我正在尝试使用cite_95.txt文件获取引用的专利文本。 这是我的MapClass代码：
public static class MapClass
extends Mapper<LongWritable, Text, Text, IntWritable>{
//private final static IntWritable one = new IntWritable(1);
private Text cited = new Text();
private Text citing = new Text();
private IntWritable count = new IntWritable(1);
@Override
public void map(LongWritable key, Text value, Context context
) throws IOException, InterruptedException {
String[] itr = value.toString().split(",");
citing.set(itr[0]);
cited.set(itr[1]);
context.write(cited,count);}}
当我运行这个工作时，它抛出了错误：
错误：java.lang.ArrayIndexOutOfBoundsException：1 为什么它不能得到它的[1]文本？
感谢。
编辑：
嗨，这是我的整个代码示例：
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
public class PatentCount1 {
public static class MapClass
extends Mapper<LongWritable, Text, Text, IntWritable>{
private Text cited = new Text();
private Text citing = new Text();
private IntWritable count = new IntWritable(1);
@Override
public void map(LongWritable key, Text value, Context context
) throws IOException, InterruptedException {
String[] itr = value.toString().split(",");
cited.set(itr[1]);
context.write(cited,count);
}
}
public static class IntSumReducer
extends Reducer<Text,IntWritable,Text,IntWritable> {
private IntWritable result = new IntWritable();
@Override
public void reduce(Text key, Iterable<IntWritable> values,
Context context
) throws IOException, InterruptedException {
int sum = 0;
for (IntWritable val: values) {
sum += val.get();
}
result.set(sum);
context.write(key, result);
}
}
public static void main(String[] args) throws Exception {
Configuration conf = new Configuration();
Job job = Job.getInstance(conf, "word count");
job.setJarByClass(PatentCount1.class);
job.setMapperClass(MapClass.class);
job.setCombinerClass(IntSumReducer.class);
job.setReducerClass(IntSumReducer.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}
当我试图获得第一部分文本时，它可以工作：
cited.set(itr[0]);
context.write(cited,count);
编辑：
输入文件如下：