• 九、SpringMVC（3）

    文章目录

    一 、整合SSM

    最终整合结构参考 🌻🌻

    在这里插入图片描述

    1.1 环境要求

    （1）环境

    • IDEA
    • MySQL 5.7.19
    • Tomcat 9
    • Maven 3.6

    （2）要求

    • 需要熟练掌握MySQL数据库，Spring，JavaWeb及MyBatis知识，简单的前端知识；

    1.2 数据库环境

    • 创建一个存放书籍数据的数据库表
    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');

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    1.3 基本环境搭建

    1. 新建一Maven项目！ssmbuild ， 添加web的支持
    2. 导入相关的pom依赖！
    <dependencies>
   
   <dependency>
       <groupId>junitgroupId>
       <artifactId>junitartifactId>
       <version>4.12version>
   dependency>
   
   <dependency>
       <groupId>mysqlgroupId>
       <artifactId>mysql-connector-javaartifactId>
       <version>5.1.47version>
   dependency>
   
   <dependency>
       <groupId>com.mchangegroupId>
       <artifactId>c3p0artifactId>
       <version>0.9.5.2version>
   dependency>

   
   <dependency>
       <groupId>javax.servletgroupId>
       <artifactId>servlet-apiartifactId>
       <version>2.5version>
   dependency>
   <dependency>
       <groupId>javax.servlet.jspgroupId>
       <artifactId>jsp-apiartifactId>
       <version>2.2version>
   dependency>
   <dependency>
       <groupId>javax.servletgroupId>
       <artifactId>jstlartifactId>
       <version>1.2version>
   dependency>

   
   <dependency>
       <groupId>org.mybatisgroupId>
       <artifactId>mybatisartifactId>
       <version>3.5.2version>
   dependency>
   <dependency>
       <groupId>org.mybatisgroupId>
       <artifactId>mybatis-springartifactId>
       <version>2.0.2version>
   dependency>

   
   <dependency>
       <groupId>org.springframeworkgroupId>
       <artifactId>spring-webmvcartifactId>
       <version>5.1.9.RELEASEversion>
   dependency>
   <dependency>
       <groupId>org.springframeworkgroupId>
       <artifactId>spring-jdbcartifactId>
       <version>5.1.9.RELEASEversion>
   dependency>
   <dependency>
        <groupId>org.projectlombokgroupId>
        <artifactId>lombokartifactId>
        <version>1.18.24version>
   dependency>
dependencies>

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    1. Maven资源过滤设置
    <build>
   <resources>
       <resource>
           <directory>src/main/javadirectory>
           <includes>
               <include>**/*.propertiesinclude>
               <include>**/*.xmlinclude>
           includes>
           <filtering>falsefiltering>
       resource>
       <resource>
           <directory>src/main/resourcesdirectory>
           <includes>
               <include>**/*.propertiesinclude>
               <include>**/*.xmlinclude>
           includes>
           <filtering>falsefiltering>
       resource>
   resources>
build>

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    1. 建立基本结构和配置框架！👇🏾👇🏾
    • com.zql.pojo
    • com.zql.dao
    • com.zql.service
    • com.zql.controller
    • mybatis-config.xml 👇🏾👇🏾
    
DOCTYPE configuration
       PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
       "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

configuration>

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    • applicationContext.xml 👇🏾👇🏾
    
<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>

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    1.4 Mybatis 层编写

    1. 数据库配置文件 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=root

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    1. IDEA关联数据库
    2. 编写MyBatis的核心配置文件 👇🏾👇🏾
    
DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <typeAliases>
        <package name="com.zql.pojo"/>
    typeAliases>

    <mappers>
        <mapper class="com.zql.dao.BooksMapper"/>
    mappers>

configuration>

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    1. 编写数据库对应的实体类 com.zql.pojo.Books (使用lombok插件！)
    package com.zql.pojo;

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

import java.io.Serializable;

/**
 * @Author:Daniel
 * @Version 1.0
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Books implements Serializable {

    private int bookID;

    private String bookName;

    private int bookCounts;

    private String detail;
}

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    1. 编写Dao层的 Mapper接口！BooksMapper.java
    package com.zql.dao;

import com.zql.pojo.Books;
import org.apache.ibatis.annotations.Param;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.List;

/**
 * @Author:Daniel
 * @Version 1.0
 */
public interface BooksMapper {

    //增加一本书籍
    int addBooks(Books books);
    //删除一本书根据id
    int deleteBooksById(@Param("bookID") int bookID);
    //修改一本书
    int updateBooks(Books books);
    //根据id查询一本书
    Books queryById(@Param("bookID") int bookID);
    //查询所有的书
    List<Books> queryAllBooks();
    //根据书籍名称查询书籍
    Books queryByBookName(@Param("bookName") String bookName);
}

