<think>根据你的要求，我将为你设计一个
使用SSM（Spring+SpringMVC+MyBatis）框架的简易记事本应用。这个应用将实现基本的增删改查功能。由于代码量较大，我将分步骤进行说明，并提供关键代码。###项目结构```src├──main│├──java││└──com││└──example││└──notebook││├──controller│││└──NoteController.java││├──dao│││└──NoteMapper.java││├──entity│││└──Note.java││├──service│││├──NoteService.java│││└──impl│││└──NoteServiceImpl.java││└──config││└──AppConfig.java
(可选，
使用Java配置类
)│├──resources││├──spring│││├──spring-dao.xml
(MyBatis配置
)│││├──spring-service.xml
(Service层配置
)│││└──spring-mvc.xml
(SpringMVC配置
)││├──mybatis│││└──mapper│││└──NoteMapper.xml││├──jdbc.properties││└──log4j.properties
(日志配置
)│└──webapp│├──WEB-INF││└──web.xml│└──index.jsp```###步骤1.**创建实体类（Note.java）**2.**创建数据访问层（Mapper接口和XML文件）**3.**创建服务层（Service接口和实现类）**4.**创建控制器（Controller）**5.**配置Spring、SpringMVC和MyBatis**6.**创建视图（JSP页面）**###1.实体类（Note.java）```javapackagecom.example.notebook.entity;importjava.util.Date;publicclassNote{privateIntegerid;privateStringtitle;privateStringcontent;privateDatecreateTime;privateDateupdateTime;//省略getter和setter//省略toString}```###2.数据访问层**NoteMapper.java（接口）**```javapackagecom.example.notebook.dao;importcom.example.notebook.entity.Note;importjava.util.List;publicinterfaceNoteMapper{intinsert
(Notenote
);intdeleteById
(Integerid
);intupdate
(Notenote
);NoteselectById
(Integerid
);List<Note>selectAll
();}```**NoteMapper.xml**```xml<?xmlversion="1.0"encoding="UTF-8"?><!DOCTYPEmapperPUBLIC"-//mybatis.org//DTDMapper3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mappernamespace="com.example.notebook.dao.NoteMapper"><resultMapid="BaseResultMap"type="com.example.notebook.entity.Note"><idcolumn="id"property="id"jdbcType="INTEGER"/><resultcolumn="title"property="title"jdbcType="VARCHAR"/><resultcolumn="content"property="content"jdbcType="VARCHAR"/><resultcolumn="create_time"property="createTime"jdbcType="TIMESTAMP"/><resultcolumn="update_time"property="updateTime"jdbcType="TIMESTAMP"/></resultMap><sqlid="Base_Column_List">id,title,content,create_time,update_time</sql><insertid="insert"parameterType="Note"useGeneratedKeys="true"keyProperty="id">INSERTINTOnote
(title,content,create_time,update_time
)VALUES
(#{title},#{content},now
(),now
())</insert><deleteid="deleteById"parameterType="Integer">DELETEFROMnoteWHEREid=#{id}</delete><updateid="update"parameterType="Note">UPDATEnoteSETtitle=#{title},content=#{content},update_time=now
()WHEREid=#{id}</update><selectid="selectById"parameterType="Integer"resultMap="BaseResultMap">SELECT<includerefid="Base_Column_List"/>FROMnoteWHEREid=#{id}</select><selectid="selectAll"resultMap="BaseResultMap">SELECT<includerefid="Base_Column_List"/>FROMnote</select></mapper>```###3.服务层**NoteService.java（接口）**```javapackagecom.example.notebook.service;importcom.example.notebook.entity.Note;importjava.util.List;publicinterfaceNoteService{intaddNote
(Notenote
);intdeleteNote
(Integerid
);intupdateNote
(Notenote
);NotegetNoteById
(Integerid
);List<Note>getAllNotes
();}```**NoteServiceImpl.java（实现类）**```javapackagecom.example.notebook.service.impl;importcom.example.notebook.dao.NoteMapper;importcom.example.notebook.entity.Note;importcom.example.notebook.service.NoteService;importorg.springframework.beans.factory.annotation.Autowired;importorg.springframework.stereotype.Service;importjava.util.List;@ServicepublicclassNoteServiceImplimplementsNoteService{@AutowiredprivateNoteMappernoteMapper;@OverridepublicintaddNote
