SpringBoot（五）Springmvc+Mybatis+mysql

爲了整合這個花了，好長時間，由於上幾個連在一塊兒，在pom文件中有沒註釋的配置，致使我找這個問題找了很久。下面開始

1,先new project 時選擇spring initializr，新建好一個空項目後，先在pom文件中配置springmvc+mybatis+mysql（有註解的是我新加的，沒註解的是項目原有的）

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.oda</groupId>
    <artifactId>e-commerce</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>e-commerce</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- 內嵌Tomcat使用 jsp 必要引入 -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>

        <!--  Mybatis引入 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!--  Mysql引入 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--  jstl標籤引入 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

2.配置aplication.properties文件

server.port=8080 #SpringMvc配置視圖 spring.mvc.view.prefix=/WEB-INF/views/ spring.mvc.view.suffix=.jsp spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.url=jdbc:mysql://localhost:3306/test1?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root spring.datasource.password=root mybatis.mapper-locations=classpath:sql/*.xml

3新建.UserController

package com.oda.controller; import com.oda.service.UserService; import org.apache.catalina.LifecycleState; import org.apache.catalina.User; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import javax.annotation.Resource; import java.util.List; @Controller public class UserController { @Resource private UserService userService; @RequestMapping("/welcome") public String index(Model model){ List<User> users = userService.selectUsers(); model.addAttribute("users",users); return "welcome"; } }

4.新建UserService

package com.oda.service; import com.oda.dao.UserDao; import org.apache.catalina.User; import org.springframework.stereotype.Service; import javax.annotation.Resource; import java.util.List; @Service public class UserService { @Resource private UserDao userDao; public List<User> selectUsers() { return userDao.selectUsers(); } }

5.新建UserDao

package com.oda.dao; import org.apache.catalina.User; import org.springframework.stereotype.Repository; import java.util.List; @Repository public interface UserDao { List<User> selectUsers(); }

6.新建User

package com.oda.model; import org.springframework.stereotype.Component; @Component public class User { private int id; private String name; private int age; public User() { } public User(int id, String name, int age) { this.id = id; this.name = name; this.age = age; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}'; } }

7.新建use.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.oda.dao.UserDao">
    <select id="selectUsers" resultType="com.oda.model.User"> select * from user </select>
</mapper>

8.新建welcome.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<head>
    <title></title>
</head>
<body>
<h1>This is a springmvc   ${message}</h1>
<table border="1px">
    <tr>
        <td>序號</td>
        <td>姓名</td>
        <td>年齡</td>
    </tr>
    <c:forEach items="${users}" var="u">
        <tr>
            <td>${u.id}</td>
            <td>${u.name}</td>
            <td>${u.age}</td>
        </tr>
    </c:forEach>
</table>
</body>
</html>

注意要改一下本身的Application類

package com.oda; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication @MapperScan("com.oda.dao") public class ECommerceApplication { public static void main(String[] args) { SpringApplication.run(ECommerceApplication.class, args); } }

這就建好了，啓動，訪問http://localhost:8080/welcome

結果：

項目結構：