spring项目中target项目是什么‘’_手把手教你搭建一个SSM项目
SSM(Spring+SpringMVC+MyBatis)框架集由Spring、MyBatis两个开源框架整合而成(SpringMVC是Spring中的部分内容)。常作为数据源较简单的web项目的框架。
下面手把手教你使用IDEA搭建一个SSM项目：
新建project
File—》新建project，使用maven作为包管理工具，因为我这里使用了父项目，所以我是新建一个module，都一样的。
设置名称：
我们打开发现，项目没有java目录，没关系我们可以自己创建，打开文件结构(快捷键 Ctrl+Shift+Alt+S)
然后把这个java文件夹设置为source目录：
如果application.xml表头的xml报错，可以把链接复制过来：
该图片来源见水印
1 引入spring核心组件
修改pom.xml ， 注意标签
<properties>
<maven.compiler.source>1.8maven.compiler.source>
<maven.compiler.target>1.8maven.compiler.target>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<spring.version>4.3.5.RELEASEspring.version>
<mybatis.version>3.4.1mybatis.version>
properties>
<dependencies>
<dependency>
<groupId>javax.servletgroupId>
<artifactId>jstlartifactId>
<version>1.2version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatisartifactId>
<version>${mybatis.version}version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatis-springartifactId>
<version>1.3.3version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webmvcartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-coreartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-beansartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-contextartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-jdbcartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>log4jgroupId>
<artifactId>log4jartifactId>
<version>1.2.17version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>1.0.9version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.35version>
dependency>
dependencies>
<build>
<finalName>SSM_projectfinalName>
<plugins>
<plugin>
<groupId>org.apache.maven.pluginsgroupId>
<artifactId>maven-compiler-pluginartifactId>
<version>3.6.1version>
<configuration>
<source>${maven.compiler.source}source>
<target>${maven.compiler.target}target>
<encoding>UTF8encoding>
configuration>
plugin>
plugins>
build>
2 配置web.xml
这里引入了两个文件 applicationContext.xml 和 spring-mvc.xml
<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_3_1.xsd"version="3.1">
<display-name>mvcDemodisplay-name>
<welcome-file-list>
<welcome-file>index.jspwelcome-file>
welcome-file-list>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
listener>
<context-param>
<param-name>contextConfigLocationparam-name>
<param-value>classpath:applicationContext.xmlparam-value>
context-param>
<filter>
<filter-name>CharacterEncodingFilterfilter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
<init-param>
<param-name>encodingparam-name>
<param-value>utf-8param-value>
init-param>
<init-param>
<param-name>forceEncodingparam-name>
<param-value>trueparam-value>
init-param>
filter>
<filter-mapping>
<filter-name>CharacterEncodingFilterfilter-name>
<url-pattern>/*url-pattern>
filter-mapping>
<servlet>
<servlet-name>springmvcservlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
<init-param>
<param-name>contextConfigLocationparam-name>
<param-value>classpath:spring-mvc.xmlparam-value>
init-param>
<load-on-startup>1load-on-startup>
<async-supported>trueasync-supported>
servlet>
<servlet-mapping>
<servlet-name>springmvcservlet-name>
<url-pattern>/url-pattern>
servlet-mapping>
web-app>
注意：以下配置文件均在resources 目录下
3 新建`log4j.properties`
配置：
#日志输出级别
log4j.rootLogger=debug,stdout,D,E
#设置stdout的日志输出控制台
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
#输出日志到控制台的方式，默认为System.out
log4j.appender.stdout.Target = System.out
#设置使用灵活布局
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
#灵活定义输出格式
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} -[%p] method:[%c (%rms)] - %m%n
如果不需要日志管理，可以不配置，类似于log4j的日志管理工具还有logback,
logback可以参考：https://blog.csdn.net/yudianxiaoxiao/article/details/86664616
4 新建 `jdbc.properties`
本地数据库配置：
jdbc.driver=com.mysql.jdbc.Driver
#数据库地址
jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
#用户名
jdbc.username=root
#密码
jdbc.password=root
#最大连接数
c3p0.maxPoolSize=30
#最小连接数
c3p0.minPoolSize=10
#关闭连接后不自动commit
c3p0.autoCommitOnClose=false
#获取连接超时时间
c3p0.checkoutTimeout=10000
#当获取连接失败重试次数
c3p0.acquireRetryAttempts=2
初始化一个表：
DROP TABLE IF EXISTS t_user_hellocoder;
CREATE TABLE `t_user_hellocoder` (
`id` int(11) NOT NULL,
`name` VARCHAR(11) DEFAULT NULL,
`description` VARCHAR(100) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 ;
INSERT INTO `test`.`t_user_hellocoder`(`id`, `name`, `description`) VALUES (1, ''我是HaC'', ''一枚混迹于互联网的程序猿'');
5 配置 `applicati onContext.xml` 和 `spring-mvc.xml`
