SpringBoot中Get请求和POST请求接收参数详解

1、Get请求

1.1 方法形参接收参数

1. 这种方式一般适用参数比较少的情况，并且前后端参数名称必须保持一致

   @RestController

   @RequestMapping("/user")

   @Slf4j

   public class DemoController {

   @GetMapping("/query")
   public void getStudent(String name,String age) {
       log.info("name:{}",name);
       log.info("age:{}",age);
   }

   }

2. 参数用 @RequestParam 标注，使用value属性指定参数名，required属性表示这个参数是否必传

   @RestController

   @RequestMapping("/user")

   @Slf4j

   public class DemoController {

   @GetMapping("/query")
   public void getStudent(@RequestParam(value = "name", required = false) String name,
                          @RequestParam(value = "age", required = false) String age) {
       log.info("name:{}",name);
       log.info("age:{}",age);
   }

   }

1.2 实体类接收参数

注意：Get 请求以实体类接收参数时，不能用 RequestParam 注解进行标注，因为不支持这样的方式获取参数。

@RestController
@RequestMapping("/demo")
@Slf4j
public class DemoController {

    @GetMapping("/query")
    public void getStudent(Student student) {
        log.info("name:{}",student.getName());
        log.info("age:{}",student.getAge());
    }
}

@Data
class Student{
    private String name;
    private Integer age;
}

1.3 通过HttpServletRequest接收参数

@RestController
@RequestMapping("/demo")
@Slf4j
public class DemoController {

    @GetMapping("/query")
    public void getStudent(HttpServletRequest request) {
        String name = request.getParameter("name");
        String phone = request.getParameter("age");
        log.info("name:{}",name);
        log.info("age:{}",age);
    }
}

1.4 通过@PathVariable接收参数

@RestController
@RequestMapping("/demo")
@Slf4j
public class DemoController {

    @GetMapping("/query/{name}/{age}")
    public void getStudent(@PathVariable String name, @PathVariable String age) {
        log.info("name:{}",name);
        log.info("age:{}",age);
    }
}

1.5 接收数组参数

@RestController
@RequestMapping("/demo")
@Slf4j
public class DemoController {

    @GetMapping("/query")
    public void getStudent(String[] names) {
        Arrays.stream(names).forEach(System.out::println);
    }
}

1.6 接受集合参数

注意：SpringBoot 接收集合参数，必须用 @RequestParam 注解声明！

@RestController
@RequestMapping("/demo")
@Slf4j
public class DemoController {

    @GetMapping("/query")
    public void getStudent(@RequestParam List<String> names) {
        names.forEach(System.out::println);
    }
}

2、POST请求

2.1 方法形参接收参数

1. 前后端参数名称必须保持一致

   @RestController

   @RequestMapping("/user")

   @Slf4j

   public class DemoController {

   @PostMapping("/save")
   public void saveStudent(String name,String age) {
       log.info("name:{}",name);
       log.info("age:{}",age);
   }

   }

2. 参数用 @RequestParam 标注，使用value属性指定参数名，required属性表示这个参数是否必传

   @RestController

   @RequestMapping("/user")

   @Slf4j

   public class DemoController {

   @PostMapping("/save")
   public void saveStudent(@RequestParam(value = "name", required = false) String name,
                          @RequestParam(value = "age", required = false) String age) {
       log.info("name:{}",name);
       log.info("age:{}",age);
   }

   }

2.2 通过HttpServletRequest接收参数

@RestController
@RequestMapping("/demo")
@Slf4j
public class DemoController {

    @PostMapping("/save")
    public void saveStudent(HttpServletRequest request) {
        String name = request.getParameter("name");
        String phone = request.getParameter("age");
        log.info("name:{}",name);
        log.info("age:{}",age);
    }
}

2.3 通过@PathVariable接收参数

@RestController
@RequestMapping("/demo")
@Slf4j
public class DemoController {

    @PostMapping("/save/{name}/{age}")
    public void saveStudent(@PathVariable String name, @PathVariable String age) {
        log.info("name:{}",name);
        log.info("age:{}",age);
    }
}

2.4 通过param方式提交参数，以实体类接收参数

直接以实体类可以接收param、form-data、 x-www-form-urlencoded 提交的参数

@RestController
@RequestMapping("/demo")
@Slf4j
public class DemoController {

    @PostMapping("/save")
    public void saveStudent(Student student) {
        log.info("name:{}",student.getName());
        log.info("age:{}",student.getAge());
    }
}

@Data
class Student{
    private String name;
    private Integer age;
}

2.5 请求体以JSON格式提交参数，通过 @RequestBody 注解接收参数

1. 接受实体类JSON参数

   @RestController

   @RequestMapping("/demo")

   @Slf4j

   public class DemoController {

   @PostMapping("/save")
   public void saveStudent(@RequestBody Student student) {
       log.info("name:{}",student.getName());
       log.info("age:{}",student.getAge());
   }

   }

   @Data

   class Student{

   private String name;

   private Integer age;

   }

2. 接收数组或者集合类JSON参数

   @RestController

   @RequestMapping("/demo")

   @Slf4j

   public class DemoController {

   @PostMapping("/save")
   public void saveStudent(@RequestBody String[] names) {
       Arrays.stream(names).forEach(System.out::println);
   }
   
   @PostMapping("/save")
   public void saveStudent(@RequestBody List<String> names) {
       names.forEach(System.out::println);
   }

   }

2.6 通过 Map 接收参数

@RestController
@RequestMapping("/demo")
@Slf4j
public class DemoController {

    @PostMapping("/save")
    public void saveStudent(@RequestParam Map<String,Object> map) {
        log.info("name:{}",map.get("name"));
        log.info("age:{}",map.get("age"));
    }
}

2.7 通过@RequestBody 接收一个参数

@RestController
@RequestMapping("/demo")
@Slf4j
public class DemoController {

    @PostMapping("/save")
    public void saveStudent(@RequestBody String name) {
        log.info("name:{}",name);
    }
}