解决拦截器抛出异常处理类的500状态码Html默认格式响应 ！

解决方式

        
            
            
                
                    
                        application/json;charset=UTF-8
                    
                
            
        
    

将Java对象转换为JSON格式的响应，使用spring-mvc.xml配置适当的消息转换器。

问题出处的相关类如下

interceptor如下

package com.ekgc.interceptor;

import com.ekgc.exception.UnLoginException;
import com.ekgc.pojo.SysUser;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 登录拦截器
 * 1.实现 HandlerInterceptor接口
 * 2.实现接口方法
 * 3.在springmvc.xml中配置拦截器
 * @author Magic
 * @version 1.0
 */
public class LoginInterceptor implements HandlerInterceptor {
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		System.out.println("preHandle...");
		// 记录请求处理开始时间
		request.setAttribute("startTime", System.currentTimeMillis());

		// 检查用户是否已经登录
		if (!isLoggedIn(request)) {
			//抛出未登录异常
			throw new UnLoginException("您还没有登录！！！");
		}
		return true;
	}

	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
		System.out.println("postHandle...");
		// 计算请求处理时间
		long startTime = (long) request.getAttribute("startTime");
		long endTime = System.currentTimeMillis();
		long executionTime = endTime - startTime;

		System.out.println("Request execution time: " + executionTime + " ms");
	}

	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
		System.out.println("afterCompletion...");
	}

	private boolean isLoggedIn(HttpServletRequest request) {
		// 检查用户是否已登录的逻辑
		HttpSession session = request.getSession();
		SysUser user = (SysUser) session.getAttribute("user");
		// 返回true表示已登录，false表示未登录
		if (user == null) {
			return false;
		}
		return true;
	}
}

 自定义异常类

package com.ekgc.exception;

/**
 * @author Magic
 * @version 1.0
 */
public class UnLoginException extends RuntimeException{
    public UnLoginException(String message) {
        super(message);
    }
}

 异常处理类

package com.ekgc.exception;

import com.ekgc.response.RespBody;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;



/**
 * 登录异常处理类
 * @author Magic
 * @version 1.0
 */
@ControllerAdvice
public class LoginExceptionHandler {

    @ExceptionHandler(UnLoginException.class)
    @ResponseBody
    public RespBody loginExceptionHandler(UnLoginException e) {
        String message = e.getMessage();
        System.out.println(message);
        return new RespBody(-1,message,message);
    }
}