fix bugs and add suitable code for testing

.idea/encodings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>

src/main/java/AnnualIndustrialPowerMapper.java

@@ -1,3 +1,4 @@
+import org.apache.hadoop.io.DoubleWritable;
 import org.apache.hadoop.io.LongWritable;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.mapreduce.Mapper;

src/main/java/Main.java

@@ -1,63 +1,107 @@
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.io.DoubleWritable;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.mapreduce.Job;
 import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
 import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
 
+import java.net.URI;
+import java.util.Scanner;
+
 public class Main {
     public static void main(String[] args) throws Exception {
 
-        if (args.length < 2) {
+//        if (args.length < 2) {
-            System.err.println("Usage: Main <input path> <output path>");
+//            System.err.println("Usage: Main <input path> <output path>");
+//            System.exit(-1);
+//        }
+
+        Scanner sc = new Scanner(System.in);
+        System.out.print("inputPath:");
+        //String inputPath = sc.next();
+        String inputPath = "/mapreduce/BD-exp-2/input";
+        System.out.print("outputPath:");
+        //String outputPathBase = sc.next();
+        String outputPathBase = "/mapreduce/BD-exp-2/output";
+
+        // 检查输入路径是否存在
+        Configuration conf = new Configuration();
+        FileSystem fs = FileSystem.get(new URI("hdfs://master:9000"), conf);
+        if (!fs.exists(new Path(inputPath))) {
+            System.err.println("Input path does not exist: " + inputPath);
             System.exit(-1);
         }
 
-        String inputPath = args[0];
-        String outputPathBase = args[1];
-
         runMonthlyResidentialPowerJob(inputPath, outputPathBase + "/monthly_residential");
         runAnnualIndustrialPowerJob(inputPath, outputPathBase + "/annual_industrial");
         runProvinceMaxDailyPowerJob(inputPath, outputPathBase + "/province_max_daily");
+
+        // 打印结果
+        printResults(outputPathBase + "/monthly_residential");
+        printResults(outputPathBase + "/annual_industrial");
+        printResults(outputPathBase + "/province_max_daily");
+    }
+
+    private static void printResults(String outputPath) throws Exception {
+        Configuration conf = new Configuration();
+        FileSystem fs = FileSystem.get(new URI("hdfs://master:9000"), conf);
+        Path srcPath = new Path(outputPath + "/part-r-00000");
+
+        if (fs.exists(srcPath)) {
+            FSDataInputStream is = fs.open(srcPath);
+            System.out.println("Results from " + outputPath + ":");
+            while (true) {
+                String line = is.readLine();
+                if (line == null) {
+                    break;
+                }
+                System.out.println(line);
+            }
+            is.close();
+        } else {
+            System.err.println("Output file does not exist: " + srcPath);
+        }
     }
 
     private static void runMonthlyResidentialPowerJob(String inputPath, String outputPath) throws Exception {
         Configuration conf = new Configuration();
         Job job = Job.getInstance(conf, "Monthly Residential Power Usage");
-        job.setJarByClass(Main.class);
+        job.setJarByClass(Main.class); // 显式设置Jar文件
         job.setMapperClass(MonthlyResidentialPowerMapper.class);
         job.setReducerClass(MonthlyResidentialPowerReducer.class);
         job.setOutputKeyClass(Text.class);
         job.setOutputValueClass(DoubleWritable.class);
-        FileInputFormat.addInputPath(job, new Path(inputPath));
+        FileInputFormat.addInputPath(job, new Path("hdfs://master:9000" + inputPath));
-        FileOutputFormat.setOutputPath(job, new Path(outputPath));
+        FileOutputFormat.setOutputPath(job, new Path("hdfs://master:9000" + outputPath));
         job.waitForCompletion(true);
     }
 
     private static void runAnnualIndustrialPowerJob(String inputPath, String outputPath) throws Exception {
         Configuration conf = new Configuration();
         Job job = Job.getInstance(conf, "Annual Industrial Power Usage");
-        job.setJarByClass(Main.class);
+        job.setJarByClass(Main.class); // 显式设置Jar文件
         job.setMapperClass(AnnualIndustrialPowerMapper.class);
         job.setReducerClass(AnnualIndustrialPowerReducer.class);
         job.setOutputKeyClass(Text.class);
         job.setOutputValueClass(DoubleWritable.class);
-        FileInputFormat.addInputPath(job, new Path(inputPath));
+        FileInputFormat.addInputPath(job, new Path("hdfs://master:9000" + inputPath));
-        FileOutputFormat.setOutputPath(job, new Path(outputPath));
+        FileOutputFormat.setOutputPath(job, new Path("hdfs://master:9000" + outputPath));
         job.waitForCompletion(true);
     }
 
     private static void runProvinceMaxDailyPowerJob(String inputPath, String outputPath) throws Exception {
         Configuration conf = new Configuration();
         Job job = Job.getInstance(conf, "Province Max Daily Power Usage");
-        job.setJarByClass(Main.class);
+        job.setJarByClass(Main.class); // 显式设置Jar文件
         job.setMapperClass(ProvinceMaxDailyPowerMapper.class);
         job.setReducerClass(ProvinceMaxDailyPowerReducer.class);
         job.setOutputKeyClass(Text.class);
         job.setOutputValueClass(Text.class);
-        FileInputFormat.addInputPath(job, new Path(inputPath));
+        FileInputFormat.addInputPath(job, new Path("hdfs://master:9000" + inputPath));
-        FileOutputFormat.setOutputPath(job, new Path(outputPath));
+        FileOutputFormat.setOutputPath(job, new Path("hdfs://master:9000" + outputPath));
         job.waitForCompletion(true);
     }
 }

src/main/java/MonthlyResidentialPowerMapper.java

@@ -1,3 +1,4 @@
+import org.apache.hadoop.io.DoubleWritable;
 import org.apache.hadoop.io.LongWritable;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.mapreduce.Mapper;