正常情况下我们使用Springboot时在Controller中返回视图只需要 return "login" 就可以返回对应的Templates中的login.html页面，但其实每次访问都是我们的服务器将该页面的所有资源都发送给浏览器，对于用户经常访问并且页面一般不需要改动的页面我们可以将其放入我们的Redis中做缓存，这样可以提高我们服务器的效率提升用户的体验。

        我这里前端模板用的是thymeleaf

pom.xml

        
            commons-codec
            commons-codec
        
        
            org.apache.commons
            commons-lang3
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-data-redis
        
        
            org.apache.commons
            commons-pool2
        
        
            org.projectlombok
            lombok
        
        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        
    

application.yaml

server:
  port: 8080
#redis
spring:
  redis:
    #服务器地址
    host: localhost
    #端口
    port: 6379
    #数据库
    database: 0
    #超时时间
    connect-timeout: 10000ms
    lettuce:
      pool:
        #最大连接数，默认是8
        max-active: 8
        #最大连接阻塞等待时间 默认是-1
        max-wait: 10000ms
        #最大空闲连接，默认是8
        max-idle: 200
        #最小空闲连接，默认是0
        min-idle: 5

config中RedisConfig类

package com.shao.cache.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
public class RedisConfig {

    @Bean
    public RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory){
        RedisTemplate redisTemplate = new RedisTemplate();
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        return redisTemplate;
    }
}

前端资源login.html

       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
    

    

           
用户登录
           
               
                   请输入手机号码
                   
                       
                   
                   
                   
               
           
           
               
                   请输入密码
                   
                       
                   
               
           
           
               
                   重置
               
               
                   登录
               
           
    
    
    

Controller中的DemoController类

package com.shao.cache.controller;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.thymeleaf.context.WebContext;
import org.thymeleaf.spring5.view.ThymeleafViewResolver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.concurrent.TimeUnit;

@Controller
@RequestMapping("/demo")
public class DemoController {

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private ThymeleafViewResolver thymeleafViewResolver;

    @RequestMapping("test01")
    public String test01(Model model){
        model.addAttribute("username","赵六");
        return "login";
    }

    @ResponseBody
    @RequestMapping(value = "test02",produces = "text/html;charset=utf-8")
    public String test02(Model model, HttpServletRequest request, HttpServletResponse response){
        ValueOperations valueOperations = redisTemplate.opsForValue();
        String html = (String) valueOperations.get("login.html");
        if(StringUtils.isNotEmpty(html)){
            return html;
        }
        String username = "张三";
        model.addAttribute("username",username);

        //如果为空,手动渲染,存入redis并返回
        WebContext webContext = new WebContext(request,response, request.getServletContext(),request.getLocale(), model.asMap());
        html = thymeleafViewResolver.getTemplateEngine().process("login",webContext);
        valueOperations.set("login.html",html,1, TimeUnit.MINUTES);
        return html;
    }
}

说明：

test01接口是正常的访问返回视图

test02接口是将整个页面放入Redis中并且有效时间是1分钟

测试test01接口

 测试test02接口

 Redis中确实存入的是整个页面

 查询对应的key存活时间 此处是还有54秒失效

Controller中要在对应的做页面缓存的接口中加入如下

    @ResponseBody
    @RequestMapping(value = "test02",produces = "text/html;charset=utf-8")

不然解析器无法识别返回的字符串

在接口中缓存页面的几个主要步骤

1.判断是否有该缓存

2.有直接返回

3.没有就存入缓存

        Ⅰ手动渲染

        Ⅱ存入缓存并设置失效时间

4.返回该缓存