SSM整合

本文轉載自查看原文 2020-11-12 10:47 532 Spring、SpringMVC、Mybatis、SpringBoot

SSM框架整合

環境

IDEA
MySQL 5.5
Tomcat 8.5.34
Maven 3.6.0

搭建數據庫(MySQL)

CREATE DATABASE `ssmbuild`;

USE `ssmbuild`;

DROP TABLE IF EXISTS `books`;

CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '書id',
`bookName` VARCHAR(100) NOT NULL COMMENT '書名',
`bookCounts` INT(11) NOT NULL COMMENT '數量',
`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,'從入門到放棄'),
(2,'MySQL',10,'從刪庫到跑路'),
(3,'Linux',5,'從入門到進牢');

基本項目的搭建

新建maven項目,添加web支持

導入相關的maven依賴

<dependencies>
   <!--Junit-->
   <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.12</version>
   </dependency>
   <!--數據庫驅動-->
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>5.1.47</version>
   </dependency>
   <!-- 數據庫連接池 -->
   <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>

3.Maven資源過濾問題

<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>

建立基本結構和配置框架

com.inspur.pojo (持久層)
com.inspur.dao (Dao層)
com.inspur.service (業務處理層)
com.inspur.controller (業務控制層)

mybatis-config.xml (可在IDEA中設置xml模版) --> File | Settings | 編輯器 | 文件和代碼模板

<?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>
    
    <!-- 別名設置 pojo:實體類上可加注解 @Alias("books")-->
    <!--可在Mapper.xml文件中使用時無需類的全限定名,默認為類名 -->
    <typeAliases>
        <package name=""/>
    </typeAliases>
    <!-- mapper文件路徑 -->
    <mappers>
        <mapper resource=""></mapper>
    </mappers>
</configuration>

applicationContext.xml (IDEA含有spring的初始化的配置文件)

<?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>

Mybatis層

數據庫配置文件db.properties (設為模版,同上), --> 在Spring配置文件中讀取

jdbc.driver=com.mysql.jdbc.Driver
#如果使用MySQL8.0+,需要增加一個時區的配置; &serverTimezone=Asia/Shanghai
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

IDEA關聯數據庫(idea自帶的數據庫鏈接)

編寫(完善配置信息注意標簽的順序)MyBatis的核心配置文件(mybatis-config.xml)

    <!-- 標准的 日志工廠實現  -->
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
        <!--  是否開啟自動駝峰命名規則 (camel case)映射 -->
        <!--  <setting name="mapUnderscoreToCamelCase" value="true"/>-->
		<!-- 開啟全局緩存  -->
        <setting name="cacheEnabled" value="true"/>
    </settings>


<typeAliases>
	<package name="com.inspur.pojo"/>
</typeAliases>
<mappers>
	<mapper resource="com.inspur.dao.BookNapper.xml"/>
</mappers>

編寫數據庫對應的實體類com.inspur.pojo.Books

使用Lombok插件

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.apache.ibatis.type.Alias;
import java.io.Serializable;
/**
 * @author 12093
 * @Created by 12093
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
@Alias("books")   //可在Mapper.xml文件中使用,無需類的全限定名
public class Books implements Serializable {
     //我們需要將實體類序列化(implements Serializable)！否則就會報錯！
     private int bookID;
     private String bookName;
     private int bookCounts;
     private String detail;
}

編寫Dao層的Mapper接口

import com.inspur.pojo.Books;
import org.apache.ibatis.annotations.Param;
import java.util.List;
/**
 * @author 12093
 */
public interface BookMapper {
    //實現 增/刪/改/查
    // 增加一本書
    int addBook(Books books);
    //  刪除一本書
    int deleteBookById(@Param("bookID") int id);
    // 更新一本書
    int updateBookById(Books books);
	// 查詢一本書
    Books queryBookById(@Param("bookID") int id);
    // 查詢全部的書
    List<Books> queryAllBook();
    //根據ID查詢一本書
    List queryBookByName(@Param("bookName") String bookName);
    
}

編寫接口對應的Mapper.xml文件(最好與其接口同名/同路徑)

<?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">
<!--   MyBatis映射文件  -->
<!--namespace=綁定一個對應的Dao/Mapper接口-->
<mapper namespace="com.inspur.dao.BookMapper">
    <cache/>   <!-- 設置此xml文件,使用二級緩存  -->
    
