java获取程序当前目录。

2019-11-17 04:04:03

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import java.net.URL;
import java.net.URLDecoder;

public class PathUtil
{
/**
  * Get the env of windir, such as "C:/WINDOWS".
  * @return the env of windir value.
  */
public static String getWindir(){
  return System.getenv("windir");
}

/**
  * Get file separator, such as "/" on unix.
  *
  * @return the separator of file.
  */
public static String getFileSeparator()
{
  return System.getPRoperty("file.separator");
}

/**
  * Get line separator, such as "/n" on unix.
  *
  * @return the separator of line.
  */
public static String getLineSeparator()
{
  return System.getProperty("line.separator");
}

/**
  * Get programPath
  *
  * @return programPath
  */
public static String getProgramPath()
{
  Class<PathUtil> cls = PathUtil.class;
  ClassLoader loader = cls.getClassLoader();
  //
  // Get the full name of the class.
  //
  String clsName = cls.getName() + ".class";
  //
  // Get the package that include the class.
  //
  Package pack = cls.getPackage();
  String path = "";
  //
  // Transform package name to path.
  //
  if(pack != null)
  {
   String packName = pack.getName();
   //
   // Get the class's file name.
   //
   clsName = clsName.substring(packName.length() + 1);
   //
   // If package is simple transform package name to path directly,
   // else transform package name to path by package name's
   // constituent.
   //
   path = packName;
   if(path.indexOf(".") > 0)
   {
    path = path.replace(".", "/");
   }
   path = path + "/";
  }

  URL url = loader.getResource(path + clsName);
  //
  // Get path information form the instance of URL.
  //
  String retPath = url.getPath();
  //
  // Delete protocol name "file:" form path information.
  //
  try
  {
   int pos = retPath.indexOf("file:");
   if(pos > -1)
   {
    retPath = retPath.substring(pos + 5);
   }
   //
   // Delete the information of class file from the information of
   // path.
   //
   pos = retPath.indexOf(path + clsName);
   retPath = retPath.substring(0, pos - 1);
   //
   // If the class file was packageed into JAR e.g. file, delete the
   // file name of the corresponding JAR e.g..
   //
   if(retPath.endsWith("!"))
   {
    retPath = retPath.substring(0, retPath.lastIndexOf("/"));
   }

   retPath = URLDecoder.decode(retPath, "utf-8");
  }
  catch(Exception e)
  {
   retPath = null;
   System.out.println(e.toString());
  }

  return retPath;
}

}

  URL url = loader.getResource(path + clsName);
  //
  // Get path information form the instance of URL.
  //
  String retPath = url.getPath();
  //
  // Delete protocol name "file:" form path information.
  //
  try
  {
   int pos = retPath.indexOf("file:");
   if(pos > -1)
   {
    retPath = retPath.substring(pos + 5);
   }
   //
   // Delete the information of class file from the information of
   // path.
   //
   pos = retPath.indexOf(path + clsName);
   retPath = retPath.substring(0, pos - 1);
   //
   // If the class file was packageed into JAR e.g. file, delete the
   // file name of the corresponding JAR e.g..
   //
   if(retPath.endsWith("!"))
   {
    retPath = retPath.substring(0, retPath.lastIndexOf("/"));
   }

   retPath = URLDecoder.decode(retPath, "utf-8");
  }
  catch(Exception e)
  {
   retPath = null;
   System.out.println(e.toString());
  }

  return retPath;
}

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