springboot-curd基于mybatis项目搭建的示例分析，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
项目结构：
pom.xml文件：
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.2.RELEASE</version> <relativePath/> </parent> <groupId>com.liuyang</groupId> <artifactId>springbootcurd</artifactId> <version>0.0.1-SNAPSHOT</version> <name>springbootcurd</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>2.2.1</version> </dependency> <!-- 测试依赖--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13</version> <scope>test</scope> </dependency> <!-- springboot 分页插件 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.13</version> </dependency> <!-- mysql 驱动 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.25</version> </dependency> <!-- c3p0 数据源 --> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.5</version> </dependency> <!--StringUtils--> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <!--当前这个项目被继承之后，这个不向下传递--> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-commons</artifactId> <version>2.2.3.RELEASE</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
yml
## 数据源配置 spring: ## 热部署配置 devtools: restart: enabled: true # 设置重启的目录，添加目录的文件需要restart additional-paths: src/main/java # 解决项目自动重新编译后接口报404的问题 poll-interval: 3000 quiet-period: 1000 datasource: type: com.mchange.v2.c3p0.ComboPooledDataSource driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://127.0.0.1:3306/springboot_mybatis?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8 username: root password: 123456 ##视图的配置 freemarker: template-loader-path: classpath*:/views/ charset: UTF-8 content-type: text/html cache: false suffix: .ftl ## mybatis 配置 mybatis: #映射文件的存放路径 mapper-locations: classpath*:/mapper/*.xml type-aliases-package: com.liuyang.bean,com.liuyang.vo,com.liuyang.query configuration: ## 下划线转驼峰配置 map-underscore-to-camel-case: true ## pageHelper pagehelper: helper-dialect: mysql ## 显示dao 执行sql语句 logging: level: com: xxxx: mapper: debug
bean
private Integer userId; private String userName; private String userPwd;
mapper
public interface Usermapper {
public User selectuserbyid(Integer id);
public User selectUserByName(String userName);
// 注意返回的类型
public int insertUser(User user);
// 根据id进行删除数据
public int deleteUserById(int userId);
//条件查询
public List<User> selectUserByItem(UserQuery userQuery);
}mapping.xml
<?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.liuyang.mapper.Usermapper">
<select id="selectuserbyid" parameterType="int" resultType="com.liuyang.bean.User">
select * from t_user where user_id=#{userId}
</select>
<select id="selectUserByName" parameterType="String" resultType="com.liuyang.bean.User">
select * from t_user where user_name=#{userName}
select * from t_user where user_name=
</select>
<insert id="insertUser">
insert into t_user(user_name,user_pwd) values(#{userName},#{userPwd});
</insert>
<!--删除一条-->
<delete id="deleteUserById" parameterType="int">
delete from t_user where user_id=#{userId}
</delete>
<!--条件查询-->
<select id="selectUserByItem" resultType="com.liuyang.bean.User">
select * from t_user
<where>
<if test="userName!=null">
user_name like "%${userName}%"
</if>
</where>
</select>
</mapper>controller
@RestController
public class Usercontroller {
@Resource
private Usermapper usermapper;
@GetMapping("one/{id}")
public User sayUser(@PathVariable Integer id) {
System.out.println( id + "<<<" );
//根据ID查询
User user = usermapper.selectuserbyid(id);
return user;
}
// 没有检测重复
@GetMapping("userOne/{name}")
public User sayUserOne(@PathVariable String name) {
System.out.println( name + "<<<" );
//根据ID查询
User user = usermapper.selectUserByName( name );
//user--json
return user;
}
@PutMapping("add")
public int sayAdd(User user) {
System.out.println( user + "<<<" );
//根据ID查询
return usermapper.insertUser( user );
}
@DeleteMapping("delete/{userId}")
public int sayDel(@PathVariable Integer userId) {
System.out.println( userId + "<<<" );
