SpringMVC-06-SSM整合-牛翰网

1、环境要求

IDEA
MySQL 8.x
Tomcat 9
Maven 3.6

这只是大型软件要求，项目相关的jar包依赖将在Maven中配置。

项目前置技能：MySQL、Mybatis、Spring、JavaWeb、简单的前端知识。

2、数据库表

创建一个存放书籍数据的数据库表

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、基本项目搭建

新建Maven项目，SpringMVC-06-SSM，添加web框架支持。

编写pom.xml，导入依赖

<dependencies>
    <!--Junit-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <!-- Lombok -->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.32</version>
    </dependency>
    <!--数据库驱动-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.16</version>
    </dependency>
    <!-- 数据库连接池 -->
    <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>2.1</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>2.1.2</version>
    </dependency>
    <!--Spring-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.2.12.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.2.12.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.4</version>
    </dependency>
</dependencies>

建立基本结构和配置框架

com.moondream.controller 控制层
com.moondream.service 服务层
com.moondream.dao 持久层
com.moondream.pojo 实体类
web/WEB-INF/jsp 视图层

resources

mybatis-config.xml Mybatis核心配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>

    <typeAliases>
        <package name=""/>
    </typeAliases>

    <mappers>
        <mapper resource=""/>
    </mappers>
</configuration>

applicationContext.xml Spring全局配置文件

<?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/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">

</beans>

4、Mybatis层(DAO层)

数据库配置文件 db.properties

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
user=root
password=123456

编写数据库表对应的实体类，使用Lombok依赖减少代码量

package com.moondream.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Book {
    private Integer bookID;
    private String bookName;
    private Integer bookCounts;
    private String detail;
}

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"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>

    <typeAliases>
        <package name="com.moondream.pojo"/>
    </typeAliases>

    <mappers>
        <mapper resource="mybatis/BookMapper.xml"/>
    </mappers>
</configuration>

编写Mybatis的mapper映射文件 BookMapper.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.moondream.dao.BookMapper">

    <!-- 增加一个Book -->
    <insert id="addBook">
        insert into ssmbuild.books
        values (#{bookID}, #{bookName}, #{bookCounts}, #{detail});
    </insert>

    <!-- 根据ID删除一个Book -->
    <delete id="deleteBookById">
        delete
        from ssmbuild.books
        where bookID = #{bookID};
    </delete>

    <!-- 根据ID更新一个Book -->
    <update id="updateBook">
        update ssmbuild.books
        set bookName=#{bookName},
            bookCounts=#{bookCounts},
            detail=#{detail}
        where bookID = #{bookID};
    </update>

    <!-- 查询全部Book -->
    <select id="queryAllBook" resultType="Book">
        select *
        from ssmbuild.books;
    </select>

    <!-- 根据ID查询一个Book -->
    <select id="queryBookById" resultType="Book">
        select *
        from ssmbuild.books
        where bookID = #{bookID}
    </select>

</mapper>

编写mapper映射文件对应的接口，可以更方便的调用Mybatis

package com.moondream.dao;

import com.moondream.pojo.Book;

import java.util.List;

public interface BookMapper {
    //增加一个Book
    int addBook(Book book);

    //根据id删除一个Book
    Integer deleteBookById(Integer id);

    //更新Book
    Integer updateBook(Book Book);

    //根据id查询,返回一个Book
    Book queryBookById(Integer id);

    //查询全部Book,返回list集合
    List<Book> queryAllBook();
}

编写 spring-dao.xml，把Mybatis整合进Spring

<?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">

    <!-- 配置整合mybatis -->
    <!-- 1.关联数据库文件 -->
    <!-- property-placeholder:
         将properties文件中的属性加载进xml中
    -->
    <context:property-placeholder location="classpath:mybatis/db.properties"/>

    <!-- 2.数据库连接池 -->
    <!--数据库连接池(连接关闭后不会销毁，而是返回连接池中，避免连接重复创建)
        dbcp  半自动化操作  不能自动连接
        c3p0  自动化操作（自动的加载配置文件 并且设置到对象里面）
        druid
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${driver}"/>
        <property name="jdbcUrl" value="${url}"/>
        <property name="user" value="${user}"/>
        <property name="password" value="${password}"/>
        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <property name="initialPoolSize" 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.配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 配置MyBatis核心配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>
    </bean>

    <!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到IOC容器中 -->
    <!--解释 ： https://www.cnblogs.com/jpfss/p/7799806.html-->
    <!--
        此配置可以用 <mybatis:scan base-package=""/> 标签代替，
        相同的是，IOC容器中也得有 SqlSessionFactoryBean 才行
    -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.moondream.dao"/>
    </bean>

</beans>

到此，持久层编写完毕！

5、Spring层(Service层)

编写业务接口和接口实现

package com.moondream.service;

import com.moondream.pojo.Book;

import java.util.List;

