标签：pat index isp IV oid lap alt cat ring
Controller中注解的使用:
@Controller
●该注解用来响应页面，必须配合模板来使用
关于模板的使用，下一节会说到。
@RestController
●该注解可以直接响应字符串，返回的类型为JSON格式
1 package com.example.demo.controller; 2 3 import org.springframework.web.bind.annotation.RequestMapping; 4 import org.springframework.web.bind.annotation.RestController; 5 6 @RestController 7 public class HelloWorldController { 8 9 @RequestMapping("/") 10 public String index() { 11 return "Hello World"; 12 } 13 }
启动程序，访问http://localhost:8080/，返回Hello World
@RequestMapping
●指定URL访问中的前缀
1 package com.example.demo; 2 3 import org.springframework.boot.SpringApplication; 4 import org.springframework.boot.autoconfigure.SpringBootApplication; 5 6 @SpringBootApplication 7 public class DemoApplication { 8 9 public static void main(String[] args) { 10 SpringApplication.run(DemoApplication.class, args); 11 } 12 }
访问http://localhost:8080/hello，返回Hello World
@RequestParam
●获取请求URL中参数的变量
1 package com.example.demo.controller; 2 3 import org.springframework.web.bind.annotation.RequestMapping; 4 import org.springframework.web.bind.annotation.RequestMethod; 5 import org.springframework.web.bind.annotation.RequestParam; 6 import org.springframework.web.bind.annotation.RestController; 7 8 @RestController 9 public class HelloWorldController { 10 11 @RequestMapping(value="/hello",method=RequestMethod.GET) 12 public String index(@RequestParam("name")String name) { 13 return "Hello World:"+name; 14 } 15 }
访问http://localhost:8080/hello?name=张三，返回Hello World：张三
@PathVariable
●获取请求URL中路径的变量
1 package com.example.demo.controller; 2 3 import org.springframework.web.bind.annotation.PathVariable; 4 import org.springframework.web.bind.annotation.RequestMapping; 5 import org.springframework.web.bind.annotation.RequestMethod; 6 import org.springframework.web.bind.annotation.RestController; 7 8 @RestController 9 public class HelloWorldController { 10 11 @RequestMapping(value="/hello/{name}",method=RequestMethod.GET) 12 public String index(@PathVariable("name")String name) { 13 return "Hello World:"+name; 14 } 15 }
访问http://localhost:8080/hello/张三，返回Hello World：张三
@GetMapping/@PostMapping
●与RequestMapping类似，不同的是指定了请求的方式(get/post)
1 package com.example.demo.controller; 2 3 import org.springframework.web.bind.annotation.GetMapping; 4 import org.springframework.web.bind.annotation.RestController; 5 6 @RestController 7 public class HelloWorldController { 8 9 @GetMapping(value="/hello") 10 public String index() { 11 return "Hello World"; 12 } 13 }
总结
Controller是SpringBoot里比较常用的组件，通过匹配客户端提交的请求，分配不同的处理方法，然后向客户端返回结果。
标签：pat index isp IV oid lap alt cat ring
原文地址：https://www.cnblogs.com/ganjing/p/9206845.html
