ssm框架整合（简单图书管理）

SSM框架整合

学习视频，B站狂神说Java_springMVC

1、环境要求（笔者自己的环境）

环境：

IDEA 2019.03
MySQL 8.0.22
Tomcat 9
Maven 3.6

要求：熟练掌握MySQL 数据库，Spring，JavaWeb及Mybatis知识，简单的前端知识

如果前端知识拿不出手，可以直接利用工具生成前端代码:BootStrap可视化布局

2、准备工作

创建一个存放书籍的数据库表

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、基本环境搭建

新建一个普通的Maven项目，添加web支持（也可以直接创建一个Maven web项目工程）并配置Tomcat

导入相关的pom依赖

<!--    导入依赖：
        junit, 数据库驱动， 连接池， servlet, jsp, mybatis, mybatis-spring, spring...
 -->
    <dependencies>
        <!--junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>
        <!--mysql 数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.22</version>
        </dependency>
        <!--数据库连接池c3p0-->
        <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>


        <!--servlet-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <!--jsp-->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <!--jstl-->
        <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>5.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>

<!--        导入lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>

    </dependencies>

pom.xml添加静态资源过滤配置

    <!--    静态资源导出问题-->
    <!--在build中配置resources，来防止我们资源导出失败的问题-->
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

    <!-- 解决配置文件中有中文而导致的错误-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

建立项目的包结构

mybatis配置文件（初始）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>

Spring配置文件（初始）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
        https://www.springframework.org/schema/beans/spring-beans.xsd">

</beans>

4、Mybatis层整合

1、数据库配置文件db.properties

jdbc.driver=com.mysql.jdbc.Driver
# 如果使用的时mysql8.0+，需要增加一个时区的配置； &serverTimezone=Asia/Shanghai
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=root

2、IDEA中打开指定的数据库

3、编写mybatis核心配置文件mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

<!-- configuration资源配置-->
<configuration>

    <!--设置日志-->
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>

    <!--别名-->
    <typeAliases>
        <package name="com.liuxingwu.pojo"/>
    </typeAliases>

    <mappers>
        <mapper class="com.liuxingwu.dao.BookMapper"/>
    </mappers>

</configuration>

4、编写数据库对应的实体类（pojo包）

偷懒的方式：需要导入lombok依赖，如果idea没有事先下载lombok插件的话还需要下载后重启idea

package com.liuxingwu.pojo;

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

/**
 * @author saodisheng
 * @Date 2021/3/5
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;
}

5、编写Dao层的Mapper接口

package com.liuxingwu.dao;

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

import java.awt.print.Book;
import java.util.List;

/**
 * @author saodisheng
 * @Date 2021/3/5
 */
public interface BookMapper {
    // 增加一本书
    int addBook(Books books);
    // 删除一本书
    int deleteBook(int id);
    // 更新一本书
    int updateBook(Books books);
    // 查询一本数据
    Books queryBookById(@Param("bookId") int id);
    // 查询全部书
    List<Books> queryAllBooks();
}

6、编写接口对应的Mapper.xml文件

当然也可以通过注解实现，这里使用的是XML配置文件实现

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<!-- configuration资源配置-->
<mapper namespace="com.liuxingwu.dao.BookMapper">

<!--    增加一本书-->
    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books (bookName, bookCounts, detail)
        values (#{bookName}, #{bookCounts}, #{detail})
    </insert>
<!--    删除一本书-->
    <delete id="deleteBook" >
        delete from ssmbuild.books where bookID = #{bookId}
    </delete>
<!--    更新一本书-->
    <update id="updateBook" parameterType="Books">
        update ssmbuild.books
        set bookName = #{bookName}, bookCounts = #{bookCounts}, detail = #{detail}
        where bookID = #{bookID}
    </update>
<!--    查询一本书-->
    <select id="queryBookById"  resultType="Books">
        select * from ssmbuild.books where bookID = #{bookId}
    </select>
    <!--    查询全部书-->
    <select id="queryAllBooks"  resultType="Books">
        select * from ssmbuild.books
    </select>
</mapper>

7、业务层service层的接口及其实现类

接口

package com.liuxingwu.service;

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

import java.util.List;

/**
 * @author saodisheng
 * @Date 2021/3/5
 */
public interface BookService {
    // 增加一本书
    int addBook(Books books);
    // 删除一本书
    int deleteBook(int id);
    // 更新一本书
    int updateBook(Books books);
    // 查询一本数据
    Books queryBookById(int id);
    // 查询全部书
    List<Books> queryAllBooks();
}

实现类

package com.liuxingwu.service;

import com.liuxingwu.dao.BookMapper;
import com.liuxingwu.pojo.Books;
import org.junit.Test;

import java.awt.print.Book;
import java.util.List;

/**
 * @author saodisheng
 * @Date 2021/3/5
 */
public class BookServiceImpl implements BookService {
    // Service层要调用dao层的方法，因此需要将组合一个dao层的实例
    private BookMapper bookMapper;


