springMVC源码分析--ControllerBeanNameHandlerMapping（八）

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在上一篇博客springMVC源码分析--AbstractControllerUrlHandlerMapping（六）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。

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

@Overrideprotected 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@Overrideprotected 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();}}

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