SpringMVC 学习（八）整合SSM

10. 整合 SSM

(1) 新建数据库

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CREATE DATABASE `SSM`;USE `SSM`;DROP TABLE IF EXISTS `BOOKS`;CREATE TABLE `BOOKS` (`BOOK_ID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书ID',`BOOK_NAME` VARCHAR(100) NOT NULL COMMENT '书名',`BOOK_COUNTS` INT(11) NOT NULL COMMENT '数量',`DETAIL` VARCHAR(200) NOT NULL COMMENT '描述',KEY `BOOK_ID` (`BOOK_ID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8INSERT  INTO `BOOKS`(`BOOK_ID`,`BOOK_NAME`,`BOOK_COUNTS`,`DETAIL`)VALUES 
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');

(2) 新建 maven 项目

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1) 导入依赖

<!--依赖-->
<dependencies><!--junit : 单元测试--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version><scope>test</scope></dependency><!--数据库连接驱动 : java 连接 mysql--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.26</version></dependency><!--c3p0 : 数据库连接池，避免重复连接数据库，缓冲作用--><dependency><groupId>com.mchange</groupId><artifactId>c3p0</artifactId><version>0.9.5.5</version></dependency><!--servlet-api : servlet 编写编译支持--><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>4.0.1</version><!--仅开发时使用，不进行打包处理--><scope>provided</scope></dependency><!--jsp-api : jsp 编译支持--><dependency><groupId>javax.servlet.jsp</groupId><artifactId>javax.servlet.jsp-api</artifactId><version>2.3.3</version><scope>provided</scope></dependency><!--jstl : JSP 标准标签库--><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><!--mybatis --><!--mybatis 标准库--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.7</version></dependency><!--spring 整合 mybatis--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.6</version></dependency><!--spring--><!--Spring MVC 支持--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.3.9</version></dependency><!--jdbc : 连接、请求数据库，处理返回结果--><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.3.9</version></dependency><!--lombok : 偷懒神器--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.20</version></dependency></dependencies>

2) 静态资源过滤

<!--静态资源导出问题-->
<build><resources><resource><directory>src/main/java</directory><includes><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource><resource><directory>src/main/resources</directory><includes><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource></resources>
</build>

(3) IDEA 连接数据库

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(4) Spring 整合 Mybatis

1) 新建包结构

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2) 新建配置文件

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● spring

配置文件名称 : applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>

● 创建 spring 应用上下文

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应用上下文关联了所有的 spring 配置文件，最好保证所有的配置文件都在其中。

● mybatis

配置文件名 : mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
</configuration>

3) 新建实体类

● 开启驼峰命名自动映射

配置路径：resources/com/why/dao/ mybatis-config.xml

<settings><!--开启驼峰命名的自动映射--><setting name="mapUnderscoreToCamelCase" value="true"/><!--开启标准日志--><!--<setting name="logImpl" value="STDOUT_LOGGING"/>-->
</settings>

● 开启别名映射

配置路径：resources/com/why/dao/ mybatis-config.xml

<!--别名-->
<typeAliases><!--扫描包--><package name="com.why.pojo"/>
</typeAliases>

● 编写实体类

package com.why.pojo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;/*** TODO* Books 实体类* @author why* @since 2021/9/16 10:59*/
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Books {private Integer bookId;private String bookName;private Integer bookCounts;private String detail;}

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4) 新建映射器接口

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package com.why.dao;import com.why.pojo.Books;
import org.apache.ibatis.annotations.Param;import java.util.List;/*** TODO* Book 映射器* @author why* @since 2021/9/16 13:20*/
public interface BookMapper {/*** 增加一本书* @param book Books 对象* @return Integer 结果*/Integer addBook(Books book);/*** 根据书 ID 删除一本书* @param id 书 ID* @return Integer 结果*/Integer deleteBookById(@Param("bookId") Integer id);/*** 更新一本书* @param book Books 对象* @return Integer 结果*/Integer updateBook(Books book);/*** 根据书 ID 查询一本书* @param id 书 ID* @return Books 结果*/Books queryBookById(@Param("bookId") Integer id);/*** 查询全部书* @return List 结果*/List<Books> queryAllBook();}

