Linux使用者管理之管理配置檔案講解
阿新 • • 發佈:2020-08-10
整合SSM框架
一、環境配置
軟體版本
- IDEA
- MySQL 5.7.19
- Tomcat 9
- Maven 3.6
資料庫環境
建立一個存放書籍資料的資料庫表
CREATE DATABASE `ssmbuild`; USE `ssmbuild`; DROP TABLE IF EXISTS `books`; CREATE TABLE `books` ( `bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '書id', `bookName` VARCHAR(100) NOT NULL COMMENT '書名', `bookCounts` INT(11) NOT NULL COMMENT '數量', `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,'從入門到放棄'), (2,'MySQL',10,'從刪庫到跑路'), (3,'Linux',5,'從進門到進牢');
排錯思路
寫程式碼難免遇到各種 bug ,下面是一些問題的解決思路
-
問題一 500錯誤:bean 不存在
-
- 檢視這個 bean 注入是否成功
-
- Junit 單元測試,看程式碼是否能夠查詢出結果
-
在 test 中新建一個測試類(假設檢視idea的output,發現找不到bean:service中的BookService)
-
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); } } }
-
- 若第二步成功,則說明問題不在底層,是Spring出了問題
-
- SpringMVC 整合時,沒有呼叫service層的bean
- 可能applicationContext.xml 沒有注入bean
- 可能web.xml 中,繫結的配置檔案有問題,要確定裡面有service層的bean
-
基本環境搭建
- 新建一個 maven 的 web 專案
- 匯入相關的依賴
<dependencies> <!--Junit--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <!--資料庫驅動--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <!-- 資料庫連線池 --> <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>3.5.2</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> </dependencies>
- Maven資源過濾設定
<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>
- 連線資料庫
- 建立基本結構和配置框架
建立目錄
- com.kuang.pojo
- com.kuang.dao
- com.kuang.service
- com.kuang.controller
編寫MyBatis配置檔案框架(如: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>
編寫 Spring 的配置檔案 (如: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">
</beans>
Mybatis 層編寫
- 編寫資料庫配置檔案(如: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=123456
- 編寫MyBatis的核心配置檔案(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>
<!--匯入properties 配置檔案,配置資料來源的工作交給Spring完成-->
<!-- 類型別名 -->
<typeAliases>
<package name="com.kuang.pojo"/>
</typeAliases>
<!--Mybatis的mapper註冊,定義 SQL 對映語句-->
<mappers>
<mapper resource="com/kuang/dao/BookMapper.xml"/>
</mappers>
</configuration>
- 編寫資料庫對應的實體類( com.kuang.pojo.Books)
package com.kuang.pojo;
public class Books {
private int bookID;
private String bookName;
private int bookCounts;
private String detail;
// getter,setter,構造方法,toString
}
- 編寫Dao層的 Mapper介面
package com.kuang.dao;
import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface BookMapper {
//增加一個Book
int addBook(Books book);
//根據id刪除一個Book
int deleteBookById(int id);
//更新Book
int updateBook(Books books);
//根據id查詢,返回一個Book
Books queryBookById(int id);
//查詢全部Book,返回list集合
List<Books> queryAllBook();
}
- 編寫介面對應的 Mapper.xml 檔案。需要匯入MyBatis的包
在Dao目錄下編寫BookMapper.xml
<?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.kuang.dao.BookMapper">
<!--增加一個Book-->
<insert id="addBook" parameterType="Books">
insert into ssmbuild.books(bookName,bookCounts,detail)
values (#{bookName}, #{bookCounts}, #{detail})
</insert>
<!--根據id刪除一個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>
<!--根據id查詢,返回一個Book-->
<select id="queryBookById" resultType="Books">
select * from ssmbuild.books
where bookID = #{bookID}
</select>
<!--查詢全部Book-->
<select id="queryAllBook" resultType="Books">
SELECT * from ssmbuild.books
</select>
</mapper>
<!-- 寫完後在MyBatis配置檔案裡註冊 -->
- 編寫Service層的介面和實現類
介面
package com.kuang.service;
import com.kuang.pojo.Books;
import java.util.List;
//BookService:底下需要去實現,呼叫dao層
public interface BookService {
//增加一個Book
int addBook(Books book);
//根據id刪除一個Book
int deleteBookById(int id);
//更新Book
int updateBook(Books books);
//根據id查詢,返回一個Book
Books queryBookById(int id);
//查詢全部Book,返回list集合
List<Books> queryAllBook();
}
實現類
package com.kuang.service;
import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;
import java.util.List;
public class BookServiceImpl implements BookService {
//呼叫dao層的操作,設定一個set介面,方便Spring管理
private BookMapper bookMapper;
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
public int addBook(Books book) {
return bookMapper.addBook(book);
}
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> queryAllBook() {
return bookMapper.queryAllBook();
}
}
到這裡,底層需求操作編寫好了
Spring層編寫
- 配置Spring整合MyBatis,這裡資料來源使用 c3p0 連線池
- 編寫Spring整合Mybatis的相關的配置檔案;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
https://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置整合mybatis -->
<!-- 1.關聯資料庫檔案,下面是專門匯入資料庫檔案 -->
<context:property-placeholder location="classpath:database.properties"/>
<!-- 2.資料庫連線池 -->
<!--資料庫連線池
dbcp 半自動化操作 不能自動連線
c3p0 自動化操作(自動的載入配置檔案 並且設定到物件裡面)
-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!-- 配置連線池屬性 -->
