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SSM框架搭建，MyBatis Generator自动创建代码，及遇到问题

2018-01-25 16:47 871 查看

前言：

工作中的项目有基于ssm框架，工作之前没有接触过springmvc、mybatis等，开发时项目都是领导搭建好了我们开发部分功能，所以自己也想试着搭建一个项目来学习，通过网上查资料看博客等方式来学习搭建，先把功能实现了，做得多了一些不理解的东西自然就理解了，有些东西别人也无法解释为什么，但是用的多了自然就明白了，其中一些东西也是在网上找来学习的。下面将学习过程和遇到的问题记录下来，方便以后自己看也欢迎大家来一起学习，如果发现有问题和好的建议的地方请多指点；

正文：

环境：MyEclipse14，项目基于maven；

第一步新建maven项目：

file->new->other->Myeclipse->Maven4Myeclise->MavenProject；选择工作空间，选择项目方式：

填写域名、项目名：

创建后如果只有资源文件，可以properties->java build path

出现正确的目录结构如下：

项目创建完成，更改相应的配置，如编码、jstl等

至此项目创建完成。

第二步，引入相关jar包：

在pom.xml中填写相关jar版本后更新项目，我的pom.xml文件：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>com.china</groupId>
<artifactId>ssm</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>ssm Maven Webapp</name>
<url>http://maven.apache.org</url>

<properties>

<spring.version>4.0.2.RELEASE</spring.version>

<mybatis.version>3.2.6</mybatis.version>

<slf4j.version>1.7.7</slf4j.version>
<log4j.version>1.2.17</log4j.version>
</properties>

<build>
<finalName>ssm</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.0</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>

<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>


<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
<version>${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-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>

<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>

<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>

&l
4000
t;dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.30</version>
</dependency>

<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>

<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>


<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>



<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.41</version>
</dependency>


<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>


<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>

<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.9</version>
</dependency>


<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>0.2.23</version>
</dependency>


<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.41</version>
</dependency>
</dependencies>

</project>
更新项目：项目右键->properties->Maven4MyEclipse->Update Project；
此处如果出现：JAX-RS(REST Web Services) 2.0 requires Java 1.7 or newer.问题，是jdk版本不匹配造成，解决方法：

在pom.xml中加上：

<build>
<finalName>ssm</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.0</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>第三步，建立spring和mybatis的整合：
1，新建jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/springmvctest?useServerPrepStmts=false&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=root

initialSize=0
#定义最大连接数
maxActive=20
#定义最大空闲
maxIdle=20
#定义最小空闲
minIdle=1
#定义最长等待时间
maxWait=600002.新建日志文件，log4j.xml：

log4j.rootLogger=INFO,Console,File
#定义日志输出目的地为控制台
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
#可以灵活地指定日志输出格式，下面一行是指定具体的格式
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%c] - %m%n

#文件大小到达指定尺寸的时候产生一个新的文件
log4j.appender.File = org.apache.log4j.RollingFileAppender
#指定输出目录
log4j.appender.File.File = logs/ssm.log
#定义文件最大大小
log4j.appender.File.MaxFileSize = 10MB
# 输出所以日志，如果换成DEBUG表示输出DEBUG以上级别日志
log4j.appender.File.Threshold = ALL
log4j.appender.File.layout = org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n

3.MyBatisGenerator自动创建代码：
所需材料：

将图中jar包文件等放在同一文件夹如mybatisgenerator下，其中src为新建的空文件夹，jar可以在网上找到，其中mybatis-generator-core-1.3.3.jar下载地址：http://download.csdn.net/download/tydq8023/10222235；generatorConfig.xml为配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>

<classPathEntry location="mysql-connector-java-5.1.38-bin.jar"/>
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>

<property name="suppressAllComments" value="true"/>
</commentGenerator>

<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/springmvctest" userId="root" password="root">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>

<javaModelGenerator targetPackage="com.china.entity" targetProject="src">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>

<sqlMapGenerator targetPackage="com.china.mapping" targetProject="src">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>

<javaClientGenerator type="XMLMAPPER" targetPackage="com.china.dao" targetProject="src">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>

<table tableName="user_t" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
</context>
</generatorConfiguration> 其中数据库地址表名等对应项目数据库地址及表名，我的建表语句：
CREATE TABLE `user_t` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`user_name` varchar(40) NOT NULL,
`password` varchar(255) NOT NULL,
`age` int(4) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

材料准备好后，在该文件夹（mybatisgenerator）下，shift+右键->在此处打开命令窗口->将命令：java -jar mybatis-generator-core-1.3.3.jar-configfile generatorConfig.xml –overwrite粘贴执行即可；其中mybatis-generator-core-1.3.3.jar对应材料中的jar包版本，此时src下面就是自动生成的实体、dao、数据库映射文件等。将文件粘贴到项目中即可。其中dao的名称是UserMapper，我习惯改成UserDao，更改名称后实体映射文件中的名称也要相应更改：其中sqlmap-user.xml的命名空间更改为对应dao的包名+类名：

