如何修改camel Exchange并发送它

<dependencies>
    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-core</artifactId>
        <version>3.11.0</version> <!-- 使用最新的版本 -->
    </dependency>
</dependencies>

import org.apache.camel.builder.RouteBuilder;

public class MyRouteBuilder extends RouteBuilder {
    @Override
    public void configure() throws Exception {
        from("direct:start")
            .process(exchange -> {
                // 获取消息体
                String body = exchange.getIn().getBody(String.class);
                // 修改消息体
                String modifiedBody = "Modified: " + body;
                // 设置修改后的消息体回到 Exchange
                exchange.getIn().setBody(modifiedBody);
            })
            .to("log:modified?showAll=true"); // 将修改后的消息记录到日志
    }
}

import org.apache.camel.impl.DefaultCamelContext;

public class MainApp {
    public static void main(String[] args) throws Exception {
        CamelContext context = new DefaultCamelContext();
        context.addRoutes(new MyRouteBuilder());
        context.start();
        Thread.sleep(10000); // 让路由运行一段时间
        context.stop();
    }
}

import org.apache.camel.ProducerTemplate;

public class MainApp {
    public static void main(String[] args) throws Exception {
        CamelContext context = new DefaultCamelContext();
        context.addRoutes(new MyRouteBuilder());
        context.start();

        ProducerTemplate template = context.createProducerTemplate();
        template.sendBody("direct:start", "Hello Camel");

        Thread.sleep(10000); // 让路由运行一段时间
        context.stop();
    }
}