5) 新建映射器 `xml`

● 文件路径

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● 文件内容

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.why.dao.BookMapper"><insert id="addBook" parameterType="Books">insert into ssm.books (BOOK_NAME, BOOK_COUNTS, DETAIL) values (#{bookName}, #{bookCounts}, #{detail});</insert><!--int 会自动转换为 Intager，_int 才是 int--><delete id="deleteBookById" parameterType="int">delete from ssm.books where BOOK_ID = #{bookId};</delete><update id="updateBook" parameterType="Books">update ssm.booksset BOOK_NAME = #{bookName}, BOOK_COUNTS = #{bookCounts}, DETAIL = #{detail}where BOOK_ID = #{bookId};</update><select id="queryBookById" resultType="Books">select * from ssm.books where BOOK_ID = #{bookId};</select><select id="queryAllBook" resultType="Books">select * from ssm.books;</select></mapper>

6) 注册映射器接口

注册路径：resources/com/why/dao/ mybatis-config.xml

<mappers><mapper class="com.why.dao.BookMapper"/>
</mappers>

7) 编写服务层

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● 服务接口

package com.why.service;import com.why.pojo.Books;import java.util.List;/*** TODO* Book 服务接口* @author why* @since 2021/9/16 14:03*/
public interface BookService {/*** 增加一本书* @param book Books 对象* @return Integer 结果*/Integer addBook(Books book);/*** 根据书 ID 删除一本书* @param id 书 ID* @return Integer 结果*/Integer deleteBookById(Integer id);/*** 更新一本书* @param book Books 对象* @return Integer 结果*/Integer updateBook(Books book);/*** 根据书 ID 查询一本书* @param id 书 ID* @return Books 结果*/Books queryBookById(Integer id);/*** 查询全部书* @return List 结果*/List<Books> queryAllBook();}

● 服务实现类

package com.why.service.Impl;import com.why.dao.BookMapper;
import com.why.pojo.Books;
import com.why.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;/*** TODO* Book 服务实现类* @author why* @since 2021/9/16 14:05*/
public class BookServiceImpl implements BookService {private BookMapper bookMapper;public void setBookMapper(BookMapper bookMapper) {this.bookMapper = bookMapper;}public Integer addBook(Books book) {return bookMapper.addBook(book);}public Integer deleteBookById(Integer id) {return bookMapper.deleteBookById(id);}public Integer updateBook(Books book) {return bookMapper.updateBook(book);}public Books queryBookById(Integer id) {return bookMapper.queryBookById(id);}public List<Books> queryAllBook() {return bookMapper.queryAllBook();}}

8) spring 整合 dao 层

● 编写数据库配置文件

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jdbc.driver=com.mysql.jdbc.Driver
# MySQL 8.0+ 需配置时区：&serverTimezone=Asia/Shanghai
jdbc.url=jdbc:mysql://localhost:3306/ssm?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=981030

● 新建 spring 配置文件

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd"></beans>

● 加入到 spring 应用上下文

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● 关联数据库配置文件

引入 context 约束

xmlns:context="http://www.springframework.org/schema/context"
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd

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此处也可用 IDEA 自动引入，但引入的为 c 空间和 p 空间约束，编写代码无提示。

配置数据库配置文件路径
```

<context:property-placeholder location="classpath:database.properties"/>
```

● 配置数据库连接池

<!--2. 配置数据库连接池-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="${jdbc.driver}"/><property name="jdbcUrl" value="${jdbc.url}"/><property name="user" value="${jdbc.username}"/><property name="password" value="${jdbc.password}"/><!-- c3p0连接池的私有属性 --><property name="maxPoolSize" value="30"/><property name="minPoolSize" value="10"/><!-- 关闭连接后不自动commit --><property name="autoCommitOnClose" value="false"/><!-- 获取连接超时时间 --><property name="checkoutTimeout" value="10000"/><!-- 当获取连接失败重试次数 --><property name="acquireRetryAttempts" value="2"/>
</bean>

● 创建 sqlSessionFactory

<!--3. 创建 sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><!--关联数据源--><property name="dataSource" ref="dataSource"/><!--关联 mybatis 配置文件--><property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>

● 配置 dao 层映射器扫描包

此处配置可理解为由 Spring 完成 Mybatis 中 getSqlSession 操作

<!--4. 配置 dao 接口扫描包，动态地将 dao 接口注册进入 spring 容器-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><!--注入 sqlSessionFactory--><property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/><!--配置 dao 包路径--><property name="basePackage" value="com.why.dao"/>
</bean>

