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▪类似微信的聊天界面ListView 微信中的ListView有一个特点就是存在许多不同的Item，即并不是平常的ListView，所有的Item布局都是一样的。针对这种情况，Google的Adapter提供了两个方法getItemViewType和getViewTypeCount。通过覆盖这两.........
▪ActiveMQ与spring集成实例之使用消息转换器 <?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.sprin.........
▪两表通过中间表多对多关联用HQL查询（重写） 如有user表，role表，userrole表，3者之间的关系是，user表和role表通过userrole表多对多关联。
user类：public class user implements java.io.Serializable { private Integer userId; private String userName; private Set userrole.........
[1]类似微信的聊天界面ListView
微信中的ListView有一个特点就是存在许多不同的Item，即并不是平常的ListView，所有的Item布局都是一样的。针对这种情况，Google的Adapter提供了两个方法getItemViewType和getViewTypeCount。通过覆盖这两个方法就可以实现一个ListView中存在多种不同的Layout。实现了更加个性化的ListView效果。我归纳了下微信中的Item可以分为7中。针对这7种Item我对应地写了7中listItem。在getView的时候判断下当前数据对象中需要通过哪种布局来展现，来实时获取布局。
下面看代码：
Message.java
public class Message {
private int type;//指定是哪种类型
private String value;//值
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
MainActivity.java:
public class MainActivity extends Activity {
private ListView lvData;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lvData = (ListView)findViewById(R.id.lv_data);
lvData.setAdapter(getAdapter());
}
private BaseAdapter getAdapter(){
return new MyAdapter(this, getMyData());
}
private List<Message> getMyData(){
List<Message> msgList = new ArrayList<Message>();
Message msg;
msg = new Message();
msg.setType(MyAdapter.VALUE_LEFT_TEXT);
msg.setValue("食堂真难吃啊");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_TIME_TIP);
msg.setValue("2012-12-23 下午2:23");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_RIGHT_TEXT);
msg.setValue("我就说食堂的饭难吃吧，你不相信！");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_LEFT_TEXT);
msg.setValue("好吧，这次听你的了。");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_TIME_TIP);
msg.setValue("2012-12-23 下午2:25");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_RIGHT_TEXT);
msg.setValue("就要圣诞了，有什么安排没有？");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_LEFT_TEXT);
msg.setValue("没有啊，你呢？");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_TIME_TIP);
msg.setValue("2012-12-23 下午3:25");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_LEFT_IMAGE);
msg.setValue("7min");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_RIGHT_TEXT);
msg.setValue("高帅富有三宝 木耳 跑车 和名表，" +
"黑木耳有三宝 美瞳 备胎 黑丝脚 ，穷矮挫有三宝 AV 手纸 射得早 ，女神有三宝 干嘛 呵呵 去洗澡 ，宅男有三宝 Dota 基友 破电脑 " +
"女屌丝有三宝 虎背 熊腰 眼睛小 ， 女屌丝还有三宝 饼脸 花痴 卖萌照");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_LEFT_TEXT);
msg.setValue("碉堡了");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_LEFT_AUDIO);
msg.setValue("7min");
msgList.add(msg);
msg = new Message();
msg.setType(MyAdapter.VALUE_RIGHT_IMAGE);
msg.setValue("7min");
msgList.add(msg);
return msgList;
}
}
下面是最重要的地方：
MyAdapter.java:
public class MyAdapter extends BaseAdapter{
public static final String KEY = "key";
public static final String VALUE = "value";
public static final int VALUE_TIME_TIP = 0;//7种不同的布局
public static final int VALUE_LEFT_TEXT = 1;
public static final int VALUE_LEFT_IMAGE = 2;
public static final int VALUE_LEFT_AUDIO = 3;
public static final int VALUE_RIGHT_TEXT = 4;
public static final int VALUE_RIGHT_IMAGE = 5;
public static final int VALUE_RIGHT_AUDIO = 6;
private LayoutInflater mInflater;
private Context context;
private List<Message> myList;
public MyAdapter(Context context, List<Message> myList){
this.context = context;
this.myList = myList;
for(Message msg:myList){
Log.d("myList:", msg.getType()+"");
}