创建spring-mybatis.xml，主要是配置数据源，整合spring和mybatis，事务管理等：

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">

<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>


<property name="initialSize" value="10"/>
<property name="minIdle" value="10"/>
<property name="maxActive" value="50"/>


<property name="maxWait" value="60000"/>

<property name="timeBetweenEvictionRunsMillis" value="60000" />


<property name="minEvictableIdleTimeMillis" value="300000" />

<property name="validationQuery" value="SELECT 'x'" />
<property name="testWhileIdle" value="true" />
<property name="testOnBorrow" value="false" />
<property name="testOnReturn" value="false" />


<property name="poolPreparedStatements" value="false" />
<property name="maxPoolPreparedStatementPerConnectionSize" value="20" />


<property name="filters" value="wall,stat" />
</bean>


<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />

<property name="mapperLocations" value="classpath:mybatis/sqlmap-user.xml"></property>
</bean>


<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.china.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>



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




<tx:annotation-driven transaction-manager="transactionManager" />

</beans>创建applicationContext.xml,主要配置jdbc，扫描包等；
<?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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd ">

<bean id="propertyConfigurer" class="org
abe7
.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations" value="classpath:jdbc.properties"/>
</bean>


<context:component-scan base-package="com.china">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>

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

</beans>至此，spring和mybatis的整合完成了，测试一下：

只实现查询看一下效果；

测试类：package com.china.smtest;

import org.apache.log4j.Logger;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.alibaba.fastjson.JSON;
import com.china.entity.User;
import com.china.service.UserService;

@RunWith(SpringJUnit4ClassRunner.class) //表示继承了SpringJUnit4ClassRunner类
@ContextConfiguration({ "classpath:applicationContext.xml"})
public class SmTest {
private static Logger logger = Logger.getLogger(SmTest.class);

@Autowired
public UserService userService = null;

@Test
public void test1() {
User user = userService.getUserById(1);
logger.info(JSON.toJSONString(user));
}
}
打印出了：{"age":24,"id":1,"password":"sfasgfaf","userName":"测试"}，数据库中的数据则说明成功；
第四步，整合springmvc：

SpringMVC需要的依赖在pom.xml中已经加上了，现在需在Web项目中的web.xml中添加启动SpringMVC启动配置和Spring整合SpringMVC的配置了。

目录结构如下：

controller代码：

package com.china.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.china.entity.User;
import com.china.service.UserService;
@Controller
public class UserController {
@Autowired
private UserService userService;

@RequestMapping("/showUser")
public String toIndex(HttpServletRequest request,Model model){
int userId = Integer.parseInt(request.getParameter("id"));
User user = this.userService.getUserById(userId);
if(user!=null){
request.setAttribute("name",user.getUserName());
return "showUser";
}
request.setAttribute("error", "没有找到该用户！");
return "error";

}
}
spring-mvc.xml：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
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-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">


<context:component-scan base-package="com.china.controller" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>

<mvc:annotation-driven />



<bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">

<property name="favorPathExtension" value="true"/>

<property name="favorParameter" value="true"/>
<property name="parameterName" value="format"/>

<property name="ignoreAcceptHeader" value="false"/>

<property name="mediaTypes"> 
<value>
json=application/json
xml=application/xml
html=text/html
</value>
</property>

<property name="defaultContentType" value="text/html"/>
</bean>


<mvc:default-servlet-handler />

<mvc:resources mapping="/static/**" location="/WEB-INF/static/"/>


<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/jsp/" p:suffix=".jsp"/>

</beans>web.xml

<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
<display-name>Archetype Created Web Application</display-name>
<!-- 读取spring配置文件 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>

<!-- 设计路径变量值
<context-param>
<param-name>webAppRootKey</param-name>
<param-value>springmvc.root</param-value>
</context-param>
-->

<!-- Spring字符集过滤器 -->
<filter>
<filter-name>SpringEncodingFilter</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>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>SpringEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 防止Spring内存溢出监听器 -->
<listener>
<listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
</listener>
<!-- Spring监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<!-- springMVC核心配置 -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<!--spingMVC的配置路径 -->
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 拦截设置 -->
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

jsp代码：<body>

${name } <br>

</body>
下面进行测试，部署到tomcat下，页面访问：http://localhost:8081/ssm/showUser?id=1

如果出现用户名称则说明成功，如果controller传到jsp的数据无法显示：<%@ page isELIgnored="false" %>

整合完成，可以在此基础上实现其他功能了。

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标签： ssm框架搭建与遇到问题 MyBatis Generator自动创建代码基于mysql的ssm框架

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