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")@Slf4jpublicclassDemoController{@GetMapping("/query")publicvoidgetStudent(String name,String age){
        log.info("name:{}",name);
        log.info("age:{}",age);}}

1. 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")@Slf4jpublicclassDemoController{@GetMapping("/query")publicvoidgetStudent(@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")@Slf4jpublicclassDemoController{@GetMapping("/query")publicvoidgetStudent(Student student){
        log.info("name:{}",student.getName());
        log.info("age:{}",student.getAge());}}@DataclassStudent{privateString name;privateInteger age;}

1.3 通过HttpServletRequest接收参数

@RestController@RequestMapping("/demo")@Slf4jpublicclassDemoController{@GetMapping("/query")publicvoidgetStudent(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")@Slf4jpublicclassDemoController{@GetMapping("/query/{name}/{age}")publicvoidgetStudent(@PathVariableString name,@PathVariableString age){
        log.info("name:{}",name);
        log.info("age:{}",age);}}

1.5 接收数组参数

@RestController@RequestMapping("/demo")@Slf4jpublicclassDemoController{@GetMapping("/query")publicvoidgetStudent(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")@Slf4jpublicclassDemoController{@GetMapping("/query")publicvoidgetStudent(@RequestParamList<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")@Slf4jpublicclassDemoController{@PostMapping("/save")publicvoidsaveStudent(String name,String age){
        log.info("name:{}",name);
        log.info("age:{}",age);}}

1. 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")@Slf4jpublicclassDemoController{@PostMapping("/save")publicvoidsaveStudent(@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")@Slf4jpublicclassDemoController{@PostMapping("/save")publicvoidsaveStudent(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")@Slf4jpublicclassDemoController{@PostMapping("/save/{name}/{age}")publicvoidsaveStudent(@PathVariableString name,@PathVariableString 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")@Slf4jpublicclassDemoController{@PostMapping("/save")publicvoidsaveStudent(Student student){
        log.info("name:{}",student.getName());
        log.info("age:{}",student.getAge());}}@DataclassStudent{privateString name;privateInteger 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")@Slf4jpublicclassDemoController{@PostMapping("/save")publicvoidsaveStudent(@RequestBodyStudent student){
        log.info("name:{}",student.getName());
        log.info("age:{}",student.getAge());}}@DataclassStudent{privateString name;privateInteger age;}

1. 接收数组或者集合类JSON参数

@RestController@RequestMapping("/demo")@Slf4jpublicclassDemoController{@PostMapping("/save")publicvoidsaveStudent(@RequestBodyString[] names){Arrays.stream(names).forEach(System.out::println);}@PostMapping("/save")publicvoidsaveStudent(@RequestBodyList<String> names){
        names.forEach(System.out::println);}}

2.6 通过 Map 接收参数

@RestController@RequestMapping("/demo")@Slf4jpublicclassDemoController{@PostMapping("/save")publicvoidsaveStudent(@RequestParamMap<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")@Slf4jpublicclassDemoController{@PostMapping("/save")publicvoidsaveStudent(@RequestBodyString name){
        log.info("name:{}",name);}}