Spring 源码解析（二）加载配置文件2

 //org.springframework.web.context.ContextLoader.class
 1     protected void configureAndRefreshWebApplicationContext(ConfigurableWebApplicationContext wac, ServletContext sc) {
 2         if (ObjectUtils.identityToString(wac).equals(wac.getId())) {
 3             // The application context id is still set to its original default value
 4             // -> assign a more useful id based on available information
 5             String idParam = sc.getInitParameter(CONTEXT_ID_PARAM);
 6             if (idParam != null) {
 7                 wac.setId(idParam);
 8             }
 9             else {
10                 // Generate default id...
11                 wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX +
12                         ObjectUtils.getDisplayString(sc.getContextPath()));
13             }
14         }
15 
16         wac.setServletContext(sc);
17         String configLocationParam = sc.getInitParameter(CONFIG_LOCATION_PARAM);
18         if (configLocationParam != null) {
19 wac.setConfigLocation(configLocationParam);
20         }
21 
22         // The wac environment‘s #initPropertySources will be called in any case when the context
23         // is refreshed; do it eagerly here to ensure servlet property sources are in place for
24         // use in any post-processing or initialization that occurs below prior to #refresh
25         ConfigurableEnvironment env = wac.getEnvironment();
26         if (env instanceof ConfigurableWebEnvironment) {
27             ((ConfigurableWebEnvironment) env).initPropertySources(sc, null);
28         }
29 
30         customizeContext(sc, wac);
31         wac.refresh();
32     }