SSM整合
SSM 框架整合
1、环境
- IDEA
- MySQL 5.5.40
- Tomcat 9
- Maven 3.6
2、数据库环境
创建一个数据库表
CREATE DATABASE `ssmbuild`; USE `ssmbuild`; DROP TABLE IF EXISTS `books`; CREATE TABLE `books` ( `bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT ‘书id‘, `bookName` VARCHAR(100) NOT NULL COMMENT ‘书名‘, `bookCounts` INT(11) NOT NULL COMMENT ‘数量‘, `detail` VARCHAR(200) NOT NULL COMMENT ‘描述‘, KEY `bookID` (`bookID`) ) ENGINE=INNODB DEFAULT CHARSET=utf8 INSERT INTO `books`(`bookID`,`bookName`,`bookCounts`,`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‘);
3、基本环境搭建
新建Maven项目，ssmbuild，添加web的支持（生成最新的 web.xml 文件）
导入相关的 pom 依赖 pom.xml
junit，数据库驱动，连接池，servlet，jsp，mybatis，mybatis-spring，spring，Lombok插件
<!--依赖：junit，数据库驱动，连接池，servlet，jsp，mybatis，mybatis-spring，spring--> <dependencies> <!--Junit--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <!--数据库驱动--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <!-- 数据库连接池: c3p0、dbcp --> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency> <!--Servlet - JSP --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <!--Mybatis--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.2</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.2</version> </dependency> <!--Spring--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.1.9.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.1.9.RELEASE</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.13</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.10</version> <scope>provided</scope> </dependency> </dependencies>Maven 资源过滤设置
<!--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>建立基本结构和配置框架
com.song.pojo
com.song.dao
com.song.service
com.song.controller
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> </configuration>- 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/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> </beans>
4、Mybatis 层
数据库配置文件 database.properties
jdbc.driver=com.mysql.jdbc.Driver # 如果使用的是 MySQL8.0+，增加一个时区的配置 serverTimezone=Asia/Shanghai jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8 jdbc.username=root jdbc.password=root
IDEA关联数据库
编写 MyBatis 的核心配置文件 mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- 配置数据源交给 Spring 做--> <settings> <setting name="logImpl" value="STDOUT_LOGGING"/> </settings> <typeAliases> <package name="com.song.pojo"/> </typeAliases> <mappers> <mapper class="com.song.dao.BookMapper"/> </mappers> </configuration>编写数据库对应的实体类 com.kuang.pojo.Books （使用lombok插件）
@Data @NoArgsConstructor @AllArgsConstructor public class Books { private int bookID; private String bookName; private int bookCounts; private String detail; }编写 Dao 层的 Mapper 接口
public interface BookMapper { //增加一本书 int addBook(Books books); //根据 id 删除一本书 int deleteBookById(@Param("bookId") int id); //更新一本书 int updateBook(Books books); //根据 id 查询一本书 Books queryBookById(@Param("bookId") int id); //查询全部书 List<Books> queryAllBooks(); //根据 name 查询一本书 Books queryBookByName(@Param("bookName") String bookName); }编写接口对应的 Mapper.xml 文件 BookMapper.xml
需要配置到 MyBatis 的核心配置文件中
<?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.song.dao.BookMapper"> <!--增加一个Book--> <insert id="addBook" parameterType="Books"> insert into ssmbuild.books (bookName, bookCounts, detail) values (#{bookName}, #{bookCounts}, #{detail}); </insert> <!--根据id删除一个Book--> <delete id="deleteBookById" parameterType="_int"> delete from ssmbuild.books where bookID = #{bookId} </delete> <!--更新Book--> <update id="updateBook" parameterType="Books"> update ssmbuild.books set bookName = #{bookName}, bookCounts = #{bookCounts}, detail = #{detail} where bookID = #{bookID}; </update> <!--根据id查询,返回一个Book--> <select id="queryBookById" resultType="Books"> select * from ssmbuild.books where bookID = #{bookId}; </select> <!--查询全部Book--> <select id="queryAllBooks" resultType="Books"> select * from ssmbuild.books; </select> <!--根据name查询,返回一个Book--> <select id="queryBookByName" resultType="Books"> select * from ssmbuild.books where bookName = #{bookName}; </select> </mapper>编写 Service 层的接口和实现类
