把list中根据相同属性（合为一个），计算不同属性转化为另外一个list
1.原list封装
package test;
import java.io.Serializable;
import java.util.Date;
/**
* Created by hongdi.ren.
*/
public class PrinterStatusLog implements Serializable{private int id;
private int shopId;
private int deviceNumber;
private int connectStatus;
private Date statusTime;
private Date addTime;
private Date updateTime;
public int getPaperStatus() {
return paperStatus;
} public void setPaperStatus(int paperStatus) {
this.paperStatus = paperStatus;
} private int paperStatus;
public int getId() {
return id;
}public void setId(int id) {
this.id = id;
}public int getShopId() {
return shopId;
}public void setShopId(int shopId) {
this.shopId = shopId;
}public int getDeviceNumber() {
return deviceNumber;
}public void setDeviceNumber(int deviceNumber) {
this.deviceNumber = deviceNumber;
}public int getConnectStatus() {
return connectStatus;
}public void setConnectStatus(int connectStatus) {
this.connectStatus = connectStatus;
}public Date getStatusTime() {
return statusTime;
}public void setStatusTime(Date statusTime) {
this.statusTime = statusTime;
}public Date getAddTime() {
return addTime;
}public void setAddTime(Date addTime) {
this.addTime = addTime;
}public Date getUpdateTime() {
return updateTime;
}public void setUpdateTime(Date updateTime) {
this.updateTime = updateTime;
}@Override
public String toString() {
final StringBuilder sb = new StringBuilder("PrinterStatusLog{");
sb.append("shopId=").append(shopId);
sb.append(", deviceNumber=").append(deviceNumber);
sb.append(", connectStatus=").append(connectStatus);
sb.append(", statusTime=").append(statusTime);
sb.append(", updateTime=").append(updateTime);
sb.append('}');
return sb.toString();
}
}2.转换后的list（根据shopId&&deviceNumber相同的元素，转化为另外一个list，并且计算出connectstatus中0和1的个数，放在第二个list的offlinderimes和onlinetimes中，并保留addtime,updatetime,statusTime最近的的时间）
package test;
import java.util.Date;
/**
* Created by Administrator on 2016/5/24.
*/
public class PrinterStatusVO {private int shopId;
private String shopName;
private String cityName;
private int deviceNumber;
private Date statusTime;
private Date firstTime;
private Date lastTime;
private int connectStatus;
/**
* 上线次数
*/private int onlineTimes;
/**
* 下线次数
*/
private int offlineTimes;
public int getShopId() {
return shopId;
}public void setShopId(int shopId) {
this.shopId = shopId;
}public String getShopName() {
return shopName;
}public void setShopName(String shopName) {
this.shopName = shopName;
}public int getDeviceNumber() {
return deviceNumber;
}public void setDeviceNumber(int deviceNumber) {
this.deviceNumber = deviceNumber;
}public Date getStatusTime() {
return statusTime;
}public void setStatusTime(Date statusTime) {
this.statusTime = statusTime;
}public Date getLastTime() {
return lastTime;
}public void setLastTime(Date lastTime) {
this.lastTime = lastTime;
}public Date getFirstTime() {
return firstTime;
}public void setFirstTime(Date firstTime) {
this.firstTime = firstTime;
}public int getOnlineTimes() {
return onlineTimes;
}public void setOnlineTimes(int onlineTimes) {
this.onlineTimes = onlineTimes;
}public int getOfflineTimes() {
return offlineTimes;
}public void setOfflineTimes(int offlineTimes) {
this.offlineTimes = offlineTimes;
}public String getCityName() {
return cityName;
}public void setCityName(String cityName) {
this.cityName = cityName;
}public int getConnectStatus() {
return connectStatus;
}public void setConnectStatus(int connectStatus) {
this.connectStatus = connectStatus;
}@Override
public String toString() {
final StringBuilder sb = new StringBuilder("PrinterStatusLogVO{");
sb.append("shopId=").append(shopId);
sb.append(", deviceNumber=").append(deviceNumber);
sb.append(", statusTime=").append(statusTime);
sb.append(", firstTime=").append(firstTime);
sb.append(", lastTime=").append(lastTime);
sb.append(", onlineTimes=").append(onlineTimes);
sb.append(", offlineTimes=").append(offlineTimes);
sb.append('}');
return sb.toString();
} }
3.测试：
package test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import net.sf.json.JSONArray;
public class ListToList {
public static final SimpleDateFormat FORMAT = new SimpleDateFormat("yyyy-MM-dd");
public static void main(String[] args) {
List list = new ArrayList();
PrinterStatusLog n5 = new PrinterStatusLog();
n5.setShopId(1);
n5.setDeviceNumber(2);
n5.setConnectStatus(0);
try {
n5.setStatusTime(FORMAT.parse("2016-03-27"));
n5.setUpdateTime(FORMAT.parse("2016-04-01"));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}System.out.println("转化之前n1:" + n5.toString());
PrinterStatusLog n2 = new PrinterStatusLog();
n2.setShopId(1);
n2.setDeviceNumber(3);
