Spring boot進階-配置Controller、interceptor...

1、配置SpringBootApplication(對spring boot來說這是最基本)

package io.github.syske.springboot31;

import org.springframework.boot.Banner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Configuration;

@Configuration
@SpringBootApplication
public class SpringBoot31Application {

    public static void main(String[] args) {

        //SpringApplication.run(SpringBoot31Application.class, args);
        SpringApplication application = new SpringApplication(SpringBoot31Application.class);
        //關閉banner，也可以通過在resouces文件夾下添加banner.txt替換banner，banner生成網站
        // http://patorjk.com/software/taag/#p=testall&h=0&f=Chiseled&t=syske
        application.setBannerMode(Banner.Mode.OFF);
        application.run(args);
    }
}

2、創建配置類

完整配置

package io.github.syske.springboot31.config;

import io.github.syske.springboot31.formatter.DateFomaters;
import io.github.syske.springboot31.interceptor.SessionInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class Webconfig implements WebMvcConfigurer {
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/user/login.html").setViewName("login");
    }


    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new SessionInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/login","/user/login.html","/bootsrap/**");
    }

    @Override
    public void addFormatters(FormatterRegistry registry) {
        //給當前的Spring容器中添加自定義格式轉換器.
        registry.addConverter(new DateFomaters());
    }
}

3、配置Controller

controller是在配置類中添加的

• 主要是針對一些僅需要返回頁面的Controller，如果需要model操作則不適用

 @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/user/login.html").setViewName("login");
    }

• 主要是通過addViewController方法進行添加，方法中傳入的是訪問的路徑，上面配置的訪問路徑為：http://localhost:8080/user/login.html, setViewName方法設置的是返回的視圖名，我的配置對應的是login.html
• 方法內可以配置多個視圖模型

4、配置DateFomatters

自定義的convertor

package io.github.syske.springboot31.formatter;


import org.springframework.core.convert.converter.Converter;
import org.springframework.util.StringUtils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateFomaters implements Converter<String, Date> {



    @Override
    public Date convert(String source) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Date date = null;
        if(!StringUtils.isEmpty(source)) {
            try {
                date = dateFormat.parse(source);
            } catch (ParseException e) {
                e.printStackTrace();
            }
        }
        return date;
    }
}

將自定義的轉化類添加到Spring boot配置中

  @Override
    public void addFormatters(FormatterRegistry registry) {
        //給當前的Spring容器中添加自定義格式轉換器.
        registry.addConverter(new DateFomaters());
    }

5、配置攔截器（Interceptor）

自定義攔截器

package io.github.syske.springboot31.interceptor;

import org.springframework.web.servlet.mvc.WebContentInterceptor;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class SessionInterceptor extends WebContentInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws ServletException {
        Object username = request.getSession().getAttribute("username");
        if(username != null) {
            return true;
        } else {
            try {
                request.getRequestDispatcher("/user/login.html").forward(request,response);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return false;
        }
    }
}

將自定義的攔截器添加到Spring boot配置中

 @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new SessionInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/login","/user/login.html","/bootsrap/**");
    }

6、測試

登錄攔截測試，以及格式化打印

package io.github.syske.springboot31.controller;

import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;
import java.util.Date;

@Controller
public class LoginController {
    @RequestMapping("/login")
    public String login(String username, Date logindate, HttpSession session) {
        if(!StringUtils.isEmpty(username)) {
            session.setAttribute("username", username);
            System.out.println(logindate);
            return "index";
        }
        return "login";

    }
}