SpringBoot+Mybatis新手入門
阿新 • • 發佈：2018-11-07
SpringBoot對比於SpringMVC減少了很多配置檔案，在搭建時更加快捷方便，由於內建了tomcat所以直接執行Application不需要在tomcat中執行。
1 在eclipse中新建maven專案，並按以下配置書寫pom.xml
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd" 2 新建如下目錄結構
3 載入完jar包後，新建啟動類application，啟動類必須放在最外層，載入的時候會載入application所在目錄及下級目錄
package com.springboot.SpringBootHello;
import org.apache.log4j.Logger;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
//此註解表示動態掃描DAO介面所在包
@MapperScan("com.springboot.SpringBootHello.dao")
//此註解表示該類啟動類
@SpringBootApplication
public class Application implements EmbeddedServletContainerCustomizer{
private static Logger logger = Logger.getLogger(Application.class);
public static void main(String[] args) {
logger.info("=================開始成功=================");
SpringApplication.run(Application.class, args);
logger.info("=================啟動成功=================");
}
//這裡是程式碼設定埠，也可以在application.properties檔案中配置埠
@Override
public void customize(ConfigurableEmbeddedServletContainer cus) {
// TODO Auto-generated method stub
cus.setPort(8989);
}
}
4 新建controller類，攔截動作
package com.springboot.SpringBootHello.controller;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.springboot.SpringBootHello.model.User;
import com.springboot.SpringBootHello.service.UserService;
//只需使用@Controller 標記一個類是Controller ，然後使用@RequestMapping 和@RequestParam 等一些註解用以定義URL 請求和Controller 方法之間的對映，這樣的Controller 就能被外界訪問到。
@Controller
public class IndexController {
private static Logger logger = Logger.getLogger(IndexController.class);
@RequestMapping("/hello")
@ResponseBody
public String index() {
logger.info("=====進入index=====");
return "hello";
}
} 在瀏覽器中輸入地址：
===========上述操作後SpringBoot搭建的web的demon就好了=============
===============下面將Mybatis整合入SpringBoot中====================
1 首先確認在pom.xml中載入了mybatis及oracle驅動的包。
2 書寫相關配置檔案resource/config/application.propertities
#設定Tomcat埠，預設8080，此處埠也可在程式碼中設定，前文有提示
#server.port=8080
#設定專案ContextPath
server.context-path=/
#設定Tomcat編碼
server.tomcat.uri-encoding=UTF-8
#設定檢視解析器路徑
spring.mvc.view.prefix=/WEB-INF/views/
#設定檢視解析器字尾
spring.mvc.view.suffix=.jsp
#資料庫配置
spring.datasource.url=jdbc:oracle:thin:@localhost:1521:orcl
spring.datasource.username=eastcom
spring.datasource.password=eastcom
spring.datasource.driver-class-name=oracle.jdbc.OracleDriver
#配置.xml檔案
mybatis.mapper-locations=classpath:mappings/*.xml
#配置模型路徑
mybatis.type-aliases-package=com.springboot.SpringBootHello.model3書寫maybatis的mapper檔案/resources/mappings/UserMapper.xml (需在application.propertities中書寫載入的路徑
)
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
<!--對應專案中的dao路徑-->
<mapper namespace="com.springboot.SpringBootHello.dao.UserDao">
<select id="getNameById" parameterType="com.springboot.SpringBootHello.model.User" resultType="com.springboot.SpringBootHello.model.User">
SELECT * FROM user1 WHERE ID = #{id}
</select>
</mapper>4新建UserDao類
package com.springboot.SpringBootHello.dao;
import org.apache.ibatis.annotations.Mapper;
import com.springboot.SpringBootHello.model.User;
//mybatis
@Mapper
public interface UserDao {
public User getNameById(User user);
}
5新建User模型類
package com.springboot.SpringBootHello.model;
public class User {
private String name;
private Integer id;
private Integer age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
6新建服務類
package com.springboot.SpringBootHello.service;
import com.springboot.SpringBootHello.model.User;
public interface UserService {
public User getNameById(User user);
}
7新建實現類
package com.springboot.SpringBootHello.serviceImply;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.springboot.SpringBootHello.dao.UserDao;
import com.springboot.SpringBootHello.model.User;
import com.springboot.SpringBootHello.service.UserService;
@Service
public class UserServiceImply implements UserService{
@Autowired
private UserDao userdao;
@Override
public User getNameById(User user) {
// TODO Auto-generated method stub
return userdao.getNameById(user);
}
}8修改controller
package com.springboot.SpringBootHello.controller;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.springboot.SpringBootHello.model.User;
import com.springboot.SpringBootHello.service.UserService;
@Controller
public class IndexController {
@Autowired
private UserService userService;
private static Logger logger = Logger.getLogger(IndexController.class);
@RequestMapping("/hello")
@ResponseBody
public String index() {
logger.info("=====進入index=====");
return "hello";
}
@RequestMapping("/get")
@ResponseBody
public String get(User user) {
logger.info("=====進入get=====");
User user2=userService.getNameById(user);
return user2.getName()+user2.getId()+user2.getAge();
}
}
結果如圖
注意事項：
配置檔案:
pom.xml (Springboot,web,mybatis,tomcat,oracle等相關依賴)
application.properties和xml的路徑需要在resources下
application.java需要放在最外層
理解以下註解的含義及用法
@MapperScan
@Mapper
@SpringBootApplication
@Autowired
@Service
@RequestMapping(“/”)