标签:label orm struct linu figure 适配器 ret pat 图解
创建一个数据库表
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‘);
新建Maven项目,ssmbuild,添加web的支持(生成最新的 web.xml 文件)
导入相关的 pom 依赖 pom.xml
junit,数据库驱动,连接池,servlet,jsp,mybatis,mybatis-spring,spring,Lombok插件
<!--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>4.12</version>
</dependency>
<!--数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!-- 数据库连接池: c3p0、dbcp -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<!--Servlet - JSP -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!--Mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.2</version>
</dependency>
<!--Spring-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.13</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.10</version>
<scope>provided</scope>
</dependency>
</dependencies>
Maven 资源过滤设置
<!--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>
建立基本结构和配置框架
com.song.pojo
com.song.dao
com.song.service
com.song.controller
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
</configuration>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>
数据库配置文件 database.properties
jdbc.driver=com.mysql.jdbc.Driver
# 如果使用的是 MySQL8.0+,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
jdbc.username=root
jdbc.password=root
IDEA关联数据库
编写 MyBatis 的核心配置文件 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>
<!-- 配置数据源交给 Spring 做-->
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>
<typeAliases>
<package name="com.song.pojo"/>
</typeAliases>
<mappers>
<mapper class="com.song.dao.BookMapper"/>
</mappers>
</configuration>
编写数据库对应的实体类 com.kuang.pojo.Books (使用lombok插件)
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Books {
private int bookID;
private String bookName;
private int bookCounts;
private String detail;
}
编写 Dao 层的 Mapper 接口
public interface BookMapper {
//增加一本书
int addBook(Books books);
//根据 id 删除一本书
int deleteBookById(@Param("bookId") int id);
//更新一本书
int updateBook(Books books);
//根据 id 查询一本书
Books queryBookById(@Param("bookId") int id);
//查询全部书
List<Books> queryAllBooks();
//根据 name 查询一本书
Books queryBookByName(@Param("bookName") String bookName);
}
编写接口对应的 Mapper.xml 文件 BookMapper.xml
需要配置到 MyBatis 的核心配置文件中
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.song.dao.BookMapper">
<!--增加一个Book-->
<insert id="addBook" parameterType="Books">
insert into ssmbuild.books (bookName, bookCounts, detail)
values (#{bookName}, #{bookCounts}, #{detail});
</insert>
<!--根据id删除一个Book-->
<delete id="deleteBookById" parameterType="_int">
delete from ssmbuild.books
where bookID = #{bookId}
</delete>
<!--更新Book-->
<update id="updateBook" parameterType="Books">
update ssmbuild.books
set bookName = #{bookName}, bookCounts = #{bookCounts}, detail = #{detail}
where bookID = #{bookID};
</update>
<!--根据id查询,返回一个Book-->
<select id="queryBookById" resultType="Books">
select * from ssmbuild.books
where bookID = #{bookId};
</select>
<!--查询全部Book-->
<select id="queryAllBooks" resultType="Books">
select * from ssmbuild.books;
</select>
<!--根据name查询,返回一个Book-->
<select id="queryBookByName" resultType="Books">
select * from ssmbuild.books where bookName = #{bookName};
</select>
</mapper>
编写 Service 层的接口和实现类
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
List<Books> queryAllBooks();
Books queryBookByName(String bookName);
}
public class BookServiceImpl implements BookService {
// Service 调用 dao层: 把 dao 层组合进来
private BookMapper bookMapper;
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
public int addBook(Books books) {
return bookMapper.addBook(books);
}
public int deleteBookById(int id) {
return bookMapper.deleteBookById(id);
}
public int updateBook(Books books) {
return bookMapper.updateBook(books);
}
public Books queryBookById(int id) {
return bookMapper.queryBookById(id);
}
public List<Books> queryAllBooks() {
return bookMapper.queryAllBooks();
}
public Books queryBookByName(String bookName) {
return bookMapper.queryBookByName(bookName);
}
}
Spring 整合 Mybatis 的相关的配置文件 spring-dao.xml,这里的数据源使用 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
http://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: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:springboot 2.x 默认集成
-->
<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 -->
