Yesterday, the mybatis reverse engineering and paging applications in spring boot were sorted out. Today, the reverse engineering and paging applications in ssm project are sorted out.
Project running environment: eclipse+jdk1.8+maven+tomcat
Building ssm project
First, create a new maven project, project Archetype selection: maven-archetype-webapp, project completion, there will be generated index.jsp error.
Cause: The project does not rely on javax.servlet related class packages, which are in the tomcat class library
There are two solutions:
Method 1: Adding dependencies
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>Method 2: Depending on the tomcat class library, if eclipse already has a tomcat server
Right-click the project in turn - > build path - > configure build path - > Libraries - > Add Libraries - > Server Runtime - > select tomcat server lib - > OK
Dependencies are added successively when the project is completed. The code is as follows:
<properties>
<spring.version>4.3.7.RELEASE</spring.version>
</properties>
<dependencies>
<!-- unit testing -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- Solve new problems jsp Document error reporting -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<!-- spring package -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<!-- mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<!-- paging -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.1.2</version>
</dependency>
<!-- data base -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.37</version>
</dependency>
<!-- c3p0 Connection pool -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
</dependencies>maven install downloads dependency packages.
Add the file jdbc.properties under the src/main/resources folder, as follows:
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8 jdbc.username=root jdbc.password=123456
Add the file mybatis-config.xml under the src/main/resources folder, as follows:
<?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>
<!-- Configure global properties -->
<settings>
<!-- Use jdbc Of getGeneratedKeys Getting database self-increasing primary key values -->
<setting name="useGeneratedKeys" value="true" />
<!-- Replace column aliases by default with column labels:true -->
<setting name="useColumnLabel" value="true" />
<!-- Open Hump Naming Conversion:Table{create_time} -> Entity{createTime} -->
<setting name="mapUnderscoreToCamelCase" value="true" />
</settings>
</configuration>Add the folder spring under the src/main/resources folder and the file spring-dao.xml in spring, as follows:
<?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">
<!-- Configuration integration mybatis process -->
<!-- 1.Configure database related parameters properties Properties: ${url} -->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 2.Database connection pool -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!-- Configure connection pool properties -->
<property name="driverClass" value="${jdbc.driver}" />
<property name="jdbcUrl" value="${jdbc.url}" />
<property name="user" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<!-- c3p0 Private properties of connection pools -->
<property name="maxPoolSize" value="30" />
<property name="minPoolSize" value="10" />
<!-- Not automatically after closing the connection commit -->
<property name="autoCommitOnClose" value="false" />
<!-- Get connection timeout -->
<property name="checkoutTimeout" value="10000" />
<!-- Number of retries when connection acquisition fails -->
<property name="acquireRetryAttempts" value="2" />
</bean>
<!-- 3.To configure SqlSessionFactory object -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- Injecting database connection pool -->
<property name="dataSource" ref="dataSource" />
<!-- To configure MyBaties Global Profile:mybatis-config.xml -->
<property name="configLocation" value="classpath:mybatis-config.xml" />
<!-- scanning entity Packages use aliases -->
<property name="typeAliasesPackage" value="com.luis.entity" />
<!-- scanning sql configuration file:mapper Needed xml file -->
<property name="mapperLocations" value="classpath:mapper/*.xml" />
</bean>
<!-- 4.Configuration scan Dao Interface package, dynamic implementation Dao Interface, injected into spring Container -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- injection sqlSessionFactory -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
<!-- Give the need to scan Dao Interface package -->
<property name="basePackage" value="com.luis.mapper" />
</bean>
</beans>Add spring-service.xml to spring, the code is as follows:
<?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/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/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- scanning service All types of annotations used under the package -->
<context:component-scan base-package="com.luis.service" />
<!-- Configuring Transaction Manager -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- Injecting database connection pool -->
<property name="dataSource" ref="dataSource" />
</bean>
<!-- Configuring annotation-based declarative transactions -->
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>Add spring-web.xml to spring, the code is as follows:
<?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-3.2.xsd">
<!-- To configure SpringMVC -->
<!-- 1.open SpringMVC Annotation mode -->
<mvc:annotation-driven />
<!-- 2.Static resource default servlet To configure (1)Add processing of static resources: js,gif,png (2)Permitted use"/"Making global mapping -->
<mvc:resources mapping="/resources/**" location="/resources/" />
<mvc:default-servlet-handler />
<!-- 3.Define View Parser -->
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"></property>
<property name="suffix" value=".jsp"></property>
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
</bean>
<!-- 4.scanning web Dependent bean -->
<context:component-scan base-package="com.luis.web" />
</beans>Modify the web.xml file with the following code:
<web-app>
<servlet>
<servlet-name>spring-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/spring-*.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>spring-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
</web-app>So far, the ssm project has been completed!
