SpringBoot请求处理-常用参数使用 @RequestAttribute、@RequestParam、@RequestHeader 、@PathVariable、@MatrixVariable_springboot3 requestattributes

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一.常用参数注解使用

@RestController
public class HelloController {

    @RequestMapping("/a.jpg")
    public String hello(@RequestParam("username") String name){//请求参数username给name
//        HttpSession session操作session
//        Model model  放request域
//        Person person 自定义类型请求对象        
        return "aaaaaa";
    }
}
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1. @PathVariable 路径变量

@PathVariable 路径变量

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;
@RestController
public class ParameterTestController {
    @GetMapping("/car/{id}/owner/{username}")
    public Map<String,Object> getCar(@PathVariable("id") Integer id,
                                     @PathVariable("username") String name,
                                     @PathVariable Map<String,String> pv
    ){
        Map<String,Object> map=new HashMap<>();
        map.put("id",id);
        map.put("name",name);
        map.put("pv",pv);
        return map;
    }
}
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2.@RequestHeader 获取请求头

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;
@RestController
public class ParameterTestController {
    @GetMapping("/car/{id}/owner/{username}")
    public Map<String,Object> getCar(@PathVariable("id") Integer id,
                                     @PathVariable("username") String name,
                                     @PathVariable Map<String,String> pv,
                                     @RequestHeader("user-Agent") String userAgent,
                                     @RequestHeader Map<String,String> header
    ){
        Map<String,Object> map=new HashMap<>();
        map.put("id",id);
        map.put("name",name);
        map.put("pv",pv);
        map.put("user-Agent",userAgent);
        map.put("headers",header);
        return map;
    }
}
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3.@RequestParam 获取请求参数

（指问号后的参数，url?a=1&b=2）

@RestController
public class ParameterTestController {
    @GetMapping("/car/{id}/owner/{username}")
    public Map<String,Object> getCar(@PathVariable("id") Integer id,
                                     @PathVariable("username") String name,
                                     @PathVariable Map<String,String> pv,
                                     @RequestHeader("user-Agent") String userAgent,
                                     @RequestHeader Map<String,String> header,
                                     @RequestParam("age") Integer age,
                                     @RequestParam("interes") List<String> interes,
                                     @RequestParam Map<String,String> params
    ){
        Map<String,Object> map=new HashMap<>();
//        map.put("id",id);
//        map.put("name",name);
//        map.put("pv",pv);
//        map.put("user-Agent",userAgent);
//        map.put("headers",header);
        map.put("age",age);
        map.put("interes",interes);
        map.put("params",params);
        return map;
    }
}

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4.@CookieValue 获取Cookie值

@RestController
public class ParameterTestController {
    @GetMapping("/car/{id}/owner/{username}")
    public Map<String,Object> getCar(@PathVariable("id") Integer id,
                                     @PathVariable("username") String name,
                                     @PathVariable Map<String,String> pv,
                                     @RequestHeader("user-Agent") String userAgent,
                                     @RequestHeader Map<String,String> header,
                                     @RequestParam("age") Integer age,
                                     @RequestParam("interes") List<String> interes,
                                     @RequestParam Map<String,String> params,
                                     @CookieValue("_ga")  String _ga,
                                     @CookieValue("_ga") Cookie cookie
    ){
        Map<String,Object> map=new HashMap<>();
//        map.put("id",id);
//        map.put("name",name);
//        map.put("pv",pv);
//        map.put("user-Agent",userAgent);
//        map.put("headers",header);
        map.put("age",age);
        map.put("interes",interes);
        map.put("params",params);
        map.put("_ga",_ga);
        System.out.println(cookie.getName()+"===>"+cookie.getValue());
        return map;
    }
}
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5.@RequestBody 获取请求体[POST]

    @PostMapping("/save")
    public Map postMethod(@RequestBody String content){
        Map<String,Object> map = new HashMap<>();
        map.put("content",content);
        return map;
    }
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6.请求处理-@RequestAttribute

获取request域属性

@Controller
public class RequestController {

    @GetMapping("/goto")
    public String goToPage(HttpServletRequest request){

        request.setAttribute("msg","成功了...");
        request.setAttribute("code",200);
        return "forward:/success";  //转发到  /success请求
    }
    
    @ResponseBody
    @GetMapping("/success")
    public Map success(@RequestAttribute(value = "msg",required = false) String msg,
                       @RequestAttribute(value = "code",required = false)Integer code,
                       HttpServletRequest request){
        Object msg1 = request.getAttribute("msg");
        Map<String,Object> map = new HashMap<>();
        map.put("reqMethod_msg",msg1);
        map.put("annotation_msg",msg);
        return map;
    }
}

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7.@MatrixVariable与UrlPathHelper

/cars/sell;low=34;brand=byd,audi,yd 矩阵变量
例：cars/sell;low=33;brand=byd,bb.ik
url重写：/abc;jsessionid=xxxx 把cookie的值使用矩阵变量的方式进行传递

    @GetMapping("/cars/{path}")
    public Map carsSell(@MatrixVariable("low") Integer low,
                        @MatrixVariable("brand") List<String> brand,
                        @PathVariable("path") String path){
        Map<String,Object> map = new HashMap<>();

        map.put("low",low);
        map.put("brand",brand);
        map.put("path",path);
        return map;
    }
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SpringBoot默认禁用矩阵变量
手动开启：对于路径的处理使用UrlPathHelper进行解析
removeSemicolonContent(移除分号内容)支持矩阵变量的

实现WebMvcConfigurer接口：

@Configuration(proxyBeanMethods = false)
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) {

        UrlPathHelper urlPathHelper = new UrlPathHelper();
        // 不移除；后面的内容。矩阵变量功能就可以生效
        urlPathHelper.setRemoveSemicolonContent(false);
        configurer.setUrlPathHelper(urlPathHelper);
    }
}

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创建返回WebMvcConfigurerBean：

@Configuration(proxyBeanMethods = false)
public class WebConfig{
    @Bean
    public WebMvcConfigurer webMvcConfigurer(){
        return new WebMvcConfigurer() {
                        @Override
            public void configurePathMatch(PathMatchConfigurer configurer) {
                UrlPathHelper urlPathHelper = new UrlPathHelper();
                // 不移除；后面的内容。矩阵变量功能就可以生效
                urlPathHelper.setRemoveSemicolonContent(false);
                configurer.setUrlPathHelper(urlPathHelper);
            }
        }
    }
}
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@MatrixVariable的用例

    // /boss/1;age=20/2;age=10

    @GetMapping("/boss/{bossId}/{empId}")
    public Map boss(@MatrixVariable(value = "age",pathVar = "bossId") Integer bossAge,
                    @MatrixVariable(value = "age",pathVar = "empId") Integer empAge){
        Map<String,Object> map = new HashMap<>();

        map.put("bossAge",bossAge);
        map.put("empAge",empAge);
        return map;

    }
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