一步一步写一个java web开发框架(3)

一步一步写一个java web开发框架(1)

一步一步写一个java web开发框架(2)

承接上文。StrutsContext类的实现。

初始化,创建ActionMap,扫描所有Action,将Action注册到filter里。

public StrutsContext(ServletContext servlet) {
		actionList = new HashMap<>();
		scanPaths(servlet, servlet.getResourcePaths(STR.SLASH_LEFT));
		addMapping(servlet.getFilterRegistration("StrutsFilter"));
	}

扫描所有Action,并解析后,加入到Action列表

private void scanPaths(ServletContext arg1, Set<String> paths) {
		if (paths != null) {
			for (String path : paths) {
				if (path.endsWith(STR.SLASH_LEFT))
					scanPaths(arg1, arg1.getResourcePaths(path));
				else {
					if (path.endsWith(STR.SUBFIX_CLASS)) {
						Class<?> cla = getClass(path);
						if (cla != null && !cla.isInterface()) {
							if (isAction(cla))
								bindAction(cla);
						}
					}
				}
			}
		}
	}

	private void bindAction(Class<?> cla) {
		String pkg = getMappingPath(cla);
		Method[] methods = cla.getMethods();
		String action;
		for (Method method : methods) {
			// 获取request路径
			action = getMappingPath(pkg, method);
			if (action != null) {
				// 将有action链接的方法加入列表
				actionList.put(action, new ActionMapper(method));
			}
		}
	}

	public static String getMappingPath(Class<?> cla) {
		RequestMapping rm = cla.getAnnotation(RequestMapping.class);
		if (rm != null)
			return rm.value();
		return "";
	}

将Action添加到filter中,过滤所有配置的Action链接

private void addMapping(FilterRegistration filterRegistration) {
		Set<String> actions = actionList.keySet();
		EnumSet<DispatcherType> dispatcherTypes = EnumSet.allOf(DispatcherType.class);
		dispatcherTypes.add(DispatcherType.REQUEST);
		dispatcherTypes.add(DispatcherType.FORWARD);
		for (String action : actions) {
			filterRegistration.addMappingForUrlPatterns(dispatcherTypes, true, action);
		}
	}

RequestMapping注解实现

@Retention(RUNTIME)
@Target(value = { ElementType.TYPE, ElementType.METHOD })
public @interface RequestMapping {
	String value() default "";
}

StrutsContext已经将所有的Action链接获取到了,下一步怎么办呢?

请看下一节。 一步一步写一个java web开发框架(4)

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转载自blog.csdn.net/zml_moxueli/article/details/81185996