SpringBoot拦截器的使用

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import com.imooc.controller.interceptor.OneInterceptor;
import com.imooc.controller.interceptor.TwoInterceptor;

@Configuration
public class WebMvcConfigurer extends WebMvcConfigurerAdapter {

	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		/**
		 * 拦截器按照顺序执行
		 */
		registry.addInterceptor(new TwoInterceptor()).addPathPatterns("/two/**");//.addPathPatterns("/one/**");

registry.addInterceptor(new OneInterceptor()).addPathPatterns("/one/**"); super.addInterceptors(registry); } }

package com.imooc.controller.interceptor;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

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

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.imooc.pojo.IMoocJSONResult;
import com.imooc.utils.JsonUtils;

public class OneInterceptor implements HandlerInterceptor  {

	/**
	 * 在请求处理之前进行调用（Controller方法调用之前）
	 */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, 
			Object object) throws Exception {
		
		System.out.println("被one拦截，放行...");
		return true;
		
		/*if (true) {
			returnErrorResponse(response, IMoocJSONResult.errorMsg("被one拦截..."));
		}
		
		return false;*/
	}
	
	/**
	 * 请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）
	 */
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, 
			Object object, ModelAndView mv)
			throws Exception {
		// TODO Auto-generated method stub
		
	}
	
	/**
	 * 在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行
	 * （主要是用于进行资源清理工作）
	 */
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, 
			Object object, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		
	}
	
	public void returnErrorResponse(HttpServletResponse response, IMoocJSONResult result) 
			throws IOException, UnsupportedEncodingException {
		OutputStream out=null;
		try{
		    response.setCharacterEncoding("utf-8");
		    response.setContentType("text/json");
		    out = response.getOutputStream();
		    out.write(JsonUtils.objectToJson(result).getBytes("utf-8"));
		    out.flush();
		} finally{
		    if(out!=null){
		        out.close();
		    }
		}
	}
}

　　

package com.imooc.controller.interceptor;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import com.imooc.pojo.User;

@Controller
@RequestMapping("one")
public class OneController {

	@RequestMapping("/index")
    public String index(ModelMap map) {
        map.addAttribute("name", "imooc22");
        return "thymeleaf/index";
    }
	
	@RequestMapping("center")
    public String center() {
        return "thymeleaf/center/center";
    }

	@RequestMapping("test")
    public String test(ModelMap map) {
		
		User user = new User();
		user.setAge(18);
		user.setName("manager");
		user.setPassword("123456");
		user.setBirthday(new Date());
		
		map.addAttribute("user", user);
		
		
		User u1 = new User();
		u1.setAge(19);
		u1.setName("imooc");
		u1.setPassword("123456");
		u1.setBirthday(new Date());
		
		User u2 = new User();
		u2.setAge(17);
		u2.setName("LeeCX");
		u2.setPassword("123456");
		u2.setBirthday(new Date());
		
		List<User> userList = new ArrayList<>();
		userList.add(user);
		userList.add(u1);
		userList.add(u2);
		
		map.addAttribute("userList", userList);
		
        return "thymeleaf/test";
    }
	
	@PostMapping("postform")
    public String postform(User user) {
		System.out.println(user.getName());
        return "redirect:/th/test";
    }
}

　　

package com.imooc.controller.interceptor;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.imooc.pojo.IMoocJSONResult;
import com.imooc.utils.JsonUtils;

public class TwoInterceptor implements HandlerInterceptor  {

	final static Logger log = LoggerFactory.getLogger(TwoInterceptor.class);
	
	/**
	 * 在请求处理之前进行调用（Controller方法调用之前）
	 */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object object) throws Exception {
		
		if (true) {
			returnErrorResponse(response, IMoocJSONResult.errorMsg("被two拦截..."));
		}
		
		System.out.println("被two拦截...");
		
		return false;
	}
	
	/**
	 * 请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）
	 */
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object object, ModelAndView mv)
			throws Exception {
		// TODO Auto-generated method stub
		
	}
	
	/**
	 * 在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）
	 */
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object object, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		
	}
	
	public void returnErrorResponse(HttpServletResponse response, IMoocJSONResult result) throws IOException, UnsupportedEncodingException {
		OutputStream out=null;
		try{
		    response.setCharacterEncoding("utf-8");
		    response.setContentType("text/json");
		    out = response.getOutputStream();
		    out.write(JsonUtils.objectToJson(result).getBytes("utf-8"));
		    out.flush();
		} finally{
		    if(out!=null){
		        out.close();
		    }
		}
	}
}

　　

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import com.imooc.pojo.User;

@Controller
@RequestMapping("two")
public class TwoController {

	@RequestMapping("/index")
    public String index(ModelMap map) {
        map.addAttribute("name", "itzixi22");
        return "thymeleaf/index";
    }
	
	@RequestMapping("center")
    public String center() {
        return "thymeleaf/center/center";
    }

	@RequestMapping("test")
    public String test(ModelMap map) {
		
		User user = new User();
		user.setAge(18);
		user.setName("manager");
		user.setPassword("123456");
		user.setBirthday(new Date());
		
		map.addAttribute("user", user);
		
		
		User u1 = new User();
		u1.setAge(19);
		u1.setName("itzixi");
		u1.setPassword("123456");
		u1.setBirthday(new Date());
		
		User u2 = new User();
		u2.setAge(17);
		u2.setName("LeeCX");
		u2.setPassword("123456");
		u2.setBirthday(new Date());
		
		List<User> userList = new ArrayList<>();
		userList.add(user);
		userList.add(u1);
		userList.add(u2);
		
		map.addAttribute("userList", userList);
		
        return "thymeleaf/test";
    }
	
	@PostMapping("postform")
    public String postform(User user) {
		System.out.println(user.getName());
        return "redirect:/th/test";
    }
}