SpringBoot unified processing: login verification interceptor, exception handling, data format return
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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; } }}
- AOP
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
2.
- @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"; }}
3


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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Tag: SpringBoot unified processing login verification interceptor exception handling data
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