java - 如何在 Spring 3 中使用 Velocity Tools 获取 VelocityEngine

Question

如何在 Spring 3 中使用 Velocity Tools 获取 VelocityEngine？我需要 Controller 中的一个方法来处理模板 Velocity，但需要有可用于初始化 Spring 3 的 Velocity 工具。现在我就是这样做的。

Spring 配置:

<bean id="velocityConfig" class="org.springframework.web.servlet.view.velocity.VelocityConfigurer">
        <property name="resourceLoaderPath" value="/WEB-INF/velocity/"/>        
        <property name="velocityProperties">
            <props>
                <prop key="input.encoding">UTF-8</prop>
                <prop key="output.encoding">UTF-8</prop>                
            </props>
        </property>                 
    </bean>

 <bean id="viewResolver" class="org.springframework.web.servlet.view.velocity.VelocityViewResolver">
        <property name="cache" value="false"/>
        <property name="prefix" value=""/>
        <property name="suffix" value=".html"/>        
        <property name="contentType" value="text/html; charset=UTF-8"/>     
        <property name="toolboxConfigLocation" value="/WEB-INF/velocity/config/toolbox.xml"/>
        <property name="viewClass" value="my.tools.VelocityToolsView"/> 
    </bean>

在 Controller 类中:

@Autowired
private VelocityConfigurer configurer;

private VelocityEngine velocityEngine;


private ToolContext toolContext;

@PostConstruct
public void init() {                    

        velocityEngine = configurer.getVelocityEngine();

        ToolManager toolManager = new ToolManager();
        toolManager.configure("fuulPath/WEB-INF/velocity/config/toolbox.xml");
        toolContext = toolManager.createContext();



}

在方法中:

    VelocityContext velocityContext = new VelocityContext(map, toolContext);                
    StringWriter writer = new StringWriter();        
    velocityEngine.mergeTemplate("myTeplate.html", "UTF-8", velocityContext, writer);        
    String templateString = writer.toString();   

Answer 1

当你不使用 Spring 配置时，上述获取速度的方法很好。当你使用 Spring 时，你不需要这么复杂。

在 spring.xml 中定义这个 bean

<bean id="velocityEngine"
        class="org.springframework.ui.velocity.VelocityEngineFactoryBean">
    <property name="velocityProperties">
        <value>
            resource.loader=class
            class.resource.loader.class=org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader
        </value>
    </property>
</bean>

并在你的java类中 Autowiring 这个bean

@Component
public class Sample {

    private VelocityEngine velocityEngine;

    public VelocityEngine getVelocityEngine() {
        return velocityEngine;
    }

    @Autowired
    @Required
    public void setVelocityEngine(VelocityEngine velocityEngine) {
        this.velocityEngine = velocityEngine;
    }

    public String getSomething(Object variable) {
        Map model = new HashMap();
        model.put("variable",variable);

        return VelocityEngineUtils.mergeTemplateIntoString(velocityEngine, "/templates/sometemp.vm", model);
    }   
}