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public void addItem(final Message item) {
myList.add(item);
notifyDataSetChanged();
}
@Override
public int getCount() {
return myList.size();
}
@Override
public Object getItem(int arg0) {
return myList.get(arg0);
}
@Override
public long getItemId(int arg0) {
return arg0;
}
@Override
public View getView(int position, View convertView, ViewGroup arg2) {
Message msg = myList.get(position);
int type = getItemViewType(position);
ViewHolder holder = null;
if(convertView == null){
holder = new ViewHolder();
switch (type) {
case VALUE_TIME_TIP:
convertView = mInflater.inflate(R.layout.list_item_time_tip, null);
holder.tvTimeTip = (TextView)convertView.findViewById(R.id.tv_time_tip);
holder.tvTimeTip.setText(msg.getValue());
break;
//左边
case VALUE_LEFT_TEXT:
convertView = mInflater.inflate(R.layout.list_item_left_text, null);
holder.ivLeftIcon = (ImageView)convertView.findViewById(R.id.iv_icon);
holder.btnLeftText = (Button)convertView.findViewById(R.id.btn_left_text);
holder.btnLeftText.setText(msg.getValue());
break;
case VALUE_LEFT_IMAGE:
convertView = mInflater.inflate(R.layout.list_item_left_iamge, null);
holder.ivLeftIcon = (ImageView)convertView.findViewById(R.id.iv_icon);
holder.ivLeftImage = (ImageView)convertView.findViewById(R.id.iv_left_image);
holder.ivLeftImage.setImageResource(R.drawable.test);
break;
case VALUE_LEFT_AUDIO:
convertView = mInflater.inflate(R.layout.list_item_left_audio, null);
holder.ivLeftIcon = (ImageView)convertView.findViewById(R.id.iv_icon);
holder.btnLeftAudio = (Button)convertView.findViewById(R.id.btn_left_audio);
holder.tvLeftAudioTime = (TextView)convertView.findViewById(R.id.tv_left_audio_time);
holder.tvLeftAudioTime.setText(msg.getValue());
break;
//右边
case VALUE_RIGHT_TEXT:
convertView = mInflater.inflate(R.layout.list_item_right_text, null);
holder.ivRightIcon = (ImageView)convertView.findViewById(R.id.iv_icon);
holder.btnRightText = (Button)convertView.findViewById(R.id.btn_right_text);
holder.btnRightText.setText(msg.getValue());
break;
case VALUE_RIGHT_IMAGE:
convertView = mInflater.inflate(R.layout.list_item_right_iamge, null);
holder.ivRightIcon = (ImageView)convertView.findViewById(R.id.iv_icon);
holder.ivRightImage = (ImageView)convertView.findViewById(R.id.iv_right_image);
holder.ivRightImage.setImageResource(R.drawable.test);
break;
case VALUE_RIGHT_AUDIO:
convertView = mInflater.inflate(R.layout.list_item_right_audio, null);
holder.ivRightIcon = (ImageView)convertView.findViewById(R.id.iv_icon);
holder.btnRightAudio = (Button)convertView.findViewById(R.id.btn_right_audio);
holder.tvRightAudioTime = (TextView)convertView.findViewById(R.id.tv_right_audio_time);
holder.tvRightAudioTime.setText(msg.getValue());
break;
default:
break;
}
convertView.setTag(holder);
}else{
holder = (ViewHolder)convertView.getTag();
}
return convertView;
}
/**
* 根据数据源的position返回需要显示的的layout的type
*
* */
@Override
public int getItemViewType(int position) {
Message msg = myList.get(position);
int type = msg.getType();
Log.e("TYPE:", ""+type);
return type;
}
/**
* 返回所有的layout的数量
*
* */
@Override
public int getViewTypeCount() {
return 7;
}
class ViewHolder{
private TextView tvTimeTip;//时间
private ImageView ivLeftIcon;//左边的头像
private Button btnLeftText;//左边的文本
private ImageView ivLeftImage;//左边的图像
private Button btnLeftAudio;//左边的声音
private TextView tvLeftAudioTime;//左边的声音时间
private ImageView ivRightIcon;//右边的头像
private Button btnRightText;//右边的文本
private ImageView ivRightImage;//右边的图像
private Button btnRightAudio;//右边的声音
