SpringBoot中的常用注解

我就是我 2022-09-12 13:51 246阅读 0赞

**目录**

@RequestMapping

@GetMapping

@Controller、@ResponseBody

@PathVariable

@RequestParam

--------------------

新建HelloController类

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_20_color_FFFFFF_t_70_g_se_x_16][]

# @RequestMapping #

1、

package com.example.demo.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class HelloController {
    
        @RequestMapping("/hello")
        public String hello(){
            return "Hello World";
        }
    }

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_18_color_FFFFFF_t_70_g_se_x_16][]

或者：

package com.example.demo.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @RequestMapping("/hello")
    public class HelloController {
    
        @RequestMapping
        public String hello(){
            return "Hello World";
        }
    }

或者：

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

或者：

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_20_color_FFFFFF_t_70_g_se_x_16 2][]

注意：

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_20_color_FFFFFF_t_70_g_se_x_16 3][]

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_19_color_FFFFFF_t_70_g_se_x_16][]

2、

package com.example.demo.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @RequestMapping("/hello")
    public class HelloController {
    
        @RequestMapping("/2")
        public String hello(){
            return "Hello World";
        }
    }

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_19_color_FFFFFF_t_70_g_se_x_16 1][]

3、

package com.example.demo.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @RequestMapping("/hello")
    public class HelloController {
    
        @RequestMapping(value = "/2")
        public String hello(){
            return "Hello World";
        }
    }

# ![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_17_color_FFFFFF_t_70_g_se_x_16][] #

4、

package com.example.demo.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @RequestMapping("/hello")
    public class HelloController {
    
        @RequestMapping(value = "/2",method = RequestMethod.GET)
        public String hello(){
            return "Hello World";
        }
    }

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_17_color_FFFFFF_t_70_g_se_x_16][]

# @GetMapping #

package com.example.demo.controller;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class HelloController {
    
        @GetMapping("/hello")
        public String hello(){
            return "Hello World";
        }
    }

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_17_color_FFFFFF_t_70_g_se_x_16 1][]

或者：

package com.example.demo.controller;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @RequestMapping("/hello")
    public class HelloController {
    
        @GetMapping
        public String hello(){
            return "Hello World";
        }
    }

# @Controller、@ResponseBody #

相当于@Controllr+@ResponseBody=@RestController

1、

package com.example.demo.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.*;
    
    @Controller
    @ResponseBody
    @RequestMapping("/hello")
    public class HelloController {
    
        @GetMapping
        public String hello(){
            return "Hello World";
        }
    }

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_16_color_FFFFFF_t_70_g_se_x_16][]

2、

package com.example.demo.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.*;
    
    @Controller
    @ResponseBody
    public class HelloController {
    
        @GetMapping("/hello")
        public String hello(){
            return "Hello World";
        }
    }

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_17_color_FFFFFF_t_70_g_se_x_16 2][]

或者：

package com.example.demo.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.*;
    
    @Controller
    
    public class HelloController {
    
        @GetMapping("/hello")
        @ResponseBody
        public String hello(){
            return "Hello World";
        }
    }

# @PathVariable #

给路径传入变量

1、

package com.example.demo.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.*;
    
    @RestController
    public class HelloController {
    
        @GetMapping("/hello/{id}")
        public String hello(@PathVariable int id){
            return "Hello World:"+id;
        }
    }

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_17_color_FFFFFF_t_70_g_se_x_16 3][]![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_17_color_FFFFFF_t_70_g_se_x_16 4][]

2、

package com.example.demo.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.*;
    
    @RestController
    public class HelloController {
    
        @GetMapping("/hello/{id}/{name}")
        public String hello(@PathVariable int id,@PathVariable String name){
            return "Hello World:"+id+name;
        }
    }

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_19_color_FFFFFF_t_70_g_se_x_16 2][]

# @RequestParam #

url传参

package com.example.demo.controller;
     
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.*;
    
    @RestController
    @RequestMapping("/user")
    public class UserController {
    
        @GetMapping("/hello")
        public String hello(@RequestParam String name){
            return "hello:"+name;
        }
    
    }

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_20_color_FFFFFF_t_70_g_se_x_16 4][]

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[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAfueWhg_size_18_color_FFFFFF_t_70_g_se_x_16]: /images/20220828/dd00bc717bea479fa0107d633c8b4366.png
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