<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連線池的私有屬性 -->
<property name="maxPoolSize" value="30"/>
<property name="minPoolSize" value="10"/>
<!-- 關閉連線後不自動commit -->
<property name="autoCommitOnClose" value="false"/>
<!-- 獲取連線超時時間 -->
<property name="checkoutTimeout" value="10000"/>
<!-- 當獲取連線失敗重試次數 -->
<property name="acquireRetryAttempts" value="2"/>
</bean>
<!-- 3.配置SqlSessionFactory物件 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入資料庫連線池 -->
<property name="dataSource" ref="dataSource"/>
<!-- 繫結MyBaties全域性配置檔案:mybatis-config.xml -->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!-- 4.配置掃描Dao介面包,動態實現Dao介面注入到spring容器中 -->
<!--解釋 :https://www.cnblogs.com/jpfss/p/7799806.html-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 注入sqlSessionFactory -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 給出需要掃描Dao介面包 -->
<property name="basePackage" value="com.kuang.dao"/>
</bean>
</beans>
- Spring整合service層(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"
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.掃描service下的包 -->
<context:component-scan base-package="com.kuang.service" />
<!-- 2.將所有業務類注入到 Spring,可以通過配置或註解實現 -->
<!--BookServiceImpl注入到IOC容器中-->
<bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl">
<property name="bookMapper" ref="bookMapper"/>
</bean>
<!-- 3.配置事務管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 注入資料來源 -->
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 4.aop事務支援,需要時可加 -->
</beans>
Spring層完成!再次理解一下,Spring就是一個大雜燴,一個容器
SpringMVC層編寫
- 增加 Web 的支援,配置web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--DispatcherServlet-->
<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<!--一定要注意:我們這裡載入的是總的配置檔案,之前被這裡坑了!-->
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--encodingFilter,亂碼過濾-->
<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>
<!--為了安全起見,設定Session過期時間-->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
- 配置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
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 配置SpringMVC -->
<!-- 1.開啟SpringMVC註解驅動 -->
<mvc:annotation-driven />
<!-- 2.靜態資源預設servlet配置,靜態資源過濾-->
<mvc:default-servlet-handler/>
<!-- 3.檢視解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- 4.掃描web相關的bean。掃描包:controller -->
<context:component-scan base-package="com.kuang.controller" />
</beans>
- Spring配置整合檔案(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="spring-dao.xml"/>
<import resource="spring-service.xml"/>
<import resource="spring-mvc.xml"/>
</beans>
到這裡,配置檔案就暫時結束了,後面可以加業務。下面寫一個例子
二、業務程式碼編寫
Controller 和 檢視層編寫
- BookController 類編寫 ,方法一:查詢全部書籍
package com.kuang.controller;
import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
@Controller
@RequestMapping("/book")
public class BookController {
@Autowired
@Qualifier("BookServiceImpl")
private BookService bookService;
// 查詢全部書籍,並且返回到一個書籍展示頁面
@RequestMapping("/allBook")
public String list(Model model) {
List<Books> list = bookService.queryAllBook();
model.addAttribute("list", list);
return "allBook";
}
}
- 編寫首頁 (index.jsp)
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE HTML>
<html>
<head>
<title>首頁</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="${pageContext.request.contextPath}/book/allBook">點選進入列表頁</a>
</h3>
</body>
</html>
- 編寫書籍列表頁面 (allBook.jsp)
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>書籍列表</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- 引入 Bootstrap -->
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row clearfix">
<div class="col-md-12 column">
<div class="page-header">
<h1>
<small>書籍列表 —— 顯示所有書籍</small>
</h1>
</div>
</div>
</div>
<div class="row">
<div class="col-md-4 column">
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">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>書籍編號</th>
<th>書籍名字</th>
<th>書籍數量</th>
<th>書籍詳情</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<c:forEach var="book" items="${requestScope.get('list')}">
<tr>
<td>${book.getBookID()}</td>
<td>${book.getBookName()}</td>
<td>${book.getBookCounts()}</td>
<td>${book.getDetail()}</td>
<td>
<a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">更改</a> |
<a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}">刪除</a>
</td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
</div>
</div>
新增功能
- BookController 類編寫 , 方法二:新增書籍
package com.kuang.controller;
import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
@Controller
@RequestMapping("/book")
public class BookController {
@Autowired
@Qualifier("BookServiceImpl")