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    1. 编写接口对应的 Mapper.xml 文件；BooksMapper.xml
    
DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.zql.dao.BooksMapper">

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

    
    <delete id="deleteBooksById" parameterType="int">
        delete from ssmbuild.books where bookID=#{bookID}
    delete>

    
    <update id="updateBooks" parameterType="Books">
        update ssmbuild.books set
        bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail} where bookID=#{bookID}
    update>

   
    <select id="queryById" resultType="Books">
        select * from ssmbuild.books where bookID=#{bookID}
    select>
    
    <select id="queryAllBooks" resultType="Books">
        select * from ssmbuild.books;
    select>
    
    <select id="queryByBookName" resultType="Books">
        select * from ssmbuild.books where bookName=#{bookName}
    select>
mapper>

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    1. 编写Service层的接口和实现类

    接口 BooksService.java

    package com.zql.service;

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

import java.util.List;

/**
 * @Author:Daniel
 * @Version 1.0
 */
public interface BooksService {

    //增加一本书籍
    int addBooks(Books books);
    //删除一本书根据id
    int deleteBooksById(int bookID);
    //修改一本书
    int updateBooks(Books books);
    //根据id查询一本书
    Books queryById(int bookID);
    //查询所有的书
    List<Books> queryAllBooks();
    //根据书籍名称查询书籍
    Books queryByBookName(String bookName);
}

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    实现类 BooksServiceImpl.java

    package com.zql.service;

import com.zql.dao.BooksMapper;
import com.zql.pojo.Books;

import java.util.List;

/**
 * @Author:Daniel
 * @Version 1.0
 */
public class BooksServiceImpl implements BooksService {
    //调用dao层的操作，设置一个set接口，方便Spring管理
    private BooksMapper booksMapper;

    public void setBooksMapper(BooksMapper booksMapper) {
        this.booksMapper = booksMapper;
    }

    @Override
    public int addBooks(Books books) {
        return booksMapper.addBooks(books);
    }

    @Override
    public int deleteBooksById(int bookID) {
        return booksMapper.deleteBooksById(bookID);
    }

    @Override
    public int updateBooks(Books books) {
        return booksMapper.updateBooks(books);
    }

    @Override
    public Books queryById(int bookID) {
        return booksMapper.queryById(bookID);
    }

    @Override
    public List<Books> queryAllBooks() {
        return booksMapper.queryAllBooks();
    }
    @Override
    public Books queryByBookName(String bookName) {
        return booksMapper.queryByBookName(bookName);
    }
}

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    1.5 Spring 层编写

    1. 配置Spring整合MyBatis，我们这里数据源使用c3p0连接池；
    2. 我们去编写Spring整合Mybatis的相关的配置文件；spring-dao.xml
    
<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">

    
    
    <context:property-placeholder location="classpath:database.properties"/>
    
    
    <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}"/>
        
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        
        <property name="autoCommitOnClose" value="false"/>
        
        <property name="checkoutTimeout" value="10000"/>
        
        <property name="acquireRetryAttempts" value="2"/>
    bean>
    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        
        <property name="dataSource" ref="dataSource"/>
        
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    bean>

    
    
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        
        <context:component-scan base-package="com.zql.dao"/>
    bean>
beans>

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    1. Spring整合service层 spring-service.xml
    
<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">


    
    <context:component-scan base-package="com.zql.service"/>

    
    
    <bean id="BooksServiceImpl" class="com.zql.service.BooksServiceImpl">
        <property name="booksMapper" ref="booksMapper"/>
    bean>

    
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        
        <property name="dataSource" ref="dataSource"/>
    bean>

    

beans>

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    报红：👇🏾👇🏾

    在这里插入图片描述
    解决：👇🏾👇🏾

    方式一：

    spring-service.xml直接加 👇🏾👇🏾

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

    • 1

    方式二：
    在这里插入图片描述
    添加成功查看：👇🏾👇🏾
    在这里插入图片描述
    Spring层搞定！再次理解一下，Spring就是一个大杂烩，一个容器！对吧！

    1.6 SpringMVC 层编写

    1. web支持 👇🏾👇🏾

    在这里插入图片描述

    2. web.xml

    
<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">

    
    <servlet>
        <servlet-name>springmvcservlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
        <init-param>
            <param-name>contextConfigLocationparam-name>
            <param-value>classpath:spring-mvc.xmlparam-value>
        init-param>
        <load-on-startup>1load-on-startup>
    servlet>

    <servlet-mapping>
        <servlet-name>springmvcservlet-name>
        <url-pattern>/*url-pattern>
    servlet-mapping>

