springMVC源码分析--ControllerBeanNameHandlerMapping（八）

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();
}

}