//BookService: 需要具体实现,调用dao层
public interface BookService {
    //增加一个Book
    Integer addBook(Book book);

    //根据id删除一个Book
    Integer deleteBookById(Integer id);

    //更新Book
    Integer updateBook(Book Book);

    //根据id查询,返回一个Book
    Book queryBookById(Integer id);

    //查询全部Book,返回list集合
    List<Book> queryAllBook();
}

package com.moondream.service;

import com.moondream.dao.BookMapper;
import com.moondream.pojo.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class BookServiceImpl implements BookService {
    //调用dao层
    @Autowired
    private BookMapper bookMapper;

    public Integer addBook(Book book) {
        return bookMapper.addBook(book);
    }

    public Integer deleteBookById(Integer id) {
        return bookMapper.deleteBookById(id);
    }

    public Integer updateBook(Book Book) {
        return bookMapper.updateBook(Book);
    }

    public Book queryBookById(Integer id) {
        return bookMapper.queryBookById(id);
    }

    public List<Book> queryAllBook() {
        return bookMapper.queryAllBook();
    }
}

编写 spring-service.xml ，Spring的service层配置文件

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

    <!-- 扫描Service层的组件 -->
    <context:component-scan base-package="com.moondream.service"/>

    <!-- 配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 声明式事务 事务代码与业务代码分离 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="add*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <!-- 只读事务 会在数据库和驱动支持的情况下，做一些可能的优化 -->
            <tx:method name="query*" read-only="true"/>
        </tx:attributes>
    </tx:advice>
    <aop:config>
        <aop:advisor advice-ref="txAdvice" pointcut="within(com.moondream.service.*+)"/>
    </aop:config>

    <!-- 开启切面自动代理，即可以使用切面注解！ -->
    <aop:aspectj-autoproxy/>
</beans>

服务层编写完毕！

6、SpringMVC层(Controller层)

由于 Controller层 需要不断的与 View层 进行联动，
所以当我们编写完Controller层，其实View层也已经完成的差不多了。

编写 web.xml

<?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">

    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！-->
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--EncodingFilter-->
    <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>

编写 spring-controller.xml ，Spring的Controller层配置

<?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
       https://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 配置SpringMVC -->
    <!-- 1.扫描Controller层组件 -->
    <context:component-scan base-package="com.moondream.controller"/>
    <!-- 2.开启注解驱动 -->
    <mvc:annotation-driven/>
    <!-- 3.使用defaultServlet处理静态资源 -->
    <mvc:default-servlet-handler/>
    <!-- 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>

配置文件，暂时结束！现在进行 Controller层和 View层编写

BookController 类编写，方法一：查询全部书籍

package com.moondream.controller;

@Controller
@RequestMapping("/book")
public class BookController {
    @Autowired
    private BookService bookService;

    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Book> list = bookService.queryAllBook();
        model.addAttribute("list", list);
        return "allBook";
    }
}

编写首页 index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE HTML>
<html>
<head>
    <title>首页</title>
    <style type="text/css">
        a {
            text-decoration: none;
            color: black;
            font-size: 18px;
        }

        h3 {
            width: 180px;
            height: 38px;
            margin: 100px auto;
            text-align: center;
            line-height: 38px;
            background: deepskyblue;
            border-radius: 4px;
        }
    </style>
</head>
<body>
<h3>
    <a href="${pageContext.request.contextPath}/book/allBook">点击进入列表页</a>
</h3>
</body>
</html>

书籍列表页面 allbook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍列表</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 Bootstrap -->
    <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>
    <div class="row">
        <div class="col-md-4 column">
            <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增</a>
        </div>
    </div>
    <div class="row clearfix">
        <div class="col-md-12 column">
            <table class="table table-hover table-striped">
                <thead>
                <tr>
                    <th>书籍编号</th>
                    <th>书籍名字</th>
                    <th>书籍数量</th>
                    <th>书籍详情</th>
                    <th>操作</th>
                </tr>
                </thead>
                <tbody>
                <c:forEach var="book" items="${list}">
                    <tr>
                        <td>${book.getBookID()}</td>
                        <td>${book.getBookName()}</td>
                        <td>${book.getBookCounts()}</td>
                        <td>${book.getDetail()}</td>
                        <td>
                            <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">更改</a> |
                            <a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}">删除</a>
                        </td>
                    </tr>
                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>

BookController 类编写，方法二：添加书籍

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

@RequestMapping("/addBook")
public String addPaper(Book book) {
    System.out.println(book);
    bookService.addBook(book);
    return "redirect:/book/allBook";
}

添加书籍页面：addBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 Bootstrap -->
    <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">
        书籍名称：<input type="text" name="bookName"><br><br><br>
        书籍数量：<input type="text" name="bookCounts"><br><br><br>
        书籍详情：<input type="text" name="detail"><br><br><br>
        <input type="submit" value="添加">
    </form>
</div>