(Notenote
){returnnoteMapper.insert
(note
);}@OverridepublicintdeleteNote
(Integerid
){returnnoteMapper.deleteById
(id
);}@OverridepublicintupdateNote
(Notenote
){returnnoteMapper.update
(note
);}@OverridepublicNotegetNoteById
(Integerid
){returnnoteMapper.selectById
(id
);}@OverridepublicList<Note>getAllNotes
(){returnnoteMapper.selectAll
();}}```###4.控制器（NoteController.java）```javapackagecom.example.notebook.controller;importcom.example.notebook.entity.Note;importcom.example.notebook.service.NoteService;importorg.springframework.beans.factory.annotation.Autowired;importorg.springframework.stereotype.Controller;importorg.springframework.ui.Model;importorg.springframework.web.bind.annotation.*;importjava.util.List;@Controller@RequestMapping
("/note"
)publicclassNoteController{@AutowiredprivateNoteServicenoteService;@GetMapping
("/list"
)publicStringlistNotes
(Modelmodel
){List<Note>notes=noteService.getAllNotes
();model.addAttribute
("notes",notes
);return"noteList";}@GetMapping
("/add"
)publicStringaddNoteForm
(Modelmodel
){model.addAttribute
("note",newNote
());return"addNote";}@PostMapping
("/add"
)publicStringaddNoteSubmit
(@ModelAttributeNotenote
){noteService.addNote
(note
);return"redirect:/note/list";}@GetMapping
("/edit/{id}"
)publicStringeditNoteForm
(@PathVariableIntegerid,Modelmodel
){Notenote=noteService.getNoteById
(id
);model.addAttribute
("note",note
);return"editNote";}@PostMapping
("/edit"
)publicStringeditNoteSubmit
(@ModelAttributeNotenote
){noteService.updateNote
(note
);return"redirect:/note/list";}@GetMapping
("/delete/{id}"
)publicStringdeleteNote
(@PathVariableIntegerid
){noteService.deleteNote
(id
);return"redirect:/note/list";}}```###5.配置文件**spring-dao.xml（MyBatis配置）**```xml<?xmlversion="1.0"encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><!--配置数据库连接池--><context:property-placeholderlocation="classpath:jdbc.properties"/><beanid="dataSource"class="org.springframework.jdbc.datasource.DriverManagerDataSource"><propertyname="driverClassName"value="${jdbc.driver}"/><propertyname="url"value="${jdbc.url}"/><propertyname="username"value="${jdbc.username}"/><propertyname="password"value="${jdbc.password}"/></bean><!--配置SqlSessionFactory--><beanid="sqlSessionFactory"class="org.mybatis.spring.SqlSessionFactoryBean"><propertyname="dataSource"ref="dataSource"/><propertyname="mapperLocations"value="classpath:mybatis/mapper/*.xml"/></bean><!--配置Mapper扫描器--><beanclass="org.mybatis.spring.mapper.MapperScannerConfigurer"><propertyname="basePackage"value="com.example.notebook.dao"/><propertyname="sqlSessionFactoryBeanName"value="sqlSessionFactory"/></bean></beans>```**spring-service.xml（Service层配置）**```xml<?xmlversion="1.0"encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><!--扫描service包，
使用注解配置--><context:component-scanbase-package="com.example.notebook.service"/></beans>```**spring-mvc.xml（SpringMVC配置）**```xml<?xmlversion="1.0"encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsd"><!--扫描controller包，
