PyQT5 中兩個介面之間資料傳遞

阿新 • • 發佈：2020-08-10

整合SSM框架

一、環境配置

軟體版本

IDEA
MySQL 5.7.19
Tomcat 9
Maven 3.6

資料庫環境

建立一個存放書籍資料的資料庫表

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,'從進門到進牢');

排錯思路

寫程式碼難免遇到各種 bug ，下面是一些問題的解決思路

問題一 500錯誤：bean 不存在

1. 檢視這個 bean 注入是否成功

Junit 單元測試，看程式碼是否能夠查詢出結果

在 test 中新建一個測試類(假設檢視idea的output，發現找不到bean：service中的BookService)

import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void test(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        BookService bookServiceImpl = (BookService) context.getBean("BookServiceImpl");
        for (Books books : bookServiceImpl.queryAllBook()) {
            System.out.println(books);
        }
    }
}

1. 若第二步成功，則說明問題不在底層，是Spring出了問題
1. SpringMVC 整合時，沒有呼叫service層的bean
- 可能applicationContext.xml 沒有注入bean
- 可能web.xml 中，繫結的配置檔案有問題，要確定裡面有service層的bean

基本環境搭建

新建一個 maven 的 web 專案
匯入相關的依賴

<dependencies>
    <!--Junit-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <!--資料庫驅動-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.47</version>
    </dependency>
    <!-- 資料庫連線池 -->
    <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>

Maven資源過濾設定

<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>

連線資料庫
建立基本結構和配置框架

建立目錄

com.kuang.pojo
com.kuang.dao
com.kuang.service
com.kuang.controller

編寫MyBatis配置檔案框架（如：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>

編寫 Spring 的配置檔案 (如：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>

Mybatis 層編寫

編寫資料庫配置檔案(如：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

編寫MyBatis的核心配置檔案(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>
    <!--匯入properties 配置檔案，配置資料來源的工作交給Spring完成-->

    <!-- 類型別名 -->
    <typeAliases>
        <package name="com.kuang.pojo"/>
    </typeAliases>
    <!--Mybatis的mapper註冊，定義 SQL 對映語句-->
    <mappers>
        <mapper resource="com/kuang/dao/BookMapper.xml"/>
    </mappers>
</configuration>

編寫資料庫對應的實體類( com.kuang.pojo.Books)

package com.kuang.pojo;

public class Books {

    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;

    // getter,setter,構造方法，toString
}

編寫Dao層的 Mapper介面

package com.kuang.dao;

import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookMapper {

    //增加一個Book
    int addBook(Books book);

    //根據id刪除一個Book
    int deleteBookById(int id);

    //更新Book
    int updateBook(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();

}

編寫介面對應的 Mapper.xml 檔案。需要匯入MyBatis的包

在Dao目錄下編寫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.kuang.dao.BookMapper">

    <!--增加一個Book-->
    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books(bookName,bookCounts,detail)
        values (#{bookName}, #{bookCounts}, #{detail})
    </insert>

    <!--根據id刪除一個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>

    <!--根據id查詢,返回一個Book-->
    <select id="queryBookById" resultType="Books">
        select * from ssmbuild.books
        where bookID = #{bookID}
    </select>

    <!--查詢全部Book-->
    <select id="queryAllBook" resultType="Books">
        SELECT * from ssmbuild.books
    </select>

</mapper>
<!-- 寫完後在MyBatis配置檔案裡註冊 -->

編寫Service層的介面和實現類

介面

package com.kuang.service;

import com.kuang.pojo.Books;

import java.util.List;

//BookService:底下需要去實現,呼叫dao層
public interface BookService {
    //增加一個Book
    int addBook(Books book);
    //根據id刪除一個Book
    int deleteBookById(int id);
    //更新Book
    int updateBook(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();
}

實現類

package com.kuang.service;

import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;
import java.util.List;

public class BookServiceImpl implements BookService {

    //呼叫dao層的操作，設定一個set介面，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();
    }
}

到這裡，底層需求操作編寫好了

Spring層編寫

配置Spring整合MyBatis，這裡資料來源使用 c3p0 連線池
編寫Spring整合Mybatis的相關的配置檔案；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.關聯資料庫檔案，下面是專門匯入資料庫檔案 -->
    <context:property-placeholder location="classpath:database.properties"/>

    <!-- 2.資料庫連線池 -->
    <!--資料庫連線池
       dbcp 半自動化操作 不能自動連線
       c3p0 自動化操作（自動的載入配置檔案 並且設定到物件裡面）
   -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置連線池屬性 -->
        <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連線池的私有屬性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 關閉連線後不自動commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 獲取連線超時時間 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 當獲取連線失敗重試次數 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!-- 3.配置SqlSessionFactory物件 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入資料庫連線池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 繫結MyBaties全域性配置檔案:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!-- 4.配置掃描Dao介面包，動態實現Dao介面注入到spring容器中 -->
    <!--解釋 ：https://www.cnblogs.com/jpfss/p/7799806.html-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 給出需要掃描Dao介面包 -->
        <property name="basePackage" value="com.kuang.dao"/>
    </bean>
</beans>

Spring整合service層(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"
       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">

    <!-- 1.掃描service下的包 -->
    <context:component-scan base-package="com.kuang.service" />
    <!-- 2.將所有業務類注入到 Spring，可以通過配置或註解實現 -->
    <!--BookServiceImpl注入到IOC容器中-->
    <bean id="BookServiceImpl" class="com.kuang.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">
        <!-- 注入資料來源 -->
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 4.aop事務支援，需要時可加 -->
</beans>

