SSM框架整合完整案例
阿新 • • 發佈：2018-12-11
這篇文章用SSM框架整合來完成一個全查商品表(items)，並將所有的商品資訊展示到頁面(showitems.jsp)中這樣的功能，讓大家快速熟練使用SSM框架。
一、整合思路
因為spring框架功能強大，涉及到整個web分層，所以這次的整合以spring框架為基礎，mybatis負責dao層，spring mvc 負責controller層
最終專案檔案結構如下圖:
二、案例實戰
1. 專案前期準備
新建web工程，匯入SSM框架專案需要的jar包。另外需要在資料庫(我這邊使用mysql資料庫)建立items表，新增資料，資料庫表如下圖：
2. 整合dao層
① mybatis全域性配置檔案(SqlConfig.xml)
<configuration> <settings> <setting name="logImpl" value="LOG4J"/> </settings> <typeAliases> <!-- 給vo包中的所有java bean起別名，別名就是類名 --> <package name="com.byzx.ssm.vo"/> </typeAliases> <!-- 資料來源的配置交給spring --> <!-- 關聯對映檔案交給sping的mapper掃描器 --> </configuration>
log4j.properties:
# Global logging configuration # developer-->DEBUG product-->INFO or ERROR log4j.rootLogger=DEBUG, stdout log4j.logger.org.mybatis.example.BlogMapper=TRACE # Console output... log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
② 配置spring.xml
<!-- 掃描service包，讓service的註解起作用 -->
<context:component-scan base-package="com.byzx.ssm.service"></context:component-scan>
<!-- 載入db.properties -->
<context:property-placeholder location="classpath:db.properties" />
<!-- 配置c3p0資料來源 -->
<bean id="c3p0ds" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}" ></property>
<property name="jdbcUrl" value="${jdbc.url}" ></property>
<property name= "user" value="${jdbc.username}" ></property>
<property name= "password" value="${jdbc.password}" ></property>
<property name="maxPoolSize" value="30"></property>
<property name="initialPoolSize" value="5"></property>
</bean>
<!-- 配置SqlSessionFactory -->
<bean id="ssf" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="c3p0ds"></property>
<property name="configLocation" value="classpath:SqlConfig.xml"></property>
</bean>
<!-- mapper掃描器 -->
<!-- 會自動生成一個標識為mapper介面型別首字母小寫的bean -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.byzx.ssm.dao"></property>
<property name="sqlSessionFactoryBeanName" value="ssf"></property>
</bean>
db.properties:
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis27?characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123456
③ 編寫POJO類(java bean)
public class Items {
private int id;
private String name;
private double price;
private String detail;
private Date createtime;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
public Date getCreatetime() {
return createtime;
}
public void setCreatetime(Date createtime) {
this.createtime = createtime;
}
@Override
public String toString() {
return "Items [id=" + id + ", name=" + name + ", price=" + price
+ ", detail=" + detail + ", createtime=" + createtime + "]";
}
}
④ 編寫ItemsMapper.xml
<mapper namespace="com.byzx.ssm.dao.ItemsMapper">
<!-- 全查商品表 items -->
<select id="findAllItem" resultType="Items">
select * from items
</select>
</mapper>
⑤ 編寫ItemsMapper.java介面
public interface ItemsMapper {
// 全查商品表
public List<Items> findAllItem();
}
⑥ 測試dao層
public static void main(String[] args) {
ApplicationContext ac = new ClassPathXmlApplicationContext("spring.xml");
ItemsMapper itemsMapper = (ItemsMapper)ac.getBean("itemsMapper");
List<Items> items = itemsMapper.findAllItem();
for(Items item: items){
System.out.println(item);
}
}
執行結果:
出現上述結果，說明整個dao層已經寫好，接下來到service層
3. 整合service層(使用註解)
ItemsService類:
@Service // 相當於配置了一個識別符號為ItemsService型別首字母小寫的bean
public class ItemsService {
// mapper掃描器會自動生成一個識別符號為itemsMapper的bean
// 註解@Autowired 可以將生成的bean賦值給全域性變數itemsMapper
@Autowired
private ItemsMapper itemsMapper;
// 全查items表
public List<Items> findAllItem(){
return itemsMapper.findAllItem();
}
}
4. 整合spring mvc
① 編寫Controller
@Controller
public class ItemsController{
@Autowired
private ItemsService itemsService;
@RequestMapping("/queryItems1.action")
public ModelAndView queryItems1(){ // 方法名可以任意
List<Items> items = itemsService.findAllItem();
ModelAndView mav = new ModelAndView();
// 新增資料
mav.addObject("ITEMS", items);
// 設定jsp頁面路徑
mav.setViewName("jsp/showitems.jsp");
return mav;
}
}
② 編寫springmvc.xml
<!-- 自動掃描bean -->
<context:component-scan base-package="com.byzx.ssm.controller"></context:component-scan>
<!-- 註解驅動 -->
<mvc:annotation-driven></mvc:annotation-driven>
<!-- 配置檢視解析器 ViewResolver -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>
③ 寫jsp頁面(jsp/showitems.jsp)
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<!DOCTYPE html >
<html>
<head>
<meta charset="UTF-8">
<title>查詢商品列表</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/queryItems1.action"
method="post">
查詢條件：
<table width="100%" border=1>
<tr>
<td><input type="submit" value="查詢" /></td>
</tr>
</table>
商品列表：
<table width="100%" border=1>
<tr>
<td>商品名稱</td>
<td>商品價格</td>
<td>生產日期</td>
<td>商品描述</td>
<td>操作</td>
</tr>
<c:forEach items="${ITEMS }" var="item">
<tr>
<td>${item.name }</td>
<td>${item.price }</td>
<td><fmt:formatDate value="${item.createtime}"
pattern="yyyy-MM-dd HH:mm:ss" /></td>
<td>${item.detail }</td>
<td><a
href="${pageContext.request.contextPath }/item/editItem.action?id=${item.id}">修改</a></td>
</tr>
</c:forEach>
</table>
</form>
</body>
</html>
④ 寫web.xml
<!-- 配置前端控制器 DispatcherServlet -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
<!-- 載入spring容器 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring.xml</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>