SpringMVC总结
Posted 可峰科技
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MVC
M->Model:指代处理与记录数据的模型。
V->View：用于显示Model数据的界面。
C->Controller：是对Severlet的继续封装，可以使用注解来简化编程。
一般的流程是
第1步: 浏览器请求->Controller
第2步：Controller中接收请求的数据，进行处理（有可能和数据库打交道），然后把处理后的数据，存入Model中，返回给浏览器。
第3步：浏览器获取Model之后，对Model中的数据，在View中进行显示。
详细demo
1- 先在pojo中写一个Books类
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;
然后写dao层，这里是BookMapper
package com.kuang.dao;
import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface BookMapper
//add
int addBook(Books book);
//delete
int deleteBookById(@Param("bookId") int id);
//update
int updateBook(Books books);
//query
Books queryBookById(@Param("bookId") int id);
//query all book
List<Books> queryAllBook();
//
Books queryBookByName(@Param("bookName") String bookName);
BookMapper的实现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>
然后配置mybatis
-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>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>
<typeAliases>
<package name="com.kuang.pojo"/>
</typeAliases>
<mappers>
<mapper class="com.kuang.dao.BookMapper"></mapper>
</mappers>
</configuration>
接着配置数据库连接信息database.properties
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=UTF-8
name=root
password=123456
dao层写完了，就写service层
package com.kuang.service;
import com.kuang.pojo.Books;
import java.util.List;
public interface BookService
//add
int addBook(Books book);
//delete
int deleteBookById(int id);
//update
int updateBook(Books books);
//query
Books queryBookById(int id);
//query all book
List<Books> queryAllBook();
//
Books queryBookByName(String name);
然后实现该service层，写BookServiceImpl
package com.kuang.service;
import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;
import java.util.List;
public class BookServiceImpl implements BookService
//service调dao层：组合Dao
private BookMapper bookMapper;
public void setBookMapper(BookMapper bookMapper)
this.bookMapper = bookMapper;
@Override
public int addBook(Books book)
return bookMapper.addBook(book);
@Override
public int deleteBookById(int id)
return bookMapper.deleteBookById(id);
@Override
public int updateBook(Books books)
return bookMapper.updateBook(books);
@Override
public Books queryBookById(int id)
return bookMapper.queryBookById(id);
@Override
public List<Books> queryAllBook()
return bookMapper.queryAllBook();
@Override
public Books queryBookByName(String name)
return bookMapper.queryBookByName(name);
然后使用spring来托管dao层，编写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">
<!--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="$driver"/>
<property name="jdbcUrl" value="$url"/>
<property name="user" value="$name"/>
<property name="password" value="$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>
<!-- 3.sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!-- 配置dao接口扫描包，动态实现了dao接口可以注入到Spring容器中！-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 注入sqlSessionFactory-->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<property name="basePackage" value="com.kuang.dao"/>
</bean>
</beans>
然后spring托管service层，编写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:tx="http://www.springframework.org/schema/cache"
xmlns:aop="http://www.springframework.org/schema/aop"
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/cache
http://www.springframework.org/schema/cache/spring-cache.xsd
http://www.springframework.org/schema/aop
https://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
https://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 1.扫描service下的包-->
<context:component-scan base-package="com.kuang.service"/>
<!-- 2.将我们的所有业务类，注入到Spring，可以通过配置，或者注解实现-->
<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实现事务的植入-->
<!-- 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–>-->
<!-- <tx:attributes>-->
<!-- <tx:method name="*" propagetion="REQUIRED"></tx:method>-->
<!-- </tx:attributes>-->
<!-- </tx:advice>-->
<!-- -->
<!--<!– 配置事务的切入–>-->
<!-- <aop:config>-->
<!-- <aop:pointcut id="txPointCut" expression="* com.kuang.dao.*.*(..))"/>-->
<!-- <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"></aop:advisor>-->
<!-- </aop:config>-->
</beans>
最后spring配置Controller层，编写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">
<import resource="classpath:spring-dao.xml"/>
<import resource="classpath:spring-service.xml"/>
<!-- 1.注解驱动-->
<mvc:annotation-driven/>
<!-- 2.静态资源过滤-->
<mvc:default-servlet-handler/>
<!-- 3.扫描包：contoller-->
<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>
编写Controller层，编写BookController类
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.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.ArrayList;
import java.util.List;
@Controller
@RequestMapping("/book")
public class BookController
//controller 调 service层
@Autowired
@Qualifier("BookServiceImpl")
private BookService bookService;
//查询全部的书籍，并且返回到一个书籍展示页面
@RequestMapping("/allBook")
public String list(Model model)
List<Books> list = bookService.queryAllBook();
model.addAttribute("list",list);
return "allBook";
@RequestMapping("/toAddBook")
public String toAddPaper()
return "addBook";
@RequestMapping("addBook")
public String addBook(Books books)
bookService.addBook(books);
return "redirect:/book/allBook";
@RequestMapping("/toUpdate")
public String toUpdatePaper(int id, Model model)
System.out.println("id is " + id);
Books books = bookService.queryBookById(id);
model.addAttribute("QBook", books);
return "updateBook";
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