SpringBoot系列—1.IDEA搭建SpringBoot框架
SpringBoot系列—2.SpringBoot攔截器篇
SpringBoot系列—3.SpringBoot Redis篇
SpringBoot系列—4.SpringBoot 整合Mybatis祝旷、MP（MyBatis-Plus）
SpringBoot系列—5.SpringBoot 整合Mybatis-Plus分頁
1.新建攔截器類，實現(xiàn)HandlerInterceptor類，重寫preHandle昨凡、postHandle蠢箩、afterCompletion三個方法
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package com.example.demo.interceptor;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
public class MyInterceptor implements HandlerInterceptor {
/**
* 攔截器預處理 控制器方法未執(zhí)行
* @param request
* @param response
* @param handler
* @return
* @throws Exception
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("----------攔截器預處理----------");
String token = request.getParameter("token");
if(StringUtils.isEmpty(token)){
PrintWriter writer = null;
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html; charset=utf-8");
try {
writer = response.getWriter();
writer.print("沒有token參數(shù)");
} catch (IOException e) {
} finally {
if (writer != null)
writer.close();
}
return false;
}else{
return true;
}
}
/**
* 控制器方法執(zhí)行完畢
* @param request
* @param response
* @param handler
* @param modelAndView
* @throws Exception
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("----------控制器方法執(zhí)行完畢----------");
}
/**
* 處理完成
* @param request
* @param response
* @param handler
* @param ex
* @throws Exception
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("----------finish----------");
}
}
2.新建攔截器配置類拱层，將上一步寫的攔截器在這里配置虹菲，攔截路徑暫時以全部為例
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package com.example.demo.interceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
@Configuration
public class InterceptorConfig extends WebMvcConfigurationSupport {
@Override
protected void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");
super.addInterceptors(registry);
}
}
3.控制器打印一個記錄
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4.運行程序憋肖，瀏覽器測試攔截器是否有效
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