Spring MVC的handlermapping之SimpleUrlHandlerMapping初始化

前面信息同BeanNameUrlHandlerMapping,这里不再过多分析，详情请看 : Spring MVC的handlermapping之BeanNameUrlHandlerMapping初始化

同样先上类图：

可以看到SimpleUrlHandlerMapping是直接继承AbstractUrlHandlerMapping的

public class SimpleUrlHandlerMapping extends AbstractUrlHandlerMapping {
    private final Map<String, Object> urlMap = new HashMap(); //用来保存url和handler的映射关系。

    public SimpleUrlHandlerMapping() {
    }

    public void setMappings(Properties mappings) { //通过spring自动注入，mapping属性值
        CollectionUtils.mergePropertiesIntoMap(mappings, this.urlMap);
    }

    public void setUrlMap(Map<String, ?> urlMap) { //通过spring自动注入，urlMap的值
        this.urlMap.putAll(urlMap);
    }

    public Map<String, ?> getUrlMap() {
        return this.urlMap;
    }

    public void initApplicationContext() throws BeansException { //重写方法，自己搞定注册处理器逻辑
        super.initApplicationContext();
        this.registerHandlers(this.urlMap);
    }

    protected void registerHandlers(Map<String, Object> urlMap) throws BeansException {
        String url;
        Object handler;
        if (urlMap.isEmpty()) {
            this.logger.warn("Neither 'urlMap' nor 'mappings' set on SimpleUrlHandlerMapping");
        } else { //遍历map,对url和handler进行合法性修补，最后调用父类进行注册处理器
            for(Iterator i$ = urlMap.entrySet().iterator(); i$.hasNext(); this.registerHandler(url, handler)) {
                Entry<String, Object> entry = (Entry)i$.next();
                url = (String)entry.getKey();
                handler = entry.getValue();
                if (!url.startsWith("/")) {
                    url = "/" + url;
                }

                if (handler instanceof String) {
                    handler = ((String)handler).trim();
                }
            }
        }

    }
}