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SSM框架整合——基本增删改查业务的实现

时间:2020-08-13 12:42:10      阅读:51      评论:0      收藏:0      [点我收藏+]

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1、环境要求

  • IDEA
  • MySQL 5.7
  • Tomcat 9
  • Maven 3.6

需要熟练掌握MySQL数据库,Spring,JavaWeb及Mybatis知识,基本的前端知识;

2、数据库环境

create database ssmbuild;

use ssmbuild;

drop table id exists `books`;

CREATE TABLE `books` (
  `book_id` int(11) NOT NULL AUTO_INCREMENT COMMENT ‘书id‘,
  `book_name` varchar(255) NOT NULL COMMENT ‘名书‘,
  `book_counts` int(11) NOT NULL COMMENT ‘量数‘,
  `detail` varchar(255) NOT NULL COMMENT ‘描述‘,
  PRIMARY KEY (`book_id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8

3、基本环境搭建

1、新建maven项目,添加web支持

2、pom依赖导入

<!--依赖-->
<dependencies>
    <!--junit-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <!--mysql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>3.5.5</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.5</version>
    </dependency>

    <!--spring-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.2.7.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.2.8.RELEASE</version>
    </dependency>
</dependencies>

3、maven资源过滤问题

<!--资源过滤-->
<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>

4、建立基本的结构和框架配置

技术图片

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核心配置文件-->
<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
        https://www.springframework.org/schema/beans/spring-beans.xsd">


</beans>

4、Mybatis层编写

1、数据库配置文件database.properties

driver=com.mysql.jdbc.Driver
# 如果使用的是MySQL 8.0+ 需要增加一个时区的配置 serverTimezone=UTC
url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf
username=root
password=123465

2、IDEA关联数据库

技术图片

3、编写mybatis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核心配置文件-->
<configuration>
	
    <settings>
        <!--开启自动驼峰命名规则,数据库带_字段名自动转换为驼峰命名,user_id -> userId -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    
    <!--批量命名别名,默认命名为的别名为类名小写-->
    <typeAliases>
        <package name="com.spong.pojo"/>
    </typeAliases>

</configuration>

4、pojo下创建实体类

Books

(可选择)使用lombok插件生成有参、无参构造及get、set方法

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {

    private Integer bookId;
    private String bookName;
    private Integer bookCounts;
    private  String detail;

}

5、编写dao层

BookMapper接口

public interface BookMapper {

    //新增一本书
    int addBook(Books books);

    //删除一本书
    //@Param 作用是用于传递参数,从而可以与SQL中的的字段名相对应
    int deleteBook(@Param("bookId") Integer id);

    //修改一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(@Param("bookId") Integer id);

    //查询所有书
    List<Books> queryAllBooks();
}

BookMapper.xml实现BookMapper接口

<?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">

<mapper namespace="com.spong.dao.BookMapper">

    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books(book_name, book_counts, detail)
        values (#{bookName},#{bookCounts},#{detail});
    </insert>

    <delete id="deleteBook" parameterType="Integer">
        delete from ssmbuild.books
        where book_id=#{bookId};
    </delete>

    <update id="updateBook" parameterType="Books">
        update ssmbuild.books
        set book_name=#{bookName},
            book_counts=#{bookCounts},
            detail=#{detail}
        where book_id=#{bookId};
    </update>

    <select id="queryBookById" parameterType="Integer" resultType="Books">
        select *
        from ssmbuild.books
        where book_id=#{bookId};
    </select>

    <select id="queryAllBooks" resultType="Books">
        select * from ssmbuild.books;
    </select>
</mapper>

每创建一个mapper就在mybatis核心配置文件中配置

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

6、编写service层

service层调用dao层,使用组合

BookService

public interface BookService {
    //新增一本书
    int addBook(Books books);

    //删除一本书
    int deleteBook(Integer id);

    //修改一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(Integer id);

    //查询所有书
    List<Books> queryAllBooks();
}

BookServiceImpl

public class BookServiceImpl implements BookService {

    //service层调用dao层 组合Dao
    private BookMapper bookMapper;

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

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

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

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

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

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

5、Spring层编写

1、spring-dao.xml配置

  1. Spring关联数据库配置文件

    <!--1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties"/>
    
  2. 连接池(这里使用c3p0)

