springboot-controller的使用详解

Controller的使用

一、

  • @Controller:处理http请求
  • @RestController:Spring4之后新加的注解,原来返回json需要@ResponseBody配合@Controller
  • @RequestMapping:配置url映射

1.对于控制器层,如果只使用@Controller注解,会报500,即controller必须配合一个模板来使用:

使用spring官方的一个模板:

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-thymeleaf</artifactId>

</dependency>

在resources下面的templates文件夹下建立index.html:

<h1>hello Spring Boot!</h1>

HelloController:

@Controller

@ResponseBody

public class HelloController {

@Autowired

private GirlProperties girlProperties;

@RequestMapping(value = "/hello",method = RequestMethod.GET)

public String say(){

// return girlProperties.getCupSize();

return "index";

}

}

@RestController相当于@Controller和@ResponseBody组合使用

如果程序需要通过hello和hi都能访问到,只需在@RequestMapping的value中添加如下:

@RestController

public class HelloController {

@Autowired

private GirlProperties girlProperties;

@RequestMapping(value = {"/hello", "/hi"},method = RequestMethod.GET)

public String say(){

return girlProperties.getCupSize();

}

}

二、

  • @PathVariable:获取url中的数据
  • @RequestParam:获取请求参数的值
  • @GetMapping:组合注解

@PathVariable:

方式一:

@RestController

@RequestMapping("/hello")

public class HelloController {

@Autowired

private GirlProperties girlProperties;

@RequestMapping(value = {"/say/{id}"},method = RequestMethod.GET)

public String say(@PathVariable("id") Integer id){

return "id:"+id;

// return girlProperties.getCupSize();

}

}

结果:

方式二:也可以把id写在前面:

@RestController

@RequestMapping("/hello")

public class HelloController {

@Autowired

private GirlProperties girlProperties;

@RequestMapping(value = {"/{id}/say"},method = RequestMethod.GET)

public String say(@PathVariable("id") Integer id){

return "id:"+id;

// return girlProperties.getCupSize();

}

}

结果:

方式三:使用传统方式访问:

@RestController

@RequestMapping("/hello")

public class HelloController {

@Autowired

private GirlProperties girlProperties;

@RequestMapping(value = "/say",method = RequestMethod.GET)

public String say(@RequestParam("id") Integer myId){

return "id:"+myId; //方法参数中的Integer id这个id不需要与前面对应

// return girlProperties.getCupSize();

}

}

结果:

注解简写:@RequestMapping(value = "/say",method = RequestMethod.GET)等价于:@GetMapping(value = "/say")

@RestController

@RequestMapping("/hello")

public class HelloController {

@Autowired

private GirlProperties girlProperties;

// @RequestMapping(value = "/say",method = RequestMethod.GET)

//@GetMapping(value = "/say")//等价于上面的

@PostMapping(value = "/say")

public String say(@RequestParam("id") Integer myId){

return "id:"+myId; //方法参数中的Integer id这个id不需要与前面对应

// return girlProperties.getCupSize();

}

}

以上是 springboot-controller的使用详解 的全部内容, 来源链接: utcz.com/p/214436.html

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