使用注解--><context:component-scanbase-package="com.example.notebook.controller"/><!--开启注解驱动--><mvc:annotation-driven/><!--静态资源处理--><mvc:resourcesmapping="/static/**"location="/static/"/><!--视图解析器--><beanclass="org.springframework.web.servlet.view.InternalResourceViewResolver"><propertyname="prefix"value="/WEB-INF/views/"/><propertyname="suffix"value=".jsp"/></bean></beans>```**web.xml**```xml<!DOCTYPEweb-appPUBLIC"-//SunMicrosystems,Inc.//DTDWebApplication2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd"><web-app><display-name>ArchetypeCreatedWebApplication</display-name><!--配置Spring--><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring/spring-*.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!--配置SpringMVC--><servlet><servlet-name>dispatcher</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring/spring-mvc.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>dispatcher</servlet-name><url-pattern>/</url-pattern></servlet-mapping></web-app>```**jdbc.properties**```propertiesjdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/notebook?useUnicode=true&characterEncoding=utf8jdbc.username=rootjdbc.password=123456```###6.视图（JSP页面）**noteList.jsp（列表页面）**```jsp<%@pagecontentType="text/html;charset=UTF-8"language="java"%><%@taglibprefix="c"uri="http://java.sun.com/jsp/jstl/core"%><html><head><title>NoteList</title></head><body><h1>NoteList</h1><tableborder="1"><tr><th>ID</th><th>Title</th><th>Content</th><th>CreateTime</th><th>UpdateTime</th><th>Actions</th></tr><c:
forEachitems="${notes}"var="note"><tr><td>${note.id}</td><td>${note.title}</td><td>${note.content}</td><td>${note.createTime}</td><td>${note.updateTime}</td><td><ahref="/note/edit/${note.id}">Edit</a><ahref="/note/delete/${note.id}">Delete</a></td></tr></c:
forEach></table><ahref="/note/add">AddNote</a></body></html>```**addNote.jsp（添加页面）**```jsp<%@pagecontentType="text/html;charset=UTF-8"language="java"%><html><head><title>AddNote</title></head><body><h1>AddNote</h1><formaction="/note/add"method="post">Title:<inputtype="text"name="title"><br>Content:<textareaname="content"></textarea><br><inputtype="submit"value="Submit"></form></body></html>```**editNote.jsp（编辑页面）**```jsp<%@pagecontentType="text/html;charset=UTF-8"language="java"%><html><head><title>EditNote</title></head><body><h1>EditNote</h1><formaction="/note/edit"method="post"><inputtype="hidden"name="id"value="${note.id}">Title:<inputtype="text"name="title"value="${note.title}"><br>Content:<textareaname="content">${note.content}</textarea><br><inputtype="submit"value="Submit"></form></body></html>```###数据库表结构```sqlCREATETABLE`note`
(`id`int
(11
)NOTNULLAUTO_INCREMENT,`title`varchar
(255
)DEFAULTNULL,`content`text,`create_time`timestampNOTNULLDEFAULTCURRENT_TIMESTAMP,`update_time`timestampNOTNULLDEFAULTCURRENT_TIMESTAMPONUPDATECURRENT_TIMESTAMP,PRIMARYKEY
(`id`
))ENGINE=InnoDBDEFAULTCHARSET=utf8;```###运行说明1.创建数据库`notebook`，并执行上面的建表语句。2.修改`jdbc.properties`中的数据库连接信息。3.将项目部署到Tomcat等Servlet容器中运行。###注意事项-确保所有依赖的jar包已正确引入（Spring、SpringMVC、MyBatis、数据库驱动等）。-配置文件的路径和名称需要与代码中的配置一致。###相关技术点解释-**Spring**：用于管理Bean和依赖注入。-**SpringMVC**：处理Web请求和视图解析。-**MyBatis**：操作数据库的持久层框架。-**JSP**：视图层技术，用于展示数据。###可能遇到的问题1.**数据库连接失败**：检查`jdbc.properties`配置是否正确，数据库服务是否启动。2.**MyBatis映射文件未找到**：检查`spring-dao.xml`中`mapperLocations`的配置路径是否正确。3.**请求404**：检查控制器中的`@RequestMapping`和JSP页面中的链接地址是否匹配。希望这个简易记事本能帮助你理解
SSM框架的基本
使用。如果有任何问题，请随时提问。§§相关问题§§:1.在
SSM框架中，Spring、SpringMVC和MyBatis分别扮演什么角色？2.如何在MyBatis中实现动态SQL？3.Spring中的依赖注入有哪些方式？4.如何优化
SSM框架的性能？</think>### 简易记事本实现（
