LoginController
@Controller
public class LoginController {
@RequestMapping("test")
public void login() {
LoginServiceImp loginService = new LoginServiceImp();
loginService.loadUserInfo();
}
}
LoginServiceImp
public class LoginServiceImp implements ILoginService {
LoginDaoImp loginDao = new LoginDaoImp();
/*
* (non-Javadoc)
*
* @see
* com.sani.service.ILoginService#loadUserInfo(com.sani.bean.UserInfoBean)
*/
public List loadUserInfo() {
return loginDao.loadUserInfo();
}
}
LoginDaoImp
public class LoginDaoImp extends BaseDao implements ILoginDao {
/*
* (non-Javadoc)
*
* @see com.sani.dao.ILoginDao#loadUserInfo()
*/
public List<UserInfoBean> loadUserInfo() {
String sql = "select NOW();";
List tmpList = this.getJdbcTemplate().queryForList(sql);
System.out.println(tmpList.size());
return tmpList;
}
}
BaseDao
public class BaseDao extends JdbcDaoSupport {
Logger log = Logger.getLogger(this.getClass().getName());
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<!-- 字符编码过滤器 -->
<filter>
<filter-name>encodingFilter</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>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log4j.properties</param-value>
</context-param>
<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>60000</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<!-- 应用上下文配置文件 -->
<!-- Spring 容器加载 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-db.xml</param-value>
</context-param>
<!-- 配置spring核心servlet -->
<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-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!--
url-pattern配置为/，不带文件后缀，会造成其它静态文件(js，css等)不能访问。如配为*.do，则不影响静态文件的访问
-->
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>30</session-timeout>
</session-config>
<!-- 欢迎页面 -->
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
spring-servlet.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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
<!-- 启动注解驱动的Spring MVC功能，注册请求url和注解POJO类方法的映射-->
<mvc:annotation-driven />
<!-- 允许对静态资源文件的访问 -->
<mvc:default-servlet-handler />
<!--
启动包扫描功能，以便注册带有@Controller、@Service、@repository、@Component等注解的类成为spring的bean
-->
<context:component-scan base-package="com.sani.controller" />
<context:component-scan base-package="com.sani.service" />
<context:component-scan base-package="com.sani.dao" />
<!-- 对模型视图名称的解析，在请求时模型视图名称添加前后缀 -->
<!-- jsp视图解析器 -->
<bean id="jspViewResolver"
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" />
<property name="order" value="1" />
</bean>
</beans>
spring-db.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:aop="http://www.springframework.org/schema/aop"
xmlns:jaxws="http://cxf.apache.org/jaxws" xmlns:task="http://www.springframework.org/schema/task"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://cxf.apache.org/jaxws
http://cxf.apache.org/schemas/jaxws.xsd"
default-autowire="byName">
<!--
<context:property-placeholder location="classpath:jdbc.properties" />
-->
<!-- 配置数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close" lazy-init="false">
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/wms" />
<property name="user" value="root" />
<property name="password" value="123" />
<!--连接池中保留的最小连接数。 -->
<property name="minPoolSize">
<value>5</value>
</property>
<!--连接池中保留的最大连接数。Default: 15 -->
<property name="maxPoolSize">
<value>30</value>
</property>
<!--初始化时获取的连接数，取值应在minPoolSize与maxPoolSize之间。Default: 3 -->
<property name="initialPoolSize">
<value>10</value>
</property>
<!--最大空闲时间,60秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 -->
<property name="maxIdleTime">
<value>60</value>
</property>
<!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3 -->
<property name="acquireIncrement">
<value>5</value>
</property>
<!--
JDBC的标准参数，用以控制数据源内加载的PreparedStatements数量。但由于预缓存的statements
属于单个connection而不是整个连接池。所以设置这个参数需要考虑到多方面的因素。
如果maxStatements与maxStatementsPerConnection均为0，则缓存被关闭。Default: 0
-->
<property name="maxStatements">
<value>0</value>
</property>
<!--每60秒检查所有连接池中的空闲连接。Default: 0 -->
<property name="idleConnectionTestPeriod">
<value>60</value>
</property>
<!--定义在从数据库获取新连接失败后重复尝试的次数。Default: 30 -->
<property name="acquireRetryAttempts">
<value>30</value>
</property>
<!--
获取连接失败将会引起所有等待连接池来获取连接的线程抛出异常。但是数据源仍有效
保留，并在下次调用getConnection()的时候继续尝试获取连接。如果设为true，那么在尝试
获取连接失败后该数据源将申明已断开并永久关闭。Default: false
-->
<property name="breakAfterAcquireFailure">
<value>true</value>
</property>
<!--
因性能消耗大请只在需要的时候使用它。如果设为true那么在每个connection提交的
时候都将校验其有效性。建议使用idleConnectionTestPeriod或automaticTestTable
等方法来提升连接测试的性能。Default: false
-->
<property name="testConnectionOnCheckout">
<value>false</value>
</property>
</bean>
<!-- 配置Jdbc模板 -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"
lazy-init="false">
<property name="dataSource" ref="dataSource" />
</bean>
<bean id="baseDAO" class="com.sani.dao.imp.BaseDao" lazy-init="false">
<property name="jdbcTemplate" ref="jdbcTemplate" />
</bean>
</beans>
现在只要调用action—test就会空指针 是什么原因？应该这么改？
关键在于你哪里报空指针，this.getJdbcTemplate()这个？还是哪个地方报空指针，看你spring配置是没有问题 的
感觉你的controller中好像都没有使用注解将service注入呢？