Spring是一个完整的J2EE框架和解决方案，完整并且模块化，你可以用的他的全部也可以只用他的一部分特性，Spring 包含 IoC, AOP, 事务处理，ORM, 也包括一个简单的MVC框架.
用Spring，自我感觉，可以使你的代码至少节约30%，它的很多template很不错的，比如简单封装后的jdbctemplate,jmstemplate等。
ioc用后就会爱不释手，它让你的代码风格完全改观。以前我要产生个对象，绝大多数时候只回想到new一个对象，而用spring的ioc，beanfactory，只需要配置一个xml文件即可。这种方式实现了松偶合，对单元测试非常有利。
还有它的aop，也是很不错的，
用spring的感觉,正如它的名字一样：如沐春风.
关于spring中的jms,最近一个项目用到,刚好研究了一下,在这里做一个整理备份.在此感谢同事Eric的帮助.
spring把jms进行了简单的封装,用它的JmsTemplate可以很方便的发送和接收消息,并且资源的管理都由template来管理了.
1:在web.xml文件中配置一个spring用的上下文:
< context-param >
< param-name > contextConfigLocation </ param-name >
< param-value >
/WEB-INF/jmsconfig.xml
</ param-value >
</ context-param >jmsconfig.xml用来装配jms,内容如下:
<? xml version="1.0" encoding="UTF-8" ?>
<! DOCTYPE beans PUBLIC "-//SPRING/DTD BEAN/EN" "http://www.springframework.org/dtd/spring-beans.dtd" >
< beans >
< bean id ="jmsConnectionFactory"
class ="org.springframework.jndi.JndiObjectFactoryBean" >
< property name ="jndiName" >
< value > jms/Ntelagent/RequestQCF </ value >
</ property >
</ bean >
< bean id ="destination"
class ="org.springframework.jndi.JndiObjectFactoryBean" >
< property name ="jndiName" >
< value > jms/Ntelagent/RequestQ </ value >
</ property >
</ bean >
< bean id ="jmsConnectionFactoryForReceive"
class ="org.springframework.jndi.JndiObjectFactoryBean" >
< property name ="jndiName" >
< value > jms/Ntelagent/ResponseQCF </ value >
</ property >
</ bean >
< bean id ="destinationForReceive"
class ="org.springframework.jndi.JndiObjectFactoryBean" >
< property name ="jndiName" >
< value > jms/Ntelagent/ResponseQ </ value >
</ property >
</ bean >
< bean id ="jmsTemplate" class ="org.springframework.jms.core.JmsTemplate102" >
< property name ="connectionFactory" >
< ref bean ="jmsConnectionFactory" />
</ property >
< property name ="defaultDestination" >
< ref bean ="destination" />
</ property >
< property name ="messageConverter" >
< ref bean ="jmsTrxConverter" />
</ property >
< property name ="receiveTimeout" >
< value > 1 </ value >
</ property >
</ bean >
< bean id ="jmsTemplateForReceive" class ="org.springframework.jms.core.JmsTemplate102" >
< property name ="connectionFactory" >
< ref bean ="jmsConnectionFactoryForReceive" />
</ property >
< property name ="defaultDestination" >
< ref bean ="destinationForReceive" />
</ property >
< property name ="messageConverter" >
< ref bean ="jmsTrxConverter" />
</ property >
< property name ="receiveTimeout" >
< value > 1 </ value >
</ property >
</ bean >
< bean id ="jmsTrxConverter" class ="co.transport.jms.JmsTransactionConverter" >
< property name ="rspQueue" >
< ref bean ="destinationForReceive" />
</ property >
</ bean >
< bean id ="jmsRequestTransport" class ="co.transport.jms.JmsRequestTransport" >
< property name ="jmsTemplate" >
< ref bean ="jmsTemplate" />
</ property >
< property name ="jmsTemplateForReceive" >
< ref bean ="jmsTemplateForReceive" />
</ property >
</ bean >
</ beans >
其中:
jmsConnectionFactory为jms连接工厂,属性jndiName的value为server服务配置的jndi名称.
destination为消息队列,属性jndiName为消息队列的jndi名称.
jmsTemplate为配置spring消息模版:采用JmsTemplate102(如果你的JMS实现符合JMS规范1.1版，则应该使用JmsTemplate)，其中的messageConverter属性配置了一个消息转换器，因为通常消息在发送前和接收后都需要进行一个前置和后置处理，转换器便进行这个工作。
由于我的sendQueue很receiveRueue是不同的queue，所以我配置了两个jmsTemplate：
jmsTemplateForReceive负责接收消息,jmsTemplate负责发发送消息.
