搭建springboot项目——my12306

新建一个项目

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创建好之后，配置一下之前的maven,用默认的要下载好久

配置文件application.yml

从以前的项目copy过来的，一直用这个当模板，改一下数据库名，用户名，密码

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/my12306?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: 123456

  http:
    encoding.force: true
    encoding.charset: UTF-8
    encoding.enabled: true

mybatis:
  type-aliases-package: com.zx.my12306.domain
  mapper-locations: classpath:mapper/*.xml
  #type-handlers-package: com.zx.his.domain
  config-location: classpath:mybatis-config.xml

server:
  port: 80
  tomcat.uri-encoding: UTF-8

pom.xml 添加jar包和逆向工程插件

注意逆向工程插件的添加位置，一定要在buil标签下

<?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.zx</groupId>
    <artifactId>my12306</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>My12306</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.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>5.1.39</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </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>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>3.4.1</version>
        </dependency>
        <!--log4j-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <!--逆向工程插件-->
            <!--mybatis-generator-->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.5</version>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.39</version>
                    </dependency>
                    <dependency>
                        <groupId>org.mybatis.generator</groupId>
                        <artifactId>mybatis-generator-core</artifactId>
                        <version>1.3.5</version>
                    </dependency>
                </dependencies>
                <executions>
                    <execution>
                        <id>Generate MyBatis Artifacts</id>
                        <phase>package</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <!--允许移动生成的文件 -->
                    <verbose>true</verbose>
                    <!-- 是否覆盖 -->
                    <overwrite>true</overwrite>
                    <!-- 自动生成的配置 -->
                    <configurationFile>
                        src/main/resources/mybatis-generator.xml
                    </configurationFile>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
            <!--mybatis-generator-->
        </plugins>

    </build>

</project>

MySQL创建数据库

 create database my12306;
 
 use my12306;
 
 create table user(
	id int primary key auto_increment,
	loginname varchar(20) not null,
	password varchar(20) not null);

 insert into user values(1,'zx','123456');
 
create table contact(
	id int primary key auto_increment,
	name varchar(20),
	idtype varchar(20),
	idcard varchar(20),
	type varchar(20),
	phone varchar(20),
	userid int not null,
	foreign key(userid) references user(id));

insert into contact values(2,'哎米米','身份证','31010119204163983','学生','13912341234',1);
insert into contact values(1,'陈伟飞','身份证','37010519880414805X','成人','13912341200',1);

配置数据库

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逆向工程配置文件 mybatis-generator.xml（文件名不可修改）

在src/main/resources下添加一个mybatis-generator.xml文件

<?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>
    <context id="myBatis3" targetRuntime="MyBatis3">
        <!-- mergeable 为true时，可合并，为false，重新生成的时采用覆盖-->
        <property name="mergeable" value="false"/>
        <property name="javaFileEncoding" value="UTF-8"/>

        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!--数据库链接地址账号密码-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/my12306" userId="root" password="123456">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!--生成Model类存放位置-->
        <javaModelGenerator targetPackage="com.zx.my12306.domain" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!--生成映射文件存放位置-->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!--生成Dao类存放位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.zx.my12306.dao"
                             targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>

        <table tableName="user" domainObjectName="User" enableCountByExample="false"
               enableUpdateByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" selectByExampleQueryId="false">
            <columnOverride column="id" javaType="Integer"/></table>
        <table tableName="contact" domainObjectName="Contact" enableCountByExample="false"
               enableUpdateByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" selectByExampleQueryId="false">
            <columnOverride column="id" javaType="Integer"/></table>
    </context>
</generatorConfiguration>

运行插件，双击生成代码

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编写代码，实现登录

UserMapper.java
在自动生成的类中加入一个方和注解

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UserMapper.xml
方法名和接口中一致
大括号中参数为user类的属性名

UserSerice.java
自己创建，注意添加注解

UserController.java
自己创建，注意添加注解

结果展示

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编写代码，实现按用户id查询联系人

ContactMapper.java

package com.zx.my12306.dao;

import com.zx.my12306.domain.Contact;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface ContactMapper {
    int deleteByPrimaryKey(Integer id);

    int insert(Contact record);

    int insertSelective(Contact record);

    Contact selectByPrimaryKey(Integer id);

    int updateByPrimaryKeySelective(Contact record);

    int updateByPrimaryKey(Contact record);

//新加的方法 按照用户名查询
    List<Contact> selectByUserId(int id);
}

ContactMapper.xml

 <select id="selectByUserId" parameterType="int" resultType="contact">
    select * from contact where userid=#{id}
  </select>

ContactService.java

package com.zx.my12306.service;

import com.zx.my12306.dao.ContactMapper;
import com.zx.my12306.domain.Contact;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.List;

@Service
@Transactional
public class ContactService {
    @Resource
    ContactMapper contactMapper;

    public List<Contact> getByUserId(int userId){
        return contactMapper.selectByUserId(userId);
    }
}

ContactController.java

package com.zx.my12306.controller;

import com.zx.my12306.domain.Contact;
import com.zx.my12306.service.ContactService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class ContactController {
    @Autowired
    ContactService contactService;

    @RequestMapping("/getcontactByuserid")
    public List<Contact> getByUserId(int userId){
        return contactService.getByUserId(userId);
    }
}

效果
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原文链接：https://blog.csdn.net/HRBU_17042132/article/details/106663777