Java后端初始化项目（项目模板）-编程知识

介绍

emmmm，最近看了一些网络资料，也是心血来潮，想自己手工搭建一个java后端的初始化项目模板来简化一下开发，也就发一个模板的具体制作流程，（一步一步搭建，从易到难）

ok，现在开始搭建

第一步：创建SpringBoot项目

这一步大家应该都知道，然后呢，加上Spring Web，MyBatis，和MySQL Driver这三个依赖（后面会添加其他依赖，就先引入这几个吧）

添加完了之后查看一下pom文件，

    <modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.0.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><artifactId>cetide</artifactId><version>0.0.1-SNAPSHOT</version><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>commons-codec</groupId><artifactId>commons-codec</artifactId><version>1.14</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.10</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.23</version></dependency><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.2.13</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.3</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>

这就是项目我目前引入的依赖了，然后呢，先配置一下配置文件（这一点很重要）（这里用yml文件感觉更好一些）


spring.datasource.url=jdbc:mysql://localhost:3306/user_db?serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=1234mybatis.mapper-locations=classpath:com/cetide/init/dao/*.xmlspring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.url-pattern=/druid/*
spring.datasource.druid.stat-view-servlet.login-username=druid
spring.datasource.druid.stat-view-servlet.login-password=druid
spring.datasource.druid.stat-view-servlet.allow=
spring.datasource.druid.stat-view-servlet.deny=spring.jackson.deserialization.fail-on-unknown-properties=false
spring.jackson.default-property-inclusion=non_null

emmm，连接上mysql之后可以试试启动一下项目，看看能不能正常运行，（我觉得这点就很重要，写一段就运行一下，不然写多了，运行失败找问题感觉就很麻烦）

行，也是成功运行了，这一步完成。

第二步：使用swagger规范一下

步骤一：引入依赖

<dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-spring-boot-starter</artifactId><version>3.0.2</version></dependency>

步骤二.在配置类中加入knife4j的相关配置

这里创建一个包config放置配置类，

创建一个WebConfig配置文件

package com.cetide.init.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;@Configuration
public class WebConfig {@Beanpublic Docket docket(){ApiInfo apiInfo = new ApiInfoBuilder().title("cetide的接口文档").version("2.0").description("cetide的初始项目").build();Docket docket = new Docket(DocumentationType.SWAGGER_2).apiInfo(apiInfo).select()//指定生成接口需要扫描的包.apis(RequestHandlerSelectors.basePackage("com.cetide.init")).paths(PathSelectors.any()).build();return docket;}protected void addResourceHandlers(ResourceHandlerRegistry registry) {registry.addResourceHandler("/doc.html").addResourceLocations("classpath:/META-INF/resources/");registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");}
}

做好扫描包和资源映射也就ok了，这个时候可以启动项目并且打开浏览器，

输入localhost:8080/doc.html#/home (这里要先确认自己的端口号是8080，如果没设置的话默认是8080)

出现了接口文档的话也就成功了

第三步：创建实体类

这里我以用户模块为例，目录新建model包，并创建dto，entity，enums，vo

在entity设计User实体类：

public class User implements Serializable {private long id;private String userAccount;private String userName;@JsonSerialize(using = NullSerializer.class)private String pwd;@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm:ss")private LocalDateTime gmtCreated;@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm:ss")private LocalDateTime gmtModified;private String userAvatar;private String userProfile;public long getId() {return id;}public void setId(long id) {this.id = id;}public String getUserAccount() {return userAccount;}public void setUserAccount(String userAccount) {this.userAccount = userAccount;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}public LocalDateTime getGmtCreated() {return gmtCreated;}public void setGmtCreated(LocalDateTime gmtCreated) {this.gmtCreated = gmtCreated;}public LocalDateTime getGmtModified() {return gmtModified;}public void setGmtModified(LocalDateTime gmtModified) {this.gmtModified = gmtModified;}public String getUserAvatar() {return userAvatar;}public void setUserAvatar(String userAvatar) {this.userAvatar = userAvatar;}public String getUserProfile() {return userProfile;}public void setUserProfile(String userProfile) {this.userProfile = userProfile;}
}

这里就不用lombok了手动getter和setter（主要还是之前遇到一些lombok的问题太过麻烦，虽然lombok方便，但是出点问题有时候也挺麻烦。）

这里也是设置了id，userAccount账号，userName昵称，密码pwd，用户头像avator，用户简介，更新时间，创建时间这些属性。（这些主要还是要在创建数据库表那会设计好有con）

创建完就OK了，至于dto和vo这块可以先放着，等到需要实现具体功能的时候再根据需求设计输入和需要输出的。

创建统一响应类：

public class Result<D> implements Serializable {@JsonProperty("isSuccess")private boolean success = false;private String code;private String message;private D data;public static <T> Result<T> create() {return new Result<T>();}public boolean isSuccess() {return success;}public Result setSuccess(boolean success) {this.success = success;return this;}public String getCode() {return code;}public Result<D> setCode(String code) {this.code = code;return this;}public String getMessage() {return message;}public Result<D> setMessage(String message) {this.message = message;return this;}public D getData() {return data;}public Result<D> setData(D data) {this.data = data;return this;}
}

这里用Result类作为统一响应类，emmmm，网上大多数好像都是这种，大差不差吧。

然后创建好controller，service（service.impl），dao这三层架构