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
@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
@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");
}
@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" );
}
@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 {
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：
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