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SSM整合

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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

  1. 新建Maven项目,ssmbuild,添加web的支持(生成最新的 web.xml 文件)

  2. 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>
    
  3. 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>
    
  4. 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

  1. 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
    
  2. IDEA关联数据库

  3. 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>
    
  4. 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;
    }
    
  5. 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);
    }
    
  6. 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>
    
  7. 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

  1. 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>
    
  2. 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

  1. **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>
    
  2. 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>
    
  3. 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

  1. 编写 BookController

    @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
        }
    }
    
  2. 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>
    
  3. 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=${book.bookID}">修改</a>
                                    &nbsp; | &nbsp;
                                    <a href="${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

  1. 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。

    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
    }
    
  2. 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

  1. 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。

    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>
        &nbsp; | &nbsp;
        <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";
    }
    
  2. 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

  1. 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>
    
  2. 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)

  1. 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>
    
  2. 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

    技术图片

  • allBook.jsp

    技术图片

  • addBook.jsp

    技术图片

  • updateBook.jsp

    技术图片

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

    技术图片

  • 要确保 Tomcat 服务器中部署了项目

    技术图片

  • 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

技术图片

SSM整合

标签:label   orm   struct   linu   figure   适配器   ret   pat   图解   

原文地址:https://www.cnblogs.com/Songzw/p/13192529.html

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