private TextView tvRightAudioTime;//右边的声音时间
}
}
在getView()的时候通过switch判断当前一条数据需要使用的是哪种布局，实时进行加载。
getItemViewType() 和getViewTypeCount() 这两个方法起到的作用是循环回收利用不同的布局，起到了优化的作用！这是不同于平时使用Adapter的地方。
效果如下：
项目地址：
https://github.com/michaelye/WeiXinListView
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[2]ActiveMQ与spring集成实例之使用消息转换器
<?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-2.0.xsd">
<!--创建连接工厂 -->
<bean id="connectionFactory" >
<property name="brokerURL" value="tcp://localhost:61616"></property>
</bean>
<!-- 声明ActiveMQ消息目标,目标可以是一个队列，也可以是一个主题ActiveMQTopic -->
<bean id="destination" >
<constructor-arg index="0"
value="com.acca.activemq"></constructor-arg>
</bean>
<!---->
<bean id="jmsTemplate" >
<property name="connectionFactory" ref="connectionFactory"></property>
<property name="defaultDestination" ref="destination"></property>
<property name="receiveTimeout" value="600"></property>
<property name="messageConverter" ref="myConvert"></property>
</bean>
<bean id="sender" >
<property name="jmsTemplate" ref="jmsTemplate"></property>
</bean>
<bean id="receiver" >
<property name="jmsTemplate" ref="jmsTemplate"></property>
</bean>
<!-- 消息转换器 -->
<bean id="myConvert" >
</bean>
</beans>
/*
* Copyright (c) 2012-2032 Accounting Center of China Aviation(ACCA).
* All Rights Reserved.
*/
package com.acca.activemq.convert;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.ObjectMessage;
import javax.jms.Session;
import org.apache.activemq.command.ActiveMQObjectMessage;
import org.springframework.jms.support.converter.MessageConversionException;
import org.springframework.jms.support.converter.MessageConverter;
import com.acca.activemq.entity.User;
/**
*
* 消息转换器
*
* @author zhouhua, 2012-12-25
*/
public class MyConvert implements MessageConverter {
/**
* @param arg0
* @return
* @throws JMSException
* @throws MessageConversionException
* @see org.springframework.jms.support.converter.MessageConverter#fromMessage(javax.jms.Message)
*/
@Override
public Object fromMessage(Message message) throws JMSException, MessageConversionException {
User user=null;
if(message instanceof ActiveMQObjectMessage){
ActiveMQObjectMessage aMsg = (ActiveMQObjectMessage) message;
user=(User) aMsg.getObject();
}
return user;
}
/**
* @param arg0
* @param arg1
* @return
* @throws JMSException
* @throws MessageConversionException
* @see org.springframework.jms.support.converter.MessageConverter#toMessage(java.lang.Object, javax.jms.Session)
*/
@Override
public Message toMessage(Object object, Session session) throws JMSException,
MessageConversionException {
ActiveMQObjectMessage msg = (ActiveMQObjectMessage) session.createObjectMessage();
msg.setObject((User) object);
return msg;
}
}
/*
* Copyright (c) 2012-2032 Accounting Center of China Aviation(ACCA).
* All Rights Reserved.
*/
package com.acca.activemq;
import javax.jms.JMSException;
import javax.jms.MapMessage;
import org.springframework.jms.core.JmsTemplate;
import org.springframework.jms.support.JmsUtils;
import com.acca.activemq.entity.User;
/**
*
*
*
* @author zhouhua, 2012-12-25
*/
public class Receiver {
private JmsTemplate jmsTemplate;
// getter and setter
public JmsTemplate getJmsTemplate() {
return jmsTemplate;
}
public void setJmsTemplate(JmsTemplate jmsTemplate) {
this.jmsTemplate = jmsTemplate;
}
/**
* 构造函数
*/
public Receiver() {
}
public User receiveMessage() {
User user=null;
user=(User) jmsTemplate.receiveAndConvert();
return user;
}
}
/*
* Copyright (c) 2012-2032 Accounting Center of China Aviation(ACCA).
