java运行TestNG测试套件.xml文件

背景：想用java代码执行测试套件

DemoSuit.xml
<suite name="DemoSuite" >
    <test name="DemoTest" >
            <classes>
                <class name="test.case.demo"/>
            <classes>
    </test>
</suite>

main.java

XmlSuite suite = new XmlSuite();
suite.setName("DemoSuite");
XmlTest test = new XmlTest(suite);
test.setName("DemoTest");
List<XmlClass> classes = new ArrayList<XmlClass>();
classes.add(new XmlClass("test.case.demo"));
test.setXmlClasses(classes)

List<XmlSuite> suites = new ArrayList<XmlSuite>();
suites.add(suite);
TestNG tng = new TestNG();
tng.setXmlSuites(suites);
tng.run();