Reverse Engineering and Paging Application
Firstly, the reverse engineering project is imported. See the specific use method for reference: My github
This paper still applies the database of the previous part. The table of the database is as follows:
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` bigint(20) NOT NULL,
`name` varchar(255) NOT NULL,
`age` int(4) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `user` VALUES ('1', 'wanger', '22');
INSERT INTO `user` VALUES ('2', 'zhangsan', '18');
INSERT INTO `user` VALUES ('3', 'lisi', '23');
INSERT INTO `user` VALUES ('4', 'wangwu', '21');Running file generates mapper interface, entity class and xml file.
Paging has added dependencies that can be applied directly.
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.1.2</version>
</dependency>Additionally, in the SqlSessionFactory bean of the SPRING-DAO.XML file, add:
<property name="plugins">
<array>
<bean class="com.github.pagehelper.PageInterceptor">
<property name="properties">
<value>
<!-- helperDialect: Different from 3.0+Version, now must be helperDialect，otherwise spring Error reporting when starting load -->
helperDialect=mysql
</value>
</property>
</bean>
</array>
</property>Write the service layer, UserService code as follows:
public interface UserService {
User selectByName(String name);
List<User> findAllUser(int pageNum, int pageSize);
}The UserService Impl code is as follows:
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
public User selectByName(String name) {
UserExample example = new UserExample();
Criteria criteria = example.createCriteria();
criteria.andNameEqualTo(name);
List<User> users = userMapper.selectByExample(example);
if (users != null && users.size() > 0) {
return users.get(0);
}
return null;
}
/**
* pageNum Start page number
* pageSize Number of data bars displayed per page
*/
public List<User> findAllUser(int pageNum, int pageSize) {
//Paging by passing parameters to the method
PageHelper.startPage(pageNum, pageSize);
UserExample example = new UserExample();
List<User> list = userMapper.selectByExample(example);
return list;
}
}Write the web layer, UserController code as follows:
@Controller
public class UserController {
@Autowired
private UserService userService;
@ResponseBody
@RequestMapping("/test")
public String querUserByName() {
User user = userService.selectByName("wanger");
System.out.println(user.toString());
return "index";
}
@RequestMapping("/list")
public String querUser() {
List<User> list = userService.findAllUser(1, 2);
//Getting Paging Information
PageInfo<User> pageInfo = new PageInfo<User>(list);
System.out.println(list.toString());
System.out.println("total:" + pageInfo.getTotal());
System.out.println("pages:" + pageInfo.getPages());
System.out.println("pageSize:" + pageInfo.getPageSize());
return "index";
}
}test
Deploy the project to tomcat, start, visit http://localhost:8080/ssm-demo/test, run the results:
User [id=1, name=wang1er, age=22]
Reverse Engineering and ssm Project Build Successfully!
Visit http://localhost:8080/ssm-demo/list and run the results:
Page{count=true, pageNum=1, pageSize=2, startRow=0, endRow=2, total=4, pages=2, reasonable=false, pageSizeZero=false}
total:4
pages:2
pageSize:2The pit encountered here: plugins are added to many examples on the Internet, and errors occur during paging:
warning: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in file [E:\code\eclipse-workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\ssm-demo\WEB-INF\classes\spring\spring-dao.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.Object[]' to required type 'org.apache.ibatis.plugin.Interceptor[]' for property 'plugins'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'com.github.pagehelper.PageHelper' to required type 'org.apache.ibatis.plugin.Interceptor' for property 'plugins[0]': no matching editors or conversion strategy found //September 06, 2018 10:51 p.m. org. spring framework. web. servlet. Dispatcher Servlet init Servlet Bean //Serious: Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in file [E:\code\eclipse-workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\ssm-demo\WEB-INF\classes\spring\spring-dao.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.Object[]' to required type 'org.apache.ibatis.plugin.Interceptor[]' for property 'plugins'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'com.github.pagehelper.PageHelper' to required type 'org.apache.ibatis.plugin.Interceptor' for property 'plugins[0]': no matching editors or conversion strategy found
It took a lot of time and ended up at https://blog.csdn.net/wangyuanjun008/article/details/79121459
A solution has been found. Change plugins to:
<property name="plugins">
<array>
<bean class="com.github.pagehelper.PageInterceptor">
<property name="properties">
<value>
<!-- helperDialect: Different from 3.0+Version, now must be helperDialect，otherwise spring Error reporting when starting load -->
helperDialect=mysql
</value>
</property>
</bean>
</array>
</property>The project test is finished!
Specific project code, see: github
This article refers to:
https://blog.csdn.net/wangyuanjun008/article/details/79121459