spring+servlet 简单演示

加载的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

  

文件结构图如下：

代码如下：

DemoDao.java

package org.baicai.spring.dao;


import java.util.List;


public interface DemoDao {
public List 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 query() throws Exception {
List list =new ArrayList();
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);
//由于servlet容器的生命周期不受spring管理，所以注入数据需要主动去spring容器内获取
   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

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">
      
   
   
    
   
   
     
     
     
     
    
   
   
       
    

sql.properties

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

web.xml

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">
 
 
    index.jsp
 
 
       配置spring监听器查找配置文件位置参数
       contextConfigLocation
       classpath:context.xml
 
  
 
       启动spring上下工厂的监听器
       
           org.springframework.web.context.ContextLoaderListener
       
 
  
 
        demo
        org.baicai.spring.servlet.DemoServlet
 
   
   
        demo
        /demo.do
   
  

index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>







   

         Spring+servlet
   

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" %>







   

       
         

            ${data[0]}-${data[1]}-${data[2]}
         

 
         
   

注：spring的演示都没有对编码进行设置

执行结果如下：