MVC

model-view-controller

Controller和RestController

Controller

• 适合前后端不分离
• 返回数据+视图(html)
  

RestController

RequestMapping

• 可以直接传入自定义类,但是参数名称和顺序必须完全一致

	@RequestMapping(value="/test1",method= RequestMethod.GET)
    public String test1(User user){
        System.out.println(user.getUsername());
        System.out.println(user.getPassword());
        return "hello world!";
    }

• 支持传入的参数与控制器接受的参数名称不一致，但需要RequestParam注解

    @RequestMapping(value="/test2",method= RequestMethod.GET)
    public String test2(@RequestParam(value="username",required = false) String nickname,
                        @RequestParam(value="password",required = false)String ciphertext){
        System.out.println(nickname);
        System.out.println(ciphertext);
        return "Get请求!";
    }

• 两个通配符表示/之后所有内容都能识别

@RequestMapping(value="/test3/**",method= RequestMethod.GET)
    public String test3(String username,String password){
        System.out.println(username);
        System.out.println(password);
        return "Get请求!";
    }

• 放在url里面还是body里面都能识别参数

@RequestMapping(value="/test4",method= RequestMethod.POST)
    public String test4(String username,String password){
        System.out.println(username);
        System.out.println(password);
        return "Get请求!";
    }

• json格式的POST请求,使用RequestBody注解包裹

    @RequestMapping(value="/test5",method= RequestMethod.POST)
    public String test5(@RequestBody  User user){
        System.out.println(user.getUsername());
        System.out.println(user.getPassword());
        return "Get请求!";
    }

• 配置文件:继承WebMvcConfigurer ，使用Configuration注释
  src/java/config/WebConfig.java

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor());
    }
}

• 配置拦截器，继承HandlerInterceptor。

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("拦截成功!");
        return true;
    }

}

RESTful API