springboot整合freemarker以及auto_import、auto_include配置使用

1.application.properties配置：

# FREEMARKER (FreeMarkerAutoConfiguration) 
spring.freemarker.allow-request-override=false
spring.freemarker.allow-session-override=false
spring.freemarker.cache=false
spring.freemarker.charset=UTF-8
spring.freemarker.check-template-location=true
spring.freemarker.content-type=text/html
spring.freemarker.enabled=true
spring.freemarker.expose-request-attributes=true
spring.freemarker.expose-session-attributes=true
spring.freemarker.expose-spring-macro-helpers=true
spring.freemarker.prefer-file-system-access=true
spring.freemarker.suffix=.html
spring.freemarker.template-loader-path=classpath:/templates/
spring.freemarker.settings.template_update_delay=0
spring.freemarker.settings.default_encoding=UTF-8
spring.freemarker.settings.classic_compatible=true
spring.freemarker.settings.date_format=yyyy-MM-dd
spring.freemarker.settings.time_format=HH:mm:ss
spring.freemarker.settings.datetime_format=yyyy-MM-dd HH:mm:ss
spring.freemarker.request-context-attribute=request
spring.freemarker.order=1
auto_import=ftl/spring.ftl as s
auto_include=

2.spring.ftl存放位置：

templates/ftl/spring.ftl
内容：<#assign base = request.contextPath />

3.freemarkerconfig配置：

@org.springframework.context.annotation.Configuration
public class FreemarkerConfig {
	
	private static Logger log = LoggerFactory.getLogger(FreemarkerConfig.class);
    
	@Bean
    public FreeMarkerConfigurer freeMarkerConfigurer(@Value("${auto_import}") String autoImport,@Value("${auto_include}") String autoInclude) throws Exception {
        FreeMarkerConfigurer config = new FreeMarkerConfigurer();
        writerProperties(config);
        Configuration configuration = null;
        try {
            configuration = config.createConfiguration();
        } catch (IOException e) {
            throw new ConfigException("freemarker配置bean，IO异常",e);
        } catch (TemplateException e) {
            throw new ConfigException("freemarker配置bean异常",e);
        }
        setAutoImport(autoImport,configuration);
        setAutoInclude(autoInclude,configuration);
        config.setConfiguration(configuration);
        return config;
    }
    @Autowired
    private FreeMarkerProperties properties;

    private void writerProperties(FreeMarkerConfigurer config) {
        config.setTemplateLoaderPaths(this.properties.getTemplateLoaderPath());
        config.setPreferFileSystemAccess(this.properties.isPreferFileSystemAccess());
        config.setDefaultEncoding(this.properties.getCharsetName());
        Properties settings = new Properties();
        settings.putAll(this.properties.getSettings());
        config.setFreemarkerSettings(settings);
    }
    
    private void setAutoImport(String autoImport,Configuration configuration) throws Exception {
        if("_".equals(autoImport.trim())) {
            return;
        }
        String[] imports = autoImport.split(";");
        Map importMap = new HashMap(imports.length);
        for (String s : imports) {
            String[] keyValue = s.split("as");
            if (keyValue.length != 2) {
                log.error("freemarker配置auto_import格式不正确 ");
                throw new ConfigException("freemarker配置auto_import格式不正确");
            }
            importMap.put(keyValue[1].trim(),keyValue[0].trim());
        }
        configuration.setAutoImports(importMap);
    }
    
    private void setAutoInclude(final String autoInclude,Configuration configuration) {
        if ("_".equals(autoInclude.trim())) {
            return;
        }
        String[] includes = autoInclude.split(";");
        for (String s : includes) {
            System.out.println(s);
        }
        List list = new ArrayList(Arrays.asList(includes));
        configuration.setAutoIncludes(list);
    }
}

4.页面引用：

${s.base}或者使用${request.contextPath}