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介绍spring3的注解方式和基本配置

2012-12-09 20:03 375 查看

spring3增加的注解方式

@Service用于标注业务层组件

@Repository用于标注数据访问组件，即DAO组件

@Controller用于标注控制层组件，如Struts中的Action

@Component泛指组件，当组件不要好归类时，可以使用这个注解进行标注

注意点如下：

1、可以使用诸如@Service("personDao")修改bean名称，而它默认的是将首字母小写的类名作为<bean>名称

2、若要更改<bean>作用域的话，可以使用@Scope("prototype")注解来修改<bean>作用域

一般使用@Resource注解，而不要使用@Autowired注解

因为@Autowired注解是Spring提供的，而@Resource注解是J2EE提供的

在JDK6中就已经包含@Resource注解了，所以它没有跟Spring紧密耦合

一个配置spring+struts+jdbc的实现实例

spring.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-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/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx

http://www.springframework.org/schema/tx/spring-tx-3.0.xsd ">



<context:annotation-config />



<context:component-scan base-package="com.at" />



<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

<property name="location">

<value>classpath:jdbc.properties</value>

</property>

<property name="fileEncoding">

<value>UTF-8</value>

</property>

</bean>



<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">

<property name="driverClassName" value="${jdbc.driverClass}" />

<property name="Url" value="${jdbc.jdbcUrl}" />

<property name="username" value="${jdbc.user}" />

<property name="password" value="${jdbc.password}" />

</bean>

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">

<property name="dataSource" ref="dataSource"></property>

</bean>



<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

<property name="dataSource" ref="dataSource"/>

</bean>





</beans>

dao类

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.List;

import javax.annotation.Resource;

import org.apache.commons.lang.StringUtils;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.jdbc.core.RowMapper;

import org.springframework.stereotype.Repository;

import com.at.fee.model.FeeInfo;

@Repository

public class FeeInfoDao {

@Resource

private JdbcTemplate jdbcTemplate;

public List<FeeInfo> retrieveFeeInfos(){

// List<FeeInfo> listFeeInfo=new ArrayList<FeeInfo>();

String sql ="select * from ts_fee_info t where 1=1 ";

List listFeeInfo= jdbcTemplate.query(sql, new FeeInfoMapper());

return listFeeInfo;

}

}

service类

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.at.fee.dao.FeeInfoDao;

import com.at.fee.model.FeeInfo;

@Service

public class FeeInfoService {

@Resource

private FeeInfoDao feeInfoDao;//=new FeeInfoDao()

public List<FeeInfo> searchFeeInfos(){

List<FeeInfo> listFeeInfo=feeInfoDao.retrieveFeeInfos();

return listFeeInfo;

}

}

action类

import java.io.IOException;

import java.util.List;

import javax.annotation.Resource;

import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

import org.apache.struts2.ServletActionContext;

import org.springframework.context.annotation.Scope;

import org.springframework.stereotype.Controller;

import com.at.fee.model.FeeInfo;

import com.at.fee.service.FeeInfoService;

import com.at.tsframe.base.BaseStruts2Action;

@Scope("prototype")

@Controller("feeInfoAction")

public class FeeInfoAction extends BaseStruts2Action {

private static final long serialVersionUID = -1793059480215383708L;

@Resource(name= "feeInfoService")

private FeeInfoService feeInfoService;

public String searchFeeInfo() throws IOException{

List<FeeInfo> listFeeInfo=feeInfoService.searchFeeInfos();

JSONObject result=new JSONObject();

JSONArray rows = JSONArray.fromObject(listFeeInfo);

result.put("rows", rows);

result.put("total", listFeeInfo.size());

String jsonResult = result.toString();

HttpServletResponse response = ServletActionContext.getResponse();

response.getWriter().write(jsonResult);

return null;

}

}

struts配置

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">

<struts>



<constant name="struts.devMode" value="false" />



<constant name="struts.enable.DynamicMethodInvocation" value="false" />

<constant name="struts.configuration.xml.reload" value="true"/>



<constant name="struts.enable.DynamicMethodInvocation" value="true"/>

<constant name="struts.objectFactory" value="spring" />

<constant name="struts.action.extension" value="do" />

<constant name="struts.i18n.encoding" value="utf-8"/>



<include file="struts_fee.xml"/>

<include file="struts_spec.xml"/>

</struts>

struts_fee.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">

<struts>

<package name="fee" extends="struts-default" namespace="/fee">

<action name="searchFeeInfo" class="feeInfoAction" method="searchFeeInfo">



</action>

</package>

</struts>

参考：/article/7079653.html

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