● 引入到 `applicationContext.xml`

引入路径：resources/ applicationContext.xml

<import resource="classpath:spring-dao.xml"/>

9) spring 整合 service 层

● 新建 spring 配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd"></beans>

● 将配置文件加入到 spring 上下文

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● 扫描 service 包

<!--1. 扫描 service 包-->
<context:component-scan base-package="com.why.service"/>

● 将业务类注入到 spring 容器

<!--2. 将业务类注入到 spring 容器BookServiceImpl.bookMapper 必须有 set 方法BookService.bookMapper 在 spring-dao.xml 中扫描 dao 包时注入到 spring 中了
-->
<bean id="bookMapperImpl" class="com.why.service.impl.BookServiceImpl"><property name="bookMapper" ref="bookMapper"/>
</bean>

//注解实现：
@Service
public class BookServiceImpl implements BookService {@Autowiredprivate BookMapper bookMapper;...
}

● 声明式事务配置

<!--3. 声明式事务配置-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><!--注入数据源--><property name="dataSource" ref="dataSource"/>
</bean>

● 引入到 `applicationContext.xml`

引入路径：resources/ applicationContext.xml

10) 测试

<import resource="classpath:spring-service.xml"/>

● 新建测试类

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package com.why;import com.why.pojo.Books;
import com.why.service.BookService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import java.util.List;/*** TODO* 测试类* @author why* @since 2021/9/16 20:12*/
public class MyTest {@Testpublic void testAllBooks() {ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");System.out.println(context);BookService bookService = (BookService) context.getBean("bookServiceImpl");System.out.println(bookService);List<Books> books = bookService.queryAllBook();for (Books book : books) {System.out.println(book);}}
}

● 运行测试函数

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Mybatis 整合完毕！！！

(5) 整合 Spring MVC

1) 添加 web 支持

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2) 新建 Spring MVC 配置文件

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd"></beans>

● 引入 mvc 约束

xmlns:mvc="http://www.springframework.org/schema/mvc"
...
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd

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● 引入 context 约束

xmlns:context="http://www.springframework.org/schema/context"
...
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd

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● 注解驱动

<!--1. 注解驱动-->
<mvc:annotation-driven/>

● 静态资源过滤

<!--2. 静态资源过滤-->
<mvc:default-servlet-handler/>

● 扫描 `controller` 包

<!--3. 扫描包-->
<context:component-scan base-package="com.why.controller"/>

● 视图解析器

<!--4. 视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/jsp/"/><property name="suffix" value=".jsp"/>
</bean>

● 引入到 `applicationContext.xml`

引入路径：resources/ `applicationContext.xml

<import resource="classpath:spring-mvc.xml"/>

3) 编写 `web.xml`

● 注册 DispatcherServlet

<!--1. DispatcherServlet-->
<servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><!--注意 : 此处需要引入 spring 的整体应用配置文件-applicationContext.xml--><param-value>classpath:applicationContext.xml</param-value></init-param><load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>/</url-pattern>
</servlet-mapping>

● 中文乱码过滤

<!--2. 中文乱码过滤-->
<filter><filter-name>encodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>utf-8</param-value></init-param>
</filter>
<filter-mapping><filter-name>encodingFilter</filter-name><url-pattern>/*</url-pattern>
</filter-mapping>

● Session

<!--Session-->
<session-config><session-timeout>15</session-timeout>
</session-config>

4) 测试

● 编写 `index.jsp`

<%--User: whyDate: 2021/9/16Time: 17:03
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html><head><title>首页</title></head><body><h3><a href="${pageContext.request.contextPath}/book/allBooks">进入书籍页面</a></h3></body>
</html>

● 新建测试页面

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<%--User: whyDate: 2021/9/16Time: 20:02
--%>
<%@ page isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>All Books</title><!-- 最新版本的 Bootstrap 核心 CSS 文件 --><link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body><div class="container"><div class="row clearfix"><div class="col-md-12 column"><div class="page-header"><h1><small>书籍列表</small></h1></div></div></div><div class="row clearfix"><div class="col-md-12 column"><table class="table table-hover table-striped"><thead><tr><th>编号</th><th>数量</th><th>数量</th><th>详情</th></tr></thead><tbody><%--items 的值是控制器中 model.addAttribute("books", books); 的关键字 "books" --%><c:forEach var="book" items="${books}"><tr><td>${book.bookId}</td><td>${book.bookName}</td><td>${book.bookCounts}</td><td>${book.detail}</td></tr></c:forEach></tbody></table></div></div></div>
</body>
</html>