    
    <filter>
        <filter-name>encodingFilterfilter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
        <init-param>
            <param-name>encodingparam-name>
            <param-value>utf-8param-value>
        init-param>
    filter>
    <filter-mapping>
        <filter-name>encodingFilterfilter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>

    
    <session-config>
        <session-timeout>15session-timeout>
    session-config>
web-app>

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    1. spring-mvc.xml
    
<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">

    
    
    <mvc:annotation-driven/>
    
    <mvc:default-servlet-handler/>

    
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    bean>

    
    <context:component-scan base-package="com.zql.controller"/>
beans>

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    1. Spring配置整合文件，applicationContext.xml
    
<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>

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    1. 测试是否整合成功 👇🏾👇🏾

    创建 MyTest.java

    import com.zql.pojo.Books;
import com.zql.service.BooksService;
import com.zql.service.BooksServiceImpl;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

/**
 * @Author:Daniel
 * @Version 1.0
 */
public class MyTest {

    @Test
    public void test(){

        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

        BooksService booksServiceImpl = (BooksService) context.getBean("BooksServiceImpl");

        for (Books books : booksServiceImpl.queryAllBooks()) {

            System.out.println(books);
        }
    }
}

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    参考 👉🏾👉🏾 导入依赖并且启动tomcat

    在这里插入图片描述

    整合完毕 ！！！ ✌✌✌

    二、编写 CRUD

    Controller 和 视图层编写

    2.1 方法一：查询全部书籍

    1. BookController 类编写 BooksController.java
    package com.zql.controller;

import com.zql.pojo.Books;
import com.zql.service.BooksService;
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 org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * @Author:Daniel
 * @Version 1.0
 */

@Controller
@RequestMapping("/books")
public class BooksController {

    @Autowired
    @Qualifier("BooksServiceImpl")
    private BooksService booksService;

    @RequestMapping("/booksAll")
    public String queryAllBooks(Model model){

        List<Books> books = booksService.queryAllBooks();

        model.addAttribute("books",books);

        return "/allBooks";
    }
}


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    1. 编写首页 index.jsp
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
  </head>
  <body>
  <a href="${pageContext.request.contextPath}/books/booksAll">进入书籍页面</a>
  </body>
</html>

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    1. 书籍列表页面 WEB-INF/jsp/allBooks.jsp
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
书籍页面
</body>
</html>

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    启动tomcat 👇🏾👇🏾
    在这里插入图片描述

    分析：👇🏾👇🏾

    1. 查看这个bean注入是否成功！
    2. Junit单元测试，看我们的代码是否能够查询出来结果！ ok
    3. 问题，一定不在我们的底层，是spring出了问题！
    4. SpringMVC,整合的时候没调用到我们的service层的bean:
      – (1) applicationContext.xml没有注入bean
      – (2) web.xml中，我们绑定过配置文件，发现问题，我们配置的是spring-mvc.xml,这里确实没有 service bean,所以报空指针

    解决 （改动如下）：👇🏾👇🏾
    在这里插入图片描述

    再次启动tomcat 成功显示 👇🏾👇🏾

    在这里插入图片描述
    优化上述2&3页面👇🏾👇🏾

    1. 编写首页 index.jsp
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>首页</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}/books/booksAll">点击进入列表页面</a>
  </h3>
  </body>
</html>


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    1. 书籍列表页面 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>书籍列表</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>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/toAddPage">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>书籍编号</th>
                    <th>书籍名字</th>
                    <th>书籍数量</th>
                    <th>书籍详情</th>
                    <th>操作</th>
                </tr>
                </thead>

                <tbody>
                <c:forEach var="book" items="${books}"><%--方式二写法：requsestScope.get('books')--%>
                    <tr>
                        <td>${book.bookID}</td>
                        <td>${book.bookName}</td>
                        <td>${book.bookCounts}</td>
                        <td>${book.detail}</td>
                        <td>
                            <a href="${pageContext.request.contextPath}/books/toUpdatePage?bookID=${book.bookID}">更改</a>
                            <a href="${pageContext.request.contextPath}/books/deleteBooksById/${book.bookID}">删除</a>
                        </td>
                    </tr>
                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>
</body>
</html>

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    在这里插入图片描述

    2.2 方法二：添加书籍

    1. BookController 类编写
     //跳转到添加页面
 @RequestMapping("/toAddPage")
 public String toAddPage(){
     return "addBooks";
 }

 //添加书籍
 @RequestMapping("/addBooks")
 public String addBooks(Books books){

     booksService.addBooks(books);

     return "redirect:/books/booksAll";
 }

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    1. 添加书籍页面：WEB-INF/jsp/addBooks.jsp
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>
<head>
    <title>新增书籍</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>新增书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/books/addBooks" method="post">
        书籍名称：<input type="text" name="bookName"><br><br><br>
        书籍数量：<input type="text" name="bookCounts"><br><br><br>
        书籍详情：<input type="text" name="detail"><br><br><br>
        <input type="submit" value="添加">
    </form>
</div>

