在java工程中创建项目，内容如下：

import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.interceptor.Interceptor;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class InterceptorDemo implements Interceptor {

    private List<Event> addHeaderEvents;

    @Override
    public void initialize() {
        addHeaderEvents = new ArrayList<>();
    }

    @Override
    public Event intercept(Event event) {
        byte[] body = event.getBody();
        Map<String, String> headers = event.getHeaders();
        String bodyStr = new String(body);
        if (bodyStr.contains("kb07")) {
            headers.put("type", "kb07");
        } else {
            headers.put("type", "kb09");
        }
        return event;
    }

    @Override
    public List<Event> intercept(List<Event> events) {
        addHeaderEvents.clear();
        for (Event event: events)
            addHeaderEvents.add(intercept(event));
        return addHeaderEvents;
    }

    @Override
    public void close() {

    }

    public static class Builder implements Interceptor.Builder {
        @Override
        public Interceptor build() {
            return new InterceptorDemo();
        }

        @Override
        public void configure(Context context) {

        }
    }
}

点击右侧的maven，先双击clean，再双击package打jar包

之后将jar包导入虚拟机，路径如下
/opt/flume160/lib
在虚拟机中的flume目录下执行命令：

flume-ng agent --name ictdemo2 --conf ./conf/ --conf-file ./conf/jobkb09/netcat-flume-interceptor2-hdfs.conf -Dflume.root.logger=INFO,console

在虚拟机的另一个窗口执行以下命令：telnet localhost 7777

输入
aaaaaaakb09bbbbbbbbbbbbbbbbbbb
bbbbbbbbbkb07cccccccccccccccc
ccccccccckb09cddddddddddddddddd
aaaaaaakb09ddddddddddddddd
bbbbbbbbbkb07rrrrrrrrrrrrrrrrrrr
ccccccccckb092222222222222222
aaaaaaakb0944444444444444444
bbbbbbbbbkb07666666666666666666
ccccccccckb09sssssssssssssssss
aaaaaaakb09wwwwwwwwwwwwww
bbbbbbbbbkb07sssssssssssssss
ccccccccckb09mmmmmmmmmmmmm
浏览器打开192.168.134.104:50070，生成如下文件