442 lines
9.8 KiB
Markdown
442 lines
9.8 KiB
Markdown
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因收到Google相关通知,网站将会择期关闭。相关通知内容
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06 WebFlux 中 Thymeleaf 和 MongoDB 实践
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前言
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本节内容主要还是总结上面两篇内容的操作,并实现一个复杂查询的小案例,那么没安装 MongoDB 的可以进行下面的安装流程。
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Docker 安装 MognoDB 并启动如下。
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(1)创建挂载目录:
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docker volume create mongo_data_db
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docker volume create mongo_data_configdb
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(2)启动 MognoDB:
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docker run -d \
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--name mongo \
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-v mongo_data_configdb:/data/configdb \
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-v mongo_data_db:/data/db \
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-p 27017:27017 \
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mongo \
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--auth
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(3)初始化管理员账号:
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docker exec -it mongo mongo admin
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// 容器名 // mongo命令 数据库名
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# 创建最高权限用户
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db.createUser({ user: 'admin', pwd: 'admin', roles: [ { role: "root", db: "admin" } ] });
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(4)测试连通性:
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docker run -it --rm --link mongo:mongo mongo mongo -u admin -p admin --authenticationDatabase admin mongo/admin
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MognoDB 基本操作
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类似 MySQL 命令,显示库列表:
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show dbs
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使用某数据库:
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use admin
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显示表列表:
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show collections
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如果存在 city 表,格式化显示 city 表内容:
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db.city.find().pretty()
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如果已经安装后,只要重启即可。
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查看已有的镜像:
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docker images
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然后 docker start mogno 即可,Mongo 是镜像唯一名词。
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结构
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类似上面讲的工程搭建,新建一个工程编写此案例,工程如图:
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核心目录如下:
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pom.xml Maven 依赖配置
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application.properties 配置文件,配置 mongo 连接属性配置
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dao 数据访问层
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controller 展示层实现
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新增 POM 依赖与配置
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在 pom.xml 配置新的依赖:
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<!-- Spring Boot 响应式 MongoDB 依赖 -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
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</dependency>
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<!-- 模板引擎 Thymeleaf 依赖 -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-thymeleaf</artifactId>
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</dependency>
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类似配了 MySQL 和 JDBC 驱动,肯定得去配置数据库。在 application.properties 配置中启动 MongoDB 配置。
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数据库名为 admin,账号密码也为 admin。
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spring.data.mongodb.host=localhost
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spring.data.mongodb.database=admin
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spring.data.mongodb.port=27017
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spring.data.mongodb.username=admin
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spring.data.mongodb.password=admin
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MongoDB 数据访问层 CityRepository
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修改 CityRepository 类,代码如下:
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import org.spring.springboot.domain.City;
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import org.springframework.data.mongodb.repository.ReactiveMongoRepository;
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import org.springframework.stereotype.Repository;
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@Repository
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public interface CityRepository extends ReactiveMongoRepository<City, Long> {
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Mono<City> findByCityName(String cityName);
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}
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CityRepository 接口只要继承 ReactiveMongoRepository 类即可。
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这里实现了通过城市名找出唯一的城市对象方法:
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Mono<City> findByCityName(String cityName);
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复杂查询语句实现也很简单,只要依照接口实现规范,即可实现对应 MySQL 的 where 查询语句。这里 findByxxx 的 xxx 可以映射任何字段,包括主键等。
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接口的命名是遵循规范的,常用命名规则如下:
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关键字
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方法命名
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And
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findByNameAndPwd
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Or
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findByNameOrSex
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Is
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findById
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Between
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findByIdBetween
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Like
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findByNameLike
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NotLike
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findByNameNotLike
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OrderBy
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findByIdOrderByXDesc
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Not
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findByNameNot
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处理器类 Handler 和控制器类 Controller
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修改下 Handler,代码如下:
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@Component
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public class CityHandler {
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private final CityRepository cityRepository;
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@Autowired
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public CityHandler(CityRepository cityRepository) {
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this.cityRepository = cityRepository;
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}
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public Mono<City> save(City city) {
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return cityRepository.save(city);
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}
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public Mono<City> findCityById(Long id) {
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return cityRepository.findById(id);
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}
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public Flux<City> findAllCity() {
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return cityRepository.findAll();
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}
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public Mono<City> modifyCity(City city) {
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return cityRepository.save(city);
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}
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public Mono<Long> deleteCity(Long id) {
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cityRepository.deleteById(id);
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return Mono.create(cityMonoSink -> cityMonoSink.success(id));
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}
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public Mono<City> getByCityName(String cityName) {
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return cityRepository.findByCityName(cityName);
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}
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}
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新增对应的方法,直接返回 Mono 对象,不需要对 Mono 进行转换,因为 Mono 本身是个对象,可以被 View 层渲染。继续修改控制器类 Controller,代码如下:
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@Autowired
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private CityHandler cityHandler;
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@GetMapping(value = "/{id}")
