我刚刚开始学习 Apache Camel。我了解了路由和组件的基础知识。现在我想尝试连接到 Oracle 数据库,从一个特定的表中读取记录,然后使用File
组件将这些记录写入文件。要从数据库中读取,我假设我需要使用JDBC
组件并提供dataSourceName
.
但是,我找不到有关如何使用骆驼创建数据源的任何信息。我找到的与该主题相关的所有信息都使用 Spring DSL 示例。我不使用 Spring,我只需要使用简单的独立 Java 应用程序来测试它。
我将 JDK7u25 与 Apache Camel 2.12.1 一起使用。
有人可以发布一个示例以从 oracle 表中读取并写入文件吗?
[编辑]
在网上查看了几个解决方案后,我了解了以下两种方法:
Camel 作为独立运行。这是我的代码:
import javax.sql.DataSource; import org.apache.camel.main.Main; import org.apache.camel.builder.RouteBuilder; import org.apache.commons.dbcp.BasicDataSource; public class JDBCExample { private Main main; public static void main(String[] args) throws Exception { JDBCExample example = new JDBCExample(); example.boot(); } public void boot() throws Exception { // create a Main instance main = new Main(); // enable hangup support so you can press ctrl + c to terminate the JVM main.enableHangupSupport(); String url = "jdbc:oracle:thin:@MYSERVER:1521:myDB"; DataSource dataSource = setupDataSource(url); // bind dataSource into the registery main.bind("myDataSource", dataSource); // add routes main.addRouteBuilder(new MyRouteBuilder()); // run until you terminate the JVM System.out.println("Starting Camel. Use ctrl + c to terminate the JVM.\n"); main.run(); } class MyRouteBuilder extends RouteBuilder { public void configure() { String dst = "C:/Local Disk E/TestData/Destination"; from("direct:myTable") .setBody(constant("select * from myTable")) .to("jdbc:myDataSource") .to("file:" + dst); } } private DataSource setupDataSource(String connectURI) { BasicDataSource ds = new BasicDataSource(); ds.setDriverClassName("oracle.jdbc.driver.OracleDriver"); ds.setUsername("sa"); ds.setPassword("devon1"); ds.setUrl(connectURI); return ds; } }
使用 Claus lbsen 提到的方法。这是代码:
import javax.sql.DataSource; import org.apache.camel.CamelContext; import org.apache.camel.impl.DefaultCamelContext; import org.apache.camel.impl.SimpleRegistry; import org.apache.camel.main.Main; import org.apache.camel.builder.RouteBuilder; import org.apache.commons.dbcp.BasicDataSource; public class JDBCExample { private Main main; public static void main(String[] args) throws Exception { String url = "jdbc:oracle:thin:@MYSERVER:1521:myDB"; DataSource dataSource = setupDataSource(url); SimpleRegistry reg = new SimpleRegistry() ; reg.put("myDataSource",dataSource); CamelContext context = new DefaultCamelContext(reg); context.addRoutes(new JDBCExample().new MyRouteBuilder()); context.start(); Thread.sleep(5000); context.stop(); } class MyRouteBuilder extends RouteBuilder { public void configure() { String dst = "C:/Local Disk E/TestData/Destination"; from("direct:myTable") .setBody(constant("select * from myTable")) .to("jdbc:myDataSource") .to("file:" + dst); } } private static DataSource setupDataSource(String connectURI) { BasicDataSource ds = new BasicDataSource(); ds.setDriverClassName("oracle.jdbc.driver.OracleDriver"); ds.setUsername("sa"); ds.setPassword("devon1"); ds.setUrl(connectURI); return ds; } }
但在这两种情况下,我都遇到了异常:
Caused by: org.apache.camel.ResolveEndpointFailedException: Failed to resolve endpoint: jdbc://myDataSource due to: No component found with scheme: jdbc
at org.apache.camel.impl.DefaultCamelContext.getEndpoint(DefaultCamelContext.java:534)
at org.apache.camel.util.CamelContextHelper.getMandatoryEndpoint(CamelContextHelper.java:63)
at org.apache.camel.model.RouteDefinition.resolveEndpoint(RouteDefinition.java:192)
at org.apache.camel.impl.DefaultRouteContext.resolveEndpoint(DefaultRouteContext.java:106)
at org.apache.camel.impl.DefaultRouteContext.resolveEndpoint(DefaultRouteContext.java:112)
at org.apache.camel.model.SendDefinition.resolveEndpoint(SendDefinition.java:61)
at org.apache.camel.model.SendDefinition.createProcessor(SendDefinition.java:55)
at org.apache.camel.model.ProcessorDefinition.makeProcessor(ProcessorDefinition.java:500)
at org.apache.camel.model.ProcessorDefinition.addRoutes(ProcessorDefinition.java:213)
at org.apache.camel.model.RouteDefinition.addRoutes(RouteDefinition.java:909)
... 12 more
[Thread-0] INFO org.apache.camel.main.MainSupport$HangupInterceptor - Received hang up - stopping the main instance.