    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }

    public int addBook(Books books) {
        return bookMapper.addBook(books);
    }

    public int deleteBook(int id) {
        return bookMapper.deleteBook(id);
    }

    public int updateBook(Books books) {
        System.out.println(books);
        bookMapper.updateBook(books);
        return 1;
    }

    public Books queryBookById(int id) {
        return bookMapper.queryBookById(id);
    }

    public List<Books> queryAllBooks() {
        return bookMapper.queryAllBooks();
    }
}

5、Spring层整合

编写配置Spring配置文件，整合Mybatis

1、spring-dao.xml(整合dao层)，这里使用的是c3p0连接池

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
    
    <!--    1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:db.properties"/>


    <!--    2.连接池
            dbcp: 半自动化操作，不能自动连接
            c3p0: 自动化操作（自动化的加载配置文件，并且可以自动设置到对象中）
            druid:
            hikari:
     -->
    <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的独有属性-->
        <!--设置连接池的数量范围-->
        <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"/>
        <!--当获取连接失败时再重试次数-->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!--    3.sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--绑定Mybatis的配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    <!--配置dao接口扫描包，动态地实现了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"/>
        <!--要扫描的包 dao层-->
        <property name="basePackage" value="com.liuxingwu.dao"/>
    </bean>
</beans>

2、spring-service.xml(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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
    
	<!--1.扫描service下的包 业务层-->
    <context:component-scan base-package="com.liuxingwu.service"/>
    
	<!--2.将所有的业务类注入到Spring，可以通过配置，或者注解-->
    <bean id="BookServiceImpl" class="com.liuxingwu.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>
    
	<!--3.声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    
	<!--4.aop事务支持-->

</beans>

6、SpringMVC层整合

1、SpringMVC配置文件spring-mvc.xml

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

    <!--    1.注解驱动-->
    <mvc:annotation-driven/>
    
    <!--    2.打开静态资源过滤-->
    <mvc:default-servlet-handler/>
    
    <!--    3.扫描包：Controller 控制层-->
    <cnntext:component-scan base-package="com.liuxingwu.controller"/>
    
    <!--    4.视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

2、合并资源配置文件 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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="spring-dao.xml"/>
    <import resource="spring-service.xml"/>
    <import resource="spring-mvc.xml"/>
</beans>

3、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 SpringMVC控制中心 -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    
	<!--    乱码过滤-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
	<!--自定义session的失效时间-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

截止目前，基本的ssm框架已经整合完毕了。

7、Controller和视图层的编写

1、查询全部书籍

控制层：BookController

package com.liuxingwu.controller;

import com.liuxingwu.pojo.Books;
import com.liuxingwu.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.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

/**
 * @author saodisheng
 * @Date 2021/3/5
 */
@Controller
@RequestMapping("/book")
public class BookController {
    // Controller调用Service层
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService ;

    // 查询全部的书籍，并且返回一个书籍展示页面
    @RequestMapping("/allbook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBooks();
        model.addAttribute("list", list);
        return "allBook";
    }
}

编写首页index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>首页</title>
    <style>
      a{
        text-decoration: none;  /*去除链接的下划线*/
        color: black; /*设置链接字体颜色为黑色*/
        font-size: 18px; /*设置字体大小*/
      }
      h3{
         180px;
        height: 38px;
        margin: 100px auto; /*设置外边距*/
        text-align: center; /*居中*/
        line-height: 38px;
        background: deepskyblue;
        border-radius: 5px; /*圆边框*/
      }
    </style>
  </head>
  <body>
  <h3>
    <a href="${pageContext.request.contextPath}/book/allbook">进入书籍页面</a>
  </h3>
  </body>
</html>

书籍列表界面allbook.jsp（也是主要界面）

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示</title>
    <%--    美化界面--%>
    <!-- 新 Bootstrap 核心 CSS 文件 -->
    <link href="https://cdn.staticfile.org/twitter-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">
            <h1>
                <small>书籍列表————显示所有书籍</small>
            </h1>
        </div>
    </div>
    <div class="row">
        <div class="col-md-4 cloumn">
            <!--toAddBook-->
            <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
            <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allbook">显示所有书籍</a>
        </div>

        <div class="col-md-8 cloumn">
            <!--查询书籍-->
            <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float:right">
                <span style="color: red">${error}</span>
                <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的书籍名称">
                <input type="submit" value="查询" class="btn btn-primary">
            </form>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12 cloumn">
            <table class="table table-hover table-striped">
                <thead>
                <tr>
                    <th>书籍编号</th>
                    <th>书籍名称</th>
                    <th>书籍数量</th>
                    <th>书籍详情</th>
                    <th>操作</th>
                </tr>
                </thead>
<%--                书籍从数据库查询出来，从这个list中遍历出来：foreach--%>
                <tbody>
                <c:forEach var="book" items="${list}">
                    <tr>
                        <td>${book.bookID}</td>
                        <td>${book.bookName}</td>
                        <td>${book.bookCounts}</td>
                        <td>${book.detail}</td>
                        <td>
                            <a href="${pageContext.request.contextPath}/book/toUpdateBook?bookID=${book.bookID}">修改</a>
                            <%--添加空格--%>
                            &nbsp; | &nbsp;
                            <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                        </td>
                    </tr>
                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>

