spring controller springboot-controller的使用详解
JS_HCX 人气:0想了解springboot-controller的使用详解的相关内容吗,JS_HCX在本文为您仔细讲解spring controller的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:spring,boot,controller,springbootcontroller,下面大家一起来学习吧。
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(); } }
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