java获得当前文件路径

第一种： 
File f = new File(this.getClass().getResource("/").getPath()); 
System.out.println(f); 
结果: 
C:\Documents%20and%20Settings\Administrator\workspace\projectName\bin 
获取当前类的所在工程路径; 
如果不加“/” 
File f = new File(this.getClass().getResource("").getPath()); 
System.out.println(f); 
结果： 
C:\Documents%20and%20Settings\Administrator\workspace\projectName\bin\com\test 
获取当前类的绝对路径； 

第二种： 
File directory = new File("");//参数为空 
String courseFile = directory.getCanonicalPath() ; 
System.out.println(courseFile); 
结果： 
C:\Documents and Settings\Administrator\workspace\projectName 
获取当前类的所在工程路径; 

第三种： 
URL xmlpath = this.getClass().getClassLoader().getResource("selected.txt"); 
System.out.println(xmlpath); 
结果： 
file:/C:/Documents%20and%20Settings/Administrator/workspace/projectName/bin/selected.txt 
获取当前工程src目录下selected.txt文件的路径 

第四种： 
System.out.println(System.getProperty("user.dir")); 
结果： 
C:\Documents and Settings\Administrator\workspace\projectName 
获取当前工程路径 

第五种： 
System.out.println( System.getProperty("java.class.path")); 
结果： 
C:\Documents and Settings\Administrator\workspace\projectName\bin 
获取当前工程路径

 

from:http://www.cnblogs.com/lostyue/archive/2011/06/27/2091686.html

 

  /** 
         * 通过工程相对路径读取（包内）文件，注意不以“/”开头 
         */ 
        public static void readTextA_ByProjectRelativePath() { 
                System.out.println("-----------------readTextA_ByProjectRelativePath---------------------"); 
                File f = new File("src/com/lavasoft/res/a.txt"); 
                String a = file2String(f, "GBK"); 
                System.out.println(a); 
        } 

        /** 
         * 通过工程相对路径读取（包外）文件，注意不以“/”开头 
         */ 
        public static void readTextB_ByProjectRelativePath() { 
                System.out.println("-----------------readTextB_ByProjectRelativePath---------------------"); 
                File f = new File("doc/b.txt"); 
                String b = file2String(f, "GBK"); 
                System.out.println(b); 
        } 


        /** 
         * 通过CLASSPATH读取包内文件，注意以“/”开头 
         */ 
        public static void readTextA_ByClassPath() { 
                System.out.println("-----------------readTextA_ByClassPath---------------------"); 
                InputStream in = ReadFile.class.getResourceAsStream("/com/lavasoft/res/a.txt"); 
                String a = stream2String(in, "GBK"); 
                System.out.println(a); 
        } 

        /** 
         * 文件转换为字符串 
         * 
         * @param f             文件 
         * @param charset 文件的字符集 
         * @return 文件内容 
         */ 
        public static String file2String(File f, String charset) { 
                String result = null; 
                try { 
                        result = stream2String(new FileInputStream(f), charset); 
                } catch (FileNotFoundException e) { 
                        e.printStackTrace(); 
                } 
                return result; 
        } 

 

 /** 
         * 文件转换为字符串 
         * 
         * @param in            字节流 
         * @param charset 文件的字符集 
         * @return 文件内容 
         */ 
        public static String stream2String(InputStream in, String charset) { 
                StringBuffer sb = new StringBuffer(); 
                try { 
                        Reader r = new InputStreamReader(in, charset); 
                        int length = 0; 
                        for (char[] c = new char[1024]; (length = r.read(c)) != -1;) { 
                                sb.append(c, 0, length); 
                        } 
                        r.close(); 
                } catch (UnsupportedEncodingException e) { 
                        e.printStackTrace(); 
                } catch (FileNotFoundException e) { 
                        e.printStackTrace(); 
                } catch (IOException e) { 
                        e.printStackTrace(); 
                } 
                return sb.toString(); 
        } 

 

package first.second;

import java.io.File;

public class GetPath {

	public static void getPath()
	{
		//方式一
		System.out.println(System.getProperty("user.dir"));
		//方式二
		File directory = new File("");//设定为当前文件夹
		try{
		    System.out.println(directory.getCanonicalPath());//获取标准的路径
		    System.out.println(directory.getAbsolutePath());//获取绝对路径
		}catch(Exception e)
		{
			e.printStackTrace();
		}
		//方式三
		System.out.println(GetPath.class.getResource("/"));
		System.out.println(GetPath.class.getResource(""));
		//方式4
		System.out.println(GetPath.class.getClassLoader().getResource(""));
		System.out.println(GetPath.class.getClassLoader().getResource("source.xml"));
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		GetPath.getPath();
	}

}