spring boot 初识实例及问题小结

1.项目结构

2.pom.xml

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</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>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>

3.pojo(Phone.java)

public class Phone {
    private Integer id;
    private String name;
    private Double price;
    private String color;
    private String productionDate;

    public Phone() {
        super();
    }

    public Phone(Integer id, String name, Double price, String color, String productionDate) {
        this.id = id;
        this.name = name;
        this.price = price;
        this.color = color;
        this.productionDate = productionDate;
    }

    public Phone(String name, Double price, String color, String productionDate) {
        this.name = name;
        this.price = price;
        this.color = color;
        this.productionDate = productionDate;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public String getProductionDate() {
        return productionDate;
    }

    public void setProductionDate(String productionDate) {
        this.productionDate = productionDate;
    }

    @Override
    public String toString() {
        return "Phone{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", price=" + price +
                ", color='" + color + '\'' +
                ", productionDate='" + productionDate + '\'' +
                '}';
    }
}

4.PhoneDao.java

import com.laola.phone2.pojo.Phone;
import org.springframework.stereotype.Repository;

import java.util.List;
@Repository
public interface PhoneDao {
    List<Phone> finAll();

    void addPhone(Phone phone);

    void updatePhone(Phone phone);

    int deletePhone(Integer id);
}

5.PhoneService.java

import com.laola.phone2.pojo.Phone;


import java.util.List;

public interface PhoneService {
    List<Phone> finAll();

    void addPhone(Phone phone);

    void updatePhone(Phone phone);

    int deletePhone(Integer id);
}

6.PhoneServiceImpl.java

import com.laola.phone2.dao.PhoneDao;
import com.laola.phone2.pojo.Phone;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
@Service
public class PhoneServiceImpl implements  PhoneService{
    @Autowired
    private PhoneDao phoneDao;
    @Override
    public List<Phone> finAll() {
        return phoneDao.finAll();
    }

    @Override
    public void addPhone(Phone phone) {
        phoneDao.addPhone(phone);
    }

    @Override
    public void updatePhone(Phone phone) {
        phoneDao.updatePhone(phone);
    }

    @Override
    public int deletePhone(Integer id) {
        return phoneDao.deletePhone(id);
    }
}

7.PhoneController.java

import com.laola.phone2.pojo.Phone;
import com.laola.phone2.service.PhoneService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

@Controller
public class PhoneController {
    @Autowired
    private PhoneService phoneService;
    @PostMapping(value = "/addPhone")

    public String  addPhone(Phone phone, HttpServletRequest request, HttpServletResponse response,ModelMap map)throws Exception{
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        map.addAttribute("msg","你是个沙子");
        phoneService.addPhone(phone);

        return "index";
    }
    @GetMapping(value = "/finAll")
    @ResponseBody
    public List<Phone> findAll(){
        return phoneService.finAll();
    }
    @PutMapping(value = "updatePhone/{id}")
    @ResponseBody
    public void updatePhone(Phone phone){
        phoneService.updatePhone(phone);
    }
    @DeleteMapping(value = "deletePhone/{id}")
    @ResponseBody
    public int deletePhone(@PathVariable("id") Integer id){
        return phoneService.deletePhone(id);
    }
}

8.PhoneMapper.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.laola.phone2.dao.PhoneDao">
    <sql id="column_list">
        id,name,price,color,production_date
    </sql>
    <select id="finAll" resultType="com.laola.phone2.pojo.Phone">
        select
        <include refid="column_list" />
        from phone
    </select>
    <insert id="addPhone" >
        insert into phone (name,price,color,production_date)
        values (#{name},#{price},#{color},#{productionDate})
    </insert>
    <update id="updatePhone">
        update phone set name=#{name},price=#{price},color=#{color},production_date=#{productionDate}
        where id=#{id}
    </update>

    <delete id="deletePhone">
        delete from phone where id=#{id}
    </delete>
</mapper>

9.index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<label th:text="${msg1}"></label>
</body>
</html>

10.applicatiion.properties

spring.datasource.url=jdbc:mysql://localhost:3306/phone
spring.datasource.username=root
spring.datasource.password=940521
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

mybatis.type-aliases-package=com.laola.phone2.pojo
mybatis.mapper-locations=classpath:mapper/*.xml
#启用驼峰命名
mybatis.configuration.map-underscore-to-camel-case=true 

spring.http.encoding.charset=utf-8

11.说明：这里我只测试如何像jsp那样拿controller的信息，所以就用了一张index.html，其它业务测试用的postman，测试方法如下：

添加对应post请求：

查询对应get请求：

修改对应put请求：

删除对应delete请求：

12.遇到的问题：

     a.springboot启动程序的文件位置最好按照图示放置，这是为了更好的扫描其下的dao,service,controller.

     b.各层的注解如图上所示，尤其与@Autowired关联的@Service和@Repository注解.

     c.注意启动入口的@MapperScan所扫描的dao的位置.

     d.@Conrtoller可以用来跳转页面，结合@Responsebody使用，@RestController用来代替前面两个，但不能作跳转.

     e.未解决的问题，前台url参数传入数据库后乱码，配置my.cnf,设置请求和响应编码，url参数携带指定编码都无效，有那位大神赐教.