● 新建控制器

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package com.why.controller;import com.why.pojo.Books;
import com.why.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;import java.util.List;/*** TODO* Book 控制器* @author why* @since 2021/9/16 19:51*/
@Controller
@RequestMapping("/book")
public class BookController {// 自动装配@Autowired// 指定一个 bean （bookServiceImpl）为 bookService 属性进行装配，可省略@Qualifier("bookServiceImpl")private BookService bookService;@RequestMapping("/allBooks")public String allBooks(Model model) {List<Books> books = bookService.queryAllBook();model.addAttribute("books", books);return "allBooks";}}

● 发布项目中导入依赖

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● 添加服务器

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● 运行服务器

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Spring MVC 整合完毕！！！

(6) 整合测试

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(7) CRUD

1) 增加

● 添加界面元素

<div class="col-md-1 column"><a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook"><%--添加--%><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-plus-lg" viewBox="0 0 16 16"><path d="M8 0a1 1 0 0 1 1 1v6h6a1 1 0 1 1 0 2H9v6a1 1 0 1 1-2 0V9H1a1 1 0 0 1 0-2h6V1a1 1 0 0 1 1-1z"/></svg></a>
</div>

● 添加跳转控制器

@RequestMapping("/toAddBook")
public String toAddBook() {return "addBook";
}

● 新建增加界面

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<%--Created by IntelliJ IDEA.User: LENOVODate: 2021/9/17Time: 19:24To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Add Book</title><!-- 最新版本的 Bootstrap 核心 CSS 文件 --><link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body><div class="container"><div class="row clearfix"><div class="col-md-12 column"><div class="page-header"><h1><small>添加书籍</small></h1></div></div></div><form action="${pageContext.request.contextPath}/book/addBook" method="post"><div class="form-group"><label for="name">书名</label><%--name 属性值与实体类属性同名--%><input type="text" class="form-control" id="name" name="bookName" required></div><div class="form-group"><label for="counts">数量</label><input type="text" class="form-control" id="counts" name="bookCounts" required></div><div class="form-group"><label for="detail">描述</label><input type="text" class="form-control" id="detail" name="detail" required></div><button type="submit" class="btn btn-primary">添加</button></form></div></body>
</html>

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● 添加增加书籍控制器

@RequestMapping("/addBook")
public String addBook(Books book) {System.out.println("addBook.book => "+book);Integer addRes = bookService.addBook(book);System.out.println("addRes => " + addRes);return "redirect:/book/allBooks";
}

2) 删除

● 添加界面元素

<th>操作</th>
...
<td><a class="btn btn-primary" href="${pageContext.request.contextPath}/book/deleteBook/${book.bookId}"><%--删除--%><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-x-square" viewBox="0 0 16 16"><path d="M14 1a1 1 0 0 1 1 1v12a1 1 0 0 1-1 1H2a1 1 0 0 1-1-1V2a1 1 0 0 1 1-1h12zM2 0a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V2a2 2 0 0 0-2-2H2z"/><path d="M4.646 4.646a.5.5 0 0 1 .708 0L8 7.293l2.646-2.647a.5.5 0 0 1 .708.708L8.707 8l2.647 2.646a.5.5 0 0 1-.708.708L8 8.707l-2.646 2.647a.5.5 0 0 1-.708-.708L7.293 8 4.646 5.354a.5.5 0 0 1 0-.708z"/></svg></a>
</td>

● 添加删除控制器

@RequestMapping("/deleteBook/{id}")
public String deleteBook(@PathVariable("id") Integer id) {Integer deleteRes = bookService.deleteBookById(id);System.out.println("deleteRes => " + deleteRes);return "redirect:/book/allBooks";
}

3) 修改

● 添加界面元素

<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookId}">
<%--修改--%>
<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-pencil-square" viewBox="0 0 16 16">
<path d="M15.502 1.94a.5.5 0 0 1 0 .706L14.459 3.69l-2-2L13.502.646a.5.5 0 0 1 .707 0l1.293 1.293zm-1.75 2.456-2-2L4.939 9.21a.5.5 0 0 0-.121.196l-.805 2.414a.25.25 0 0 0 .316.316l2.414-.805a.5.5 0 0 0 .196-.12l6.813-6.814z"/>
<path fill-rule="evenodd" d="M1 13.5A1.5 1.5 0 0 0 2.5 15h11a1.5 1.5 0 0 0 1.5-1.5v-6a.5.5 0 0 0-1 0v6a.5.5 0 0 1-.5.5h-11a.5.5 0 0 1-.5-.5v-11a.5.5 0 0 1 .5-.5H9a.5.5 0 0 0 0-1H2.5A1.5 1.5 0 0 0 1 2.5v11z"/>
</svg>
</a>

