springboot系列四：springboot整合mybatis jsp

一.用IDEA 创建maven项目

项目目录结构

　

1.添加pom jar依赖

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.1.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.aibabelx</groupId>
    <artifactId>springboot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot</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-web</artifactId>
        </dependency>

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

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!-- 添加servlet依赖模块 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>

        </dependency>
        <!-- 添加jstl标签库依赖模块 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!--添加tomcat依赖模块.-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>

        </dependency>
        <!-- 使用jsp引擎，springboot内置tomcat没有此依赖 -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <version>9.0.13</version>

        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>

    </dependencies>

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

</project>

２.创建ｊａｖａｂｅａｎ

　

package com.aibabelx.entity;

public class Student {

    private  String xh;
    private  String xm;
    private  double fs;

    public String getXh() {
        return xh;
    }

    public void setXh(String xh) {
        this.xh = xh;
    }

    public String getXm() {
        return xm;
    }

    public void setXm(String xm) {
        this.xm = xm;
    }

    public double getFs() {
        return fs;
    }

    public void setFs(double fs) {
        this.fs = fs;
    }

    @Override
    public String toString() {
        return "Student{" +
                "xh='" + xh + '\'' +
                ", xm='" + xm + '\'' +
                ", fs=" + fs +
                '}';
    }
}

３.ｍａｐｐｅｒ接口

package com.aibabelx.mapper;

import com.aibabelx.entity.Student;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface StudentMapper {

    public  Integer getSum();

    public List<Student> getMax();

    public List<Student> getSax();
}

４.ｓｅｒｖｉｅ接口

package com.aibabelx.service;

import com.aibabelx.entity.Student;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public interface StudentService {

    public  Integer getSum();

    public List<Student> getMax();

    public List<Student> getSax();
}

５.ｓｅｒｖｉｃｅ的实现类

package com.aibabelx.service.impl;

import com.aibabelx.entity.Student;
import com.aibabelx.mapper.StudentMapper;
import com.aibabelx.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
@Transactional
public class StudentServiceImpl implements StudentService {

    @Autowired
    public StudentMapper studentMapper;
    @Override
    public Integer getSum() {
        return studentMapper.getSum();
    }

    @Override
    public List<Student> getMax() {
        return studentMapper.getMax();
    }

    @Override
    public List<Student> getSax() {
        return studentMapper.getSax();
    }
}

６.ｃｏｎｔｒｏｌｌｅｒ　

package com.aibabelx.controller;

import com.aibabelx.entity.Student;
import com.aibabelx.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import java.util.List;

@Controller
public class IndexController {

    @Autowired
    public StudentService studentService ;
    @RequestMapping("/index")
    public ModelAndView index(){
       Integer n=studentService.getSum();
        List<Student> max=studentService.getMax();
        List<Student> sax=studentService.getSax();

        return  new ModelAndView("index.jsp")
                .addObject("n",n)
                .addObject("max",max)
                .addObject("sax",sax);
    }
}

７．ｍａｐｐｅｒ．ｘｍｌ　文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.aibabelx.mapper.StudentMapper">

    <!-- 通用查询映射结果 -->
    <resultMap id="ItemBaseResultMap" type="com.aibabelx.entity.Student">
        <id column="xh" property="xh" />
        <result column="xm" property="xm" />
        <result column="fs" property="fs" />

    </resultMap>

    <select id="getSum" resultType="Integer" >
        SELECT  COUNT(xh)
        FROM Student

    </select>
    <select id="getMax" resultType="Student">
        SELECT xh,xm,fs from student WHERE fs =(SELECT MAX(fs) from student)

    </select>
    <select id="getSax" resultType="Student">
        SELECT xh,xm,fs from student WHERE fs =(SELECT min(fs) from student)

    </select>

</mapper>

８.配置文件

server.port =9999
spring.http.encoding.force=true
spring.http.encoding.charset=UTF-8
spring.http.encoding.enabled=true
server.tomcat.uri-encoding=UTF-8
#jsp config
spring.mvc.view.prefix=/WEB-INF/views/
#spring.mvc.view.suffix: .jsp

# DataSource
spring.datasource.url=jdbc:mysql://localhost/aiplay?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.show-sql = true

mybatis.mapper-locations=classpath*:mapper/*.xml
mybatis.type-aliases-package=com.aibabelx.entity

９.ｉｎｄｅｘ．ｊｓｐ　文件

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
</head>

<body>

${n}

<c:forEach items="${max}" var="student" >
    ${student.xh}<br>  ${student.xm}<br>  ${student.fs}<br>
</c:forEach>

<c:forEach items="${sax}" var="student" >
    ${student.xh}<br>  ${student.xm}<br>  ${student.fs}<br>
</c:forEach>

</body>
</html>