SSM框架）
#### 1. 项目结构
```
src/
├── main/
│ ├── java/
│ │ └── com/
│ │ └── example/
│ │ ├── controller/ # 控制器
│ │ ├── entity/ # 实体类
│ │ ├── dao/ # 数据访问层
│ │ ├── service/ # 服务层
│ │ └── config/ # 配置类
│ ├── resources/
│ │ ├── mapper/ # MyBatis映射文件
│ │ ├── spring/ # Spring配置
│ │ └── application.properties # 数据库配置
│ └── webapp/
│ ├── WEB-INF/
│ │ └── views/ # JSP视图
│ └── index.jsp
pom.xml # Maven依赖
```
#### 2. 核心代码实现
**实体类
(Note.java
)**
```java
package com.example.entity;
import java.util.Date;
public class Note {
private Integer id;
private String title;
private String content;
private Date createTime;
private Date updateTime;
// 省略getter/setter
}
```
**Mapper接口
(NoteMapper.java
)**
```java
package com.example.dao;
import com.example.entity.Note;
import java.util.List;
public interface NoteMapper {
int insert
(Note note
);
int deleteById
(Integer id
);
int update
(Note note
);
Note selectById
(Integer id
);
List<Note> selectAll
();
}
```
**Mapper映射文件
(NoteMapper.xml
)**
```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.example.dao.NoteMapper">
<insert id="insert" parameterType="Note" useGeneratedKeys="true" keyProperty="id">
INSERT INTO note
(title, content, create_time
)
VALUES
(#{title}, #{content}, now
())
</insert>
<select id="selectById" resultType="Note">
SELECT * FROM note WHERE id = #{id}
</select>
<select id="selectAll" resultType="Note">
SELECT * FROM note ORDER BY create_time DESC
</select>
<update id="update" parameterType="Note">
UPDATE note SET
title = #{title},
content = #{content},
update_time = now
()
WHERE id = #{id}
</update>
<delete id="deleteById">
DELETE FROM note WHERE id = #{id}
</delete>
</mapper>
```
**Service接口
(NoteService.java
)**
```java
package com.example.service;
import com.example.entity.Note;
import java.util.List;
public interface NoteService {
void saveNote
(Note note
);
void deleteNote
(Integer id
);
void updateNote
(Note note
);
Note getNoteById
(Integer id
);
List<Note> getAllNotes
();
}
```
**ServiceImpl实现类**
```java
package com.example.service.impl;
import com.example.dao.NoteMapper;
import com.example.entity.Note;
import com.example.service.NoteService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class NoteServiceImpl implements NoteService {
@Autowired
private NoteMapper noteMapper;
@Override
public void saveNote
(Note note
) {
noteMapper.insert
(note
);
}
@Override
public void deleteNote
(Integer id
) {
noteMapper.deleteById
(id
);
}
@Override
public void updateNote
(Note note
) {
noteMapper.update
(note
);
}
@Override
public Note getNoteById
(Integer id
) {
return noteMapper.selectById
(id
);
}
@Override
public List<Note> getAllNotes
() {
return noteMapper.selectAll
();
}
}
```
**Controller控制器
(NoteController.java
)**
```java
package com.example.controller;
import com.example.entity.Note;
import com.example.service.NoteService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
@Controller
@RequestMapping
("/note"
)
public class NoteController {
@Autowired
private NoteService noteService;
// 显示所有笔记
@GetMapping
("/list"
)
public String listNotes
(Model model
) {
model.addAttribute
("notes", noteService.getAllNotes
());
return "noteList";
}
// 添加笔记表单
@GetMapping
("/add"
)
public String addForm
() {
return "addNote";
}
// 保存笔记
@PostMapping
("/save"
)
public String saveNote
(Note note
