目錄
四、將application.properties改成yml文件,並且配置相關參數
整個項目結構預覽
一、通過Spring Initializr創建項目
如圖創建項目 | |
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完成後項目結構如下 |
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完善項目目錄結構如下 | |
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二、修改pom.xml文件
pom.xml文件我們需要將mysql驅動指定一個具體的版本,並且在最後添加mybatis逆向生成插件,完整內容如下
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com</groupId>
<artifactId>hedong</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>hedong</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</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>2.1.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.29</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.8</version>
</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>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.6</version>
<configuration>
<!-- mybatis用於生成代碼的配置文件 -->
<configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
<dependencies>
<!-- 逆向生成生成代碼所要使用的數據庫驅動 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.29</version>
</dependency>
<!-- mybatis 逆向生成工具 -->
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.6</version>
<scope>compile</scope>
<optional>true</optional>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
</project>
三、數據庫準備
在MySQL中創建一個名爲db_ssmdemo數據庫,並創建一張user_tb表,往表中添加一條數據
DROP TABLE IF EXISTS `user_tb`;
CREATE TABLE `user_tb` (
`userid` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(255) DEFAULT NULL,
`password` varchar(255) DEFAULT NULL,
PRIMARY KEY (`userid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
四、將application.properties改成yml文件,並且配置相關參數
application.yml
spring:
# freemarker 配置
freemarker:
template-loader-path: classpath:/templates/
cache: false
charset: utf-8
check-template-location: true
content-type: text/html
expose-request-attributes: false
expose-session-attributes: false
request-context-attribute: request
suffix: .ftl
# mysql 數據源
datasource:
url: jdbc:mysql://localhost/db_ssmdemo?useUnicode=true&characterEncoding=UTF-8
username: root
password: hd2503652646.
driverClassName: com.mysql.jdbc.Driver
mybatis:
mapper-locations: classpath:/mapper/*.xml
type-aliases-package: com.hedong.model
五、配置generatorConfig.xml
在resources目錄下創建generatorConfig.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!-- 數據庫驅動-->
<!-- 因爲使用的maven方式讓MyBatis Generator生成代碼,所以不需要classPathEntry標籤,-->
<!-- <classPathEntry location="mysql-connector-java-5.1.25-bin.jar"/> -->
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<!-- 是否去除自動生成的註釋 true:是 : false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--數據庫鏈接URL,用戶名、密碼 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/數據庫名" userId="數據庫賬號" password="數據庫密碼">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型的包名和位置-->
<javaModelGenerator targetPackage="com.hedong.model" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- 生成映射文件的包名和位置-->
<sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!-- 生成DAO的包名和位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.hedong.dao" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!-- 要生成的表 tableName是數據庫中的表名或視圖名 domainObjectName是實體類名
enableInsert(默認true):指定是否生成insert語句;
enableSelectByPrimaryKey(默認true):指定是否生成按照主鍵查詢對象的語句(就是getById或get);
enableSelectByExample(默認true):MyBatis3Simple爲false,指定是否生成動態查詢語句;
enableUpdateByPrimaryKey(默認true):指定是否生成按照主鍵修改對象的語句(即update);
enableDeleteByPrimaryKey(默認true):指定是否生成按照主鍵刪除對象的語句(即delete);
enableDeleteByExample(默認true):MyBatis3Simple爲false,指定是否生成動態刪除語句;
enableCountByExample(默認true):MyBatis3Simple爲false,指定是否生成動態查詢總條數語句(用於分頁的總條數查詢);
enableUpdateByExample(默認true):MyBatis3Simple爲false,指定是否生成動態修改語句(只修改對象中不爲空的屬性);
-->
<table tableName="user_tb" domainObjectName="User"></table>
</context>
</generatorConfiguration>
六、逆向生成Model實體以及映射文件
第一步:如圖點擊右上角Edit Configuration,在彈出的界面中點擊左上角+號,並在下拉框中選擇Maven。在新彈出的界面中輸入指令:mybatis-generator:generate -e -e的目的是爲了輸入log,最後Apply→OK | |
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第二步:點擊如圖三角形,注意左邊顯示的是剛剛的配置。稍等片刻,界面下方出現 BUILD SUCCESS。代表生成成功。 | |
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第三步:此時可以看到目錄下已經生成了相關代碼以及配置文件 | |
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七、完成controller、service以及頁面代碼
UserController.java
package com.hedong.controller;
import com.hedong.model.User;
import com.hedong.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
//在controller類中加註釋,表明這是控制類,且設置請求路徑
@Controller
@EnableAutoConfiguration //自動配置,不需要寫spring的配置文件
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/getUser")
public String getUser(Model model){
User user=userService.getUser(1);
model.addAttribute("user",user);
return "user";//返回頁面
}
}
UserService.java
package com.hedong.service;
import com.hedong.model.User;
public interface UserService {
//查詢用戶
User getUser(int id);
}
UserServiceImpl.java
package com.hedong.service.impl;
import com.hedong.dao.UserMapper;
import com.hedong.model.User;
import com.hedong.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
//需要加Service註解表示是服務類
// 以及Transactional註解處理事務
@Service
@Transactional(rollbackFor = Exception.class)
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userDao;
@Override
public User getUser(int id) {
return userDao.selectByPrimaryKey(id);
}
}
在templates目錄下創建一個html文件,然後修改爲user.ftl文件
user.ftl
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
賬號:${user.username}<br/>
密碼:${user.password}
</body>
</html>
八、啓動
在啓動之前打開xxxApplication.java文件,添加@MapperScan("com.hedong.dao"),如下
HedongApplication.java
package com.hedong;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@MapperScan("com.hedong.dao")
@SpringBootApplication
public class HedongApplication {
public static void main(String[] args) {
SpringApplication.run(HedongApplication.class, args);
}
}
右上角切換到啓動程序,點擊三角形啓動
瀏覽器輸入地址,測試結果
至此,Spring Boot +Mybatis+freemarker整合完畢!