新建 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
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<context:component-scan base-package="com.ssm.hellocoder"/>
<mvc:annotation-driven/>
<mvc:default-servlet-handler/>
<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>
beans>
applicationContext.xml:
我新建的项目applicationContext.xml在WEB-INF目录下，需要把它移动到resources目录下，如果本来就在就不用管，没有就新建。
<?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: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-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties"/>
bean>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="typeAliasesPackage" value="com.ssm.hellocoder.entity"/>
<property name="mapperLocations" value="classpath:mapper/TUserHellocoderDao.xml"/>
bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<property name="basePackage" value="com.ssm.hellocoder.dao"/>
bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
bean>
beans>
6 新建controller、service、dao、entity、xml、jsp
先上目录结构，大家不懂的可以仿照一下：
TUserHellocoder.java
package com.ssm.hellocoder.entity;
import java.io.Serializable;
/**
* (TUserHellocoder)实体类
*
* @author HaC
* @since 2020-05-29 01:28:27
*/
public class TUserHellocoder implements Serializable {
private static final long serialVersionUID = 417502814533585676L;
private Integer id;
private String name;
private String description;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
TUserHellocoderController.java
package com.ssm.hellocoder.controller;
import com.ssm.hellocoder.service.TUserHellocoderService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import javax.annotation.Resource;
/**
* (TUserHellocoder)表控制层
*
* @author HaC
* @since 2020-05-29 00:47:08
*/
@Controller
@RequestMapping("/HelloCoder")
public class TUserHellocoderController {
/**
* 服务对象
*/
@Resource
private TUserHellocoderService tUserHellocoderService;
/**
* 通过主键查询单条数据
*
* @param id 主键
* @return 单条数据
*/
@GetMapping("/selectUser")
public ModelAndView selectOne(@RequestParam(value = "id") Integer id) {
ModelAndView md = new ModelAndView("index");
//把数据存到ModelAndView，给前端
md.addObject("user",this.tUserHellocoderService.queryById(id));
return md;
}
}
TUserHellocoderService.java
package com.ssm.hellocoder.service;
import com.ssm.hellocoder.entity.TUserHellocoder;
/**
* (TUserHellocoder)表服务接口
*
* @author HaC
* @since 2020-05-29 01:28:29
*/
public interface TUserHellocoderService {
/**
* 通过ID查询单条数据
*
* @param id 主键
* @return 实例对象
*/
TUserHellocoder queryById(Integer id);
}
TUserHellocoderServiceImpl.java
package com.ssm.hellocoder.service.impl;
import com.ssm.hellocoder.dao.TUserHellocoderDao;
import com.ssm.hellocoder.entity.TUserHellocoder;
import com.ssm.hellocoder.service.TUserHellocoderService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
/**
* (TUserHellocoder)表服务实现类
*
* @author HaC
* @since 2020-05-29 01:28:29
*/
@Service("tUserHellocoderService")
public class TUserHellocoderServiceImpl implements TUserHellocoderService {
@Resource
private TUserHellocoderDao tUserHellocoderDao;
/**
* 通过ID查询单条数据
*
* @param id 主键
* @return 实例对象
*/
@Override
public TUserHellocoder queryById(Integer id) {
return this.tUserHellocoderDao.queryById(id);
}
}
TUserHellocoderDao.java
package com.ssm.hellocoder.dao;
import com.ssm.hellocoder.entity.TUserHellocoder;
/**
* (TUserHellocoder)表数据库访问层
*
* @author HaC
* @since 2020-05-29 01:28:28
*/
public interface TUserHellocoderDao {
/**
* 通过ID查询单条数据
*
* @param id 主键
* @return 实例对象
*/
TUserHellocoder queryById(Integer id);
}
在resources目录下新建一个文件夹mapper，新建文件 TUserHellocoderDao.xml
<?xml version="1.0" encoding="UTF-8"?>
mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ssm.hellocoder.dao.TUserHellocoderDao">
<resultMap type="com.ssm.hellocoder.entity.TUserHellocoder" id="TUserHellocoderMap">
<result property="id" column="id" jdbcType="INTEGER"/>
<result property="name" column="name" jdbcType="VARCHAR"/>
<result property="description" column="description" jdbcType="VARCHAR"/>
resultMap>
<select id="queryById" resultMap="TUserHellocoderMap">
select
id, name, description
from test.t_user_hellocoder
where id = #{id}
select>
mapper>
在WEB-INF目录下新建一个文件夹jsp，新建文件 index.jsp
Hello World!
${user.name}
${user.description}
以上就是SSM项目的配置了。
7 运行
配置服务器运行：
加上 -Dfile.encoding=UTF-8 解决日志乱码
选择war包：
运行
浏览器输入 http://localhost:8081/HelloCoder/selectUser?id=1
大功告成！
源码在Github：https://github.com/DogerRain/DemoFamily
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