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
@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(); } }