private BookService bookService;
// 查詢全部書籍,並且返回到一個書籍展示頁面
@RequestMapping("/allBook")
public String list(Model model) {
List<Books> list = bookService.queryAllBook();
model.addAttribute("list", list);
return "allBook";
}
// 跳轉到新增書籍頁面
@RequestMapping("/toAddBook")
public String toAddPaper() {
return "addBook";
}
// 新增書籍的請求
@RequestMapping("/addBook")
public String addPaper(Books books) {
System.out.println(books);
bookService.addBook(books);
// 回到首頁
return "redirect:/book/allBook";
}
}
- 新增書籍頁面(addBook.jsp)
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>新增書籍</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- 引入 Bootstrap -->
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row clearfix">
<div class="col-md-12 column">
<div class="page-header">
<h1>
<small>新增書籍</small>
</h1>
</div>
</div>
</div>
<%--這裡將資訊傳送到addBook,識別後完成新增--%>
<%--required保證資訊填寫完整才能提交--%>
<form action="${pageContext.request.contextPath}/book/addBook" method="post">
書籍名稱:<input type="text" name="bookName" required><br><br><br>
書籍數量:<input type="text" name="bookCounts" required><br><br><br>
書籍詳情:<input type="text" name="detail" required><br><br><br>
<input type="submit" value="新增">
</form>
</div>
- BookController 類編寫 , 方法三:修改書籍
//跳轉到修改頁面
@RequestMapping("/toUpdateBook")
public String toUpdateBook(Model model, int id) {
Books books = bookService.queryBookById(id);
System.out.println(books);
model.addAttribute("book",books );
return "updateBook";
}
//修改書籍
@RequestMapping("/updateBook")
public String updateBook(Model model, Books book) {
System.out.println(book);
bookService.updateBook(book);
Books books = bookService.queryBookById(book.getBookID());
model.addAttribute("books", books);
return "redirect:/book/allBook";
}
- 修改書籍頁面(updateBook.jsp)
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>修改資訊</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>修改資訊</small>
</h1>
</div>
</div>
</div>
<form action="${pageContext.request.contextPath}/book/updateBook" method="post">
<input type="hidden" name="bookID" value="${book.getBookID()}"/>
書籍名稱:<input type="text" name="bookName" value="${book.getBookName()}"/>
書籍數量:<input type="text" name="bookCounts" value="${book.getBookCounts()}"/>
書籍詳情:<input type="text" name="detail" value="${book.getDetail() }"/>
<input type="submit" value="提交"/>
</form>
</div>
- BookController 類編寫 , 方法四:刪除書籍
@RequestMapping("/del/{bookId}")
public String deleteBook(@PathVariable("bookId") int id) {
bookService.deleteBookById(id);
return "redirect:/book/allBook";
}
- 新增日誌功能(在mybatis-config.xml新增)
<!--新增日誌功能-->
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>
- 查詢功能【待完善】
① 在allbook.jsp中新增
<div class="row">
<div class="col-md-4 column">
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增書籍</a>
<a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allbook">顯示全部</a>
</div>
<div class="col-md-4 column"></div>
<%--新增查詢功能--%>
<div class="col-md-4 column">
<form class="from-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right">
<span style="color: red; font-weight: bold">${error}</span>
<input type="text" name="queruBookName" class="form-inline" placeholder="請輸入要查詢的書籍名稱">
<input type="submit" value="查詢" class="btn btn-primary">
</form>
</div>
</div>
② 在BookController中新增
/*查詢功能*/
/*queruBookName是前端的,這裡是allbook.jsp中*/
@RequestMapping("/queryBook")
public String queryBook(String queruBookName,Model model){
}
③ 在Dao的BookMapper介面中新增查詢功能
Books queruBookByName(@Param("bookName") String bookName);
④ 在BookMapper.xml中新增查詢的SQL語句
<!--查詢語句,id與介面中的一致。parameterType是String型別,基本型別可不寫-->
<select id="queruBookByName" resultType="Books">
select * from ssmbuild.books where bookName = #{bookName}
</select>
為安全起見,可以在BookMapper中加上
Books queruBookByName(@Param("bookName") String bookName);
至此,Dao層編寫完畢,接下來是service層
⑥ 在service中的BookService介面中新增
Books queruBookByName(String bookName);
⑦ 在BookService介面的實現類中重寫方法(BookServiceImpl)
@Override
public Books queruBookByName(String bookName) {
return bookMapper.queruBookByName(bookName);
}
底層到這裡就結束了
⑧ controller中的BookController進行呼叫
/*查詢功能*/
/*queruBookName是前端的,這裡是allbook.jsp中*/
@RequestMapping("/queryBook")
public String queryBook(String queruBookName,Model model){
Books books = bookService.queruBookByName(queruBookName);
System.err.println(books);
/*查詢後只顯示需要的資料*/
List<Books> list = new ArrayList<Books>();
list.add(books);
if (books == null){
list = bookService.queryAllBook();
model.addAttribute("error","未查到");
}
model.addAttribute("list", list);
return "allbook";
}