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SpringMVC系列——整合SSM(七)7、整合SSM下一篇: 8、Json 链接

7、整合SSM

  • 7.1 环境要求
  • 7.2 数据库环境
  • 7.3 基本环境搭建
  • 7.4 Mybatis层编写
  • 7.5 Spring层
  • 7.6 SpringMVC层
  • 7.7 小结
  • 7.8 实现查询功能

7.1、环境要求

环境：

  • IDEA
  • MySQL 5.7.19
  • Tomcat 9
  • Maven 3.6

要求：

  • 需要熟练掌握MySQL数据库，Spring，JavaWeb及MyBatis知识，简单的前端知识；

7.2、数据库环境

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');

7.3、基本环境搭建

  1. 新建一Maven项目！ ssmbuild ， 添加web的支持
  2. 导入相关的pom依赖！ 
<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 -->
  <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>
  </dependencies>
  1. Maven资源过滤设置 
<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>
  1. 建立基本结构和配置框架！
  • com.kuang.pojo
  • com.kuang.dao
  • com.kuang.service
  • com.kuang.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>

7.4、Mybatis层编写

  1. 数据库配置文件 database.properties 
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?
useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456
  1. IDEA关联数据库
  2. 编写MyBatis的核心配置文件 
<?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>
 
  <typeAliases>
    <package name="com.kuang.pojo"/>
  </typeAliases>
  <mappers>
    <mapper resource="com/kuang/dao/BookMapper.xml"/>
  </mappers>
</configuration>

  1. 编写数据库对应的实体类 com.kuang.pojo.Books

    使用lombok插件！

package com.kuang.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
 
  private int bookID;
  private String bookName;
  private int bookCounts;
  private String detail;
 
}
  1. 编写Dao层的 Mapper接口！ 
package com.kuang.dao;
import com.kuang.pojo.Books;
import java.util.List;
public interface BookMapper {
  //增加一个Book
  int addBook(Books book);
  //根据id删除一个Book
  int deleteBookById(int id);
  //更新Book
  int updateBook(Books books);
  //根据id查询,返回一个Book
  Books queryBookById(int id);
  //查询全部Book,返回list集合
  List<Books> queryAllBook();
}
  1. 编写接口对应的 Mapper.xml 文件。需要导入MyBatis的包； 
<?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.kuang.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="queryAllBook" resultType="Books">
   SELECT * from ssmbuild.books
  </select>
  </mapper>

  1. 编写Service层的接口和实现类

    接口：

package com.kuang.service;
import com.kuang.pojo.Books;
import java.util.List;
//BookService:底下需要去实现,调用dao层
public interface BookService {
  //增加一个Book
  int addBook(Books book);
  //根据id删除一个Book
  int deleteBookById(int id);
  //更新Book
  int updateBook(Books books);
  //根据id查询,返回一个Book
  Books queryBookById(int id);
  //查询全部Book,返回list集合
  List<Books> queryAllBook();
}

实现类：

package com.kuang.service;
import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;
import java.util.List;
public class BookServiceImpl implements BookService {
  //调用dao层的操作，设置一个set接口，方便Spring管理
  private BookMapper bookMapper;
  public void setBookMapper(BookMapper bookMapper) {
    this.bookMapper = bookMapper;
 }
 
  public int addBook(Books book) {
    return bookMapper.addBook(book);
 }
 
  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> queryAllBook() {
    return bookMapper.queryAllBook();
 }
}

OK，到此，底层需求操作编写完毕！

7.5、Spring层

  1. 配置Spring整合MyBatis，我们这里数据源使用c3p0连接池；
  2. 我们去编写Spring整合Mybatis的相关的配置文件； spring-dao.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">
  <!-- 配置整合mybatis -->
  <!-- 1.关联数据库文件 -->
  <context:property-placeholder
location="classpath:database.properties"/>
  <!-- 2.数据库连接池 -->
  <!--数据库连接池
    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）
  -->
  <bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <!-- 配置连接池属性 -->
    <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.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MyBaties全局配置文件:mybatis-config.xml -->
    <property name="configLocation" value="classpath:mybatis-
config.xml"/>
  </bean>
  <!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
  <!--解释 ： https://www.cnblogs.com/jpfss/p/7799806.html-->
  <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.kuang.dao"/>
  </bean>
</beans>
  1. Spring整合service层 
<?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
  http://www.springframework.org/schema/context/spring-context.xsd">
  <!-- 扫描service相关的bean -->
  <context:component-scan base-package="com.kuang.service" />
  <!--BookServiceImpl注入到IOC容器中-->
  <bean id="BookServiceImpl"
class="com.kuang.service.BookServiceImpl">
    <property name="bookMapper" ref="bookMapper"/>
  </bean>
  <!-- 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>
</beans>

