整合SSM

创建数据库表

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');

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.kuang</groupId>
    <artifactId>ssmbuild2</artifactId>
    <version>1.0-SNAPSHOT</version>
<!--依赖： junit   数据库驱动   连接池   servlet  jsp  mybatis-spring  spring  -->
<dependencies>
    <dependency>
<!--        junit-->
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>

<!--    数据库驱动-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.23</version>
    </dependency>
<!--    数据库连接池 c3p0  :dbcp-->
    <dependency>
        <groupId>com.mchange</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.5.5</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>3.5.6</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.6</version>
    </dependency>
    <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>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.6</version>
    </dependency>

<!--    Lombok-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.12</version>
    </dependency>
</dependencies>
<!--    静态资源导出问题-->
    <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>
</project>

连接数据库：

注意URL处要填写:jdbc:mysql://localhost:3306/?serverTimezone=GMT

resultType是执行完sql的返回类型， 返回数据类型为基本类型时，会自动封装

resources

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


</beans>

database.properties

jdbc.driver=com.mysql.jdbc.Driver
# 如果使用的是Mysql8.0+需要增加一个时区的配置 &serverTimezone=Asia/Shanghai   但是在连接数据库测试时就加了时区 所有我觉得这里可以不加  不会出错的
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

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>
<!--配置数据源，交给Spring去做-->
    <typeAliases>
        <package name="com.kuang.pojo"/>
    </typeAliases>
<!--两个名字一样用class定位  不一样用resources定位-->
    <mappers>
        <mapper class="com.kuang.dao.BookMapper"/>
    </mappers>
</configuration>

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
       http://www.springframework.org/schema/context/spring-context.xsd">
<!--1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:database.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连接池的私有属性 -->
    <property name="maxPoolSize" value="30"/>
    <property name="minPoolSize" value="10"/>
    <!-- 关闭连接后不自动commit -->
    <property name="autoCommitOnClose" value="false"/>
    <!-- 获取连接超时时间 10秒-->
    <property name="checkoutTimeout" value="10000"/>
    <!-- 当获取连接失败重试次数 -->
    <property name="acquireRetryAttempts" value="2"/>
</bean>



<!--    3.sqlSessionFactory   使用 ref 去引用上面-->
    <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，动态的实现了Dao接口可以注入到Spring容器中
sqlSessionFactoryBeanName 继承
sqlSessionTemplateBeanName 私有化-->
    <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.kuang.dao"/>
    </bean>
</beans>

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
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--1.注解驱动-->
    <mvc:annotation-driven/>

<!--    2.静态资源过滤-->
    <mvc:default-servlet-handler/>
<!--    3，扫描包：controller-->
    <context:component-scan base-package="com.kuang.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>

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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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/aop
   http://www.springframework.org/schema/aop/spring-aop.xsd
   http://www.springframework.org/schema/tx
   http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--    1.扫描service下的包-->
    <context:component-scan base-package="com.kuang.service"/>
<!--  2.将我们的所有的业务类，注入到Spring,可以通过配置，或者注解实现
           ref代表引用
-->
<bean id=" BookServiceImpl" class="com.kuang.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-->
<!--    结合aop实现事务织入-->
<!-- 配置事务通知   -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
<!--给那些方法配置事务-->
<!--        配置事务的传播特性:new propagation
REQUIRED  没有事务给它添加事务-->
        <tx:attributes>

            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>
<!--配置事务切入-->
    <aop:config>
        <aop:pointcut id="txPointCut" expression="execution(* com.kuang.dao.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>



</beans>

出现的错误：Cannot find bean with qualifier 'BookServiceImpl'

解决办法：

出现的问题：Field injection is not recommended 就是不推荐使用@Autowired注解 所以改成了下面这样的形式 但是使用这个注解也可以实现

BookController

package com.kuang.controller;

import com.kuang.pojo.Books;
import com.kuang.service.BookService;


import com.kuang.service.BookServiceImpl;
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.ArrayList;
import java.util.List;

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

    private final BookService bookService;

    public BookController(@Qualifier("BookServiceImpl") BookService bookService) {
        this.bookService = bookService;
    }

    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list", list);
        return "allBook";
    }
    //跳转到增加书籍的页面
    @RequestMapping("/toAddBook")
    public String toAddPaper(){
        return "addBook";

    }
    //添加书籍请求
    @RequestMapping("/addBook")
    public String addBook(Books books){
        System.out.println("addBook=>" + books);
        bookService.addBook(books);
        return "redirect:/book/allBook"; //重定向我们的 @RequestMapping("/allBook")请求


    }

    //跳转到修改页面
    @RequestMapping("/toUpdate")
    public String toUpdatePaper(int id, Model model){
        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);
        //调业务层修改
        int i = bookService.updateBook(books);
        if(i>0){
            System.out.println("添加books成功"+books);
        }
        //修改完应该要重定向到首页
        return "redirect:/book/allBook";
    }

