https://blog.csdn.net/weixin_37647084/article/details/60866211
在上一博客中我们介绍了handlerMap有一个注册url和Handler关系的注册函数,这个函数的调用是在实现类SimpleUrlHandlerMapping中实现的,目的是springMVC容器启动时将url和handler的对应关系注册到handlerMap中。
SimpleUrlHandlerMapping有一个初始化容器上下问的操作,调用父类的super.initApplicationContext会将bean注入到容器中,registerHandlers将url和Handler的对应关系注册到urlMap中,容器初始化之后会调用setMappings或者setUrlMap将url和handler的对应关系注册的urlMap中。
public void setMappings(Properties mappings) {
CollectionUtils.mergePropertiesIntoMap(mappings, this.urlMap);
}
public void setUrlMap(Map<String, ?> urlMap) {
this.urlMap.putAll(urlMap);
}
//重写父类的方法,注册到父类的map中
@Override
public void initApplicationContext() throws BeansException {
super.initApplicationContext();
registerHandlers(this.urlMap);
}
registerHandlers的实现如下,会调用上一篇博客中我们介绍的registerHandler函数,完成url和handler的关系注册。
//将所有的url和Handler的对应关系放到父类AbstractURLHandlerMapping的map中
protected void registerHandlers(Map<String, Object> urlMap) throws BeansException {
if (urlMap.isEmpty()) {
logger.warn("Neither 'urlMap' nor 'mappings' set on SimpleUrlHandlerMapping");
}
else {
for (Map.Entry<String, Object> entry : urlMap.entrySet()) {
String url = entry.getKey();
Object handler = entry.getValue();
// Prepend with slash if not already present.
if (!url.startsWith("/")) {
url = "/" + url;
}
// Remove whitespace from handler bean name.
if (handler instanceof String) {
handler = ((String) handler).trim();
}
registerHandler(url, handler);
}
}
}
//将所有的url和Handler的对应关系放到父类AbstractURLHandlerMapping的map中
public class SimpleUrlHandlerMapping extends AbstractUrlHandlerMapping {
private final Map<String, Object> urlMap = new HashMap<String, Object>();
public void setMappings(Properties mappings) {
CollectionUtils.mergePropertiesIntoMap(mappings, this.urlMap);
}
public void setUrlMap(Map<String, ?> urlMap) {
this.urlMap.putAll(urlMap);
}
public Map<String, ?> getUrlMap() {
return this.urlMap;
}
//重写父类的方法,注册到父类的map中
@Override
public void initApplicationContext() throws BeansException {
super.initApplicationContext();
registerHandlers(this.urlMap);
}
//将所有的url和Handler的对应关系放到父类AbstractURLHandlerMapping的map中
protected void registerHandlers(Map<String, Object> urlMap) throws BeansException {
if (urlMap.isEmpty()) {
logger.warn("Neither 'urlMap' nor 'mappings' set on SimpleUrlHandlerMapping");
}
else {
for (Map.Entry<String, Object> entry : urlMap.entrySet()) {
String url = entry.getKey();
Object handler = entry.getValue();
// Prepend with slash if not already present.
if (!url.startsWith("/")) {
url = "/" + url;
}
// Remove whitespace from handler bean name.
if (handler instanceof String) {
handler = ((String) handler).trim();
}
registerHandler(url, handler);
}
}
}
}