spring+servlet 簡單演示

加載的jar有：

log4j-1.2.16.jar

c3p0-0.9.1.2.jar

mysql-connector-java-5.1.14-bin.jar

org.springfaramework.asm-3.0.5.release.jar

org.springfaramework.beans-3.0.5.release.jar

org.springfaramework.context-3.0.5.release.jar

org.springfaramework.core-3.0.5.release.jar

org.springfaramework.expression-3.0.5.release.jar

org.springfaramework.web-3.0.5.release.jar

commons-logging-1.1.1.jar

文件結構圖如下：

代碼如下：

DemoDao.java

package org.baicai.spring.dao;

import java.util.List;

public interface DemoDao {
public List<Object[]> query() throws Exception;

}

DemoDaoImpl.java

package org.baicai.spring.dao.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

import javax.sql.DataSource;

import org.baicai.spring.dao.DemoDao;

public class DemoDaoImpl implements DemoDao {
private DataSource source;

public DataSource getSource()
{
return source;
}
public void setSource(DataSource source)
{
this.source=source;
}

@Override
public List<Object[]> query() throws Exception {
List<Object[]> list =new ArrayList<Object[]>();
Connection connection=source.getConnection();
PreparedStatement ps = connection.prepareStatement(" select * from User ");
ResultSet rs = ps.executeQuery();
while(rs.next())
{
Object[] datas = new Object[3];
for (int i = 0; i < datas.length; i++) {
datas[i]=rs.getObject(i+1);
}
list.add(datas);
}
connection.close();
return list;
}

}

DemoServlet.java

package org.baicai.spring.servlet;

import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.baicai.spring.dao.DemoDao;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

public class DemoServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
private ApplicationContext context;
private DemoDao dao;

@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
//由於servlet容器的生命週期不受spring管理，所以注入數據需要主動去spring容器內獲取
context = WebApplicationContextUtils.getRequiredWebApplicationContext(this.getServletContext());
dao=context.getBean("demoDao",DemoDao.class);
}

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
try {
req.setAttribute("list", dao.query());
req.getRequestDispatcher("/Demo/demo.jsp").forward(req, resp);
} catch (Exception e) {
throw new ServletException(e);
}

}

}

context.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<bean id="propertyPlaceholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:sql.properties"></property>
</bean>

<bean id="c3p0" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${driver}"></property>
<property name="jdbcUrl" value="${url}"></property>
<property name="user" value="${username}"></property>
<property name="password" value="${password}"></property>
</bean>

<bean id="demoDao" class="org.baicai.spring.dao.impl.DemoDaoImpl">
<property name="source" ref="c3p0"></property>
</bean>
</beans>

sql.properties

driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\://127.0.0.1\:3306/mysql?characterEncoding\=utf8
username=root
password=paul

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
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_3_0.xsd">
<display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<context-param>
<description>配置spring監聽器查找配置文件位置參數</description>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:context.xml</param-value>
</context-param>

<listener>
<description>啓動spring上下工廠的監聽器</description>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>

<servlet>
<servlet-name>demo</servlet-name>
<servlet-class>org.baicai.spring.servlet.DemoServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>demo</servlet-name>
<url-pattern>/demo.do</url-pattern>
</servlet-mapping>

</web-app>

index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Spring+servlet</title>
</head>
<body>
<center>
<a href="demo.do">Spring+servlet</a>
</center>
</body>
</html>

demo.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Spring+servlet</title>
</head>
<body>
<center>
<c:forEach items="${list}" var="data">
<h1>
${data[0]}-${data[1]}-${data[2]}
</h1>
</c:forEach>
</center>
</body>
</html>