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`
Map<String, String> params = new HashMap<String, String>();
        params.put("p1", "v1");
        params.put("p2", "v2");
        assertEquals(params, url.getParameters());
        url = URL.valueOf("file:/home/user1/router.js?p1=v1&p2=v2");
        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(2, url.getParameters().size());
        params = new HashMap<String, String>();
        params.put("p1", "v1");
        params.put("p2", "v2");
        assertEquals(params, url.getParameters());
    }
    @Test
    public void test_valueOf_WithProtocolHost() throws Exception {
        URL url = URL.valueOf("dubbo://10.20.130.230");
        assertEquals("dubbo", url.getProtocol());
        assertNull(url.getUsername());
        assertNull(url.getPassword());
        assertEquals("10.20.130.230", url.getHost());
        assertEquals(0, url.getPort());
        assertEquals(null, url.getPath());
        assertEquals(0, url.getParameters().size());
        url = URL.valueOf("dubbo://10.20.130.230:20880/context/path");
        assertEquals("dubbo", url.getProtocol());
        assertNull(url.getUsername());