
  [bar] [int] NOT NULL
  ) ON [PRIMARY]

  GO

  输入几条记录作为测试数据。

  11. F9
   12. 在c:myWebmulu中建立批处理文件startup.bat和shutdown.bat内容分别如下:

  startup.bat:

  C:BorlandJBuilder2005jdk1.4injavaw -classpath "C:BorlandJBuilder2005 hirdpartyjakarta-tomcat-5.0.27inootstrap.jar;C:BorlandJBuilder2005jdk1.4lib ools.jar" "-Dcatalina.home=C:/Borland/JBuilder2005/thirdparty/jakarta-tomcat-5.0.27" org.apache.catalina.startup.Bootstrap -config "C:myWebTomcatconfserver8080.xml" start

  Shutdown.bat:

  C:BorlandJBuilder2005jdk1.4injavaw -classpath "C:BorlandJBuilder2005 hirdpartyjakarta-tomcat-5.0.27inootstrap.jar;C:BorlandJBuilder2005jdk1.4lib ools.jar" "-Dcatalina.home=C:/Borland/JBuilder2005/thirdparty/jakarta-tomcat-5.0.27" org.apache.catalina.startup.Bootstrap -config "C:myWebTomcatconfserver8080.xml" stop

  13. 运行startup.bat,在浏览器输入http://localhost:8080/DBTest/test.jsp

  如何部署Web应用?

  1. 打包生成war文件

  2. 将DBTest.war拷贝到Tomcat_HOMEwebapps

  3. 在Tomcat_HOMEconfCatalinalocalhost目录中建立文件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_connections large 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 dB connections 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 and password 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 default closes idle connections after 8 hours.
  -->
  <parameter>
  <name>url</name>
  <value>jdbc:microsoft:sqlserver://nt04:1433;DatabaseName=test</value>
  </parameter>
  </ResourceParams>
  </Context>


  4. 启动Tomcat,DBTest.war将会解压到Tomcat_HOMEwebappsDBTest,并且在Tomcat_HOMEworkCatalinalocalhost目录中生成DBTest目录

  为什么不能生成war文件?

  在proterties for Web Module对话框中设置与Build有关的属性Build Web archive。

  如何在Web应用中加入目录和文件?

  右击Module directory,在弹出的菜单中选择New-directory,输入目录名称;或右击拟在其中建立文件的目录,在弹出的菜单中选择New-File,选择文件类型,输入文件名。注意这样加入的文件只能是指定的文件类型。这样加入的目录和文件都会打包到war文件中。

  如何加入其它类型的文件?

  可以将文件拷贝到指定的目录,在proterties for Web Module对话框中设置属性Content,选择include all classes and resources,这样也可以将加入的文件打包到war文件中。

  如何使用指定的JDK?

  选择菜单Tools-Configure-JDKs,在弹出的对话框中按New按钮,然后选择JDK的路径。

  选择菜单Project-Project Properties,在弹出的对话框中选择加入的JDK。

  如何使用指定的Tomcat?

  选择菜单Enterprise-Configure Servers,在弹出的对话框中选择Tomcat5.0后按Copy按钮,

  选择Copy产生的服务器Copy of Tomcat 5.0,选择Home Directory

  选择菜单Project-Project Properties,在弹出的对话框中设置属性server,选择加入的Tomcat服务器



Stellungnahme:
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn