springboot 配置拦截器

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最新推荐文章于 2024-02-17 16:59:43 发布

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分类专栏： springboot java 文章标签： springboot

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本文介绍了一个使用Spring MVC实现的示例项目，该项目包含两个控制器和两个拦截器。每个控制器负责处理不同的URL路径，并向视图传递数据。此外，还定义了两个拦截器来处理请求的不同阶段。

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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.example.demo.pojo.User;


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

	@RequestMapping("/index")
    public String index(ModelMap map) {
        map.addAttribute("name", "liunn");
        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("liunn1");
		user.setPassword("123456");
		user.setBirthday(new Date());
		
		map.addAttribute("user", user);
		
		
		User u1 = new User();
		u1.setAge(19);
		u1.setName("liunn2");
		u1.setPassword("123456");
		u1.setBirthday(new Date());
		
		User u2 = new User();
		u2.setAge(17);
		u2.setName("liunn3");
		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";
    }
}



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.example.demo.pojo.User;



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

	@RequestMapping("/index")
    public String index(ModelMap map) {
        map.addAttribute("name", "liunntwo");
        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("liunntwo");
		user.setPassword("123456");
		user.setBirthday(new Date());
		
		map.addAttribute("user", user);
		
		
		User u1 = new User();
		u1.setAge(19);
		u1.setName("liunntwo1");
		u1.setPassword("123456");
		u1.setBirthday(new Date());
		
		User u2 = new User();
		u2.setAge(17);
		u2.setName("liunntwo2");
		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";
    }
}

写了两个controller，用于拦截不同路径。

import java.io.OutputStream;

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

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

import com.example.demo.pojo.SysUser;
import com.fasterxml.jackson.databind.ObjectMapper;

public class OneInterceptor implements HandlerInterceptor {

	//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 handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		//HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
	}

	//请求处理后视图渲染钱
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		// TODO Auto-generated method stub
		//HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
	}

	//在请求处理前调用controller方法
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		// TODO Auto-generated method stub
		return HandlerInterceptor.super.preHandle(request, response, handler);
	}
	public void returnErrorRespone( HttpServletResponse response, SysUser u)
			throws Exception  {
		OutputStream out=null;
		try {
			response.setCharacterEncoding("utf-8");
			response.setContentType("text/json");
			out=response.getOutputStream();
			ObjectMapper objectMapper=new ObjectMapper();
			String users=objectMapper.writeValueAsString(u);
			out.write(users.getBytes("utf-8"));
			out.flush();
		} finally {
			// TODO: handle finally clause
			out.flush();
		}
		
		
		
		
		
	}
	
}



import java.io.OutputStream;

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

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

import com.example.demo.pojo.SysUser;
import com.fasterxml.jackson.databind.ObjectMapper;

public class TwoInterceptor implements HandlerInterceptor {


	//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 handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		//HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
	}

	//请求处理后视图渲染钱
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		// TODO Auto-generated method stub
		//HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
	}

	//在请求处理前调用controller方法
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		// TODO Auto-generated method stub
		return HandlerInterceptor.super.preHandle(request, response, handler);
	}
	public void returnErrorRespone( HttpServletResponse response, SysUser u)
			throws Exception  {
		OutputStream out=null;
		try {
			response.setCharacterEncoding("utf-8");
			response.setContentType("text/json");
			out=response.getOutputStream();
			ObjectMapper objectMapper=new ObjectMapper();
			String users=objectMapper.writeValueAsString(u);
			out.write(users.getBytes("utf-8"));
			out.flush();
		} finally {
			// TODO: handle finally clause
			out.flush();
		}
		
		
		
		
		
	}
	

}

两个拦截器

写一个类继承WebMvcConfigurerAdapter



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

import com.example.demo.controller.interceptor.OneInterceptor;
import com.example.demo.controller.interceptor.TwoInterceptor;
@Configuration
public class WebMvcConfigurer extends WebMvcConfigurerAdapter{

	
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		//添加拦截器OneInterceptor拦截路径为/two/**和 /one/**
		registry.addInterceptor(new OneInterceptor()).addPathPatterns("/two/**")
		                                                                  .addPathPatterns("/one/**");
        registry.addInterceptor(new TwoInterceptor()).addPathPatterns("/one/**");

super.addInterceptors(registry);
	}
	
	
	
}