SpringBoot unified processing: login verification interceptor, exception handling, data format return

Tech 2023-05-23 00:16:13 Source: Network

Spring Boot AOP HandlerInterceptor + WebMvcConfigurer @RestControllerAdvice + @ExceptionHandler @ControllerAdvice @ResponseBodyAdvice1. Session Session Spring AOP Spring 1

Spring Boot AOP

HandlerInterceptor + WebMvcConfigurer
@RestControllerAdvice + @ExceptionHandler
@ControllerAdvice @ResponseBodyAdvice

1.

Session Session
Spring AOP
Spring

1.1

@RestController@RequestMapping("/user")public class UserController {    @RequestMapping("/a1")    public Boolean login (HttpServletRequest request) {        //  Session         HttpSession session = request.getSession(false);        if (session != null && session.getAttribute("userinfo") != null) {            //             return true;        } else {            //             return false;        }    }    @RequestMapping("/a2")    public Boolean login2 (HttpServletRequest request) {        //  Session         HttpSession session = request.getSession(false);        if (session != null && session.getAttribute("userinfo") != null) {            //             return true;        } else {            //             return false;        }    }}

1.2 Spring AOP

Spring AOP

@Aspect // @Componentpublic class UserAspect {    //  Controller     @Pointcut("execution(* com.example.springaop.controller..*.*(..))")    public void  pointcut(){}        //     @Before("pointcut()")    public void doBefore() {}        //     @Around("pointcut()")    public Object doAround(ProceedingJoinPoint joinPoint) {        Object obj = null;        System.out.println("Around ");        try {            obj = joinPoint.proceed();        } catch (Throwable e) {            e.printStackTrace();        }        System.out.println("Around ");        return obj;    }}

Spring AOP

HttpSession Request
aspectJ

1.3 Spring

Spring AOP Spring HandlerInterceptor

1. Spring HandlerInterceptor preHandle

@Configuration
WebMvcConfigurer
addInterceptors

1

/** * @Description:  * @Date 2023/2/13 13:06 */@Componentpublic class LoginIntercept implements HandlerInterceptor {    //  true     //  false     @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,                             Object handler) throws Exception {        // 1. HttpSession         HttpSession session = request.getSession(false);        if (session != null && session.getAttribute("userinfo") != null) {            //             return true;        }        //         response.sendRedirect("/login.html");        return false;    }}

2

addPathPatterns URL**
excludePathPatterns URL

URLJS CSS

/** * @Description:  * @Date 2023/2/13 13:13 */@Configurationpublic class AppConfig implements WebMvcConfigurer {    @Resource    private LoginIntercept loginIntercept;    @Override    public void addInterceptors(InterceptorRegistry registry) {//        registry.addInterceptor(new LoginIntercept());//new         registry.addInterceptor(loginIntercept).                addPathPatterns("/**").    //  url                excludePathPatterns("/user/login"). //                excludePathPatterns("/user/reg").                excludePathPatterns("/login.html").                excludePathPatterns("/reg.html").                excludePathPatterns("/**/*.js").                excludePathPatterns("/**/*.css").                excludePathPatterns("/**/*.png").                excludePathPatterns("/**/*.jpg");    }}

1.4

session

1.3

1 html

2 controller UserController

@RestController@RequestMapping("/user")public class UserController {    @RequestMapping("/login")    public boolean login(HttpServletRequest request,String username, String password) {        boolean result = false;        if (StringUtils.hasLength(username) && StringUtils.hasLength(password)) {            if(username.equals("admin") && password.equals("admin")) {                HttpSession session = request.getSession();                session.setAttribute("userinfo","userinfo");                return true;            }        }        return result;    }    @RequestMapping("/index")    public String index() {        return "Hello Index";    }}

1.5

Controller

Controller DispatcherServlet

DispatcherServlet doDispatch doDispatch

Sping

1.6

api c

@Configurationpublic class AppConfig implements WebMvcConfigurer {    //  api     @Override    public void configurePathMatch(PathMatchConfigurer configurer) {        configurer.addPathPrefix("api", c -> true);    }}

2.

@ControllerAdvice

@ExceptionHandler(xxx.class)

@RestController@RequestMapping("/user")public class UserController {    @RequestMapping("/index")    public String index() {        int num = 10/0;        return "Hello Index";    }}

config MyExceptionAdvice

@RestControllerAdvice //  Controller public class MyExceptionAdvice {    @ExceptionHandler(ArithmeticException.class)    public HashMap<String,Object> arithmeticExceptionAdvice(ArithmeticException e) {        HashMap<String, Object> result = new HashMap<>();        result.put("state",-1);        result.put("data",null);        result.put("msg" , ""+ e.getMessage());        return result;    }}

@ControllerAdvicepublic class MyExceptionAdvice {    @ExceptionHandler(ArithmeticException.class)    @ResponseBody    public HashMap<String,Object> arithmeticExceptionAdvice(ArithmeticException e) {        HashMap<String, Object> result = new HashMap<>();        result.put("state",-1);        result.put("data",null);        result.put("msg" , ""+ e.getMessage());        return result;    }}

@ExceptionHandler(NullPointerException.class)public HashMap<String,Object> nullPointerExceptionAdvice(NullPointerException e) {    HashMap<String, Object> result = new HashMap<>();    result.put("state",-1);    result.put("data",null);    result.put("msg" , ""+ e.getMessage());    return result;}@RequestMapping("/index")public String index(HttpServletRequest request,String username, String password) {    Object obj = null;    System.out.println(obj.hashCode());    return "Hello Index";}

Exception Exception

@ExceptionHandler(Exception.class)public HashMap<String,Object> exceptionAdvice(Exception e) {    HashMap<String, Object> result = new HashMap<>();    result.put("state",-1);    result.put("data",null);    result.put("msg" , ""+ e.getMessage());    return result;}

3.

3.1

1. @ControllerAdvice

2. ResponseBodyAdvice

supports true
beforeBodyWrite

@ControllerAdvicepublic class MyResponseAdvice implements ResponseBodyAdvice {    //  boolean true  beforeBodyWrite     //  false     @Override    public boolean supports(MethodParameter returnType, Class converterType) {        return true;    }    //     @Override    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {        HashMap<String,Object> result = new HashMap<>();        result.put("state",1);        result.put("data",body);        result.put("msg","");        return result;    }}@RestController@RequestMapping("/user")public class UserController {    @RequestMapping("/login")    public boolean login(HttpServletRequest request,String username, String password) {        boolean result = false;        if (StringUtils.hasLength(username) && StringUtils.hasLength(password)) {            if(username.equals("admin") && password.equals("admin")) {                HttpSession session = request.getSession();                session.setAttribute("userinfo","userinfo");                return true;            }        }        return result;    }    @RequestMapping("/reg")    public int reg() {        return 1;    }}

3.2 @ControllerAdvice

@ControllerAdvice

1 @ControllerAdvice

@ControllerAdvice @Component InitializingBean

2 initializingBean

Spring MVC RequestMappingHandlerAdapter afterPropertiesSet

3 initControllerAdviceCache

@ControllerAdvice Advice Advice

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