打开文件
//打开工具的路径及名字 
 String toolsPath = "C:/WINDOWS/system32/notepad.exe "; 
 //被打开文件的路径及名字 
 String fileName = "test.txt"; 
 try { 
 Runtime.getRuntime().exec(toolsPath+fileName); 
 } catch (IOException e) { 
 // TODO Auto-generated catch block 
 e.printStackTrace(); 
 } 
打开文件夹
try {
 String[] cmd = new String[5];
 String url = "C:/input";
 cmd[0] = "cmd";
 cmd[1] = "/c";
 cmd[2] = "start";
 cmd[3] = " ";
 cmd[4] = url;
 Runtime.getRuntime().exec(cmd);
 } catch (IOException e) {
 e.printStackTrace();
 }
或者
Runtime.getRuntime().exec("cmd /c start C:/input");
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