spring4 -- web项目指引

这里采用的是eclipse创建的基础web项目，并在其基础上加入spring支持，并未采用官方的Maven和Gradle项目。

包结构：



其中mysql和c3p0是根据具体情况加的，其他基本是spring需要的基本包了。

要建立spring项目，首先需要在web.xml加入spring的配置：

<filter>
<filter-name>charsetFilter</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>
</filter>
<filter-mapping>
<filter-name>charsetFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

[/code]
这里设定了spring的主配置文件位于classpath的根目录，项目里与src同级。
spring-mvc.xml，这里主要是基于注解的配置，基于xml的配置不涉及:

<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
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/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"> 
<!-- 启用注解，该项可不要 -->
<context:annotation-config />
<!-- 扫描该包下的类注解 -->
<context:component-scan base-package="com.spring"/>
<!-- 属性文件读入 -->
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath*:jdbc.properties</value>
</list>
</property>
</bean>
<!-- jdbc数据源 -->
<!-- <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${c3p0.driverClass}" />
<property name="url" value="${c3p0.url}" />
<property name="username" value="root" />
<property name="password" value="db#123" />
</bean> -->

<!-- c3p0数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${c3p0.driverClass}"></property>
<property name="jdbcUrl" value="${c3p0.url}"></property>
<property name="user" value="${c3p0.user}"></property>
<property name="password" value="${c3p0.password}"></property>
<property name="acquireIncrement" value="${c3p0.acquireIncrement}"></property>
<property name="initialPoolSize" value="${c3p0.initialPoolSize}"></property>
<property name="maxIdleTime" value="${c3p0.maxIdleTime}"></property>
<property name="maxPoolSize" value="${c3p0.maxPoolSize}"></property>
<property name="minPoolSize" value="${c3p0.minPoolSize}"></property>

<property name="acquireRetryDelay" value="1000"></property>
<property name="acquireRetryAttempts" value="60"></property>
<property name="breakAfterAcquireFailure" value="false"></property>
</bean>

<!-- 事务配置 -->
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<tx:annotation-driven transaction-manager="txManager"/>
</beans>

这里使用的c3p0的数据源，也可采用其他数据源。

配置文件完成后就可以开始结构性代码的开发了，基于mvc的代码由3部分组成，分别是controller、service、dao，
Controller：

@Controller
public class SpringTestController {
@RequestMapping("/show")
public void showMsg(HttpServletResponse response){

mng.getUserInfo();
//dao.getUserInfo("100");

try {
response.getWriter().write("11111");
} catch (IOException e) {
e.printStackTrace();
}
}

@Autowired
private SpringTestService mng;

@Autowired
private SpringTestDao dao;
}

controller以@Controller注解标注，@RequestMapping定义了方法的url访问路径。HttpServletResponse response参数在需要用到response时传入，如果用不到的话不传。@autowired以依赖注入的方式标注了两个引用，service和dao。
Service：

@Service
public class SpringTestService {

public void getUserInfo(){
Map<String, Object> map = dao.getUserInfo("100");
}

@Autowired
private SpringTestDao dao;
}

Service以@Service注解标注
Dao：

@Repository
public class SpringTestDao {

private JdbcTemplate sjc;

@Autowired
public void setDataSource(DataSource dataSource) {
this.sjc = new JdbcTemplate(dataSource);
}

public Map<String, Object> getUserInfo(String userNo){
String sql = "select * from vyuan_user where userno = ?";
final Object[] params = new Object[] { userNo };
Map<String, Object> map = new HashMap<String, Object>();
map = sjc.queryForMap(sql, params);

/*sjc.query(sql, params, new RowCallbackHandler() {
@Override
public void processRow(ResultSet rs) throws SQLException {
//map.put("cno", rs.getInt("cno") + "");
map.put("cno", rs.getString("uname"));
// map.put("cno", rs.getDouble("score"));
}
});*/
System.out.println(map.get("uname"));
return map;
}
}

Dao需要以@Repository标注。
这是一个简单的项目指引，细节性的问题，后面慢慢梳理。
最后附上完整的项目代码：http://pan.baidu.com/s/1kTpBeib