发送消息的代码很简单:
jmsTemplate.convertAndSend(request);
接收消息也很简单:
Object obj = jmsTemplate.receiveAndConvert();
如果需要用一个过滤器接收特定的消息,则:
Object obj = this.jmsTemplateForReceive.receiveSelectedAndConvert(this.messageSelector);
发送和接收消息的class如下:
public class JmsRequestTransport implements RequestTransport {
private JmsTemplate jmsTemplate;
private JmsTemplate jmsTemplateForReceive;
private String messageSelector;
private String destinationName;
public void setJmsTemplate(JmsTemplate template){
this.jmsTemplate = template;
}
public void request(Object request) {
jmsTemplate.convertAndSend(request);
}
public Object receive() {
System.out.println("in JmsRequestTransport: destinationName = " + this.jmsTemplateForReceive.getDefaultDestinationName());
System.out.println("in JmsRequestTransport: messageSelector = " + messageSelector);
Object obj = this.jmsTemplateForReceive.receiveSelectedAndConvert(this.messageSelector);
return obj;
}
public String getMessageSelector() {
return messageSelector;
}
public void setMessageSelector(String string) {
messageSelector = string;
}
public String getDestinationName() {
return destinationName;
}
public void setDestinationName(String string) {
destinationName = string;
}
public JmsTemplate getJmsTemplateForReceive() {
return jmsTemplateForReceive;
}
public void setJmsTemplateForReceive(JmsTemplate template) {
jmsTemplateForReceive = template;
}
}
要实现一个消息转换器,只需要实现MessageConverter接口,MessageConverter很简单,它只有两个方法需要实现:
public Object fromMessage(Message msg){}
public Message toMessage(Object obj, Session session) throws JMSException{}
fromMessage为接收消息后,对消息进行的转换(通常是把一个message转化为一个Object对象)
toMessage为发送消息前需要的转化(通常为把一个Object转化为一个message对象)
我的JmsTransactionConverter转换器如下:
public class JmsTransactionConverter implements MessageConverter {
private Queue rspQueue;
public JmsTransactionConverter(){}
public Object fromMessage(Message msg){
MessageBean msgBean = new MessageBean();
TextMessage massage = (TextMessage)msg;
try {
String str = massage.getText();
msgBean.setHead("HeadTest");
msgBean.setOutput(str);
msgBean.setStatus("success");
} catch (JMSException e) {
// TODO Auto-generated catch block
msgBean = null;
e.printStackTrace();
}
finally {
return msgBean;
}
}
public Message toMessage(Object obj, Session session) throws JMSException{
String s = (String)obj;
TextMessage message = session.createTextMessage(s);
message.setStringProperty("mytype","java");
return message;
}
public Queue getRspQueue() {
return rspQueue;
}
public void setRspQueue(Queue queue) {
rspQueue = queue;
}
}其中:MessageBean是一个简单javabean:
public class MessageBean {
private String head;
private String output;
private String status;
public String getHead() {
return head;
}
public String getOutput() {
return output;
}
public String getStatus() {
return status;
}
public void setHead(String string) {
head = string;
}
public void setOutput(String string) {
output = string;
}
public void setStatus(String string) {
status = string;
}
}然后就可以用两个servlet来测试发送和接收消息:
发送消息:
public class JMSTestServlet extends HttpServlet {
/**
* @see javax.servlet.http.HttpServlet#void (javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
doGet(req, resp);
}
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
ServletOutputStream out = resp.getOutputStream();
try {
ServletContext servletContext = this.getServletContext();
WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
JmsRequestTransport transport = (JmsRequestTransport)wac.getBean("jmsRequestTransport");
System.out.println("in JMSTestServlet.doGet:begin send message");
String messageToSend = req.getParameter("message");
if(messageToSend == null)
{
messageToSend = "Default Message";
}
transport.request(messageToSend);
String s = "in JMSTestServlet.doGet:after send message and message is: " + messageToSend;
out.println("<HTML><BODY>");
out.println(s);
out.println("<br><input type=button name=back value=back οnclick=history.back()>");
out.println("<br><a href=receiveServlet>receive</a>");
out.println("</HTML></BODY>");
} catch(Exception e) {
out.println("<HTML><BODY>");
out.println(e.toString());
out.println("</HTML></BODY>");
}
}接收消息:
public class receiveServlet extends HttpServlet {
/**
* @see javax.servlet.http.HttpServlet#void (javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
doGet(req, resp);
}
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
ServletOutputStream out = resp.getOutputStream();
String selector = req.getParameter("selector");
String distination = req.getParameter("distination");
try {
String s = "nothing";
ServletContext servletContext = this.getServletContext();
WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
JmsRequestTransport transport = (JmsRequestTransport)wac.getBean("jmsRequestTransport");
System.out.println("selector = " + selector);
System.out.println("distination = " + distination);
transport.setDestinationName(distination);
transport.setMessageSelector(selector);
Object obj = transport.receive();
if(obj != null) {
MessageBean msgBean = (MessageBean)obj;
//System.out.println("in receiveServlet:");
s = "receive the message is: " + msgBean.getHead() + "," +
msgBean.getOutput() + ", " +
msgBean.getStatus();
} else {
s = "there is no message where " + selector;
}
out.println("<HTML><BODY>");
out.println(s);
out.println("<br>selector is :" + selector);
out.println("<br>distination is :" + distination);
out.println("<br><a href=jsp/sendMessage.jsp>sendMessage</a>");
out.println("</HTML></BODY>");
} catch(Exception e) {
out.println("<HTML><BODY>");
out.println("<br>selector is :" + selector);
out.println("<br>distination is :" + distination);
out.println("<br>" + e.toString());
out.println("</HTML></BODY>");
}
}
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