- 接口 BookService
public interface BookService { //增加一本书 int addBook(Books books); //删除一本书 int deleteBookById(int id); //更新一本书 int updateBook(Books books); //查询一本书 Books queryBookById(int id); //查询全部书 List<Books> queryAllBooks(); Books queryBookByName(String bookName); }- 实现类 BookServiceImpl
public class BookServiceImpl implements BookService { // Service 调用 dao层: 把 dao 层组合进来 private BookMapper bookMapper; public void setBookMapper(BookMapper bookMapper) { this.bookMapper = bookMapper; } public int addBook(Books books) { return bookMapper.addBook(books); } public int deleteBookById(int id) { return bookMapper.deleteBookById(id); } public int updateBook(Books books) { return bookMapper.updateBook(books); } public Books queryBookById(int id) { return bookMapper.queryBookById(id); } public List<Books> queryAllBooks() { return bookMapper.queryAllBooks(); } public Books queryBookByName(String bookName) { return bookMapper.queryBookByName(bookName); } }
5、Spring层
Spring 整合 Mybatis 的相关的配置文件 spring-dao.xml，这里的数据源使用 c3p0 连接池
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="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/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <!--1. 关联数据库配置文件--> <context:property-placeholder location="classpath:database.properties"/> <!--2. 连接池 dbcp：半自动化操作，不能自动连接 c3p0：自动化操作（自动化的加载配置文件，并且可以自动设置到对象中） druid： hikari：springboot 2.x 默认集成 --> <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> <!--3. SqlSessionFactory--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <!--绑定配置文件--> <property name="configLocation" value="classpath:mabatis-config.xml"/> </bean> <!--4. 配置 dao 接口扫描包，动态的实现了 Dao接口可以接入到 Spring容器中--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!--注入 sqlSessionFactory--> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> <!--要扫描的dao包--> <property name="basePackage" value="com.song.dao"/> </bean> </beans>Spring 整合 service 层 spring-service.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" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"> <!--1. 扫描 service下的包--> <context:component-scan base-package="com.song.service"/> <!--2. 将所有的业务类注入到 spring--> <bean id="BookServiceImpl" class="com.song.service.BookServiceImpl"> <property name="bookMapper" ref="bookMapper"/> </bean> <!--3. 声明式事务--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!--注入数据源--> <property name="dataSource" ref="dataSource"/> </bean> <!--4. aop 事务支持--> <!--结合AOP，实现事务的织入--> <!--配置事务通知--> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <!--给哪些方法配置事务--> <!--配置事务的传播特性 propagation--> <tx:attributes> <tx:method name="*" propagation="REQUIRED"/> </tx:attributes> </tx:advice> <!--配置事务切入--> <aop:config> <aop:pointcut id="txPointCut" expression="execution(* com.song.dao.*.*(..))"/> <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/> </aop:config> </beans>
6、SpringMVC 层
**web.xml **中配置 DispatcherServlet 和乱码过滤
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <!--DispatcherServlet--> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <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> <!--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 过期时间--> <session-config> <session-timeout>15</session-timeout> </session-config> </web-app>spring-mvc.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" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <!--1.开启SpringMVC注解驱动--> <mvc:annotation-driven/> <!--2.静态资源过滤--> <mvc:default-servlet-handler/> <!--3.扫描包：controller（扫描web相关的bean）--> <context:component-scan base-package="com.song.controller"/> <!--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> </beans>Spring 配置整合文件，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/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <import resource="classpath:spring-dao.xml"/> <import resource="classpath:spring-service.xml"/> <import resource="classpath:spring-mvc.xml"/> </beans>
