Spring Boot 学习（一）@RequestAttribute @MatrixVariable @UrlPathHelper

@GetMapping("/send")
    @H_616_3@public@H_616_3@ String getmessage(httpServletrequest request) {
        request.setAttribute(@H_616_3@"msg","跳转");     //@H_616_3@设置参数@H_616_3@
        request.setAttribute("code",123);

        @H_616_3@return@H_616_3@ "forWARD:/success";  //@H_616_3@转发到success请求@H_616_3@
    }

　　 @ResponseBody    //@H_616_3@注意要加上这个注解，否则会出现500报错@H_616_3@
    @GetMapping("/success")
    @H_616_3@public@H_616_3@ Map success(@requestAttribute("msg") String msg,     //@H_616_3@通过requestAttribute获取请求域中的所有值@H_616_3@
                       @requestAttribute("code") Integer code,
                        httpServletrequest request) {    @H_616_3@//@H_616_3@获取到send的数据msg@H_616_3@
        Object msg1 = request.getAttribute("msg");
        Map@H_616_3@<String,Object> map = new@H_616_3@ HashMap<>();
        map.put(@H_616_3@"reqMethod_msg",msg1);  //@H_616_3@获取原生servlet中的request的值@H_616_3@
        map.put("Annotation_msg",msg);  //@H_616_3@获取基于注解额request的值@H_616_3@
        return@H_616_3@ map;
    }@H_616_3@

package@H_616_3@ com.sp.Controller;
@H_616_3@import@H_616_3@ org.springframework.stereotype.Controller;
@H_616_3@import@H_616_3@ org.springframework.web.bind.Annotation.GetMapping;
@H_616_3@import@H_616_3@ org.springframework.web.bind.Annotation.requestAttribute;
@H_616_3@import@H_616_3@ org.springframework.web.bind.Annotation.ResponseBody;
@H_616_3@import@H_616_3@ javax.servlet.http.httpServletrequest;
@H_616_3@import@H_616_3@ java.util.HashMap;
@H_616_3@import@H_616_3@ java.util.Map;

@Controller   //这里只声明了Controller注解
@H_616_3@@H_616_3@public@H_616_3@ class@H_616_3@ requestController {

    @GetMapping(@H_616_3@"/send")
    @H_616_3@public@H_616_3@ String getmessage(httpServletrequest request) {
        request.setAttribute(@H_616_3@"msg","跳转");
        request.setAttribute(@H_616_3@"code",123);

        @H_616_3@return@H_616_3@ "forWARD:/success";  //@H_616_3@转发到success请求@H_616_3@
    }
    @ResponseBody     //因此在显示页面数据需要加上注解ResponseBody@H_616_3@
    @GetMapping(@H_616_3@"/success")
    @H_616_3@public@H_616_3@ Map success(@requestAttribute("msg") String msg,     //@H_616_3@通过requestAttribute获取请求域中的所有值@H_616_3@
                       @requestAttribute("code") Integer code,
                        httpServletrequest request) {    @H_616_3@//@H_616_3@获取到send的数据msg@H_616_3@
        Object msg1 = request.getAttribute("msg");
        Map@H_616_3@<String,Object> map = new@H_616_3@ HashMap<>();
        map.put(@H_616_3@"reqMethod_msg",msg1);  //@H_616_3@获取原生servlet中的request的值@H_616_3@
        map.put("Annotation_msg",msg);  //@H_616_3@获取基于注解额request的值@H_616_3@
        return@H_616_3@ map;
    }
}@H_616_3@

package@H_616_3@ com.sp.config;

@H_616_3@import@H_616_3@ org.springframework.context.Annotation.bean;
@H_616_3@import@H_616_3@ org.springframework.context.Annotation.Configuration;
@H_616_3@import@H_616_3@ org.springframework.web.servlet.config.Annotation.PathMatchConfigurer;
@H_616_3@import@H_616_3@ org.springframework.web.servlet.config.Annotation.WebMvcConfigurer;
@H_616_3@import@H_616_3@ org.springframework.web.util.UrlPathHelper;