    <!--2.连接池:
    dbcp: 半自动化操作,不能自动连接
    c3p0: 自动化操作(自动化加载配置文件,并且可以自动设置到对象中)
    druid: 处理的数据量规模较大,可以进行数据的实时查询展示,查询模式是交互式的
    hikari: 速度快、轻量的连接池,相比于其他连接池性能提示
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${driver}"/>
        <property name="jdbcUrl" value="${url}"/>
        <property name="user" value="${username}"/>
        <property name="password" value="${password}"/>
    
        <!--c3p0连接池的一些私有属性-->
        <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. 注册SQLSessionFactory

    <!--3.SQLSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--绑定mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    
  4. 扫描dao包,动态注入到Spring容器中

    <!--4.配置dao扫描包,动态实现dao接口注入到Spring容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--要扫描的dao包-->
        <property name="basePackage" value="com.spong.dao"/>
    </bean>
    

2、Spring-service.xml配置(事务)

  1. 扫描service下的包,实现动态注入

    <!--1.扫描service下的包,注入Spring容器 需要使用注解-->
    <context:component-scan base-package="com.spong.service"/>
    
  2. 也可以选择直接配置service实现类(1,2选一)

    <!--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.spong.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>
    
  3. 声明事务配置

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    
  4. AOP事务(根据需要添加)

    https://www.cnblogs.com/spang/p/13488174.html 供参考

6、SpringMVC层编写

1、web.xml配置

  1. DispatcherServlet 配置

    <!--DispatcherServlet-->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--绑定spring配置文件,获得初始化参数-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    
  2. Filter过滤器

    <!--乱码过滤-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    

    注意这里的url-pattern需要 /* 即jsp页面也需要过滤

    关于web.xml的url映射的小知识:
    < url-pattern>/</url-pattern>  会匹配到/login这样的路径型url,不会匹配到模式为*.jsp这样的后缀型url
    < url-pattern>/*</url-pattern> 会匹配所有url:路径型的和后缀型的url(包括/login,*.jsp,*.js和*.html等)
    
  3. Session相关配置

    <!--Session-->
    <session-config>
        <!--Session保存时间 15分钟-->
        <session-timeout>15</session-timeout>
    </session-config>
    

2、Spring-mvc.xml配置

<!--1.开启注解驱动-->
<mvc:annotation-driven/>
<!--2.开启静态资源过滤-->
<mvc:default-servlet-handler/>
<!--3.扫描包:controller-->
<context:component-scan base-package="com.spong.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>

最后将所有配置文件在applicationContext.xml文件中整合:

<?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="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>

</beans>

到此框架整合完毕,开始视图层和controller层的编写

7、Controller层及视图页面

1.BookController类编写 方法一:查询全部书籍

@Controller
@RequestMapping("/books")
public class BookController {
    //Controller层调Service层
	
    //Spring容器自动注入其中的bookService
    @Autowired
    private BookService bookService;

    //查询全部书籍,并返回一个显示所有书籍的页面
    @RequestMapping("/allBooks")
    public String queryAllBooks(Model model){
        List<Books> booksList = bookService.queryAllBooks();
        model.addAttribute("booksList",booksList);
        return "allBooks";
    }
}

2、书籍列表页面:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" >
</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————新增书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/books/addBook" method="post">
        <div class="form-group">
            <label for="bookName">书籍名称</label>
            <input type="text" name="bookName" class="form-control" id="bookName" required>
        </div>
        <div class="form-group">
            <label for="bookCounts">书籍数量</label>
            <input type="text" name="bookCounts" class="form-control" id="bookCounts" required>
        </div>
        <div class="form-group">
            <label for="detail">书籍详情</label>
            <input type="text" name="detail" class="form-control" id="detail" required>
        </div>
        <button type="submit" class="btn btn-default">添加</button>
    </form>

</div>

</body>
</html>

3.方法二 添加书籍

//跳转到书籍添加页面
@RequestMapping("/toAddBook")
public String toAddBook(){
    return "addBook";
}

//添加书籍
@RequestMapping("/addBook")
public String addBook(Books books){
    System.out.println("addBook=>"+books);
    bookService.addBook(books);
    return "redirect:/books/allBooks";  //重定向到首页
}

