自定义fulme---sink至mysql

实现功能：采集 nc hadoop01 44444 的数据，将nc的数据保存至mysql数据库（主要实现自定义sink至mysql,hadoop01为机器名）

若nc 没安装，请先安装netcat

1.代码如下：

package com.bigdata.flume;

import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.common.collect.Lists;
import org.apache.flume.*;
import org.apache.flume.conf.Configurable;
import org.apache.flume.sink.AbstractSink;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;

public class MysqlSink extends AbstractSink implements Configurable {

    private Logger LOG = LoggerFactory.getLogger(MysqlSink.class);
    private String hostname;
    private String port;
    private String databaseName;
    private String tableName;
    private String user;
    private String password;
    private PreparedStatement preparedStatement;
    private Connection conn;
    private int batchSize;

    public MysqlSink() {
        LOG.info("MysqlSink start...");
    }


    public void configure(Context context) {
        hostname = context.getString("hostname");
        Preconditions.checkNotNull(hostname, "hostname must be set!!");
        port = context.getString("port");
        Preconditions.checkNotNull(port, "port must be set!!");
        databaseName = context.getString("databaseName");
        Preconditions.checkNotNull(databaseName, "databaseName must be set!!");
        tableName = context.getString("tableName");
        Preconditions.checkNotNull(tableName, "tableName must be set!!");
        user = context.getString("user");
        Preconditions.checkNotNull(user, "user must be set!!");
        password = context.getString("password");
        Preconditions.checkNotNull(password, "password must be set!!");
        batchSize = context.getInteger("batchSize", 100);
        Preconditions.checkNotNull(batchSize > 0, "batchSize must be a positive number!!");
    }

    @Override
    public void start() {
        super.start();
        try {
            //调用Class.forName()方法加载驱动程序
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

        String url = "jdbc:mysql://" + hostname + ":" + port + "/" + databaseName;
        //调用DriverManager对象的getConnection()方法，获得一个Connection对象

        try {
            conn = DriverManager.getConnection(url, user, password);
            conn.setAutoCommit(false);
            //创建一个Statement对象
            preparedStatement = conn.prepareStatement("insert into " + tableName + " (content) values (?)");

        } catch (SQLException e) {
            e.printStackTrace();
            System.exit(1);
        }

    }

    @Override
    public void stop() {
        super.stop();
        if (preparedStatement != null) {
            try {
                preparedStatement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public Status process() throws EventDeliveryException {
        Status result = Status.READY;
        Channel channel = getChannel();
        Transaction transaction = channel.getTransaction();
        Event event;
        String content;

        List actions = Lists.newArrayList();
        transaction.begin();
        try {
            for (int i = 0; i < batchSize; i++) {
                event = channel.take();
                if (event != null) {
                    content = new String(event.getBody());
                    actions.add(content);
                } else {
                    result = Status.BACKOFF;
                    break;
                }
            }

            if (actions.size() > 0) {
                preparedStatement.clearBatch();
                for (String temp : actions) {
                    preparedStatement.setString(1, temp);
                    preparedStatement.addBatch();
                }
                preparedStatement.executeBatch();

                conn.commit();
            }
            transaction.commit();
        } catch (Throwable e) {
            try {
                transaction.rollback();
            } catch (Exception e2) {
                LOG.error("Exception in rollback. Rollback might not have been" +
                        "successful.", e2);
            }
            LOG.error("Failed to commit transaction." +
                    "Transaction rolled back.", e);
            Throwables.propagate(e);
        } finally {
            transaction.close();
        }

        return result;
    }
}

2.打jar包放至FLUME_HOME/lib下

3.在FLUME_HOME/conf下  

vim mysql-test.conf

a1.sources = r1
a1.sinks = k1
a1.channels = c1

a1.sources.r1.type = netcat
a1.sources.r1.bind = hadoop01
a1.sources.r1.port = 44444

a1.channels.c1.type = memory
a1.channels.c1.capacity = 1000
a1.channels.c1.transactionCapacity = 100

a1.sinks.k1.type =com.uplooking.bigdata.flume.MysqlSink
a1.sinks.k1.hostname=192.168.43.1 （注意自己本地地址，我这里的mysql为本地的，不是在虚拟机上的）
a1.sinks.k1.port=3306
a1.sinks.k1.databaseName=flume
a1.sinks.k1.tableName=mysqltest
a1.sinks.k1.user=root
a1.sinks.k1.password=000000

a1.sources.r1.channels = c1
a1.sinks.k1.channel = c1

 4.创建本地数据库

create database Flume；
create table mysqltest(id int(11) NOT NULL AUTO_INCREMENT,content varchar(255
) NOT NULL,PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

5.在hadoop01机器上执行

flume]# bin/flume-ng agent --conf conf --name a1 --conf-file conf/mysql-test.conf -Dflume.root.logger=INFO,console

再开一个界面 nc hadoop01 44444   （后启动）

输入的文本信息将保存至mysql数据库

参考：https://www.iteblog.com/archives/1109.html，丰富mysql-test.conf，是一个完整的流程