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@ResponseBody
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public Mono<City> findCityById(@PathVariable("id") Long id) {
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return cityHandler.findCityById(id);
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}
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@GetMapping()
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@ResponseBody
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public Flux<City> findAllCity() {
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return cityHandler.findAllCity();
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}
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@PostMapping()
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@ResponseBody
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public Mono<City> saveCity(@RequestBody City city) {
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return cityHandler.save(city);
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}
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@PutMapping()
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@ResponseBody
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public Mono<City> modifyCity(@RequestBody City city) {
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return cityHandler.modifyCity(city);
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}
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@DeleteMapping(value = "/{id}")
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@ResponseBody
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public Mono<Long> deleteCity(@PathVariable("id") Long id) {
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return cityHandler.deleteCity(id);
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}
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private static final String CITY_LIST_PATH_NAME = "cityList";
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private static final String CITY_PATH_NAME = "city";
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@GetMapping("/page/list")
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public String listPage(final Model model) {
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final Flux<City> cityFluxList = cityHandler.findAllCity();
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model.addAttribute("cityList", cityFluxList);
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return CITY_LIST_PATH_NAME;
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}
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@GetMapping("/getByName")
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public String getByCityName(final Model model,
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@RequestParam("cityName") String cityName) {
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final Mono<City> city = cityHandler.getByCityName(cityName);
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model.addAttribute("city", city);
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return CITY_PATH_NAME;
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}
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新增 getByName 路径,指向了新的页面 city。使用 @RequestParam 接收 GET 请求入参,接收的参数为 cityName,城市名称。视图返回值 Mono 或者 String 都行。
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Tymeleaf 视图
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然后编写两个视图 city 和 cityList,代码分别如下。
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city.html:
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<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8"/>
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<title>城市</title>
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</head>
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<body>
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<div>
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<table>
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<legend>
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<strong>城市单个查询</strong>
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</legend>
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<tbody>
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<td th:text="${city.id}"></td>
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<td th:text="${city.provinceId}"></td>
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<td th:text="${city.cityName}"></td>
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<td th:text="${city.description}"></td>
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</tbody>
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</table>
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</div>
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</body>
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</html>
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cityList.html:
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<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8"/>
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<title>城市列表</title>
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</head>
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<body>
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<div>
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<table>
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<legend>
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<strong>城市列表</strong>
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</legend>
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<thead>
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<tr>
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<th>城市编号</th>
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<th>省份编号</th>
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<th>名称</th>
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<th>描述</th>
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</tr>
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</thead>
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<tbody>
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<tr th:each="city : ${cityList}">
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<td th:text="${city.id}"></td>
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<td th:text="${city.provinceId}"></td>
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<td th:text="${city.cityName}"></td>
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<td th:text="${city.description}"></td>
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</tr>
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</tbody>
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</table>
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</div>
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</body>
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</html>
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运行工程
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一个 CRUD 的 Spring Boot Webflux 工程就开发完毕了,下面运行工程验证一下。使用 IDEA 右侧工具栏,单击 Maven Project Tab 按钮,然后单击使用下 Maven 插件的 install 命令;或者使用命令行的形式,在工程根目录下,执行 Maven 清理和安装工程的指令:
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cd springboot-webflux-5-thymeleaf-mongodb
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mvn clean install
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在控制台中看到成功的输出:
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... 省略
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[INFO] ------------------------------------------------------------------------
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[INFO] BUILD SUCCESS
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[INFO] ------------------------------------------------------------------------
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[INFO] Total time: 01:30 min
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[INFO] Finished at: 2017-10-15T10:00:54+08:00
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[INFO] Final Memory: 31M/174M
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[INFO] ------------------------------------------------------------------------
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在 IDEA 中执行 Application 类启动,任意正常模式或者 Debug 模式。可以在控制台看到成功运行的输出:
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... 省略
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2018-04-10 08:43:39.932 INFO 2052 --- [ctor-http-nio-1] r.ipc.netty.tcp.BlockingNettyContext : Started HttpServer on /0:0:0:0:0:0:0:0:8080
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2018-04-10 08:43:39.935 INFO 2052 --- [ main] o.s.b.web.embedded.netty.NettyWebServer : Netty started on port(s): 8080
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2018-04-10 08:43:39.960 INFO 2052 --- [ main] org.spring.springboot.Application : Started Application in 6.547 seconds (JVM running for 9.851)
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打开 POST MAN 工具,开发必备,进行下面操作。
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新增城市信息 POST http://127.0.0.1:8080/city:
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打开浏览器,访问 http://localhost:8080/city/getByName?cityName=杭州,可以看到如图的响应:
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继续访问 http://localhost:8080/city/page/list,发现没有值,那么按照上一篇的内容插入几条数据即可有值,如图:
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总结
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这里初步实现了一个简单的整合,具体复杂的案例我们在后面的综合案例中实现,会很酷炫。下面整合 Redis,基于 Redis 可以实现常用的缓存、锁,下一篇我们将学习如何整合 Reids。
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