Eclipse本地机提交hadoop程序至集群

用Eclipse提交hadoop 程序提交时总是发现有些类不存在，只好用EJob这个类辅助成功。
这个类主要用于把hadoop程序打包，并从本机发到集群 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;
 
 public class EJob {
 
     // To declare global field
     private static List<URL> classPath = new ArrayList<URL>();
 
     // To declare method
     public static File createTempJar(String root) throws IOException {
         if (!new File(root).exists()) {
             return null;
         }
         Manifest manifest = new Manifest();
         manifest.getMainAttributes().putValue("Manifest-Version", "1.0");
         final File jarFile = File.createTempFile("EJob-", ".jar", new File(
                 System.getProperty("java.io.tmpdir")));
 
         Runtime.getRuntime().addShutdownHook(new Thread() {
             public void run() {
                 jarFile.delete();
             }
         });
 
         JarOutputStream out = new JarOutputStream(
                 new FileOutputStream(jarFile), manifest);
         createTempJarInner(out, new File(root), "");
         out.flush();
         out.close();
         return jarFile;
     }
 
     private static void createTempJarInner(JarOutputStream out, File f,
             String base) throws IOException {
         if (f.isDirectory()) {
             File[] fl = f.listFiles();
             if (base.length() > 0) {
                 base = base + "/";
             }
             for (int i = 0; i < fl.length; i++) {
                 createTempJarInner(out, fl[i], base + fl[i].getName());
             }
         } else {
             out.putNextEntry(new JarEntry(base));
             FileInputStream in = new FileInputStream(f);
             byte[] buffer = new byte[1024];
             int n = in.read(buffer);
             while (n != -1) {
                 out.write(buffer, 0, n);
                 n = in.read(buffer);
             }
             in.close();
         }
     }
 
     public static ClassLoader getClassLoader() {
         ClassLoader parent = Thread.currentThread().getContextClassLoader();
         if (parent == null) {
             parent = EJob.class.getClassLoader();
         }
         if (parent == null) {
             parent = ClassLoader.getSystemClassLoader();
         }
         return new URLClassLoader(classPath.toArray(new URL[0]), parent);
     }
 
     public static void addClasspath(String component) {
 
         if ((component != null) && (component.length() > 0)) {
             try {
                 File f = new File(component);
 
                 if (f.exists()) {
                     URL key = f.getCanonicalFile().toURL();
                     if (!classPath.contains(key)) {
                         classPath.add(key);
                     }
                 }
             } catch (IOException e) {
             }
         }
     }
 
 }

 

import java.io.File;
import java.io.IOException;
import java.util.StringTokenizer;

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.mapred.JobConf;
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 WordCount {

	public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable> {

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

		public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
			StringTokenizer itr = new StringTokenizer(value.toString());
			while (itr.hasMoreTokens()) {
				word.set(itr.nextToken());
				context.write(word, one);
			}
		}
	}

	public static class IntSumReducer 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);
		}
	}

	public static void main(String[] args) throws Exception {
		File jarFile = EJob.createTempJar("bin");
		ClassLoader classLoader = EJob.getClassLoader();
		Thread.currentThread().setContextClassLoader(classLoader);
		Configuration conf = new Configuration();

		conf.set("mapred.job.tracker", "bfdbjc1:12001");
		Job job = new Job(conf, "word count");
		job.setJarByClass(WordCount.class);
		job.setMapperClass(TokenizerMapper.class);
		job.setCombinerClass(IntSumReducer.class);
		job.setReducerClass(IntSumReducer.class);
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(IntWritable.class);
		FileInputFormat.addInputPath(job, new Path("hdfs://bfdbjc1:12000/user/work/a.txt"));
		//本地提交至集群的时候得有写权限
		FileOutputFormat.setOutputPath(job, new Path("hdfs://bfdbjc1:12000/user/work/output/20130528_12"));
		
		//Eclipse 本地提交
		((JobConf) job.getConfiguration()).setJar(jarFile.toString());
		
		System.exit(job.waitForCompletion(true) ? 0 : 1);
	}
}