• 企业400电话
  • 微网小程序
  • AI电话机器人
  • 电商代运营
  • 全 部 栏 目

    企业400电话 网络优化推广 AI电话机器人 呼叫中心 网站建设 商标✡知产 微网小程序 电商运营 彩铃•短信 增值拓展业务
    JBuilder2005开发Web应用程序
    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
    上一篇:Java代码构建一个线程池
    下一篇:Java数据库编程中的技巧
  • 相关文章
  • 

    © 2016-2020 巨人网络通讯 版权所有

    《增值电信业务经营许可证》 苏ICP备15040257号-8

    JBuilder2005开发Web应用程序 JBuilder2005,开发,Web,应用程序,