<property name="checkoutTimeout" value="10000"/>
<!-- 当获取连接失败重试次数 -->
<property name="acquireRetryAttempts" value="2"/>
</bean>
<!--3. SqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--绑定配置文件-->
<property name="configLocation" value="classpath:mabatis-config.xml"/>
</bean>
<!--4. 配置 dao 接口扫描包,动态的实现了 Dao接口可以接入到 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.song.dao"/>
</bean>
</beans>
Spring 整合 service 层 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
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
https://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.song.service"/>
<!--2. 将所有的业务类注入到 spring-->
<bean id="BookServiceImpl" class="com.song.service.BookServiceImpl">
<property name="bookMapper" ref="bookMapper"/>
</bean>
<!--3. 声明式事务-->
<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,实现事务的织入-->
<!--配置事务通知-->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<!--给哪些方法配置事务-->
<!--配置事务的传播特性 propagation-->
<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.song.dao.*.*(..))"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
</aop:config>
</beans>
**web.xml **中配置 DispatcherServlet 和乱码过滤
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--DispatcherServlet-->
<servlet>
<servlet-name>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 过期时间-->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
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: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/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd">
<!--1.开启SpringMVC注解驱动-->
<mvc:annotation-driven/>
<!--2.静态资源过滤-->
<mvc:default-servlet-handler/>
<!--3.扫描包:controller(扫描web相关的bean)-->
<context:component-scan base-package="com.song.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 配置整合文件,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
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>
配置文件结束,接下来要进行 Controller 和视图层编写,实现功能
编写 BookController 类
@Controller
@RequestMapping("/book")
public class BookController {
// Controller调service层
@Autowired
@Qualifier("BookServiceImpl")
private BookService bookService;
// 查询全部的书籍
@RequestMapping("/allBook")
public String list(Model model){
List<Books> list = bookService.queryAllBooks();
model.addAttribute("list", list);
return "allBook"; // localhost:8080/book/allBook.jsp
}
}
编写首页 index.jsp
点击首页的超链接 进入书籍页面 ,DispatcherServlet 会接收并拦截这个超链接的 url,通过 SpringMVC 中的处理器映射器和适配器,BookController 根据 /book/allBook 执行 list() 方法,进行业务处理并返回模型数据,最后通过视图解析器渲染视图,将结果显示在 allBook.jsp 页面
<%@ 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;
heigh: 38px;
margin: 100px auto;
text-align: center;
line-height: 38px;
background: deepskyblue;
border-radius: 5px;
}
</style>
</head>
<body>
<h3>
<a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a>
</h3>
</body>
</html>
查询全部书籍后跳转到的页面 allBook.jsp,会将 Controller 中的 list 遍历出来放到一个表格中
使用 Bootstrap 美化界面
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>书籍展示页面</title>
<%--Bootstrap美化界面--%>
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row clearfix">
<div class="col-md-12 column">
<div class="page-header">
<h1>
<small>书籍列表 —————— 显示所有书籍</small>
</h1>
</div>
</div>
<div class="row">
<div class="col-md-4 column">
<%--toAddBook--%>
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a>
</div>
<div class="col-md-4 column"></div>
<div class="col-md-4 column">
<%--查询书籍--%>
<form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float:right" class="form-inline">
<span style="color:red;font-weight:bold">${error}</span>
<input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的书籍名称">
<input type="submit" value="查询" class="btn btn-primary">
</form>
</div>
</div>
</div>
<div class="row clearfix">
<div class="col-md-12 column">
<table class="table table-hover table-striped">
<thead>
<tr>
<th>书籍编号</th>
<th>书籍名称</th>
<th>书籍数量</th>
<th>书籍详情</th>
<th>操作</th>
</tr>
</thead>
<%--书籍从数据库查询出来,从list中遍历出来:foreach--%>
<tbody>
<c:forEach var="book" items="${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>
|
<a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
</td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
</div>
</div>
</body>
</html>
前面的 BookController 类中添加【跳转到增加书籍页面】和【添加书籍的请求】的方法。
在 allBook.jsp 页面添加一个 新增书籍 超链接,点击这个按钮之后根据请求路径 /book/toAddBook 跳转到 addBook.jsp 界面。
