springMVC源码解析--ViewResolverComposite视图解析器集合（二）

本是古典何须时尚 2022-07-11 01:41 126阅读 0赞

上一篇博客[ springMVC源码分析--ViewResolver视图解析器（一）][springMVC_--ViewResolver]中我们介绍了一些springMVC提供的很多视图解析器ViewResolver，在开发的一套springMVC系统中是可以使用多个视图的，当然就需要配置多个视图解析器了，ViewResolverComposite简单来说就是使用简单的List来保存你配置使用的视图解析器。

ViewResolverComposite中定义了两个变量：

（1）private final List<ViewResolver> viewResolvers = new ArrayList<ViewResolver>();用来存储所有的视图解析器

（2）private int order 用来配置视图解析器的使用顺序。

ViewResolverComposite的源码如下，其没有多少具体的功能，主要就是一个视图解析器集合。

public class ViewResolverComposite implements ViewResolver, Ordered, InitializingBean,
    		ApplicationContextAware, ServletContextAware {
    
    	//用来存储所有的视图解析器
    	private final List<ViewResolver> viewResolvers = new ArrayList<ViewResolver>();
    	//设置视图解析器的执行顺序
    	private int order = Ordered.LOWEST_PRECEDENCE;
    
    	
    	//设置视图解析器
    	public void setViewResolvers(List<ViewResolver> viewResolvers) {
    		this.viewResolvers.clear();
    		if (!CollectionUtils.isEmpty(viewResolvers)) {
    			this.viewResolvers.addAll(viewResolvers);
    		}
    	}
    
    	//获取所有的视图解析器
    	public List<ViewResolver> getViewResolvers() {
    		return Collections.unmodifiableList(this.viewResolvers);
    	}
    	
    	//设置执行顺序
    	public void setOrder(int order) {
    		this.order = order;
    	}
    
    	@Override
    	public int getOrder() {
    		return this.order;
    	}
    	
    	@Override
    	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    		for (ViewResolver viewResolver : this.viewResolvers) {
    			if (viewResolver instanceof ApplicationContextAware) {
    				((ApplicationContextAware)viewResolver).setApplicationContext(applicationContext);
    			}
    		}
    	}
    
    	@Override
    	public void setServletContext(ServletContext servletContext) {
    		for (ViewResolver viewResolver : this.viewResolvers) {
    			if (viewResolver instanceof ServletContextAware) {
    				((ServletContextAware)viewResolver).setServletContext(servletContext);
    			}
    		}
    	}
    	//初始化视图解析器
    	@Override
    	public void afterPropertiesSet() throws Exception {
    		for (ViewResolver viewResolver : this.viewResolvers) {
    			if (viewResolver instanceof InitializingBean) {
    				((InitializingBean) viewResolver).afterPropertiesSet();
    			}
    		}
    	}
    	//生成View对象
    	@Override
    	public View resolveViewName(String viewName, Locale locale) throws Exception {
    		for (ViewResolver viewResolver : this.viewResolvers) {
    			View view = viewResolver.resolveViewName(viewName, locale);
    			if (view != null) {
    				return view;
    			}
    		}
    		return null;
    	}
    
    }

[springMVC_--ViewResolver]: http://blog.csdn.net/qq924862077/article/details/54345494