Spring层搞定！再次理解一下，Spring就是一个大杂烩，一个容器！对吧！

7.6、SpringMVC层

  1. 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">
  <!--DispatcherServlet-->
  <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>
  1. 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:context="http://www.springframework.org/schema/context"
   xmlns:mvc="http://www.springframework.org/schema/mvc"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context.xsd
  http://www.springframework.org/schema/mvc
  https://www.springframework.org/schema/mvc/spring-mvc.xsd">
  <!-- 配置SpringMVC -->
  <!-- 1.开启SpringMVC注解驱动 -->
  <mvc:annotation-driven />
  <!-- 2.静态资源默认servlet配置-->
  <mvc:default-servlet-handler/>
  <!-- 3.配置jsp 显示ViewResolver视图解析器 -->
  <bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver
">
    <property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/jsp/" />
    <property name="suffix" value=".jsp" />
  </bean>
  <!-- 4.扫描web相关的bean -->
  <context:component-scan base-package="com.kuang.controller" />
</beans>
  1. 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="spring-dao.xml"/>
  <import resource="spring-service.xml"/>
  <import resource="spring-mvc.xml"/>
 
</beans>

配置文件，暂时结束！Controller 和 视图层编写

  1. BookController 类编写 ， 方法一：查询全部书籍 
@Controller
@RequestMapping("/book")
public class BookController {
  @Autowired
  @Qualifier("BookServiceImpl")
  private BookService bookService;
  @RequestMapping("/allBook")
  public String list(Model model) {
    List<Books> list = bookService.queryAllBook();
    model.addAttribute("list", list);
    return "allBook";
    }
}
  1. 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="${pageContext.request.contextPath}/book/allBook">点击进入列表
页</a>
</h3>
</body>
</html>
  1. 书籍列表页面 allbook.jsp 
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
  <title>书籍列表</title>
  <meta name="viewport" content="width=device-width, initial-
scale=1.0">
  <!-- 引入 Bootstrap -->
  <link
href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
rel="stylesheet">
</head>
<body>
<div class="container">
  <div class="row clearfix">
    <div class="col-md-12 column">
      <div class="page-header">
       <h1>
          <small>书籍列表 —— 显示所有书籍</small>
        </h1>
      </div>
    </div>
  </div>
  <div class="row">
    <div class="col-md-4 column">
      <a class="btn btn-primary"
href="${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="${requestScope.get('list')}">
          <tr>
            <td>${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/${book.getBookID()}">
删除</a>
            </td>
          </tr>
        </c:forEach>
        </tbody>
      </table>
    </div>
  </div>
</div>
  1. BookController 类编写 ， 方法二：添加书籍 
@RequestMapping("/toAddBook")
public String toAddPaper() {
  return "addBook";
}
@RequestMapping("/addBook")
public String addPaper(Books books) {
  System.out.println(books);
  bookService.addBook(books);
  return "redirect:/book/allBook";
}
  1. 添加书籍页面：addBook.jsp 
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
  <title>新增书籍</title>
  <meta name="viewport" content="width=device-width, initial-
scale=1.0">
  <!-- 引入 Bootstrap -->
  <link
href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
rel="stylesheet">
</head>
<body>
<div class="container">
  <div class="row clearfix">
    <div class="col-md-12 column">
      <div class="page-header">
        <h1>
          <small>新增书籍</small>
        </h1>
      </div>
    </div>
  </div>
  <form action="${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>
  1. BookController 类编写 ， 方法三：修改书籍 
@RequestMapping("/toUpdateBook")
public String toUpdateBook(Model model, int id) {
  Books books = bookService.queryBookById(id);
  System.out.println(books);
  model.addAttribute("book",books );
  return "updateBook";
  }
@RequestMapping("/updateBook")
public String updateBook(Model model, Books book) {
  System.out.println(book);
  bookService.updateBook(book);
  Books books = bookService.queryBookById(book.getBookID());
  model.addAttribute("books", books);
  return "redirect:/book/allBook";
}
  1. 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>
  1. BookController 类编写 ， 方法四：删除书籍 
@RequestMapping("/del/{bookId}")
public String deleteBook(@PathVariable("bookId") int id) {
  bookService.deleteBookById(id);
  return "redirect:/book/allBook";
}

