SpringBoot中请求参数 @MatrixVariable 矩阵变量

一、矩阵变量请求格式

　　

/users;id=1,uname=jack

二、SpringBoot开启矩阵请求

1. 首先查看springboot源码关于矩阵部分的内容
   1. 　　在 WebMvcAutoConfiguration配置类中。

   2. @Override
              public void configurePathMatch(PathMatchConfigurer configurer) {
                  if (this.mvcProperties.getPathmatch()
                          .getMatchingStrategy() == WebMvcProperties.MatchingStrategy.PATH_PATTERN_PARSER) {
                      configurer.setPatternParser(pathPatternParser);
                  }
                  configurer.setUseSuffixPatternMatch(this.mvcProperties.getPathmatch().isUseSuffixPattern());
                  configurer.setUseRegisteredSuffixPatternMatch(
                          this.mvcProperties.getPathmatch().isUseRegisteredSuffixPattern());
                  this.dispatcherServletPath.ifAvailable((dispatcherPath) -> {
                      String servletUrlMapping = dispatcherPath.getServletUrlMapping();
                      if (servletUrlMapping.equals("/") && singleDispatcherServlet()) {
                          UrlPathHelper urlPathHelper = new UrlPathHelper();
                          urlPathHelper.setAlwaysUseFullPath(true);
                          configurer.setUrlPathHelper(urlPathHelper);
                      }
                  });
              }

   3. 在此方法中的 UrlPathHelper，中对矩阵变量做了截取，代码如下：
      1. 　　往上查看变量removeSemicolonContent，默认定义为true

      2. /**
          * Set if ";" (semicolon) content should be stripped from the request URI.
          * <p>Default is "true".
          */
         public void setRemoveSemicolonContent(boolean removeSemicolonContent) {
            checkReadOnly();
            this.removeSemicolonContent = removeSemicolonContent;
         }
         

2. 开启矩阵变量
   1. 第一种方式。创建配置类，实现WebMvcConfigurer接口。重写 configurePathMatch() 方法

   @Override
       public void configurePathMatch(PathMatchConfigurer configurer) {
           UrlPathHelper urlPathHelper = new UrlPathHelper();
           // 将默认值改为false
           urlPathHelper.setRemoveSemicolonContent(false);
           configurer.setUrlPathHelper(urlPathHelper);
       }

   1. 第二种方式，在SpringBoot添加容器

   2. @Bean
      public WebMvcConfigurer webMvcConfigurer(){
         return new WebMvcConfigurer() {
             @Override
             public void configurePathMatch(PathMatchConfigurer configurer) {
                 UrlPathHelper urlPathHelper = new UrlPathHelper();
                 urlPathHelper.setRemoveSemicolonContent(false);
                 configurer.setUrlPathHelper(urlPathHelper);
             }
         };
      }