java调用批处理（doc）执行多条命令

String CurPaths = System.getProperty("user.dir");
String CurPath = CurPaths+"\\jdk1.7.0_67\\bin;";
String Paths = System.getProperty("java.library.path"); 
System.out.println("Paths=="+Paths);
String Path = CurPath+Paths; 

// System.setProperty("java.library.path",Path);
System.out.println("Path=="+Path);
try {
String pathlast = "cmd /c set Path="+Path+ " && cmd /c start javaw -jar "+CurPaths+"/trggrrr.jar";

//批处理doc命令在java调用多条命令执行的时候需要用&&来连接起来，命令在项目中正常使用，没有问题

Runtime.getRuntime().exec(pathlast);

// Process process = Runtime.getRuntime().exec("cmd /c set Path="+Path );

// Runtime.getRuntime().exec("cmd /c start javaw -jar "+CurPaths+"/trggrrr.jar");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} 

}