获取当前jar包的绝对路径

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String jarWholePath = MyClass.class.getProtectionDomain().getCodeSource().getLocation().getFile();  
try {  
    jarWholePath = java.net.URLDecoder.decode(jarWholePath, "UTF-8");  
} catch (UnsupportedEncodingException e) { System.out.println(e.toString()); }  

String jarPath = new File(jarWholePath).getParentFile().getAbsolutePath();