SpringBoot Controller接收参数的几种常用方式

小鱼儿 2021-09-18 04:18 354阅读 0赞

# 第一类：请求路径参数 #

**1. @PathVariable**

获取路径参数。即url/\{id\}这种形式。

**2. @RequestParam**

获取查询参数。即url?name=这种形式

**例子**

GET  
http://localhost:8080/demo/123?name=suki\_rong  
对应的java代码

@GetMapping("/demo/{id}")
    public void demo(@PathVariable(name = "id") String id, @RequestParam(name = "name") String name) { 
        System.out.println("id=" id);
        System.out.println("name=" name);
    }

# 第二类：Body参数 #

因为是POST请求，这里用Postman的截图结合代码说明  
**1. @RequestBody**  
**例子**  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3OTY4OTgy_size_16_color_FFFFFF_t_70][]

对应的java代码：

@PostMapping(path = "/demo1")
    public void demo1(@RequestBody Person person) { 
        System.out.println(person.toString());
    }

输出结果：  
name:suki\_rong;age=18;hobby:programing

也可以是这样:

@PostMapping(path = "/demo1")
    public void demo1(@RequestBody Map<String, String> person) { 
        System.out.println(person.get("name"));
    }

输出结果：  
suki\_rong  
\*\*2.无注解 \*\*  
**例子**  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3OTY4OTgy_size_16_color_FFFFFF_t_70 1][]

对应的java代码：

@PostMapping(path = "/demo2")
    public void demo2(Person person) { 
        System.out.println(person.toString());
    }

输出结果：  
name:suki\_rong;age=18;hobby:programing  
**Person类**

public class Person { 
    
        private long id;
        private String name;
        private int age;
        private String hobby;
    
        @Override
        public String toString(){ 
            return "name:" name ";age=" age ";hobby:" hobby;
        }
    
        // getters and setters
    }

# 第三类：请求头参数以及Cookie #

**1. @RequestHeader**  
**2. @CookieValue**

**例子**

java代码：

@GetMapping("/demo3")
    public void demo3(@RequestHeader(name = "myHeader") String myHeader,
            @CookieValue(name = "myCookie") String myCookie) { 
        System.out.println("myHeader="   myHeader);
        System.out.println("myCookie="   myCookie);
    }

也可以这样

@GetMapping("/demo3")
    public void demo3(HttpServletRequest request) { 
        System.out.println(request.getHeader("myHeader"));
        for (Cookie cookie : request.getCookies()) { 
            if ("myCookie".equals(cookie.getName())) { 
                System.out.println(cookie.getValue());
            }
        }
    }

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