) {
noteService.saveNote
(note
);
return "redirect:/note/list";
}
// 编辑笔记
@GetMapping
("/edit/{id}"
)
public String editForm
(@PathVariable Integer id, Model model
) {
model.addAttribute
("note", noteService.getNoteById
(id
));
return "editNote";
}
// 删除笔记
@GetMapping
("/delete/{id}"
)
public String deleteNote
(@PathVariable Integer id
) {
noteService.deleteNote
(id
);
return "redirect:/note/list";
}
}
```
#### 3. 关键配置
**Spring配置
(spring-config.xml
)**
```xml
<!-- 组件扫描 -->
<context:component-scan base-package="com.example" />
<!-- MyBatis配置 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="mapperLocations" value="classpath:mapper/*.xml" />
</bean>
<!-- Mapper扫描 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.example.dao" />
</bean>
<!-- 事务管理 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
```
**数据库配置
(application.properties
)**
```properties
# MySQL配置
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/notebook?useSSL=false&serverTimezone=UTC
jdbc.username=root
jdbc.password=123456
# MyBatis配置
mybatis.type-aliases-package=com.example.entity
```
#### 4. 视图层（JSP示例）
**noteList.jsp**
```jsp
<%@ page contentType="text/html;charset=UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>笔记列表</title>
</head>
<body>
<h1>我的笔记</h1>
<a href="/note/add">添加新笔记</a>
<table border="1">
<tr>
<th>ID</th>
<th>标题</th>
<th>创建时间</th>
<th>操作</th>
</tr>
<c:
forEach items="${notes}" var="note">
<tr>
<td>${note.id}</td>
<td>${note.title}</td>
<td>${note.createTime}</td>
<td>
<a href="/note/edit/${note.id}">编辑</a>
<a href="/note/delete/${note.id}">删除</a>
</td>
</tr>
</c:
forEach>
</table>
</body>
</html>
```
#### 5. 数据库表结构
```sql
CREATE TABLE `note`
(
`id` INT AUTO_INCREMENT PRIMARY KEY,
`title` VARCHAR
(100
) NOT NULL,
`content` TEXT NOT NULL,
`create_time` DATETIME DEFAULT CURRENT_TIMESTAMP,
`update_time` DATETIME ON UPDATE CURRENT_TIMESTAMP
);
```
### 实现要点说明
1. **分层架构**：
- Controller：处理HTTP请求，调用Service
- Service：业务逻辑层，处理核心功能
- DAO/Mapper：数据库操作层
- Entity：数据模型
2. **依赖注入**：
-
使用`@Autowired`实现Service和Mapper的自动装配
- 通过Spring的IoC容器管理Bean生命周期
3. **事务管理**：
-
使用`DataSourceTransactionManager`声明式事务管理
- 默认在Service层方法上开启事务
4. **RESTful设计**：
-
使用`@GetMapping`/`@PostMapping`区分请求类型
- 路径变量`@PathVariable`获取资源ID
5. **MyBatis优化**：
- `useGeneratedKeys`获取自增主键
- 动态SQL处理
复杂查询（示例未展示）
### 常见问题解决
**问题1：数据库连接失败**
- **原因**：配置错误或驱动不匹配
- **解决**：
```properties
#
使用正确驱动类
jdbc.driver=com.mysql.cj.jdbc.Driver
# 添加时区参数
jdbc.url=jdbc:mysql://localhost:3306/db?serverTimezone=UTC
```
**问题2：404页面未找到**
- **原因**：
- 控制器扫描未配置
- 视图解析器路径错误
- **解决**：
```xml
<!-- 在spring-mvc.xml中添加 -->
<mvc:annotation-driven />
<context:component-scan base-package="com.example.controller" />
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
```
**问题3：MyBatis映射失效**
- **原因**：
- XML文件未扫描到
- 命名空间与接口不匹配
- **解决**：
```xml
<!-- 确保正确配置mapper位置 -->
<property name="mapperLocations" value="classpath:mapper/*.xml" />
```
### 运行流程
1. 用户访问 `/note/list` 显示笔记列表
2. 点击"添加"跳转到表单页面
3. 提交表单保存到数据库
4. 编辑/删除操作通过ID定位记录
5. 数据变更后重定向到列表页
### 技术栈说明
- **Spring**：IoC容器管理和事务控制
- **SpringMVC**：请求分发和视图解析
- **MyBatis**：SQL映射和结果集转换
- **MySQL**：数据持久化存储
- **JSP/JSTL**：视图层数据展示
本文深入探讨了MyBatis框架中的高级特性，包括foreach循环的使用，choose、when、otherwise语句的逻辑控制，以及如何处理不同类型的输入参数，如数组、列表和Map，通过具体示例展示了如何构建动态SQL查询。
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