配置文件结束，接下来要进行 Controller 和视图层编写，实现功能
7、Controller 和视图层（实现功能）
7.1 查询全部书籍
编写 BookController 类
@Controller @RequestMapping("/book") public class BookController { // Controller调service层 @Autowired @Qualifier("BookServiceImpl") private BookService bookService; // 查询全部的书籍 @RequestMapping("/allBook") public String list(Model model){ List<Books> list = bookService.queryAllBooks(); model.addAttribute("list", list); return "allBook"; // localhost:8080/book/allBook.jsp } }编写首页 index.jsp
点击首页的超链接 进入书籍页面 ，DispatcherServlet 会接收并拦截这个超链接的 url，通过 SpringMVC 中的处理器映射器和适配器，BookController 根据 /book/allBook 执行 list() 方法，进行业务处理并返回模型数据，最后通过视图解析器渲染视图，将结果显示在 allBook.jsp 页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>首页</title> <style> a{ text-decoration: none; color: black; font-size: 18px; } h3{ width: 180px; heigh: 38px; margin: 100px auto; text-align: center; line-height: 38px; background: deepskyblue; border-radius: 5px; } </style> </head> <body> <h3> <a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a> </h3> </body> </html>查询全部书籍后跳转到的页面 allBook.jsp，会将 Controller 中的 list 遍历出来放到一个表格中
使用 Bootstrap 美化界面
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>书籍展示页面</title> <%--Bootstrap美化界面--%> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1> <small>书籍列表 —————— 显示所有书籍</small> </h1> </div> </div> <div class="row"> <div class="col-md-4 column"> <%--toAddBook--%> <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a> <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a> </div> <div class="col-md-4 column"></div> <div class="col-md-4 column"> <%--查询书籍--%> <form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float:right" class="form-inline"> <span style="color:red;font-weight:bold">${error}</span> <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的书籍名称"> <input type="submit" value="查询" class="btn btn-primary"> </form> </div> </div> </div> <div class="row clearfix"> <div class="col-md-12 column"> <table class="table table-hover table-striped"> <thead> <tr> <th>书籍编号</th> <th>书籍名称</th> <th>书籍数量</th> <th>书籍详情</th> <th>操作</th> </tr> </thead> <%--书籍从数据库查询出来，从list中遍历出来：foreach--%> <tbody> <c:forEach var="book" items="${list}"> <tr> <td>${book.bookID}</td> <td>${book.bookName}</td> <td>${book.bookCounts}</td> <td>${book.detail}</td> <td> <a href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a> | <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a> </td> </tr> </c:forEach> </tbody> </table> </div> </div> </div> </body> </html>
7.2 添加书籍
前面的 BookController 类中添加【跳转到增加书籍页面】和【添加书籍的请求】的方法。
在 allBook.jsp 页面添加一个 新增书籍 超链接，点击这个按钮之后根据请求路径 /book/toAddBook 跳转到 addBook.jsp 界面。
添加完书籍之后，根据请求路径 /book/addBook 会重定向到 显示全部书籍 allBook.jsp 页面。
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>// 跳转到增加书籍页面 @RequestMapping("/toAddBook") public String toAddPage(){ return "addBook"; } // 添加书籍的请求 @RequestMapping("/addBook") public String addBook(Books books){ System.out.println("addBook=>"+ books); bookService.addBook(books); return "redirect:/book/allBook"; //重定向到@RequestMapping("/allBook")请求 }添加书籍页面：addBook.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <%--Bootstrap美化界面--%> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1> <small>新增书籍</small> </h1> </div> </div> </div> <form action="${pageContext.request.contextPath}/book/addBook" method="post"> <div class="form-group"> <label>书籍名称：</label> <input type="text" name="bookName" class="form-control" required> </div> <div class="form-group"> <label>书籍数量：</label> <input type="text" name="bookCounts" class="form-control" required> </div> <div class="form-group"> <label>书籍详情：</label> <input type="text" name="detail" class="form-control" required> </div> <div class="form-group"> <input type="submit" class="form-control" value="添加"> </div> </form> </div> </body> </html>