Spring層完成！再次理解一下，Spring就是一個大雜燴，一個容器

SpringMVC層編寫

增加 Web 的支援，配置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:我們這裡載入的是總的配置檔案，之前被這裡坑了！-->  
            <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，亂碼過濾-->
    <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>

    <!--為了安全起見，設定Session過期時間-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>

</web-app>

配置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.開啟SpringMVC註解驅動 -->
    <mvc:annotation-driven />
    <!-- 2.靜態資源預設servlet配置，靜態資源過濾-->
    <mvc:default-servlet-handler/>

    <!-- 3.檢視解析器 -->
    <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.掃描web相關的bean。掃描包：controller -->
    <context:component-scan base-package="com.kuang.controller" />

</beans>

Spring配置整合檔案(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>

到這裡，配置檔案就暫時結束了，後面可以加業務。下面寫一個例子

二、業務程式碼編寫

Controller 和檢視層編寫

BookController 類編寫，方法一：查詢全部書籍

package com.kuang.controller;

import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

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

    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;
    // 查詢全部書籍，並且返回到一個書籍展示頁面
    @RequestMapping("/allBook")
    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">點選進入列表頁</a>
        </h3>
    </body>
</html>

編寫書籍列表頁面 (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>
        <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>書籍列表 —— 顯示所有書籍</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>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="${requestScope.get('list')}">
                                <tr>
                                    <td>${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()}">刪除</a>
                                    </td>
                                </tr>
                            </c:forEach>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>

新增功能

BookController 類編寫，方法二：新增書籍

package com.kuang.controller;

import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

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

    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;
    // 查詢全部書籍，並且返回到一個書籍展示頁面
    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list", list);
        return "allBook";
    }

    // 跳轉到新增書籍頁面
    @RequestMapping("/toAddBook")
    public String toAddPaper() {
        return "addBook";
    }
    // 新增書籍的請求
    @RequestMapping("/addBook")
    public String addPaper(Books books) {
        System.out.println(books);
        bookService.addBook(books);
        // 回到首頁
        return "redirect:/book/allBook";
    }
}

新增書籍頁面(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>新增書籍</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>新增書籍</small>
                        </h1>
                    </div>
                </div>
            </div>
            <%--這裡將資訊傳送到addBook，識別後完成新增--%>
            <%--required保證資訊填寫完整才能提交--%>
            <form action="${pageContext.request.contextPath}/book/addBook" method="post">
                書籍名稱：<input type="text" name="bookName" required><br><br><br>
                書籍數量：<input type="text" name="bookCounts" required><br><br><br>
                書籍詳情：<input type="text" name="detail" required><br><br><br>
                <input type="submit" value="新增">
            </form>

        </div>

BookController 類編寫，方法三：修改書籍

//跳轉到修改頁面
@RequestMapping("/toUpdateBook")
public String toUpdateBook(Model model, int id) {
    Books books = bookService.queryBookById(id);
    System.out.println(books);
    model.addAttribute("book",books );
    return "updateBook";
}
//修改書籍
@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";
}

修改書籍頁面(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>修改資訊</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>修改資訊</small>
                        </h1>
                    </div>
                </div>
            </div>

            <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
                <input type="hidden" name="bookID" value="${book.getBookID()}"/>
                書籍名稱：<input type="text" name="bookName" value="${book.getBookName()}"/>
                書籍數量：<input type="text" name="bookCounts" value="${book.getBookCounts()}"/>
                書籍詳情：<input type="text" name="detail" value="${book.getDetail() }"/>
                <input type="submit" value="提交"/>
            </form>

        </div>

BookController 類編寫，方法四：刪除書籍

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

新增日誌功能(在mybatis-config.xml新增)

<!--新增日誌功能-->
<settings>
    <setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>

查詢功能【待完善】

① 在allbook.jsp中新增

<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</a>
        </div>
        <div class="col-md-4 column"></div>
        <%--新增查詢功能--%>
        <div class="col-md-4 column">
            <form class="from-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="queruBookName" class="form-inline" placeholder="請輸入要查詢的書籍名稱">
                <input type="submit" value="查詢" class="btn btn-primary">
            </form>
        </div>
    </div>

② 在BookController中新增

/*查詢功能*/
    /*queruBookName是前端的，這裡是allbook.jsp中*/
    @RequestMapping("/queryBook")
    public String queryBook(String queruBookName,Model model){

    }

③ 在Dao的BookMapper介面中新增查詢功能

Books queruBookByName(@Param("bookName") String bookName);

④ 在BookMapper.xml中新增查詢的SQL語句

<!--查詢語句，id與介面中的一致。parameterType是String型別，基本型別可不寫-->
    <select id="queruBookByName" resultType="Books">
        select * from ssmbuild.books where bookName = #{bookName}
    </select>

為安全起見，可以在BookMapper中加上

Books queruBookByName(@Param("bookName") String bookName);

至此，Dao層編寫完畢，接下來是service層

⑥ 在service中的BookService介面中新增

Books queruBookByName(String bookName);

⑦ 在BookService介面的實現類中重寫方法(BookServiceImpl)

@Override
    public Books queruBookByName(String bookName) {
        return bookMapper.queruBookByName(bookName);
    }

底層到這裡就結束了

⑧ controller中的BookController進行呼叫

 /*查詢功能*/
    /*queruBookName是前端的，這裡是allbook.jsp中*/
    @RequestMapping("/queryBook")
    public String queryBook(String queruBookName,Model model){
        Books books = bookService.queruBookByName(queruBookName);
        System.err.println(books);
        /*查詢後只顯示需要的資料*/
        List<Books> list = new ArrayList<Books>();
        list.add(books);
        if (books == null){
            list = bookService.queryAllBook();
            model.addAttribute("error","未查到");
        }
        model.addAttribute("list", list);
        return "allbook";
    }

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