配置Tomcat，进行运行！

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

SpringMVC系列——整合SSM(七)7、整合SSM下一篇: 8、Json 链接

7.7、小结及展望

这个是大家的第一个SSM整合案例，一定要烂熟于心！

SSM框架的重要程度是不言而喻的，学到这里，大家已经可以进行基本网站的单独开发。但是这只是增

删改查的基本操作。可以说学到这里，大家才算是真正的步入了后台开发的门。也就是能找一个后台相

关工作的底线。

或许很多人，工作就做这些事情，但是对于个人的提高来说，还远远不够！

我们后面还要学习一些 SpringMVC 的知识！

  • Ajax 和 Json
  • 文件上传和下载
  • 拦截器

SpringBoot、SpringCloud开发！

7.8、实现查询书籍功能

  1. 前端页面增加一个输入框和查询按钮 
<div class="col-md-4 column"></div>
<div class="col-md-4 column">
  <form class="form-inline" action="/book/queryBook" method="post"
style="float: right">
    <input type="text" name="queryBookName" class="form-control"
placeholder="输入查询书名" required>
    <input type="submit" value="查询" class="btn btn-primary">
  </form>
</div>
  1. 编写查询的Controller 
@RequestMapping("/queryBook")
public String queryBook(String queryBookName,Model model){
  System.out.println("要查询的书籍:"+queryBookName);
//业务逻辑还没有写
  return "allBook";
}
  1. 由于底层没有实现，所以我们要将底层代码先搞定
  2. Mapper接口 
//根据id查询,返回一个Book
Books queryBookByName(String bookName);
  1. Mapper.xml 
<!--根据书名查询,返回一个Book-->
<select id="queryBookByName" resultType="Books">
 select * from ssmbuild.books
 where bookName = #{bookName}
</select>
  1. Service接口 
//根据id查询,返回一个Book
Books queryBookByName(String bookName);
  1. Service实现类 
public Books queryBookByName(String bookName) {
  return bookMapper.queryBookByName(bookName);
}
  1. 完善Controller 
@RequestMapping("/queryBook")
public String queryBook(String queryBookName,Model model){
  System.out.println("要查询的书籍:"+queryBookName);
  Books books = bookService.queryBookByName(queryBookName);
  List<Books> list = new ArrayList<Books>();
  list.add(books);
  model.addAttribute("list", list);
  return "allBook";
}
  1. 测试，查询功能OK！

  2. 无聊优化！我们发现查询的东西不存在的时候，查出来的页面是空的，我们可以提高一下用户的体

    验性！

    1. 在前端添加一个展示全部书籍的按钮
    2. 并在后台增加一些判断性的代码！ 
@RequestMapping("/queryBook")
public String queryBook(String queryBookName,Model model){
  System.out.println("要查询的书籍:"+queryBookName);
  //如果查询的数据存在空格，则优化
  Books books =
bookService.queryBookByName(queryBookName.trim());
  List<Books> list = new ArrayList<Books>();
  list.add(books);
  //如果没有查出来书籍，则返回全部书籍列表
  if (books==null){
    list = bookService.queryAllBook();
    model.addAttribute("error", "没有找到本书！");
 }
  model.addAttribute("list", list);
  return "allBook";
}
  1. 将错误信息展示在前台页面！完整的查询栏代码 
<div class="row">
  <div class="col-md-4 column">
    <a class="btn btn-primary"
href="${pageContext.request.contextPath}/book/toAddBook">新增</a>
    <a class="btn btn-primary"
href="${pageContext.request.contextPath}/book/allBook">显示全部书籍
</a>
  </div>
  <div class="col-md-8 column">
    <form class="form-inline" action="/book/queryBook"
method="post" style="float: right">
      <span style="color:red;font-weight: bold">${error}
</span>
      <input type="text" name="queryBookName" class="form-
control" placeholder="输入查询书名" required>
      <input type="submit" value="查询" class="btn btn-
primary">
    </form>
  </div>
</div>

收工!

下一篇: 8、Json 链接

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