7.3 修改书籍信息
前面的 BookController 类中添加【跳转到修改书籍页面】和【修改书籍的请求】的方法。
在 allBook.jsp 页面的表格中添加一列【操作】的选项，每一行有【修改和删除】的超链接，点击之后会对某个对象进行相应操作。
对于【修改】操作，点击之后根据 /book/toUpdate 跳转到修改页面 updateBook.jsp。注意：要在点击按钮时自动获取 bookID 参数，并将其作为请求参数传入控制器，这样，可以根据 bookID 查询出对应书籍的信息显示在修改页面。
修改后根据请求 /book/updateBook 会将新的 book 对象传入 updateBook，该方法会调用业务层和 dao 层的 update 方法和数据库进行交互，执行完这些操作后重定向到 allBook.jsp
<th>操作</th> <td> <a href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a> | <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a> </td>// 跳转到修改页面 @RequestMapping("/toUpdate") public String toUpdatePage(int id, Model model){ Books books = bookService.queryBookById(id); model.addAttribute("QBooks",books); // QBooks信息会显示在前端 return "updateBook"; } // 修改书籍 @RequestMapping("/updateBook") public String updateBook(Books books){ // 前端修改后的数据传入 System.out.println("updateBook=>" + books); int i = bookService.updateBook(books); if(i>0){ System.out.println("添加books成功" + books); } return "redirect:/book/allBook"; }修改书籍页面 updateBook.jsp
注意：别忘了传递 bookID，否则会传递 bookID=0 修改不成功
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>修改书籍</title> <%--Bootstrap美化界面--%> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </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="${pageContext.request.contextPath}/book/updateBook" method="post"> <%--出现的问题：提交了修改的SQL请求，但是修改失败，初次考虑是事务问题，配置完毕，依旧失败 看SQL语句能否执行成功：SQL执行失败，修改未完成--%>、、 <%--前端传递隐藏域--%> <input type="hidden" name="bookID" value="${QBooks.bookID}"> <div class="form-group"> <label>书籍名称：</label> <input type="text" name="bookName" class="form-control" value="${QBooks.bookName}" required> </div> <div class="form-group"> <label>书籍数量：</label> <input type="text" name="bookCounts" class="form-control" value="${QBooks.bookCounts}" required> </div> <div class="form-group"> <label>书籍详情：</label> <input type="text" name="detail" class="form-control" value="${QBooks.detail}" required> </div> <div class="form-group"> <input type="submit" class="form-control" value="修改"> </div> </form> </div> </body> </html>
7.4 删除书籍
allBook.jsp 页面添加删除的超链接，点击之后会发送 /book/deleteBook/${book.bookID} 请求
<a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>前面的 BookController 类中添加【根据 id 删除书籍】的方法。
该方法接收到请求参数，调用 service 和 dao 层执行删除操作，最后重定向到 allBook.jsp
// 删除书籍 这里使用了RestFul风格 @RequestMapping("/deleteBook/{bookId}") public String deleteBook(@PathVariable("bookId") int id){ bookService.deleteBookById(id); return "redirect:/book/allBook"; }
7.5 搜索书籍（根据名称查询书籍）
在 allBook.jsp 页面添加一个 form 表单，输入书籍名称后点击查询会发送 /book/queryBook 请求，Controller 会根据这个请求做出相应处理。
<%--查询书籍--%> <form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float:right" class="form-inline"> <span style="color:red;font-weight:bold">${error}</span> <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的书籍名称"> <input type="submit" value="查询" class="btn btn-primary"> </form>前面的 BookController 类中添加【根据名称查询书籍】的方法。
查询完成之后转发到 allBook.jsp 页面，输入为空或者输入不匹配会显示“未查到”，仍显示全部书籍。
// 查询书籍 @RequestMapping("/queryBook") public String queryBook(String queryBookName, Model model){ Books books = bookService.queryBookByName(queryBookName); List<Books> list = new ArrayList<Books>(); list.add(books); //查询优化 if(books == null){ list = bookService.queryAllBooks(); model.addAttribute("error", "未查到"); } model.addAttribute("list", list); return "allBook"; }
8、结果展示
index.jsp
allBook.jsp
addBook.jsp
updateBook.jsp
9、注意事项
要确保 IDEA 的项目发布中，添加 lib 依赖，否则会出现 404 错误
要确保 Tomcat 服务器中部署了项目
服务器使用说明
- 修改了 java 代码，Redeploy
- 修改了配置文件，重启服务器
- 修改了前端页面，更新资源
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