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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";}
}

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;}
}

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;}
}

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;}
}

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;}
}

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;}

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;}
}

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;}

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 {@Overridepublic 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);}
}

创建返回WebMvcConfigurerBean：

@Configuration(proxyBeanMethods = false)
public class WebConfig{@Beanpublic WebMvcConfigurer webMvcConfigurer(){return new WebMvcConfigurer() {@Overridepublic 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);}}}
}

@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;}