添加完书籍之后,根据请求路径 /book/addBook 会重定向到 显示全部书籍 allBook.jsp 页面。
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
// 跳转到增加书籍页面
@RequestMapping("/toAddBook")
public String toAddPage(){
return "addBook";
}
// 添加书籍的请求
@RequestMapping("/addBook")
public String addBook(Books books){
System.out.println("addBook=>"+ books);
bookService.addBook(books);
return "redirect:/book/allBook"; //重定向到@RequestMapping("/allBook")请求
}
添加书籍页面:addBook.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
<%--Bootstrap美化界面--%>
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row clearfix">
<div class="col-md-12 column">
<div class="page-header">
<h1>
<small>新增书籍</small>
</h1>
</div>
</div>
</div>
<form action="${pageContext.request.contextPath}/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>书籍详情:</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>
前面的 BookController 类中添加【跳转到修改书籍页面】和【修改书籍的请求】的方法。
在 allBook.jsp 页面的表格中添加一列【操作】的选项,每一行有【修改和删除】的超链接,点击之后会对某个对象进行相应操作。
对于【修改】操作,点击之后根据 /book/toUpdate 跳转到修改页面 updateBook.jsp。注意:要在点击按钮时自动获取 bookID 参数,并将其作为请求参数传入控制器,这样,可以根据 bookID 查询出对应书籍的信息显示在修改页面。
修改后根据请求 /book/updateBook 会将新的 book 对象传入 updateBook,该方法会调用业务层和 dao 层的 update 方法和数据库进行交互,执行完这些操作后重定向到 allBook.jsp
<th>操作</th>
<td>
<a href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a>
|
<a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
</td>
// 跳转到修改页面
@RequestMapping("/toUpdate")
public String toUpdatePage(int id, Model model){
Books books = bookService.queryBookById(id);
model.addAttribute("QBooks",books); // QBooks信息会显示在前端
return "updateBook";
}
// 修改书籍
@RequestMapping("/updateBook")
public String updateBook(Books books){ // 前端修改后的数据传入
System.out.println("updateBook=>" + books);
int i = bookService.updateBook(books);
if(i>0){
System.out.println("添加books成功" + books);
}
return "redirect:/book/allBook";
}
修改书籍页面 updateBook.jsp
注意:别忘了传递 bookID,否则会传递 bookID=0 修改不成功
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>修改书籍</title>
<%--Bootstrap美化界面--%>
<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>修改书籍</small>
</h1>
</div>
</div>
</div>
<form action="${pageContext.request.contextPath}/book/updateBook" method="post">
<%--出现的问题:提交了修改的SQL请求,但是修改失败,初次考虑是事务问题,配置完毕,依旧失败
看SQL语句能否执行成功:SQL执行失败,修改未完成--%>、、
<%--前端传递隐藏域--%>
<input type="hidden" name="bookID" value="${QBooks.bookID}">
<div class="form-group">
<label>书籍名称:</label>
<input type="text" name="bookName" class="form-control" value="${QBooks.bookName}" required>
</div>
<div class="form-group">
<label>书籍数量:</label>
<input type="text" name="bookCounts" class="form-control" value="${QBooks.bookCounts}" required>
</div>
<div class="form-group">
<label>书籍详情:</label>
<input type="text" name="detail" class="form-control" value="${QBooks.detail}" required>
</div>
<div class="form-group">
<input type="submit" class="form-control" value="修改">
</div>
</form>
</div>
</body>
</html>
allBook.jsp 页面添加删除的超链接,点击之后会发送 /book/deleteBook/${book.bookID} 请求
<a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
前面的 BookController 类中添加【根据 id 删除书籍】的方法。
该方法接收到请求参数,调用 service 和 dao 层执行删除操作,最后重定向到 allBook.jsp
// 删除书籍 这里使用了RestFul风格
@RequestMapping("/deleteBook/{bookId}")
public String deleteBook(@PathVariable("bookId") int id){
bookService.deleteBookById(id);
return "redirect:/book/allBook";
}
在 allBook.jsp 页面添加一个 form 表单,输入书籍名称后点击查询会发送 /book/queryBook 请求,Controller 会根据这个请求做出相应处理。
<%--查询书籍--%>
<form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float:right" class="form-inline">
<span style="color:red;font-weight:bold">${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>
前面的 BookController 类中添加【根据名称查询书籍】的方法。
查询完成之后转发到 allBook.jsp 页面,输入为空或者输入不匹配会显示“未查到”,仍显示全部书籍。
// 查询书籍
@RequestMapping("/queryBook")
public String queryBook(String queryBookName, Model model){
Books books = bookService.queryBookByName(queryBookName);
List<Books> list = new ArrayList<Books>();
list.add(books);
//查询优化
if(books == null){
list = bookService.queryAllBooks();
model.addAttribute("error", "未查到");
}
model.addAttribute("list", list);
return "allBook";
}
index.jsp
allBook.jsp
addBook.jsp
updateBook.jsp
要确保 IDEA 的项目发布中,添加 lib 依赖,否则会出现 404 错误
要确保 Tomcat 服务器中部署了项目
服务器使用说明
标签:label orm struct linu figure 适配器 ret pat 图解
原文地址:https://www.cnblogs.com/Songzw/p/13192529.html