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

    //查询书籍
    @RequestMapping("/queryBook")
    public String queryBook(String queryBookName,Model model){
        Books books = bookService.queryBookByName(queryBookName);
        System.err.println("queryBook=>"+books);
        List<Books> list = new ArrayList<Books>();
        //只传回一本书
        list.add(books);

        if (books==null){
            list = bookService.queryAllBook();
            model.addAttribute("error","未查到");
        }
        model.addAttribute("list",list);
        return "allBook";
    }


}

dao

BookMapper

package com.kuang.dao;

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

import java.util.List;

public interface BookMapper {
    //增加一本书
    int addBook(Books books);
    //删除一本书
    int deleteBookById(@Param("bookId") int id);
    //更新一本书
    int updateBook(Books books);

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

    //查询全部书籍
    List<Books> queryAllBook();

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


}

BookMapper.xml

<?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.kuang.dao.BookMapper">
     <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books(bookName, bookCounts, detail)
        values (#{bookName},#{bookCounts},#{detail});
     </insert>
    
    <delete id="deleteBookById" parameterType="int">
        delete from ssmbuild.books where bookID = #{bookId}
    </delete>
    
    <update id="updateBook" parameterType="Books">
        update ssmbuild.books
set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
where bookID=#{bookID};
  </update>
    
    <select id="queryBookById" resultType="Books" parameterType="int">
        select * from ssmbuild.books
        where bookID = #{bookId}
    </select>

    <select id="queryAllBook" resultType="Books">
        select * from ssmbuild.books
    </select>
    
    <select id="queryBookByName" resultType="Books">
    select * from  ssmbuild.books where bookName = #{bookName}
    </select>


    
</mapper>

pojo

package com.kuang.pojo;

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

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;


}

service

BookService

package com.kuang.service;

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


import java.util.List;

public interface BookService {
    //增加一本书
    int addBook(Books books);
    //删除一本书
    int deleteBookById(int id);
    //更新一本书
    int updateBook(Books books);

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

    //查询全部书籍
    List<Books> queryAllBook();

    Books queryBookByName(String bookName);

}

BookServiceImpl

package com.kuang.service;

import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;

import java.util.List;

public class BookServiceImpl implements BookService{

    //业务层调dao层  service 调dao
    //组合dao
   private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }
//业务层调dao层   service 层处理事务
    public int addBook(Books books) {
        return bookMapper.addBook(books);
    }

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

    public int updateBook(Books books) {
        //不提交事务修改会失败
        System.out.println("BookServiceImpl:updateBook=>"+books);
        return bookMapper.updateBook(books);
    }

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

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

    public Books queryBookByName(String bookName) {
        return bookMapper.queryBookByName(bookName);
    }
}

test

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);
        }
    }
}

WEB-INF

jsp

addBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
    <%--    BootStrap 美化界面--%>
    <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">
            <div class="page-header">
                <h1>
                    <small>新增书籍</small>
                </h1>
            </div>
        </div>

    </div>
<%--    required必须写完整才可以提交--%>
    <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" required>
        </div>
    </form>
</div>

</body>
</html>

allBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示</title>
<%--    BootStrap 美化界面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<%--栅格--%>
<div class="container">
<%--    清除浮动--%>
<div class="row clearfix">
<%--    把屏幕分成12份--%>
    <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>
<%--    row  使它一行12列--%>
    <div class="row">
        <div class="col-md-4 column">
<%--            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 column">
            <%--            a标签是不能通过查询的--%>
<%--            查询书籍--%>
            <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" 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>
    <div class="row clearfix">
        <div class="col-md-12 column">
<%--            table-hover上下变色 table-striped 有格子--%>
           <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，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="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a>
                           &nbsp; | &nbsp;
                           <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                       </td>
                   </tr>
               </c:forEach>

               </tbody>

           </table>

        </div>
    </div>
</div>

</body>
</html>

updateBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>
    <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">
            <div class="page-header">
                <h1>
                    <small>修改书籍</small>
                </h1>
            </div>
        </div>

    </div>
    <%--    required必须写完整才可以提交--%>
    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
<%--        出现的问题：我们提交了修改的SQL请求，但是修改失败，初次考虑，是事务问题，配置完毕事务  依旧失败 --%>
<%--        看一下SQL语句，能否执行成功 SQL执行失败  修改未完成--%>
<%--    前端传递隐藏域--%>
    <input type="hidden" name="bookID" value="${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>

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>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>
<!--Session-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>

</web-app>

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>首页</title>
    <style>
      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: 5px;


      }
    </style>
  </head>
  <body>
<h3>
  <a href="${pageContext.request.contextPath}/book/allBook">进入书籍展示页面</a>
</h3>
  </body>
</html>