Spring架构增强MultiActionController(3)

我们可以在MultiActionController中定义一个PropertiesMethodNameResolver类型的成员变量“propertiesMethodNameResoler”。和定义一个Properties类型的成员变量“urlMethodmappings”在MultiActionController的bean进行配置的时候把urlMethodmappings的值作为propertiesMethodNameResoler的mapping的值。然后再调用MultiActionController的setMethodNameResolver()方法，把propertiesMethodNameResoler设置为MultiActionController的methodNameResolver的属性值。要做到这一些还应该实现InitializingBean接口。

public class MultiMethodController extends MultiActionController implements InitializingBean ...{ private Properties urlMethodmappings; public void afterPropertiesSet() throws Exception ...{ if (urlMethodmappings != null && !urlMethodmappings.isEmpty()) ...{ PropertiesMethodNameResolver propertiesMethodNameResolver = new PropertiesMethodNameResolver(); propertiesMethodNameResolver.setMappings(urlMethodmappings); this.setMethodNameResolver(propertiesMethodNameResolver); if (this.logger.isInfoEnabled()) ...{ this.logger.info("binding success...... "); } } else ...{ logger.info("no 'urlMethodmappings' set on MultiMethodController"); } } /**//** * @return Returns the urlMethodmappings. */ public Properties getUrlMethodmappings() ...{ return urlMethodmappings; } /**//** * @param urlMethodmappings * The urlMethodmappings to set. */ public void setUrlMethodmappings(Properties urlMethodmappings) ...{ this.urlMethodmappings = urlMethodmappings; } }

在afterPropertiesSet中，

PropertiesMethodNameResolver propertiesMethodNameResolver = new PropertiesMethodNameResolver();

创建一个默认的PropertiesMethodNameResolver的实例

propertiesMethodNameResolver.setMappings(urlMethodmappings);

把urlMethodmappings作为propertiesMethodNameResolver的mapping属性值

this.setMethodNameResolver(propertiesMethodNameResolver);

调用父类方法，把propertiesMethodNameResolver注入MethodNameResolver属性中。

注意，在这里我命名为MultiMethodController是为了与MultiActionController区别。

通过这样的代码，简化了原本复杂的配置。

4.2通过一个commandName属性，可以让用户自由决定绑定对象的名称

MultiActionController的getCommandName如下：

public static final String DEFAULT_COMMAND_NAME = "command"; protected String getCommandName(Object command) ...{ return DEFAULT_COMMAND_NAME; }

MultiActionController并没有一个setCommandName的方法，所以我们需要一个setCommandName的方法,然后重写getCommandName(Object command)方法

private String commandName =DEFAULT_COMMAND_NAME; public String getCommandName() ...{ return commandName; } public void setCommandName(String commandName) ...{ this.commandName = commandName; } protected String getCommandName(Object object) ...{ return this.getCommandName(); }

如果没有设置commandName属性，默认值为“command”,通过setCommandName方法就可以自由的去决定comamnd对象的名称了。