一. springmvc入门程序
1. 导包
2. 前端控制器
在web.xml中配置前端控制器
在jar包中找到DispatcherServlet, 复制全称
拦截规则为后缀action
上下文配置文件 classpath:springmvc.xml(暂时没有, 下一步编写)
<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
标签头
扫描@Controller @Service:base-package扫描基本包:Controler和Service的父包
本程序结构是这样的, 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层
@RequestMapping(value=”/one.action”): url, 访问路径–>项目名称/value的值
有两种写法, 1.视图名, 数据放置ModelAndView中, 返回ModelAndView对象
2. 将数据存数model中, 返回视图名
@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";
}
}优化 视图解释器
前缀 /WEB-INF/jsp/
后缀 .jsp
所以在spring.xml中配置视图解释器
视图解释器类的位置, 复制全称
<!-- 识图解释器 -->
<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代码可修改为
@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 简单写了个测试下
<body>
success!!
${value }
</body>运行下
一切正常!
配置三大组件
处理器映射器, 处理器适配器, 视图解释器(之前配置过了)
处理器映射器, 处理器适配器这两个可以由这一句话话搞定
加在 springmvc.xml 中
<mvc:annotation-driven/>二. 整合springmvc+mybatis
1. 导包
aop联盟包+aop织入包
mybatis包+mybatis依赖包
数据库驱动包
2. 配置文件
这是我的目录结构
db.properties: 数据库配置文件
我的数据库名是 test
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf-8
jdbc.username=root
jdbc.password=123456sqllMapConfig.xml: mybatis的配置文件
我的实体类是在springmvc.pojo下
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 设置别名 -->
<typeAliases>
<!-- 2. 指定扫描包，会把包内所有的类都设置别名，别名的名称就是类名，大小写不敏感 -->
<package name="springmvc.pojo" />
</typeAliases>
</configuration>log4j.properties: 日志配置文件
简单写的一个输出控制台的日志
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n在web.xml中配置spring监听器, 以及读取的配置文件applicationContext.xml
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!-- spirng监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>数据库有spring进行管理,在applicationContext.xml中加入
<context:property-placeholder location="classpath:db.properties"/>
<!-- 数据库连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${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的工厂 -->
<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动态代理开发 扫描 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 基本包 -->
<property name="basePackage" value="springmvc.dao"/>
</bean>
<!-- 注解事务 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 开启注解 -->
<tx:annotation-driven transaction-manager="transactionManager"/>3. pojo和dao层
数据库结构, 表名test, 一个自增主键, 一个text类型的值
CREATE TABLE `test` (
`id` int(11) NOT NULL auto_increment,
`ps` text,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8因此实体类为
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有两个方法
1. 根据id查询返回一个Demo
2. 保存Demo
public interface DemoMapper {
Demo findById(Integer id);
void saveDemo(Demo demo);
}DemoMapper.xml(放在同一目录下, 并且文件名相同) 编写sql语句, 语法就不一一介绍了,. 具体详见mybatis语法.
<?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层和Service层
Contriller层跟上面的入门程序大致类似, 是多了调用Service层的方法
查询id的时候写死的, 查询id = 1的值
保存也是, 由于id自增长所以不用管, 只给ps赋值了
@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层
接口
public interface DemoService {
public Demo findById(Integer id);
public void saveDemo(Demo demo);
}实现类, 单纯的调用Mapper方法, 并返回
@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);
}
}最后返回至 /WEB-INF/jsp/demo.jsp
一切正常, 数据库也有数据!
demo.jsp
<body>
success!!
${value }
"${demo.id }+
${demo.ps }""
</body>
</html>