springMVC源码分析--ControllerBeanNameHandlerMapping（八）

深碍√TFBOYSˉ_ 2022-07-13 02:10 142阅读 0赞

在上一篇博客[springMVC源码分析--AbstractControllerUrlHandlerMapping（六）][springMVC_--AbstractControllerUrlHandlerMapping]中我们介绍到AbstractControllerUrlHandlerMapping定义了抽象方法buildUrlsForHandler，接下来我们看看在其子类ControllerBeanNameHandlerMapping中的实现。

![Image 1][]

ControllerBeanNameHandlerMapping中buildUrlsForHandler的实现如下，还是讲beanName及其别名作为url

@Override
    	protected String[] buildUrlsForHandler(String beanName, Class<?> beanClass) {
    		List<String> urls = new ArrayList<String>();
    		urls.add(generatePathMapping(beanName));
    		String[] aliases = getApplicationContext().getAliases(beanName);
    		for (String alias : aliases) {
    			urls.add(generatePathMapping(alias));
    		}
    		return StringUtils.toStringArray(urls);
    	}

generatePathMapping函数中的实现是给beanName加上以下前缀等。

protected String generatePathMapping(String beanName) {
    		String name = (beanName.startsWith("/") ? beanName : "/" + beanName);
    		StringBuilder path = new StringBuilder();
    		if (!name.startsWith(this.urlPrefix)) {
    			path.append(this.urlPrefix);
    		}
    		path.append(name);
    		if (!name.endsWith(this.urlSuffix)) {
    			path.append(this.urlSuffix);
    		}
    		return path.toString();
    	}

和其他的实现子类一样，ControllerBeanNameHandlerMapping实现的功能很简单，就是将beanName及其别名作为url返回。

ControllerBeanNameHandlerMapping源码如下：

public class ControllerBeanNameHandlerMapping extends AbstractControllerUrlHandlerMapping {
    
    	private String urlPrefix = "";
    
    	private String urlSuffix = "";
    
    	public void setUrlPrefix(String urlPrefix) {
    		this.urlPrefix = (urlPrefix != null ? urlPrefix : "");
    	}
    
    	public void setUrlSuffix(String urlSuffix) {
    		this.urlSuffix = (urlSuffix != null ? urlSuffix : "");
    	}
    
    	//通过beanName构造url数组
    	@Override
    	protected String[] buildUrlsForHandler(String beanName, Class<?> beanClass) {
    		List<String> urls = new ArrayList<String>();
    		urls.add(generatePathMapping(beanName));
    		String[] aliases = getApplicationContext().getAliases(beanName);
    		for (String alias : aliases) {
    			urls.add(generatePathMapping(alias));
    		}
    		return StringUtils.toStringArray(urls);
    	}
    	//给beanName添加配置的前缀
    	protected String generatePathMapping(String beanName) {
    		String name = (beanName.startsWith("/") ? beanName : "/" + beanName);
    		StringBuilder path = new StringBuilder();
    		if (!name.startsWith(this.urlPrefix)) {
    			path.append(this.urlPrefix);
    		}
    		path.append(name);
    		if (!name.endsWith(this.urlSuffix)) {
    			path.append(this.urlSuffix);
    		}
    		return path.toString();
    	}
    
    }

[springMVC_--AbstractControllerUrlHandlerMapping]: http://blog.csdn.net/qq924862077/article/details/53760945
[Image 1]: