idea2023 springboot2.7.5+mybatis+jsp 初学单表增删改查
- 创建项目
因为2.7.14使用量较少，特更改spring-boot为2.7.5版本
配置端口号
打开Sm01Application类，右键运行启动项目，或者按照如下箭头启动
启动后，控制台提示如下信息表示成功
此刻在浏览器中输入：http://localhost:8081/hello 就可以看到如下得效果，就表示你成功了。
- 加入mybatis
2.1在pom中加入，如下依赖
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<version>1.18.20version>
dependency>
<dependency>
<groupId>jstlgroupId>
<artifactId>jstlartifactId>
<version>1.2version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>8.0.33version>
dependency>
<dependency>
<groupId>org.mybatis.spring.bootgroupId>
<artifactId>mybatis-spring-boot-starterartifactId>
<version>2.2.2version>
dependency>
2.2在application.properties中增加如下配置
spring.datasource.url=jdbc:mysql://localhost:3306/jdbc08
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
mybatis.mapper-locations=classpath:mapper/*.xml
2.3 在resources 下创建一个文件夹叫mapper
2.4在src下创建bean层，
@Data
public class DeptBean {
private int did;
private String dname;
}
2.5在src下创建mapper层，并写接口
@Mapper
public interface DeptMapper {
public void addDept(String name);
public void delDept(int id);
public void updateDept(DeptBean deptBean);
public DeptBean byidDept(int id);
public List<DeptBean> allDept();
}
2.6 在resource下得mapper文件夹中新建一个文件DeptMapper.xml，如下得com.example.sm_01是项目中的包名
如下请注意：namespace的路径为2.5步中类的全路径
DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.sm_01.mapper.DeptMapper">
<insert id="addDept" >
insert into tb_dept (dname) values (#{values})
insert>
<delete id="delDept">
delete from tb_dept where did=${id}
delete>
<update id="updateDept" parameterType="com.example.sm_01.bean.DeptBean">
update tb_dept set dname=#{dname} where did=#{did}
update>
<select id="byidDept" resultType="com.example.sm_01.bean.DeptBean">
select * from tb_dept where did=#{id}
select>
<select id="allDept" resultType="com.example.sm_01.bean.DeptBean">
select * from tb_dept
select>
mapper>
2.7在src下创建service层，创建如下类
@Service
public class DeptService {
@Autowired
private DeptMapper deptMapper;
public void addDeptService(String name){
deptMapper.addDept(name);
}
public void delDeptService(int id){
deptMapper.delDept(id);
}
public void updateDeptService(DeptBean deptBean){
deptMapper.updateDept(deptBean);
}
public DeptBean byidDeptService(int id){
return deptMapper.byidDept(id);
}
public List<DeptBean> allDeptService(){
return deptMapper.allDept();
}
}
2.8在src下创建controller层，并创建如下类：
@Controller
public class DeptController {
@Autowired
private DeptService deptService;
@RequestMapping("addDept")
public String addDept(String dname){
deptService.addDeptService(dname);
return "allDept";
}
@RequestMapping("allDept")
public String allDept(Model model){
model.addAttribute("alldept",deptService.allDeptService());
return "deptAll.jsp";
}
@RequestMapping("byidDept")
public String byidDept(int id ,Model model){
model.addAttribute("byidDept",deptService.byidDeptService(id));
return "deptUpdate.jsp";
}
@RequestMapping("delDept")
public String delDept(int id){
deptService.delDeptService(id);
return "allDept";
}
@RequestMapping("updateDept")
public String updateDept(DeptBean deptBean){
deptService.updateDeptService(deptBean);
return "allDept";
}
}
如上操作后：代码目录如下：
接下来我们创建jsp目录：
2.9 点击File -->project stru…
然后就看到webapps目录一个小篮圈，然后请在这个目录下新建jsp
若是这里jsp访问404，则请将weapps目录修改为webapp
deptAdd.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Titletitle>
head>
<body>
<form action="addDept" method="post">
部门名称：<input type="text" name="dname" />
<input type="submit" value="添加">
form>
body>
html>
deptAll.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>Titletitle>
head>
<body>
<c:forEach items="${alldept}" var="dd">
${dd.dname}
<a href="delDept?id=${dd.did}">dela>
<a href="byidDept?id=${dd.did}">updatea>
<br/>
c:forEach>
body>
html>
deptUpdate.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Titletitle>
head>
<body>
<form action="updateDept" method="post">
<input type="hidden" name="did" value="${byidDept.did}">
部门名称：<input type="text" name="dname" value="${byidDept.dname}"/>
<input type="submit" value="修改">
form>
body>
html>
如上已完成，若想下载完整代码，请去资源寻找