版权声明：本文有博主原创，转载请注明出处 https://blog.csdn.net/jinghuayuanli/article/details/78130633
spring boot中使用freemarker模板引擎技术，spring boot中提供了一些默认的配置。默认配置如下所示：
本文只探讨freemarker中模板路径的设置方式，其他配置，请注意查看后续文章。
# FREEMARKER (FreeMarkerAutoConfiguration)
spring.freemarker.allow-request-override=false # Set whether HttpServletRequest attributes are allowed to override (hide) controller generated model attributes of the same name.
spring.freemarker.allow-session-override=false # Set whether HttpSession attributes are allowed to override (hide) controller generated model attributes of the same name.
spring.freemarker.cache=false # Enable template caching.
spring.freemarker.charset=UTF-8 # Template encoding.
spring.freemarker.check-template-location=true # Check that the templates location exists.
spring.freemarker.content-type=text/html # Content-Type value.
spring.freemarker.enabled=true # Enable MVC view resolution for this technology.
spring.freemarker.expose-request-attributes=false # Set whether all request attributes should be added to the model prior to merging with the template.
spring.freemarker.expose-session-attributes=false # Set whether all HttpSession attributes should be added to the model prior to merging with the template.
spring.freemarker.expose-spring-macro-helpers=true # Set whether to expose a RequestContext for use by Spring's macro library, under the name "springMacroRequestContext".
spring.freemarker.prefer-file-system-access=true # Prefer file system access for template loading. File system access enables hot detection of template changes.
spring.freemarker.prefix= # Prefix that gets prepended to view names when building a URL.
spring.freemarker.request-context-attribute= # Name of the RequestContext attribute for all views.
spring.freemarker.settings.*= # Well-known FreeMarker keys which will be passed to FreeMarker's Configuration.
spring.freemarker.suffix= # Suffix that gets appended to view names when building a URL.
spring.freemarker.template-loader-path=classpath:/templates/ # Comma-separated list of template paths.
spring.freemarker.view-names= # White list of view names that can be resolved.如上所示，您可以在spring boot的默认配置文件中设置模板路径（spring boot默认读取的配置文件为：application.properties，当然还有其他的读取方式，如果想了解这方面的文章，请查看后续文章）
spring.freemarker.template-loader-path=classpath:/templates/ # Comma-separated list of template paths.此种配置，只能读取classpath下的路径。如果想要读取其他路径则要重写freemarker的默认配置，在spring boot中，你可以这样做：
@Configuration
public class TemplateLoader extends WebMvcConfigurerAdapter {
@Bean
public ViewResolver viewResolver() {
FreeMarkerViewResolver resolver = new FreeMarkerViewResolver();
resolver.setCache(true);
resolver.setPrefix("");
resolver.setSuffix(".ftl");
resolver.setContentType("text/html; charset=UTF-8");
return resolver;
}
@Bean
public FreeMarkerConfigurer freemarkerConfig() throws IOException, TemplateException {
FreeMarkerConfigurer configurer = new FreeMarkerConfigurer();
configurer.setTemplateLoaderPaths("file:绝对路径","http://www.xxx.com/");
configurer.setDefaultEncoding("UTF-8");
return configurer;
}
}如代码所示，在此处，你可以设置多个freemarker路径，当然越靠前的路径权重越高，系统会在读取第一个失败的情况下，会继续读取第二个路径。
在此处，你可以有三种方式读取模板路径
第一种：classpath:/static/
第二种：file:绝对路径
第三种：http://www.xxx.com
其中第一种和第二种是统一类型，但是，第一种只能读取系统配置文件路径，第二种只能读取绝对路径。第三种则可以读取ftp文件
关于setTemplateLoaderPaths的方法，在源码中的解释，我们可以看一下：
/**
* Set multiple Freemarker template loader paths via Spring resource locations.
* <p>When populated via a String, standard URLs like "file:" and "classpath:"
* pseudo URLs are supported, as understood by ResourceEditor. Allows for
* relative paths when running in an ApplicationContext.
* <p>Will define a path for the default FreeMarker template loader.
* If a specified resource cannot be resolved to a {@code java.io.File},
* a generic SpringTemplateLoader will be used, without modification detection.
* <p>To enforce the use of SpringTemplateLoader, i.e. to not resolve a path
* as file system resource in any case, turn off the "preferFileSystemAccess"
* flag. See the latter's javadoc for details.
* <p>If you wish to specify your own list of TemplateLoaders, do not set this
* property and instead use {@code setTemplateLoaders(List templateLoaders)}
* @see org.springframework.core.io.ResourceEditor
* @see org.springframework.context.ApplicationContext#getResource
* @see freemarker.template.Configuration#setDirectoryForTemplateLoading
* @see SpringTemplateLoader
*/
public void setTemplateLoaderPaths(String... templateLoaderPaths) {
this.templateLoaderPaths = templateLoaderPaths;
}本文为博主原创，欢迎转载，但转载请注明出处。