4.新增书籍链接以及页面

跳转

<div class="col-md-4 column">
    <a class="btn btn-primary" href="${pageContext.request.contextPath}/books/toAddBook">新增书籍</a>
</div>

页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" >
</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————新增书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/books/addBook" method="post">
        <div class="form-group">
            <label for="bookName">书籍名称</label>
            <input type="text" name="bookName" class="form-control" id="bookName" required>
        </div>
        <div class="form-group">
            <label for="bookCounts">书籍数量</label>
            <input type="text" name="bookCounts" class="form-control" id="bookCounts" required>
        </div>
        <div class="form-group">
            <label for="detail">书籍详情</label>
            <input type="text" name="detail" class="form-control" id="detail" required>
        </div>
        <button type="submit" class="btn btn-default">添加</button>
    </form>

</div>

</body>
</html>

5、方法三 修改书籍

//跳转到修改页面
@RequestMapping("/toUpdateBook")
public String toUpdateBook(Integer id, Model model){
    System.out.println(id);
    Books books = bookService.queryBookById(id);
    model.addAttribute("qBook",books);
    return "updateBook";
}

//修改书籍
@RequestMapping("/updateBook")
public String updateBook(Books books){
    System.out.println("updateBook=>"+books);
    bookService.updateBook(books);
    return "redirect:/books/allBooks";
}

6、链接以及修改书籍页面

<a href="${pageContext.request.contextPath}/books/toUpdateBook?id=${book.bookId}">修改</a>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" >
</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————修改书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/books/updateBook" method="post">
        <%--id通过hidden传递--%>
        <input type="hidden" name="bookId" value="${qBook.bookId}">
        <div class="form-group">
            <label for="bookName">书籍名称</label>
            <input type="text" name="bookName" class="form-control" id="bookName" value="${qBook.bookName}" required>
        </div>
        <div class="form-group">
            <label for="bookCounts">书籍数量</label>
            <input type="text" name="bookCounts" class="form-control" id="bookCounts" value="${qBook.bookCounts}" required>
        </div>
        <div class="form-group">
            <label for="detail">书籍详情</label>
            <input type="text" name="detail" class="form-control" id="detail" value="${qBook.detail}" required>
        </div>
        <button type="submit" class="btn btn-default">修改</button>
    </form>

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

7、方法四 删除书籍

//删除书籍
@RequestMapping("/deleteBook")
public String deleteBook(Integer id){
    System.out.println("deleteBookId=>"+id);
    bookService.deleteBook(id);
    return "redirect:/books/allBooks";
}

8、删除链接

<a href="${pageContext.request.contextPath}/books/deleteBook?id=${book.bookId}">删除</a>

8、最终框架结构如下

技术图片

BookController:

@Controller
@RequestMapping("/books")
public class BookController {
    //Controller层调Service层

    @Autowired
    private BookService bookService;

    //books为空时 查询全部书籍,并返回一个显示所有书籍的页面
    //books.bookName有值时,模糊查询
    @RequestMapping("/allBooks")
    public String queryAllBooks(Books books,Model model){
        System.out.println(books);
        List<Books> booksList = bookService.queryAllBooks(books);
        model.addAttribute("booksList",booksList);
        return "allBooks";
    }

    //跳转到书籍添加页面
    @RequestMapping("/toAddBook")
    public String toAddBook(){
        return "addBook";
    }

    //添加书籍
    @RequestMapping("/addBook")
    public String addBook(Books books){
        System.out.println("addBook=>"+books);
        bookService.addBook(books);
        return "redirect:/books/allBooks";  //重定向到首页
    }

    //跳转到修改页面
    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(Integer id, Model model){
        System.out.println(id);
        Books books = bookService.queryBookById(id);
        model.addAttribute("qBook",books);
        return "updateBook";
    }

    //修改书籍
    @RequestMapping("/updateBook")
    public String updateBook(Books books){
        System.out.println("updateBook=>"+books);
        bookService.updateBook(books);
        return "redirect:/books/allBooks";
    }

