请看下面的代码
Map.java

public class Map extends Mapper<longwritable, intwritable="" text,=""> {
 private final static IntWritable one = new IntWritable(1);
 private Text word = new Text();
 @Override
 public void map(LongWritable key, Text value, Context context)
   throws IOException, InterruptedException {
  String line = value.toString();
  StringTokenizer tokenizer = new StringTokenizer(line);
  while (tokenizer.hasMoreTokens()) {
   word.set(tokenizer.nextToken());
   context.write(word, one);
  }
 }
}
</longwritable,>

减少.java

public class Reduce extends Reducer<text, intwritable,="" intwritable="" text,=""> {
 @Override
 protected void reduce(
   Text key,
   java.lang.Iterable<intwritable> values,
   org.apache.hadoop.mapreduce.Reducer<text, intwritable,="" intwritable="" text,="">.Context context)
   throws IOException, InterruptedException {
  int sum = 0;
  for (IntWritable value : values) {
   sum += value.get();
  }
  context.write(key, new IntWritable(sum));
 }
}
</text,></intwritable></text,>

字数.java

public class WordCount {
    public static void main(String[] args) throws Exception {
          Configuration conf = new Configuration();
          Job job = new Job(conf, "wordcount");
          job.setJarByClass(WordCount.class);
          job.setOutputKeyClass(Text.class);
          job.setOutputValueClass(IntWritable.class);
          job.setMapperClass(Map.class);
          job.setReducerClass(Reduce.class);
          job.setInputFormatClass(TextInputFormat.class);
          job.setOutputFormatClass(TextOutputFormat.class);
          FileInputFormat.addInputPath(job, new Path(args[0]));
          FileOutputFormat.setOutputPath(job, new Path(args[1]));
          job.waitForCompletion(true);
        }
}

整个代码都是从这个 Map Reduce 教程(http://cloud.dzone.com/articles/how-run-elastic-mapreduce-job)
. 当我将这些类复制到eclipse中时，它显示了很多错误，比如cannotbe Resolved By Type . 这是合理的，因为此代码用作示例的类在默认jdk中找不到，而且教程也没有给出下载任何库的任何说明。我忽略了它，以为它与 Elastic Map Reduce 在服务器端。
当我把这个上传到amazonelasticmapreduce，创建了一个作业流并运行了这个程序，它给了我以下错误。

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    Configuration cannot be resolved to a type
    Configuration cannot be resolved to a type
    Job cannot be resolved to a type
    Job cannot be resolved to a type
    Text cannot be resolved to a type
    IntWritable cannot be resolved to a type
    TextInputFormat cannot be resolved to a type
    TextOutputFormat cannot be resolved to a type
    FileInputFormat cannot be resolved
    Path cannot be resolved to a type
    FileOutputFormat cannot be resolved
    Path cannot be resolved to a type
    at WordCount.main(WordCount.java:5)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:187)

我怎样才能使这个代码工作？我需要下载图书馆吗？如何运行此代码并查看结果？这是我在amazon和elastic map reduce的第一次体验，也是第一次体验大数据。
请帮忙。