spring boot 配置freemarker及使用freemarker渲染页面

1.springboot 中自带的页面渲染工具为thymeleaf 还有freemarker 这两种模板引擎 简单比较下两者不同，

1.1freemaker 优点

freemarker 不足：thymeleaf由于使用了标签属性做为语法，模版页面直接用浏览器渲染，使得前端和后端可以并行开发。freemarket使用</>这样的语法，就无法直接使浏览器渲染出原本页面的样子。

thymeleaf优点：

1. 静态html嵌入标签属性，浏览器可以直接打开模板文件，便于前后端联调。
2. springboot官方推荐方案。

thymeleaf缺点：

1. 模板必须符合xml规范

比较下两者

1.从写code的习惯角度可能freemarker更习惯于我们的思维。
2.不过从前后分离开发的角度看thymeleaf更合适，值的绑定都是基于html的dom元素属性的，适合前后联调。

还是回归下主题

开始编码：

1.引入pom依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>

2.向yml格式配置文件添加内容

spring:
  freemarker:
    request-context-attribute: req  #req访问request
    suffix: .html  #后缀名
    content-type: text/html
    enabled: true
    cache: false #缓存配置
    template-loader-path: classpath:/templates/ #模板加载路径 按需配置
    charset: UTF-8 #编码格式
    settings:
      number_format: '0.##'   #数字格式化，无小数点

3.测试接口如图

4.index文件位置如图

index 内容

5.启动项目如图

index页面渲染成功

网上收集 propertity的freemarker 配置 （propertity格式配置文件）

 # 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.

另外需要使用thymeleaf 可以使用如下配置（yml 格式配置文件方式）

##视图模型
spring:
  thymeleaf:
    prefix: classpath:/templates/
    suffix: .html
    cache: false
    encoding: utf-8
    content-type: text/html
    check-template-location: true