eclipse实现基于Hadoop的高考高频词汇分析代码
时间: 2024-12-05 11:11:12 浏览: 34
在Eclipse中实现基于Hadoop的高考高频词汇分析,通常需要几个步骤:
1. **安装配置**:首先,你需要在Eclipse里安装Hadoop插件,如Maven或Eclipse Hadoop工具包,以便支持Hadoop项目的开发。
2. **项目设置**:创建一个新的Maven项目,然后配置pom.xml文件,添加Hadoop的依赖,例如`hadoop-client`、`hadoop-mapreduce-client-jobclient`等。
3. **数据处理**:使用MapReduce API编写Mapper和Reducer。Mapper负责读取文本数据(如历年高考试卷),对每一行进行分词,将每个单词作为键,频率作为值。Reducer则会对键值对进行合并,计算每个单词的总频率。
```java
// Mapper示例
public class WordCountMapper extends Mapper<LongWritable, Text, Text, IntWritable> {
private final static IntWritable one = new IntWritable(1);
private Text word = new Text();
public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
String[] words = value.toString().split("\\s+");
for (String w : words) {
word.set(w);
context.write(word, one);
}
}
}
// Reducer示例
public class WordCountReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
private IntWritable result = new IntWritable();
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);
}
}
```
4. **作业提交**:将MapReduce任务打包成jar文件,并通过Hadoop命令行工具(如`hadoop jar`)在集群上运行。
5. **结果查询**:最后,从Hadoop JobTracker或现在的新NameNode上查看生成的结果文件,它们通常是排序后的高频词列表。
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