</div>
<%--<h1>书籍展示</h1>--%>
</body>
</html>

2、添加数据

BookController

// 跳转到添加书籍页面
@RequestMapping("/toAddBook")
public String toAddPage() {
    return "addBook";
}
// 添加书籍的请求
@RequestMapping("/addBook")
public String addBook(Books books) {
    System.out.println("addBook=>" + books);
    bookService.addBook(books);
    return "redirect:/book/allbook";        // 重定向到@RequestMapping("/allbook")
}

添加书籍页面:addBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>
    <%--    美化界面--%>
    <!-- 新 Bootstrap 核心 CSS 文件 -->
    <link href="https://cdn.staticfile.org/twitter-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">
            <h1>
                <small>新增书籍</small>
            </h1>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/addBook" method="post">
        <div class="form-group">
            <label>书籍名称：</label>
            <input type="text" name="bookName" class="form-control" required>
        </div>
        <div class="form-group">
            <label>书籍数量：</label>
            <input type="text" name="bookCounts" class="form-control" required>
        </div>
        <div class="form-group">
            <label>书籍描述：</label>
            <input type="text" name="detail" class="form-control" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="添加">
        </div>
    </form>
</div>
</body>
</html>

3、修改书籍

BookController

 // 跳转到修改书籍页面
    // 接收前端传来的bookID，通过bookID查询指定的书籍
    @RequestMapping("/toUpdateBook")
    public String toUpdatePage(int bookID, Model model) {
        Books books = bookService.queryBookById(bookID);
        model.addAttribute("QBook", books);
        return "updateBook";
    }
    // 修改书籍的请求
    @RequestMapping("/updateBook")
    public String updateBook(Books books) {
        System.out.println("updateBook=>" + books);
        bookService.updateBook(books);
//        System.out.println("修改成功");
        return "redirect:/book/allbook";        // 重定向到@RequestMapping("/allbook")
    }

修改页面:updateBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>
    <%--    美化界面--%>
    <!-- 新 Bootstrap 核心 CSS 文件 -->
    <link href="https://cdn.staticfile.org/twitter-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">
            <h1>
                <small>修改书籍</small>
            </h1>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
        <%--出现的问题：提交了修改请求，但修改失败
            原因是修改需要主键，但之前没有传递相应的主键
        --%>
        <%--前端传递隐藏于,这点容易忽略，从而造成500错误--%>
        <input type="hidden" name="bookID" value="${QBook.bookID}">
        <div class="form-group">
            <label>书籍名称：</label>
            <input type="text" name="bookName" class="form-control" value="${QBook.bookName}" required>
        </div>
        <div class="form-group">
            <label>书籍数量：</label>
            <input type="text" name="bookCounts" class="form-control" value="${QBook.bookCounts}" required>
        </div>
        <div class="form-group">
            <label>书籍描述：</label>
            <input type="text" name="detail" class="form-control" value="${QBook.detail}" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="修改">
        </div>
    </form>
</div>
</body>
</html>

4、删除书籍

BookController

// 删除书籍
@RequestMapping("/deleteBook/{bookid}")
public String deleteBook(@PathVariable("bookid") int bookID) {
    bookService.deleteBook(bookID);
    return "redirect:/book/allbook";        // 重定向到@RequestMapping("/allbook")
}

8、体会一下在搭建好的ssm框架中添加新功能的步骤

添加一个图书查询的功能

1、dao接口BookMapper

之所以考虑返回一个列表是因为查询的实现采用的是模糊查询

// 通过书籍名称查询一本书名
List<Books> queryBook(String bookName);

2、BookMapper接口对应的配置文件BookMapper.xml

模糊查询

<!--通过书名查询书籍-->
<select id="queryBook" parameterType="string" resultType="Books">
    select * from ssmbuild.books where bookName like "%"#{bookName}"%"
</select>

3、业务层service接口BookService

// 通过书名查询书籍
List<Books> queryBook(String bookName);

4、业务层接口实现类

public List<Books> queryBook(String bookName) {
    return bookMapper.queryBook(bookName);
}

5、控制层BookController

// 查询书籍
@RequestMapping("/queryBook")
public String queryBook(String queryBookName, Model model) {
    List<Books> booksList = bookService.queryBook(queryBookName);
    model.addAttribute("list", booksList);
    if (booksList.size() == 0) {
        model.addAttribute("error", "为找到相关书籍");
    }
    return "allBook";
}

6、视图层：allbook.jsp（在最开始时已经包含了，实际开发时应该是逐步完善功能的）

向大神看齐

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原文地址：https://www.cnblogs.com/Liu-xing-wu/p/14539612.html