    <!--增加一個Book-->
    <insert id="addBook" parameterType="Books">
        insert into books (bookName,bookCounts,detail)
        values (#{bookName},#{bookCounts},#{detail});
    </insert>

     <!--根據id刪除一個Book-->
    <delete id="deleteBookById" parameterType="int">
        delete from books where bookID = #{bookID}
    </delete>

    <!--更新Book-->
    <update id="updateBookById" parameterType="Books">
        update books
        set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
        where bookID=#{bookID};
    </update>

    <!--根據id查詢,返回一個Book-->
    <select id="queryBookById" resultType="Books">
        select * from books 
        where bookID = #{bookID}
    </select>
    
    <!--查詢全部Book-->
    <select id="queryAllBook" resultType="Books">
        select * from books;
    </select>
    
    <!--根據bookName查詢,返回一個Book-->
    <select id="queryBookByName" resultType="Books">
        select * from books where bookName like "%"#{bookName}"%"
    </select>
    
</mapper>

編寫Service層的接口和實現類

接口:

package com.inspur.service;

import com.inspur.pojo.Books;
import java.util.List;
/**
 * @author 12093
 * @Classname BookService
 * @Date 2020/11/8 22:58
 *   BookService:底下需要去實現,調用dao層
 */
public interface BookService {
    // 增加一本Book
    int addBook(Books books);
    
    //根據id刪除一本書Book
    int deleteBookById(int id);

    // 更新Book
    int updateBookById(Books books);

    //根據ID查詢,返回一個Book
    Books queryBookById(int id);

    //查詢全部Book,返回list集合
    List<Books> queryAllBook();
    
    //根據書名模糊查詢一本書
 List<Books> queryBookByName(@Param("bookName") String bookName);
}

   
   實現類:
   
