java获取程序当前目录。

核心提示：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 val

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;
}