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("dubbo://admin:hello1234@10.20.130.230:20880");
        assertEquals("dubbo", url.getProtocol());
        assertEquals("admin", url.getUsername());
        assertEquals("hello1234", url.getPassword());
        assertEquals("10.20.130.230", url.getHost());
        assertEquals(20880, url.getPort());
        assertEquals(null, url.getPath());
        assertEquals(0, url.getParameters().size());
        url = URL.valueOf("dubbo://admin:hello1234@10.20.130.230:20880?version=1.0.0");
        assertEquals("dubbo", url.getProtocol());
        assertEquals("admin", url.getUsername());
        assertEquals("hello1234", url.getPassword());
        assertEquals("10.20.130.230", url.getHost());
        assertEquals(20880, url.getPort());
        assertEquals(null, url.getPath());
        assertEquals(1, url.getParameters().size());
        assertEquals("1.0.0", url.getParameter("version"));
        url = URL.valueOf("dubbo://admin:hello1234@10.20.130.230:20880/context/path?version=1.0.0&application=morgan");
        assertEquals("dubbo", 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());