@Configuration(proxyBeanMethods @H_616_3@= false@H_616_3@)
@H_616_3@public@H_616_3@ class@H_616_3@ WebConfig /*@H_616_3@implements WebMvcConfigurer @H_616_3@*/@H_616_3@{
@H_616_3@//@H_616_3@      写法一
@H_616_3@//@H_616_3@    @Override
@H_616_3@//@H_616_3@    public void configurePathMatch(PathMatchConfigurer configurer) {  @H_616_3@//@H_616_3@对configurePathMatch进行重写
@H_616_3@//@H_616_3@        UrlPathHelper urlPathHelper = new UrlPathHelper();
@H_616_3@//@H_616_3@        urlPathHelper.setRemoveSemicolonContent(false);  @H_616_3@//@H_616_3@将RemoveSemicolonContent设置为false,此时矩阵变量才能生效
@H_616_3@//@H_616_3@        configurer.setUrlPathHelper(urlPathHelper);
@H_616_3@//@H_616_3@    }
@H_616_3@//@H_616_3@    写法二@H_616_3@
      @Bean   //自己定义一个组件
    @H_616_3@public@H_616_3@ WebMvcConfigurer webMvcConfigurer() {
          @H_616_3@return@H_616_3@ new@H_616_3@ WebMvcConfigurer() {
              @H_616_3@public@H_616_3@ void@H_616_3@ configurePathMatch(PathMatchConfigurer configurer) {
                  UrlPathHelper urlPathHelper @H_616_3@= new@H_616_3@ UrlPathHelper();
                  urlPathHelper.setRemoveSemicolonContent(@H_616_3@false@H_616_3@);
                configurer.setUrlPathHelper(urlPathHelper);
              }
          };
      }

}
@H_616_3@

@H_616_3@

在UrlPathHelper中默认情况下是移除分号内容

@GetMapping("/cars/{path}")           @H_616_3@//矩阵变量必须有url路径变量才能被解析,否则404

public@H_616_3@ Map carsell(@matrixVariable("low") Integer low, //@H_616_3@不是请求参数，而是矩阵变量，需要加上注解,矩阵变量要绑定在路径变量中@H_616_3@ @matrixVariable("brand") List<String> brand, @PathVariable(@H_616_3@"path") String path) { //@H_616_3@需要加上路径访问变量的注解@H_616_3@ Map<String,Object> map = new@H_616_3@ HashMap<>(); map.put(@H_616_3@"low",low); map.put(@H_616_3@"brand",brand); map.put(@H_616_3@"path",path); @H_616_3@return@H_616_3@ map; }@H_616_3@

<@H_616_3@a @H_616_3@href@H_616_3@="/cars/sell;low=34;brand=byd,audi,yd"@H_616_3@>@H_616_3@matrixVariable(矩阵变量)</@H_616_3@a@H_616_3@>@H_616_3@

@GetMapping("/boss/{BossID}/{empID}")
    @H_616_3@public@H_616_3@ Map bossmessage(@matrixVariable(value = "age",pathVar = "bossId") Integer bossage,  //@H_616_3@当传入的参数名一样时,需要哟波pathVar进行区分@H_616_3@
                           @matrixVariable(value = "age",pathVar = "empId") Integer empagE) {
        Map@H_616_3@<String,Object> map = new@H_616_3@ HashMap<>();
        map.put(@H_616_3@"bossage",bossagE);
        map.put(@H_616_3@"empage",empagE);
        @H_616_3@return@H_616_3@ map;
    }@H_616_3@

<@H_616_3@a @H_616_3@href@H_616_3@="/boss/1;age=34/2;age=22"@H_616_3@>@H_616_3@matrixVariable(矩阵变量2)</@H_616_3@a@H_616_3@>@H_616_3@