   ```java
   mport com.inspur.dao.BookMapper;
   import com.inspur.pojo.Books;
   import java.util.List;
   public class BookServiceImpl implements BookService{
      
       //service調dao層:  組合Dao    可添加業務
       private BookMapper bookMapper;
   
       public void setBookMapper(BookMapper bookMapper) {
           this.bookMapper = bookMapper;
       }
   
       @Override
       public int addBook(Books books) {
           return bookMapper.addBook(books);
       }
   
       @Override
       public int deleteBookById(int id) {
           return bookMapper.deleteBookById(id);
       }
   
       @Override
       public int updateBookById(Books books) {
           return bookMapper.updateBookById(books);
       }
   
       @Override
       public Books queryBookById(int id) {
           return bookMapper.queryBookById(id);
       }
   
       @Override
       public List<Books> queryAllBook() {
           return bookMapper.queryAllBook();
    }
       
     @Override
       public List<Books> queryBookByName(String bookName) {
           return bookMapper.queryBookByName(bookName);
       }
   }

底層需求操作完畢

Spring層

🕶️注意事項: 所有的Spring的配置文件,配置的應用程序上下文在一個文件中

配置 Spring整合MyBatis ,這里使用c3p0連接池;

我們去編寫Spring整合MyBatis的相關配置文件; Spring-dao.xml (多個Spring配置文件,整合,分層管理)

<?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">
    
<!--    DataSource:使用Spring的數據源替換MyBatis的配置 c3p0/dbcp/druid-->
<!--    1.關聯數據庫配置文件-->
    <context:property-placeholder location="classpath:db.properties"/>

<!--    2.連接池
        dbcp:半自動化操作,不能自動連接
        c3p0: 自動化操作(自動化的加載配置文件,並且可以自動設置到對象中!)
        druid:   hikari:
-->
     <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連接池的私有屬性    可默認不使用-->
         <property name="maxPoolSize" value="30"/>
         <property name="minPoolSize" value="10"/>
         <!-- 關閉連接后不自動commit -->
         <property name="autoCommitOnClose" value="false"/>
         <!-- 獲取連接超時時間 -->
         <property name="checkoutTimeout" value="10000"/>
         <!-- 當獲取連接失敗重試次數 -->
         <property name="acquireRetryAttempts" value="2"/>
     </bean>

<!--    3.配置sqlSessionFactory對象-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
       <!--  注入數據庫連接池  -->
        <property name="dataSource" ref="dataSource"/>
<!--       配置MyBatis的全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

<!-- 4. 配置dao接口掃描包,動態的實現了Dao接口可以注入到Spring容器中! -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--        注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!--        給出需要掃描的Dao接口包  -->
        <property name="basePackage" value="com.inspur.dao"/>
    </bean>
</beans>

Spring整合Service層

<?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. 掃描service下的包 -->
    <context:component-scan base-package="com.inspur.service"/>

<!--   2. 將我們的所有業務類,注入到springIOC容器中,可以通過配置,或者注解實現-->
    <!-- BookServiceImpl 注入到 IOC容器中  -->
    <bean id="BookServiceImpl" class="com.inspur.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>

<!--   3. 配置事務管理器 -->
    <bean id="TransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入數據源 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>

Spring層搞定! Spring就是一個大雜燴,一個容器!

SpringMVC層

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">
<!--    DispatchServlet  -->
    <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: 這里加載的是總的配置文件!!!  不是Spring-mvc.xml   -->
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <!--   啟動優先級     -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
        <!--  "/",處理所有文件; "/*"不處理.jsp文件    -->
    </servlet-mapping>
    
<!--    亂碼過濾  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過期時間  -->
    <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:nvc="http://www.springframework.org/schema/mvc" 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">

<!--  配置SpringMVC  -->
    <!--    1.開啟SpringMVC注解驅動 -->
    <nvc:annotation-driven/>
    
    <!--    2.靜態資源過濾默認servlet配置 -->
    <mvc:default-servlet-handler/>
    
    <!--    3.掃描web相關的bean:controller -->
    <context:component-scan base-package="com.inspur.controller"/>
    
    <!--    4.配置jsp顯示ViewResolver試圖解析器  -->
    <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">
	<!--    整合配置文件   -->
    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>

</beans>

配置文件,暫時結束! Controller 和視圖層編寫

BookController類編寫, 一、查詢所有書籍

@Controller
@RequestMapping("/book")
public class BookController {

    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    /// 查詢全部書籍,並發揮到一個書籍的展示頁面
    @RequestMapping("/allBook")  //查詢所有Book
    public String list(Model model){
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list",list);
        return "allBook";
    }

編寫首頁index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE HTML>
<html>
<head>
   <title>首頁</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">點擊進入列表頁</a>
</h3>
</body>
</html>

書籍列表展示頁面 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>書籍列表</title>
    
<%--    引入Bootstrap 美化界面 --%>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<%--    Bootstrap框架提供了更好的跨瀏覽器一致性 --%>
    <link href="../../css/normalize.css" rel="stylesheet">
</head>
<body>
<%--邊框線--%>
<div class="container">
    <%-- 清除浮動--%>
    <div class="row clearfix">
    <%--    把一個列中等(md)屏幕(12份)分成12份     --%>
        <div class="col-md-12 column">
            <%-- 頭部 標簽--%>
            <div class="page-header">
                <h1>
                    <small>書籍列表----顯示所有書籍</small>
                </h1>
        </div>
    </div>
    <div class="row">
        <div class="col-md-4 column">
            <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增書籍</a>
            <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">顯示全部書籍</a>
        </div>
        <div class="col-md-4 column"></div>