* All Rights Reserved.
*/
package com.acca.activemq;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.acca.activemq.entity.User;
/**
*
*
*
* @author zhouhua, 2012-12-25
*/
public class ReceiverTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Receiver receiver = (Receiver) context.getBean("receiver");
User user=receiver.receiveMessage();
System.out.print("地址："+user.getAddress()+"姓名:"+user.getUserName());
}
}
/*
/*
* Copyright (c) 2012-2032 Accounting Center of China Aviation(ACCA).
* All Rights Reserved.
*/
package com.acca.activemq;
import javax.jms.JMSException;
import javax.jms.MapMessage;
import javax.jms.Message;
import javax.jms.Session;
import org.springframework.jms.core.JmsTemplate;
import org.springframework.jms.core.MessageCreator;
import com.acca.activemq.entity.User;
/**
*
*
*
* @author zhouhua, 2012-12-25
*/
public class Sender {
private JmsTemplate jmsTemplate;
// getter and setter
public JmsTemplate getJmsTemplate() {
return jmsTemplate;
}
public void setJmsTemplate(JmsTemplate jmsTemplate) {
this.jmsTemplate = jmsTemplate;
}
public void sendInfo() {
User user=new User();
user.setAddress("北京市");
user.setUserName("张三");
jmsTemplate.convertAndSend(user);
}
}
/*
* Copyright (c) 2012-2032 Accounting Center of China Aviation(ACCA).
* All Rights Reserved.
*/
package com.acca.activemq;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
*
*
*
* @author zhouhua, 2012-12-25
*/
public class SenderTest {
/**
* @param args
*/
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Sender sender = (Sender) context.getBean("sender");
sender.sendInfo();
}
}
/*
* Copyright (c) 2012-2032 Accounting Center of China Aviation(ACCA).
* All Rights Reserved.
*/
package com.acca.activemq.entity;
import java.io.Serializable;
/**
*
*
*
* @author zhouhua, 2012-12-25
*/
public class User implements Serializable {
private String userName;
private String address;
/**
* @return the userName
*/
public String getUserName() {
return userName;
}
/**
* @param userName the userName to set
*/
public void setUserName(String userName) {
this.userName = userName;
}
/**
* @return the address
*/
public String getAddress() {
return address;
}
/**
* @param address the address to set
*/
public void setAddress(String address) {
this.address = address;
}
}
消息转换器主要目的将消息以pojo的形式传送，消息转换器在配置文件中配置好即可，JmsTemplete会自动根据类型转换
-
本文附件下载:
- jms6.zip (6.6 MB)
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[3]两表通过中间表多对多关联用HQL查询（重写）
如有user表，role表，userrole表，3者之间的关系是，user表和role表通过userrole表多对多关联。
user类：
public class user implements java.io.Serializable {
private Integer userId;
private String userName;
private Set userrole= new HashSet(0);
//get和set省略
}
role类：
public role implements java.io.Serializable {
private Integer roleId;
private String roleName;
private Set userrole= new HashSet(0);
//get和set省略
}
userrole类：
public userrole implements java.io.Serializable {
private Integer userroleID;
private role role;
private user user;
//get和set省略
}
对应的xml（只捡关联部分）：
user.hbm.xml：
<set name="userrole" inverse="true">
<key>
<column name="userId" not-null="true" />
</key>
<one-to-many />
</set>
role.hbm.xml：
<set name="userrole" inverse="true">
<key>
<column name="roleId" not-null="true" />
</key>
<one-to-many />
</set>
userrole.hbm.xml：
<many-to-one name="role" fetch="select">
<column name="roleId" not-null="true" />
</many-to-one>
<many-to-one name="user" fetch="select">
<column name="userId" not-null="true" />
</many-to-one>
问题是：如何用hql查找出角色为admin的用户的id和名字？
hql：select u.userId,u.userName from user u,userrole ur,role r where u.userID in(ur.user) and r.roleName='admin' and ur.userroleID in elements(r.userrole)
本例用到了in和in elements关键字，区别在于in elements用于set，in用于类对象。
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