n2.setConnectStatus(1);
try {
n2.setStatusTime(FORMAT.parse("2016-03-28"));
n2.setUpdateTime(FORMAT.parse("2016-03-29"));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}System.out.println("转化之前："+"n2:" + n2.toString());
PrinterStatusLog n3 = new PrinterStatusLog();
n3.setShopId(2);
n3.setDeviceNumber(4);
n3.setConnectStatus(1);
try {
n3.setStatusTime(FORMAT.parse("2016-03-29"));
n3.setUpdateTime(FORMAT.parse("2016-04-09"));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("转化之前："+"n3:" + n3.toString());
PrinterStatusLog n4 = new PrinterStatusLog();
n4.setShopId(2);
n4.setDeviceNumber(4);
n4.setConnectStatus(1);
try {
n4.setStatusTime(FORMAT.parse("2016-03-30"));
n4.setUpdateTime(FORMAT.parse("2016-05-01"));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("转化之前："+"n4:" + n4.toString());
PrinterStatusLog n1 = new PrinterStatusLog();
n1.setShopId(1);
n1.setDeviceNumber(2);
n1.setConnectStatus(1);
try {
n1.setStatusTime(FORMAT.parse("2016-03-30"));
n1.setUpdateTime(FORMAT.parse("2016-05-01"));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("转化之前："+"n5:" + n1.toString());
list.add(n1);
list.add(n2);
list.add(n3);
list.add(n4);
list.add(n5);
List printerStatusLogVOs = mergeList(list);
for (PrinterStatusVO a : printerStatusLogVOs) {
System.out.println(a.toString());
} } public static List mergeList(List printerStatusLogs) {
HashMap map = new HashMap();
List printerStatusLogVOs = newPrinterStatusLogVOList(printerStatusLogs);
for (PrinterStatusVO bean : printerStatusLogVOs) {
String keyStr = String.valueOf(bean.getShopId()) + String.valueOf(bean.getDeviceNumber());
if (map.containsKey(keyStr)) {bean.setStatusTime(map.get(keyStr).getStatusTime().compareTo(bean.getStatusTime()) == 1
? map.get(keyStr).getStatusTime() : bean.getStatusTime());
System.out.println("状态："+bean.getConnectStatus());
if (bean.getConnectStatus() == PrintStatusCode.ONLINE) {
if (map.get(keyStr).getFirstTime() == null) {
bean.setFirstTime(bean.getFirstTime());
}if (bean.getFirstTime() == null) {
bean.setFirstTime(map.get(keyStr).getFirstTime());
}if (map.get(keyStr).getFirstTime() != null && bean.getFirstTime() != null) {
bean.setFirstTime(map.get(keyStr).getFirstTime().compareTo(bean.getFirstTime()) == 1
? bean.getFirstTime() : map.get(keyStr).getFirstTime());
}
//问题找到
bean.setLastTime(map.get(keyStr).getLastTime());
} else {
if (map.get(keyStr).getLastTime() == null) {
bean.setLastTime(bean.getLastTime());
}if (bean.getLastTime() == null) {
bean.setLastTime(map.get(keyStr).getLastTime());
System.out.println("map.get(keyStr).getLastTime():"+map.get(keyStr).getLastTime());
}if (map.get(keyStr).getLastTime() != null && bean.getLastTime() != null) {
bean.setLastTime(map.get(keyStr).getLastTime().compareTo(bean.getLastTime()) == 1
? map.get(keyStr).getLastTime() : bean.getLastTime());
}
//问题找到
bean.setFirstTime(map.get(keyStr).getFirstTime());
}bean.setOfflineTimes(map.get(keyStr).getOfflineTimes() + bean.getOfflineTimes());
bean.setOnlineTimes(map.get(keyStr).getOnlineTimes() + bean.getOnlineTimes());
}map.put(keyStr, bean);
System.out.println("map状态："+map.get(keyStr).getConnectStatus()+""+"F："+map.get(keyStr).getFirstTime()+""+"L:"+map.get(keyStr).getLastTime());
}
printerStatusLogVOs.clear();
printerStatusLogVOs.addAll(map.values());
return printerStatusLogVOs;
} private static List newPrinterStatusLogVOList(List list) {
List printerStatusLogVOList = new ArrayList();
for (PrinterStatusLog bean : list) {
// ...HbtShopBO shopBO =
// hobbitShopService.loadShop(bean.getShopId());
PrinterStatusVO printerStatusLogVO = new PrinterStatusVO();
printerStatusLogVO.setShopId(bean.getShopId());
// printerStatusLogVO.setShopName(shopBO.getShopName());
// printerStatusLogVO.setCityName(shopBO.getCityName());
printerStatusLogVO.setDeviceNumber(bean.getDeviceNumber());
printerStatusLogVO.setStatusTime(bean.getStatusTime());
printerStatusLogVO.setConnectStatus(bean.getConnectStatus());
printerStatusLogVO.setOfflineTimes(bean.getConnectStatus() == PrintStatusCode.OFFLINE
? PrintStatusCode.ONLINE : PrintStatusCode.OFFLINE);
printerStatusLogVO.setOnlineTimes(bean.getConnectStatus() == PrintStatusCode.ONLINE ? PrintStatusCode.ONLINE
: PrintStatusCode.OFFLINE);
if (bean.getConnectStatus() == PrintStatusCode.ONLINE) {
printerStatusLogVO.setFirstTime(bean.getUpdateTime());
} else {
printerStatusLogVO.setLastTime(bean.getUpdateTime());
}
System.out.println("转化之后");
System.out.println("转化之后："+printerStatusLogVO.toString());
printerStatusLogVOList.add(printerStatusLogVO);
}
return printerStatusLogVOList;
}
}
【把list中根据相同属性（合为一个），计算不同属性转化为另外一个list】
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