    //删除书籍
    @RequestMapping("/deleteBook")
    public String deleteBook(Integer id){
        System.out.println("deleteBookId=>"+id);
        bookService.deleteBook(id);
        return "redirect:/books/allBooks";
    }
}

allBook.jsp:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>所有书籍记录</title>
    <%--bootStrap界面美化--%>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" >
</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="${pageContext.request.contextPath}/books/toAddBook">新增书籍</a>
            </div>
            <div class="col-md-4 column" style="float:right">
                <form action="${pageContext.request.contextPath}/books/allBooks" method="post" class="form-inline">
                    <input type="text" name="bookName" class="form-control" placeholder="请输入书籍名称">
                    <input type="submit" class="btn btn-primary" value="查询">
                </form>
            </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>
                    <%--书籍从数据库中查询出来,在list中遍历:foreach--%>
                    <tbody>
                    <c:forEach var="book" items="${booksList}">
                        <tr>
                            <td>${book.bookId}</td>
                            <td>${book.bookName}</td>
                            <td>${book.bookCounts}</td>
                            <td>${book.detail}</td>
                            <td>
                                <a href="${pageContext.request.contextPath}/books/toUpdateBook?id=${book.bookId}">修改</a>
                                &nbsp;|&nbsp;
                                <a href="${pageContext.request.contextPath}/books/deleteBook?id=${book.bookId}">删除</a>
                            </td>
                        </tr>
                    </c:forEach>
                    </tbody>
                </table>
            </div>
        </div>
    </div>

</body>
</html>

addBook.jsp:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" >
</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————新增书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/books/addBook" method="post">
        <div class="form-group">
            <label for="bookName">书籍名称</label>
            <input type="text" name="bookName" class="form-control" id="bookName" required>
        </div>
        <div class="form-group">
            <label for="bookCounts">书籍数量</label>
            <input type="text" name="bookCounts" class="form-control" id="bookCounts" required>
        </div>
        <div class="form-group">
            <label for="detail">书籍详情</label>
            <input type="text" name="detail" class="form-control" id="detail" required>
        </div>
        <button type="submit" class="btn btn-default">添加</button>
    </form>

</div>

</body>
</html>

updateBook.jsp:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" >
</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————修改书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/books/updateBook" method="post">
        <%--id通过hidden传递--%>
        <input type="hidden" name="bookId" value="${qBook.bookId}">
        <div class="form-group">
            <label for="bookName">书籍名称</label>
            <input type="text" name="bookName" class="form-control" id="bookName" value="${qBook.bookName}" required>
        </div>
        <div class="form-group">
            <label for="bookCounts">书籍数量</label>
            <input type="text" name="bookCounts" class="form-control" id="bookCounts" value="${qBook.bookCounts}" required>
        </div>
        <div class="form-group">
            <label for="detail">书籍详情</label>
            <input type="text" name="detail" class="form-control" id="detail" value="${qBook.detail}" required>
        </div>
        <button type="submit" class="btn btn-default">修改</button>
    </form>
</div>

</body>
</html>

界面演示:

技术图片

技术图片

技术图片

技术图片

9、小结

这里只实现了基本ssm框架的整合以及简单增删改查业务的实现

更加复杂的业务还等着我们去面临和解决

对于框架底层的学习还远远不够,学会多看底层代码,深入理解原理,对以后框架的优化会有极大帮助

可能出现的BUG处理:

为方便SQL语句bug的查询,可在mybatis配置setting开启日志

<!--开启日志-->
<setting name="logImpl" value="STDOUT_LOGGING"/>

1.在对数据库进行查询时出现异常

java.sql.SQLException: Access denied for user ‘Poison‘@‘localhost‘ (using password: YES)

经检查driver,url,username,password等内容都无错误

原来db.properties配置如下:

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
username=root
password=123456

网上查询后得知:配置数据库用户名username和Spring中默认的username字段名冲突,

<property name="username" value="${username}"/>

在这里${username}默认查询的是系统用户名,而不是db.properties中配置的username

于是为了防止重名,将db.properties中的变量名修改如下,问题解决

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

2.新增记录后刷新页面显示乱码

原因:web.xml中Filter的没有初始化encoding参数utf-8

由于CharacterEncodingFilter类的encoding属性允许为空,所以没有提示,一定要注意。

public class CharacterEncodingFilter extends OncePerRequestFilter {
    @Nullable
    private String encoding;

修改web.xml中Filter配置

<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>

SSM框架整合——基本增删改查业务的实现

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原文地址:https://www.cnblogs.com/spang/p/13494896.html

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