全局异常处理类

import com.demo.vo.HttpResult;
import org.springframework.validation.BindException;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import java.util.ArrayList;
import java.util.List;
 * 定义全局异常类
 * 全局异常控制类加入拦截
@RestControllerAdvice
public class GlobalExceptionHandle {
    @ExceptionHandler(value = BindException.class)
    public HttpResult bindExceptionErrorHandler(BindException ex) throws Exception {
        List<String> errorList=new ArrayList<>();
        if(ex.hasErrors()){
            List<ObjectError> list=ex.getAllErrors();
            for(ObjectError objectError:list){
                errorList.add(objectError.getDefaultMessage());
//            ex.getAllErrors().forEach( objectError -> errorList.add(objectError.getDefaultMessage()));
        if(!errorList.isEmpty()){
            return HttpResult.error(errorList);
        return HttpResult.error();
2.0 拦截器
2.1 拦截器类
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("my interceptor prehandles");
        return true;
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("my interceptor postHandler");
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("my interceptor aferCompletion");
2.2 开启拦截器
import com.demo.interceptor.MyInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**").excludePathPatterns("/hello");
拦截器中方法的执行顺序：preHandle-->Controller-->postHandle-->afterCompletion
                            
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类型： 滑块验证码
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