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    2.3 方法三：修改书籍

    1. BookController 类编写
    //跳转到修改页面并回显
@RequestMapping("/toUpdatePage")
public String toUpdatePage(Model model,int bookID){
    Books books = booksService.queryById(bookID);

    model.addAttribute("books",books);

    return "updateBooks";
}

//修改书籍
@RequestMapping("/updateBooks")
public String updateBooks(Model model,Books books){

    booksService.updateBooks(books);

    Books books1 = booksService.queryById(books.getBookID());

    model.addAttribute("books1",books1);
    return "redirect:/books/booksAll";
}

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    1. 修改书籍页面 WEB-INF/jsp/updateBooks.jsp
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改信息</title>
    <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>修改信息</small>
                </h1>
            </div>
        </div>
    </div>

    <form action="${pageContext.request.contextPath}/books/updateBooks" method="post">
        <input type="hidden" name="bookID" value="${books.bookID}"/>
        书籍名称：<input type="text" name="bookName" value="${books.bookName}"/><br/><br/>
        书籍数量：<input type="text" name="bookCounts" value="${books.bookCounts}"/><br/><br/>
        书籍详情：<input type="text" name="detail" value="${books.detail}"/><br/><br/>
        <input type="submit" value="提交"/>
    </form>

</div>

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    在这里插入图片描述

    2.4 方法四：删除书籍

    1. BookController 类编写
     //删除书籍
 @RequestMapping("/deleteBooksById/{bookID}")
 public String deleteBooksById(@PathVariable("bookID") int id){ //Restful风格

     booksService.deleteBooksById(id);

     return "redirect:/books/booksAll";
 }

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    在这里插入图片描述

    2.5 方法五：根据书籍名称查询书籍

    1. BookController 类编写
    	//根据书籍名称查询书籍
	@RequestMapping("/queryByBookName")
	public String queryByBookName(Model model,String queryByBookName){
	
		  Books books1 = booksService.queryByBookName(queryByBookName);
		
		  List<Books> books = new ArrayList<>();
		
		  books.add(books1);
		
		  if(books1 == null){
		      books = booksService.queryAllBooks();
		      model.addAttribute("msg","未查到");
		  }
		
		  model.addAttribute("books",books);
		
		  return "allBooks";
	}

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    1. 书籍列表页面 allbook.jsp
    <%--查询根据name--%>
<div class="col-md-4 column">
   <form class="navbar-form navbar-left" action="${pageContext.request.contextPath}/books/queryByBookName" method="post">
       <div class="form-group">
           <span style="color: red;font-weight: bold">${msg}</span>
           <input type="text" name="queryByBookName" class="form-control" placeholder="请输入要查询的书籍名称">
       </div>
       <button type="submit" class="btn btn-primary">查询</button>
   </form>
</div>

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    完整代码：👇🏾👇🏾

    <%@ 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>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="${pageContext.request.contextPath}/books/toAddPage">新增</a>
        </div>
        <%--查询根据name--%>
        <div class="col-md-4 column">
            <form class="navbar-form navbar-left" action="${pageContext.request.contextPath}/books/queryByBookName" method="post">
                <div class="form-group">
                    <span style="color: red;font-weight: bold">${msg}</span>
                    <input type="text" name="queryByBookName" class="form-control" placeholder="请输入要查询的书籍名称">
                </div>
                <button type="submit" class="btn btn-primary">查询</button>
            </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>书籍名字</th>
                    <th>书籍数量</th>
                    <th>书籍详情</th>
                    <th>操作</th>
                </tr>
                </thead>

                <tbody>
                <c:forEach var="book" items="${books}"><%--方式二写法：requsestScope.get('books')--%>
                    <tr>
                        <td>${book.bookID}</td>
                        <td>${book.bookName}</td>
                        <td>${book.bookCounts}</td>
                        <td>${book.detail}</td>
                        <td>
                            <a href="${pageContext.request.contextPath}/books/toUpdatePage?bookID=${book.bookID}">更改</a>
                            <a href="${pageContext.request.contextPath}/books/deleteBooksById/${book.bookID}">删除</a>
                        </td>
                    </tr>
                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>
</body>
</html>

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    启动tomcat 👇🏾👇🏾
    在这里插入图片描述
    在这里插入图片描述

    项目结构图

    在这里插入图片描述
    在这里插入图片描述

    SpringMVC案例所有源码

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  • 原文地址：https://blog.csdn.net/weixin_42171159/article/details/126017591