1. non-simplify mode:
```
dubbo://120.0.0.1:20880/org.apache.dubbo.demo.DemoService?key=value
```
the store path of ZK will be: `/dubbo/porg.apache.dubbo.demo.DemoService/url`

2. simplify mode:
```
dubbo://120.0.0.1:20880/org.apache.dubbo.demo.DemoService?key=value
```
the store path of ZK will be: `/dubbo/porg.apache.dubbo.demo.DemoService/url`

3. simplify mode with path specified:
```
dubbo://120.0.0.1:20880/path-value?key=value
```
the store path of ZK will be: `/dubbo/path-value/url`
assertNull(url.getPassword());
        assertEquals("10.20.130.230", url.getHost());
        assertEquals(20880, url.getPort());
        assertEquals("context/path", url.getPath());
        assertEquals(0, url.getParameters().size());
        url = URL.valueOf("admin:hello1234@10.20.130.230:20880/context/path?version=1.0.0&application=morgan");
        assertNull(url.getProtocol());
        assertEquals("admin", url.getUsername());
        assertEquals("hello1234", url.getPassword());
        assertEquals("10.20.130.230", url.getHost());
        assertEquals(20880, url.getPort());
        assertEquals("context/path", url.getPath());
        assertEquals(2, url.getParameters().size());
        assertEquals("1.0.0", url.getParameter("version"));
        assertEquals("morgan", url.getParameter("application"));
    }
    @Test
    public void test_valueOf_noHost() throws Exception {
        URL url = URL.valueOf("file:///home/user1/router.js");
        assertEquals("file", url.getProtocol());
        assertNull(url.getUsername());
        assertNull(url.getPassword());
        assertNull(url.getHost());
        assertEquals(0, url.getPort());
        assertEquals("home/user1/router.js", url.getPath());
        assertEquals(0, url.getParameters().size());
        
        url = URL.valueOf("file://home/user1/router.js");
        
        assertEquals("file", url.getProtocol());