新版api mapreduce reduce结果写入mysql

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.db.DBConfiguration;
import org.apache.hadoop.mapreduce.lib.db.DBOutputFormat;
import org.apache.hadoop.mapreduce.lib.db.DBWritable;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;

/**
* 将mapreduce的结果数据写入mysql中
*
* @author caozw
*/
public class WriteDataToMysql {
/**
* 重写DBWritable
*
* @author asheng TblsWritable需要向mysql中写入数据
*/
public static class TblsWritable implements Writable, DBWritable {
String tbl_name;
String tbl_type;

public TblsWritable() {

}

public TblsWritable(String tbl_name, String tab_type) {
this.tbl_name = tbl_name;
this.tbl_type = tab_type;
}

@Override
public void write(PreparedStatement statement) throws SQLException {
statement.setString(1, this.tbl_name);
statement.setString(2, this.tbl_type);
}

@Override
public void readFields(ResultSet resultSet) throws SQLException {
this.tbl_name = resultSet.getString(1);
this.tbl_type = resultSet.getString(2);
}

@Override
public void write(DataOutput out) throws IOException {
out.writeUTF(this.tbl_name);
out.writeUTF(this.tbl_type);
}

@Override
public void readFields(DataInput in) throws IOException {
this.tbl_name = in.readUTF();
this.tbl_type = in.readUTF();
}

public String toString() {
return new String(this.tbl_name + " " + this.tbl_type);
}
}

public static class ConnMysqlMapper extends
Mapper<LongWritable, Text, Text, IntWritable>
// TblsRecord是自定义的类型，也就是上面重写的DBWritable类
{
enum Counter {
LINESKIP,
}

private final static IntWritable one = new IntWritable(1);

public void map(LongWritable key, Text value, Context context)
throws IOException, InterruptedException {

try {
String line = value.toString();
String[] strings = line.split("\t");
String initTime = strings[1];
String devType = strings[4];
if (initTime.length() == 19) {
SimpleDateFormat sdf = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
Date date = sdf.parse(initTime);

context.write(new Text(initTime.substring(0, 10)),one);
} else {
// System.err.println(initTime);
context.getCounter(Counter.LINESKIP).increment(1);
}
// } catch (ArrayIndexOutOfBoundsException e) {
} catch (ArrayIndexOutOfBoundsException e) {
context.getCounter(Counter.LINESKIP).increment(1);
return;
} catch (ParseException e) {
context.getCounter(Counter.LINESKIP).increment(1);
return;
}
}

}

public static class ConnMysqlReducer extends
Reducer<Text, Text, TblsWritable, TblsWritable> {
public void reduce(Text key, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
int count = 0;
for (Iterator<Text> itr = values.iterator(); itr.hasNext(); itr
.next()) {
count++;
}
context.write(
new TblsWritable(key.toString(), String.valueOf(count)),
null);
}
}

public static void main(String args[]) throws IOException,
InterruptedException, ClassNotFoundException {
Configuration conf = new Configuration();

DBConfiguration.configureDB(conf, "com.mysql.jdbc.Driver",
"jdbc:mysql://127.0.0.1:3306/XINGXUNTONG", "hadoop", "123456");
Job job = new Job(conf, "test mysql connection");
job.setJarByClass(WriteDataToMysql.class);

job.setMapperClass(ConnMysqlMapper.class);
job.setReducerClass(ConnMysqlReducer.class);

job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);

job.setInputFormatClass(TextInputFormat.class);
job.setOutputFormatClass(DBOutputFormat.class);
FileInputFormat.addInputPath(job, new Path(args[0]));

DBOutputFormat.setOutput(job, "test", "initTime", "new_user_total");
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}