freemarker视图模板使用

一、配置

• 整合springmvc

• pom.xml

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.6.RELEASE</version>
        </dependency>
        <!--freemarker依赖-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>5.2.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.30</version>
        </dependency>

• spring-mvc.xml

<bean id="freemarkerConfig"
          class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
        <property name="templateLoaderPaths" value="/template/"/>
        <property name="defaultEncoding" value="utf-8"/>
        <property name="freemarkerSettings">
            <props>
                <prop key="template_update_delay">0</prop>
                <prop key="locale">zh_CN</prop>
                <prop key="datetime_format">yyyy-MM-dd</prop>
                <prop key="number_format">#.##</prop>
                <prop key="whitespace_stripping">true</prop>
                <prop key="default_encoding">UTF-8</prop>
            </props>
        </property>
    </bean>
    <bean id="viewResolver" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
        <property name="cache" value="true"/>
        <!--<property name="prefix" value="/template/" />-->
        <property name="suffix" value=".ftl"/>
        <property name="contentType" value="text/html;charset=UTF-8"></property>
        <property name="requestContextAttribute" value="request"/>
        <property name="exposeSpringMacroHelpers" value="true"/>
        <property name="exposeRequestAttributes" value="true"/>
        <property name="exposeSessionAttributes" value="true"/>
    </bean>

• 在templateLoaderPaths路径下创建ftl文件，写法和html一致
• 访问controller，返回freemarker视图模板

或者通过注解来配置(非规范示例：)

@Configuration
@EnableWebMvc
@ComponentScan("com.lwr.controller")
public class ConfigMVC extends WebMvcConfigurerAdapter {

    /*
    * other config
    * */


    @Bean
    public FreeMarkerConfig getFreeMarkerConfig() {
        Properties properties = new Properties();
        properties.setProperty("datetime_format", "dd.MM.yyyy");
        properties.setProperty("number_format", "#");
        properties.setProperty("whitespace_stripping", "true");
//        properties.setProperty("auto_include", "lib/implicit.ftl");
        properties.setProperty("default_encoding", "UTF-8");

        FreeMarkerConfigurer freeMarkerConfigurer = new FreeMarkerConfigurer();
        freeMarkerConfigurer.setFreemarkerSettings(properties);
        freeMarkerConfigurer.setTemplateLoaderPath("/template/");

        return freeMarkerConfigurer;
    }

    @Bean
    public ViewResolver getViewResolver() {
        FreeMarkerViewResolver viewResolver = new FreeMarkerViewResolver();
        viewResolver.setCache(true);
        viewResolver.setPrefix("");
        viewResolver.setSuffix(".ftl");
        viewResolver.setExposeSpringMacroHelpers(true);
        viewResolver.setContentType("text/html;charset=UTF-8");
        viewResolver.setOrder(1);
        return viewResolver;
    }
}

public class WebAppInitiliazer implements WebApplicationInitializer {

	public void onStartup(ServletContext servletContext) {
		//添加applicationContext
		AnnotationConfigWebApplicationContext root = new AnnotationConfigWebApplicationContext();
		root.scan("com.lwr.service");
		servletContext.addListener(new ContextLoaderListener(root));
		root.register(ConfigMVC.class);


		ServletRegistration.Dynamic appServlet = servletContext.addServlet(
				"appServlet", new DispatcherServlet(root));
		appServlet.setLoadOnStartup(1);
		Set<String> mappingConflicts = appServlet.addMapping("/");
		if (!mappingConflicts.isEmpty()) {
			throw new IllegalStateException(
					"'appServlet' could not be mapped to '/' due to an existing mapping. This is a known issue under Tomcat versions <= 7.0.14; see <a href=\"https://issues.apache.org/bugzilla/show_bug.cgi?id=51278\">https://issues.apache.org/bugzilla/show_bug.cgi?id=51278</a>");
		}

	}
}