//根据ID查询
return usermapper.deleteUserById( userId );
}
@GetMapping("query")
public java.util.List<User> sayDel(UserQuery userQuery) {
System.out.println( userQuery + "<<<" );
//分页的集合数据
return usermapper.selectUserByItem( userQuery );
}
}query
public class UserQuery {
private Integer pageNum=1;
private Integer pageSize=1;
private String userName;以上只是简单的实现了增删改查 如果发生了插入或者是删除异常，我们就应该会自定义全局异常去捕获出现的问题
新增类 service 主要进行的业务的处理
Userservice
public interface Userservice {
public User queryUserById(Integer userId);
public User queryUserByName(String userName);
public void saveUser(User user);
public void changeUser(User user);
//删除一条
public void removeUserById(Integer userId);
//查询用户信息
public PageInfo<User> queryUserByPage(UserQuery userQuery);
}UserserviceImpl
@Service
public class UserserviceImpl implements Userservice {
@Resource
private Usermapper usermapper;
// 查询都是用的User返回类型
@Override
public User queryUserById(Integer userId) {
return usermapper.selectuserbyid( userId );
}
@Override
public User queryUserByName(String userName) {
return usermapper.selectUserByName( userName );
}
//增加操作
/***
* 需要用户名 AssertUtil
* 用户密码
* 用户是否存在
* 添加用户是否成功
* @param user
*/
@Override
public void saveUser(User user) {
//验证用户名
AssertUtil.isTrue( StringUtils.isBlank(user.getUserName()),"用户名不能为空");
//用户密码
AssertUtil.isTrue(StringUtils.isBlank(user.getUserPwd()),"用户密码不能为空");
//用户是否存在
User temp = usermapper.selectUserByName(user.getUserName());
AssertUtil.isTrue(temp!=null,"用户已经存在");
//用户添加是否成功
AssertUtil.isTrue(usermapper.insertUser(user)<1,"添加失败了");
}
// 修改操作
/****
* 用户名不为空
* 用户密码不为空
* 用户不存在
* 用户修改操作失败
*
* @param user
*/
@Override
public void changeUser(User user) {
AssertUtil.isTrue( StringUtils.isBlank( user.getUserName() ),"用户名不为空" );
AssertUtil.isTrue( StringUtils.isBlank( user.getUserPwd() ),"密码不为空" );
User temp = usermapper.selectuserbyid(user.getUserId());
AssertUtil.isTrue( temp == null,"用户不存在");
AssertUtil.isTrue( usermapper.updateUser(user)<1,"修改失败了");
}
/****
* 删除是的id是否还存在
* 删除失败
* @param userId
*/
@Override
public void removeUserById(Integer userId) {
AssertUtil.isTrue( userId==null|| null==usermapper.selectuserbyid( userId ),"待删除数据不存在" );
AssertUtil.isTrue( usermapper.deleteUserById( userId )<1,"删除失败" );
}
/**
* 分页参数传递了两个变量 一个是起始位置 一个是一页有多行数据
*
* @param userQuery
* @return
*/
@Override
public PageInfo<User> queryUserByPage(UserQuery userQuery) {
PageHelper.startPage( userQuery.getPageNum(),userQuery.getPageSize());
List<User> ulist = usermapper.selectUserByItem( userQuery );
PageInfo<User> plist =new PageInfo<User>(ulist);
return plist;
}
}
新增类 用来校验数据数据是否有误
AssertUtil
public class AssertUtil {
/**
*
* @param flag 参数
* @param msg 信息
* flag=true
* 抛出异常，自定义
*/
public static void isTrue(Boolean flag,String msg){
if(flag){
throw new ParamException(msg);
}
}
}ParamException 自定义异常类
public class ParamException extends RuntimeException{
private Integer code=300;
private String msg="参数异常";
public ParamException() {
super("参数异常");
}
public ParamException(Integer code) {
super("参数异常");
this.code=code;
}
public ParamException(String msg) {
super(msg);
this.msg=msg;
}
public ParamException(Integer code,String msg) {
super(msg);
this.msg=msg;
this.code=code;
}
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
把数据状态码 状态数据存在在Resultinfo所创建的对象中
ResultInfo
public class ResultInfo {
private Integer code=200;
private String msg="操作成功";
private Object object;
public ResultInfo() {
}
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public Object getObject() {
return object;
}
public void setObject(Object object) {
this.object = object;
}
@Override
public String toString() {
return "ResultInfo{" +
"code=" + code +
", msg='" + msg + '\'' +
", object=" + object +
'}';
}
}更新传递的事json数据：
分页查询：
springboot一种全新的编程规范，其设计目的是用来简化新Spring应用的初始搭建以及开发过程，SpringBoot也是一个服务于框架的框架，服务范围是简化配置文件。
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