springboot——拦截器

config包中的代码

package demo.config;

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

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

@Configuration
public class SpringMVCConfig extends WebMvcConfigurerAdapter{

	@Override
	
	public void addInterceptors(InterceptorRegistry registry) {
		
		HandlerInterceptor handlerInterceptor = new HandlerInterceptor() {//匿名对象
			
			@Override
			
			public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
					throws Exception {
				System.out.println("***** preHandle*****");
				String name = request.getParameter("name");
				if("admin".equals(name)){
					return true;//放行
				}else{
					return false;//不放行
				}
			}
			
			
			@Override
			public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
					ModelAndView modelAndView) throws Exception {
				System.out.println("***** postHandle*****");
				
			}
			
			
			
			@Override
			public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
					throws Exception {
				System.out.println("***** afterCompletion*****");
			}
		};
		
		registry.addInterceptor(handlerInterceptor);//拦截器添加进来
	} 
}

controller中的代码-TestController

package demo.controller;

import java.util.Arrays;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import demo.entity.User;

@Controller

//各类配置一个路径
//@RequestMapping("test")
//那么该如何调用该类下的方法呢？------------http://127.0.0.1:8080/test/t1
public class TestController {

	@RequestMapping(value = "hello" , method = RequestMethod.GET)
	@ResponseBody
	public String helloWorld(){
		System.out.println("进入到controller里来了！");
		return "hello world1";
	}
	
	//解析json,搭配User实体，响应json
	@RequestMapping("t1")
	@ResponseBody
	public User test1(){
		return new User("tom", 18);
	}
	
	//请求传参----简单参数(不仅有简单参数，还有复杂参数)
	//测试路径：http://127.0.0.1:8080/t2?name=tom1&age=19
	@RequestMapping("t2")
	@ResponseBody
	public String test2(String name,int age){
		return "Request参数是：name="+name+",age="+age;
	}
	
	//请求传参----数组(复杂参数)
	//测试路径：http://127.0.0.1:8080/t3?hobby=eat&hobby=drink
	@RequestMapping("t3")
	@ResponseBody
	public String test3(String[] hobby){
		return "Request参数是："+Arrays.toString(hobby);
	}
	
	//实体传参
	//测试路径：http://127.0.0.1:8080/t2?name=tom1&age=20
	@RequestMapping("t4")
	@ResponseBody
	public User test4(User user){
		return user;
	}
	
	
	
	@RequestMapping("t5")
	public String test5(HttpServletRequest request){
		request.setAttribute("str","你好！测试请求转发。");
		return "forward:result";//相对路径   (绝对路径：forward:/test/result)
	}
	
	
	@RequestMapping("t6")
	public String test6(HttpServletRequest request){
		request.setAttribute("str","你好！测试重定向。");
		return "redirect:result";
	}
	
	
	@RequestMapping("result")
	@ResponseBody
	public String result(HttpServletRequest request){
		String reslut = request.getAttribute("str")+"";
		
		return "Request域中的str的值："+reslut;
	}
}

主方法，MainApplication

package demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MainApplication {

	public static void main(String[] args) {
		SpringApplication.run(MainApplication.class, args);

	}
}

注意：拦截器目前设置的条件是只运行name=admin的条件通过。
运行网址：http://127.0.0.1:8090/hello?name=admin
**运行方式：右键单击主方法程序——run as —— java application 然后按照上面的运行网址，运行程序，浏览器中会出现如下画面 **

返回到程序编辑窗口，查看console,出现如下画面，证明拦截器设置成功。