一. springmvc入門程序
1. 導包
2. 前端控制器
在web.xml中配置前端控制器
在jar包中找到DispatcherServlet, 複製全稱
攔截規則爲後綴action
上下文配置文件 classpath:springmvc.xml(暫時沒有, 下一步編寫)
<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>3. springmvc.xml
標籤頭
掃描@Controller @Service:base-package掃描基本包:Controler和Service的父包
本程序結構是這樣的, 所以基本包就是 springmvc
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
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-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<context:component-scan base-package="springmvc"/>
</beans>4.Controller層
@RequestMapping(value=”/one.action”): url, 訪問路徑–>項目名稱/value的值
有兩種寫法, 1.視圖名, 數據放置ModelAndView中, 返回ModelAndView對象
2. 將數據存數model中, 返回視圖名
@Controller
public class DemoController {
@RequestMapping(value="/one.action")
public ModelAndView one(){
ModelAndView mav = new ModelAndView();
mav.setViewName("/WEB-INF/jsp/success.jsp");
mav.addObject("value", "one.action");
return mav;
}
@RequestMapping(value="/two.action")
public String two(Model model){
model.addAttribute("value", "two.action");
return "/WEB-INF/jsp/success.jsp";
}
}優化 視圖解釋器
前綴 /WEB-INF/jsp/
後綴 .jsp
所以在spring.xml中配置視圖解釋器
視圖解釋器類的位置, 複製全稱
<!-- 識圖解釋器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>所以上述Controller代碼可修改爲
@Controller
public class DemoController {
@RequestMapping(value="/one.action")
public ModelAndView one(){
ModelAndView mav = new ModelAndView();
mav.setViewName("success");
mav.addObject("value", "one.action");
return mav;
}
@RequestMapping(value="/two.action")
public String two(Model model){
model.addAttribute("value", "two.action");
return "success";
}
}success.jsp 簡單寫了個測試下
<body>
success!!
${value }
</body>運行下
一切正常!
配置三大組件
處理器映射器, 處理器適配器, 視圖解釋器(之前配置過了)
處理器映射器, 處理器適配器這兩個可以由這一句話話搞定
加在 springmvc.xml 中
<mvc:annotation-driven/>二. 整合springmvc+mybatis
1. 導包
aop聯盟包+aop織入包
mybatis包+mybatis依賴包
數據庫驅動包
2. 配置文件
這是我的目錄結構
db.properties: 數據庫配置文件
我的數據庫名是 test
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf-8
jdbc.username=root
jdbc.password=123456sqllMapConfig.xml: mybatis的配置文件
我的實體類是在springmvc.pojo下
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 設置別名 -->
<typeAliases>
<!-- 2. 指定掃描包，會把包內所有的類都設置別名，別名的名稱就是類名，大小寫不敏感 -->
<package name="springmvc.pojo" />
</typeAliases>
</configuration>log4j.properties: 日誌配置文件
簡單寫的一個輸出控制檯的日誌
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n在web.xml中配置spring監聽器, 以及讀取的配置文件applicationContext.xml
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!-- spirng監聽器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>數據庫有spring進行管理,在applicationContext.xml中加入
<context:property-placeholder location="classpath:db.properties"/>
<!-- 數據庫連接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="maxActive" value="10" />
<property name="maxIdle" value="5" />
</bean>
<!-- Mybatis的工廠 -->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!-- 核心配置文件的位置 -->
<property name="configLocation" value="classpath:sqlMapConfig.xml"/>
</bean>
<!-- Mapper動態代理開發 掃描 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 基本包 -->
<property name="basePackage" value="springmvc.dao"/>
</bean>
<!-- 註解事務 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 開啓註解 -->
<tx:annotation-driven transaction-manager="transactionManager"/>3. pojo和dao層
數據庫結構, 表名test, 一個自增主鍵, 一個text類型的值
CREATE TABLE `test` (
`id` int(11) NOT NULL auto_increment,
`ps` text,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8因此實體類爲
public class Demo {
private Integer id;
private String ps;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getPs() {
return ps;
}
public void setPs(String ps) {
this.ps = ps;
}
@Override
public String toString() {
return "Test [id=" + id + ", ps=" + ps + "]";
}
}DemoMapper有兩個方法
1. 根據id查詢返回一個Demo
2. 保存Demo
public interface DemoMapper {
Demo findById(Integer id);
void saveDemo(Demo demo);
}DemoMapper.xml(放在同一目錄下, 並且文件名相同) 編寫sql語句, 語法就不一一介紹了,. 具體詳見mybatis語法.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="springmvc.dao.DemoMapper">
<select id="findById" parameterType="Integer" resultType="springmvc.pojo.Demo">
select * from test where id = #{v}
</select>
<insert id="saveDemo" parameterType="springmvc.pojo.Demo">
insert into test (ps) values (#{ps})
</insert>
</mapper>4. Controller層和Service層
Contriller層跟上面的入門程序大致類似, 是多了調用Service層的方法
查詢id的時候寫死的, 查詢id = 1的值
保存也是, 由於id自增長所以不用管, 只給ps賦值了
@Controller
public class DemoController {
@Resource(name="demoService")
private DemoService demoService;
@RequestMapping(value="/findById.action")
public String findDemoById(Model model){
Demo demo = demoService.findById(1);
model.addAttribute("value", "findDemoById");
model.addAttribute("demo", demo);
return "demo";
}
@RequestMapping(value="/save.action")
public String save(Model model){
Demo demo = new Demo();
demo.setPs("22222");
demoService.saveDemo(demo);
model.addAttribute("value", "saveDemo");
model.addAttribute("demo", demo);
return "demo";
}
}Service層
接口
public interface DemoService {
public Demo findById(Integer id);
public void saveDemo(Demo demo);
}實現類, 單純的調用Mapper方法, 並返回
@Service("demoService")
public class DemoServiceImpl implements DemoService {
@Autowired
private DemoMapper demoMapper;
@Override
public Demo findById(Integer id) {
return demoMapper.findById(id);
}
@Override
public void saveDemo(Demo demo) {
demoMapper.saveDemo(demo);
}
}最後返回至 /WEB-INF/jsp/demo.jsp
一切正常, 數據庫也有數據!
demo.jsp
<body>
success!!
${value }
"${demo.id }+
${demo.ps }""
</body>
</html>