WIN7下运行hadoop程序报：Failed to locate the winutils binary in the hadoop binary path

    之前在mac上调试hadoop程序（mac之前配置过hadoop环境）一直都是正常的。因为工作需要，需要在windows上先调试该程序，然后再转到linux下。程序运行的过程中，报Failed to locate the winutils binary in the hadoop binary path  java.io.IOException: Could not locate executable nullinwinutils.exe in the Hadoop binaries.

　　通过断点调试、查看源码发现程序需要根据HADOOP_HOME找到winutils.exe,由于win机器并没有配置该环境变量，所以程序报 nullinwinutils.exe。

 private static String checkHadoopHome() {
    // first check the Dflag hadoop.home.dir with JVM scope
    String home = System.getProperty("hadoop.home.dir");

    // fall back to the system/user-global env variable
    if (home == null) {
      home = System.getenv("HADOOP_HOME");
    }
    try {
       // couldn't find either setting for hadoop's home directory
       if (home == null) {
         throw new IOException("HADOOP_HOME or hadoop.home.dir are not set.");
       }
       if (home.startsWith(""") && home.endsWith(""")) {
         home = home.substring(1, home.length()-1);
       }
       // check that the home setting is actually a directory that exists
       File homedir = new File(home);
       if (!homedir.isAbsolute() || !homedir.exists() || !homedir.isDirectory()) {
         throw new IOException("Hadoop home directory " + homedir
           + " does not exist, is not a directory, or is not an absolute path.");
       }
       home = homedir.getCanonicalPath();
    } catch (IOException ioe) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("Failed to detect a valid hadoop home directory", ioe);
      }
      home = null;
    }    
    return home;
  }

　　private static String HADOOP_HOME_DIR = checkHadoopHome();

public static final String getQualifiedBinPath(String executable) 
  throws IOException {
    // construct hadoop bin path to the specified executable
    String fullExeName = HADOOP_HOME_DIR + File.separator + "bin" 
      + File.separator + executable;

    File exeFile = new File(fullExeName);
    if (!exeFile.exists()) {
      throw new IOException("Could not locate executable " + fullExeName
        + " in the Hadoop binaries.");
    }
    return exeFile.getCanonicalPath();
  }

  /** a Windows utility to emulate Unix commands */
  public static final String WINUTILS = getWinUtilsPath();

  public static final String getWinUtilsPath() {
    String winUtilsPath = null;

    try {
      if (WINDOWS) {
        winUtilsPath = getQualifiedBinPath("winutils.exe");
      }
    } catch (IOException ioe) {
       LOG.error("Failed to locate the winutils binary in the hadoop binary path",
         ioe);
    }

    return winUtilsPath;
  }

　　找到原因后就去网上问了度娘，找到了解决方案，很简单，如下：

　　1.下载winutils的windows版本

　　GitHub上，有人提供了winutils的windows的版本，项目地址是：https://github.com/srccodes/hadoop-common-2.2.0-bin,直接下载此项目的zip包，下载后是文件名是hadoop-common-2.2.0-bin-master.zip,随便解压到一个目录

　　2.配置环境变量

　　增加用户变量HADOOP_HOME，值是下载的zip包解压的目录，然后在系统变量path里增加$HADOOP_HOMEin 即可。　　

　　再次运行程序，正常执行。