BookController 类编写，方法三：修改书籍

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

@RequestMapping("/updateBook")
public String updateBook(Book book) {
    System.out.println(book);
    bookService.updateBook(book);
    return "redirect:/book/allBook";
}

修改书籍页面 updateBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改信息</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 Bootstrap -->
    <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>修改信息</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
        <input type="hidden" name="bookID" value="${book.getBookID()}"/>
        书籍名称：<input type="text" name="bookName" value="${book.getBookName()}"/>
        书籍数量：<input type="text" name="bookCounts" value="${book.getBookCounts()}"/>
        书籍详情：<input type="text" name="detail" value="${book.getDetail() }"/>
        <input type="submit" value="提交"/>
    </form>
</div>

BookController 类编写，方法四：删除书籍

@RequestMapping("/del/{bookId}")
public String deleteBook(@PathVariable Integer bookId) {
    bookService.deleteBookById(bookId);
    return "redirect:/book/allBook";
}

Controller层与 View层编写完毕！

最后，做一些收尾和辅助性的工作，比如，横切日志提示，表明当前程序执行到哪一步了……

在com.moondream包下，新增log包，编写切面

package com.moondream.log;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

import java.text.SimpleDateFormat;
import java.util.Date;

@Aspect
@Component
public class IndicationLog {

    @Around("within(com.moondream.*.*+)")
    public Object Indication(ProceedingJoinPoint pjp) throws Throwable {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String date = sdf.format(new Date());

        System.err.println("[" + date + "] " + pjp.getSignature().toShortString() + " ==>");
        Object value = pjp.proceed();
        System.err.println("<== " + pjp.getSignature().toShortString());
        return value;
    }
}

整合Spring的全局配置文件 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"
       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">

    <!-- 
        这里不用担心重复扫描的问题，
            Spring不会重复扫描相同的包
     -->
    <context:component-scan base-package="com.moondream"/>
    <import resource="spring/spring-dao.xml"/>
    <import resource="spring/spring-service.xml"/>
    <import resource="spring/spring-controller.xml"/>

</beans>

7、配置Tomcat，启动测试

到目前为止，这个SSM项目整合已经完全的OK了，可以直接运行进行测试！这个练习十分的重要，大家需要保证，不看任何东西，自己也可以完整的实现出来！

项目结构图

8、新增功能–查询书籍

之前，我们是从零开始搭建项目，所有需求都是定好的，
所以可以自下而上搭建，这样不至于在业务和底层接口之间频繁辗转，
而且编写的接口更容易做到复用，进而获得更好的经济性。

那么，如果是项目要新增功能呢？

这个时候，项目的基本框架已经成型，
一般是使用自上而下的方式来开发，这样更容易把握整体性。

编写前端页面

<div class="col-md-4 column"></div>
<div class="col-md-8 column">
    <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBookByName" method="post" style="float: right">
        <span style="color:red;font-weight: bold">${error}</span>
        <input type="text" name="queryBookName" class="form-control" placeholder="可以少字，但不要错字~" required>
        <input type="submit" value="查询" class="btn btn-primary">
    </form>
</div>

编写查询的Controller方法

@RequestMapping("queryBookByName")
public String queryBook(String queryBookName, Model model) {
    //业务逻辑还没有写
    return "allBook";
}

编写Service接口

//根据name模糊查询Book
List<Book> queryBookByName(String bookName);

编写Mapper接口

//根据name模糊查询Book
List<Book> queryBookByName(String bookName);

编写mapper.xml配置文件

<select id="queryBookByName" resultType="Book">
    select *
    from ssmbuild.books
    where bookName like concat('%', #{bookName}, '%')
</select>

编写Service实现类

public List<Book> queryBookByName(String bookName) {
    return bookMapper.queryBookByName(bookName);
}

补全Controller

@RequestMapping("queryBookByName")
public String queryBook(String queryBookName, Model model) {
    List<Book> list = bookService.queryBookByName(queryBookName.trim());

    if (list.size() == 0) {
        model.addAttribute("error", "没有找到本书！");
        return "forward:/book/allBook";
    }

    model.addAttribute("list", list);
    return "allBook";
}

前端增加一个显示全部书籍的按钮，方便查询后返回，提高用户体验

<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a>

测试，查询功能OK！

9、小结

SSM的整合案例到这里就结束了，SSM框架在Java企业级开发中的重要地位不需要多说。

我们通过这个项目已经能够独立的去开发一些小网站了，但是这只是增删改查的基本操作，还远远不够！

敬请期待，新的篇章：

Ajax
拦截器
文件上传与下载
SpringBoot 以及 SpringCloud……

来源链接：https://www.cnblogs.com/blog-moondream/p/18579239

本站所有资源来自于网络，仅供学习与参考，请勿用于商业用途，否则产生的一切后果将由您(转载者)自己承担！
如有侵犯您的版权，请及时联系3500663466#qq.com(#换@)，我们将第一时间删除本站数据。

THE END

Java 后端开发编程开发