● 添加跳转控制器

@RequestMapping("/toUpdate")
public String toUpdate(Integer id, Model model) {Books book = bookService.queryBookById(id);System.out.println("toUpdate.book => "+book);model.addAttribute("book", book);return "updateBook";
}

● 添加修改界面

在这里插入图片描述

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Update Book</title><!-- 最新版本的 Bootstrap 核心 CSS 文件 --><link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
</head>
<body><div class="container"><div class="row clearfix"><div class="col-md-12 column"><div class="page-header"><h1><small>修改书籍</small></h1></div></div></div><form action="${pageContext.request.contextPath}/book/updateBook" method="post"><div class="form-group"><label for="id">编号</label><%--type 为隐藏域name 属性值与实体类属性同名从toUpdatePage 控制器取出 value 属性值--%><input type="text" class="form-control" id="id" name="bookId" value="${book.bookId}" readonly></div><div class="form-group"><label for="name">书名</label><input type="text" class="form-control" id="name" name="bookName" value="${book.bookName}" required></div><div class="form-group"><label for="counts">数量</label><input type="text" class="form-control" id="counts" name="bookCounts" value="${book.bookCounts}" required></div><div class="form-group"><label for="detail">描述</label><input type="text" class="form-control" id="detail" name="detail" value="${book.detail}" required></div><button type="submit" class="btn btn-primary">修改</button></form></div></body>
</html>

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● 添加修改控制器

@RequestMapping("/updateBook")
public String updateBook(Books book) {System.out.println("updateBook.book => "+book);Integer updateRes = bookService.updateBook(book);System.out.println("updateRes => " + updateRes);return "redirect:/book/allBooks";
}

4) 查询

● 添加界面元素

<div class="col-md-10"><form action="${pageContext.request.contextPath}/book/queryBookByName" method="post"><div class="input-group"><%--name 属性值与 Controller 参数名一致--%><input type="text" name="name" class="form-control" placeholder="请输入书籍名称" required><span class="input-group-btn"><button class="btn btn-default" type="submit" id="search"><%--搜索--%><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" fill="currentColor" class="bi bi-search" viewBox="0 0 20 20"><path d="M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001c.03.04.062.078.098.115l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85a1.007 1.007 0 0 0-.115-.1zM12 6.5a5.5 5.5 0 1 1-11 0 5.5 5.5 0 0 1 11 0z"/></svg></button></span></div></form>
</div><div class="col-md-1 column"><a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBooks"><%--显示全部书籍--%><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-layout-text-sidebar-reverse" viewBox="0 0 16 16"><path d="M12.5 3a.5.5 0 0 1 0 1h-5a.5.5 0 0 1 0-1h5zm0 3a.5.5 0 0 1 0 1h-5a.5.5 0 0 1 0-1h5zm.5 3.5a.5.5 0 0 0-.5-.5h-5a.5.5 0 0 0 0 1h5a.5.5 0 0 0 .5-.5zm-.5 2.5a.5.5 0 0 1 0 1h-5a.5.5 0 0 1 0-1h5z"/><path d="M16 2a2 2 0 0 0-2-2H2a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V2zM4 1v14H2a1 1 0 0 1-1-1V2a1 1 0 0 1 1-1h2zm1 0h9a1 1 0 0 1 1 1v12a1 1 0 0 1-1 1H5V1z"/></svg></a>
</div>
...
<%--警告提示框--%>
<c:if test="${error!=null}"><div id="alert" class="alert alert-warning"><a href="#" class="close" data-dismiss="alert">&times;</a><strong>${error}</strong></div>
</c:if><%--关闭警告框--%>
<script>$(function(){$(".close").click(function(){$("#alert").alert();});});
</script>

● 添加查询控制器

@RequestMapping("/queryBookByName")
public String queryBookByName(String name, Model model) {System.out.println("queryBookByName.name => " + name);if (name == null || name.equals("")) {return "redirect:/book/allBooks";}List<Books> books = bookService.queryBookByName(name);System.out.println("queryBookByName.books.size => " + books.size());if (books.size() == 0) {String error = "警告！没有查询到此书籍。";model.addAttribute("error", error);books = bookService.queryAllBook();}model.addAttribute("books", books);return "allBooks";
}

在这里插入图片描述