        <div class="col-md-4 column">
            <%--  查詢書籍  --%>
            <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right">
                <span style="color: red; font-weight: bold">${error}</span>
                <input type="text" name="queryBookName" placeholder="請輸入要查詢的書籍名稱" required>
                <input type="submit" value="查詢" class="btn btn-primary">
            </form>
        </div>
    </div>
    <div class="row clearfix">
        <div class="col-md-12 column">
<%--     table-hover:隔行變色     --%>
            <table class="table table-hover table-striped">
                <thead>
                <tr>
                    <th>書籍編號</th>
                    <th>書籍名字</th>
                    <th>書籍數量</th>
                    <th>書籍詳情</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=${book.getBookID()}">修改</a> |&nbsp;
                            <a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}">刪除</a>
                        </td>
                    </tr>
                </c:forEach>
             </tbody>
            </table>
        </div>
    </div>
</div>
</body>
</html>

添加書籍

//跳轉到添加書籍頁面(addBook.jsp)
    @RequestMapping("/toAddBook")
    public String toAddPaper(){
        return "addBook";
    }
//  從addBook.jsp頁面,返回的書籍數據,添加到數據庫
//添加書籍的請求
    @RequestMapping("/addBook")
    public String addPaper(Books books) {
        System.out.println("books==>"+books);
        bookService.addBook(books);
        return "redirect:/book/allBook";
    }

addBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增書籍</title>
    
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <link href="../../css/normalize.css" rel="stylesheet">
</head>
<body>
<div class="container">

    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>新增書籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/addBook" method="post">
        <div class="form-group">
            <label for="bkname">書籍名稱:</label>
            <input type="text" class="form-control" id="bkname" name="bookName" required>
        </div>
        <div class="form-group">
            <label for="bknum">書籍數量:</label>
            <input type="text" class="form-control" id="bknum" name="bookCounts" required>
        </div>
        <div class="form-group">
            <label for="bkdetail">書籍描述:</label>
            <input type="text" class="form-control" id="bkdetail" name="detail" required>
        </div>
        <button type="submit" class="btn btn-primary">添加</button>
        <a href="${pageContext.request.contextPath}/book/allBook" class="btn btn-default">取消</a>
    </form>


</div>
</body>
</html>

修改書籍

/////   方法三：修改書籍
    // 先根據ID查詢到書籍信息返回至修改頁面,
    // 在updateBook頁面 將id設為隱藏域,再將書籍信息更改后重定向到allBook

    @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("updateBook==>"+book);
        bookService.updateBook(book);
        Books books = bookService.queryBookById(book.getBookID());
        model.addAttribute("books",books);
        return "redirect:/book/allBook";
    }

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>
    
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <link href="../../css/normalize.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="${pageContext.request.contextPath}/book/updateBook" method="post">
<%--        修改書籍需要用到BookID  設置隱藏域   --%>
        <input type="hidden" name="bookID" value="${book.getBookID()}"/>
        <div class="from-group">
            <label>書籍名稱:</label>
            <input  class="form-control" type="text" name="bookName" value="${book.getBookName()}" required/>
        </div>
        <div class="form-group">
            <label>書籍數量:</label>
            <input class="form-control" type="text" name="bookCounts" value="${book.getBookCounts()}" required/>
        </div>
        <div class="form-group">
            <label>書籍詳情:</label>
            <input class="form-control" type="text" name="detail" value="${book.getDetail() }" required/>
        </div>
        <div class="form-group">
            <input class="form-control" type="submit" value="修改"/>
        </div>
        <div class="form-group">
            <a href="${pageContext.request.contextPath}/book/allBook" class="align-middle form-control">取消</a>
        </div>
    </form>

</div>

刪除書籍

////  方法四:  刪除書籍

    @RequestMapping("/del/{bookId}")
    public String deleteBook(@PathVariable("bookId") int id){
        System.out.println("刪除書籍的ID==>"+id);
        bookService.deleteBookById(id);
        return "redirect:/book/allBook";
    }

按書名查詢書籍(找不到則顯示全部書籍,並報錯)

///查詢書籍

    @RequestMapping("/queryBook")
    public String queryBook(String queryBookName,Model model){
//        boolean q = false;
        List<Books> list = bookService.queryBookByName(queryBookName);
        for (Books books : list) {
            //紅色輸出
            System.err.println("queryBookName==>"+books);
        }
        if (list.size() == 0){
            list = bookService.queryAllBook();
            model.addAttribute("error","未查到");
            System.out.println("===未查到===");
        }
        model.addAttribute("list",list);
        return "allBook";
    }

小結(`MySQL數據庫主鍵無法連續自增問題`)

MySQL數據庫:

解決單條數據id自增不連續問題

創建的表的類型為InnoDB類型,為了提升性能設置AUTO_INCREMNT不會回退,因此innoDB使用了不連續的自增值

解決:

使用Mybatis中的標簽

<!-- 當用戶表為空時，id設置為1
當用戶表不為空時，id設置為當前最大id加1   -->
    <insert id="addBook" parameterType="Books">
        <selectKey keyProperty="bookID" resultType="int" order="BEFORE">
            select if(max(bookID) is null,1,max(bookID)+1) as bookID from books
        </selectKey>
        insert into books (bookID,bookName,bookCounts,detail)
        values (#{bookID},#{bookName},#{bookCounts},#{detail});
    </insert>

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