<!-------------知识的力量是无限的(当然肯定还有更简单的方法)-----------!>
当我考虑将省市区三级联动数据从mysql转入mongodb时遇到了网上无直接插入mongodb的示例（基本均是mysql插入示例）。于是想到利用json文件直接导入mongodb会比较easy(SQLyog如何导出json?)
在SQLyog中写一个json格式查询语句：（省市区example如下：）看一下就能懂其中规则*
SELECT
'{"code":"' AS a,
cities.`cityid` AS b,
'","name":"' AS c,
cities.`city` AS d,
'","provinceCode":"' AS e,
cities.`provinceid` AS f,
'"}' AS g
FROM cities |
选取复制所有行到剪贴板：
接下来是将导出的json拼接成一个json文件：（在notpad++中以^查找来替换,拼接jsonarray串加array名（记得进行json校验与json压缩处理））
json在线校验URL:http://www.bejson.com/
json在线压缩URL：http://www.sojson.com/yasuo.html
最后以压缩成一个json文件的形式在java代码中解析
主干精华：
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@Test
public void testProCityArea(){
String fileName = "ProvCityArea.geojson";
String path = System.getProperty("user.dir") + "\\src\\main\\webapp\\static\\geojson\\" + fileName;
JSONObject jsonobject = JSONObject.parseObject(FileHelper.readFile(path));
JSONArray provArray = jsonobject.getJSONArray("provinces");
for (Object object : provArray) {
JSONObject provJson = (JSONObject) object;
Province province = new Province(GuidUtils.getInstance().getGuid(), provJson.getString("code"), provJson.getString("name"));
mongoTemplate.insert(province, "province");
}
JSONArray cityArray = jsonobject.getJSONArray("city");
for (Object object : cityArray) {
JSONObject cityJson = (JSONObject) object;
City city = new City(GuidUtils.getInstance().getGuid(), cityJson.getString("code"), cityJson.getString("name"), cityJson.getString("provinceCode"));
mongoTemplate.insert(city, "city");
}
JSONArray areaArray = jsonobject.getJSONArray("area");
for (Object object : areaArray) {
JSONObject areaJson = (JSONObject) object;
Area area = new Area(GuidUtils.getInstance().getGuid(), areaJson.getString("code"), areaJson.getString("name"), areaJson.getString("cityCode"));
mongoTemplate.insert(area, "area");
}
}
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FileHelper:
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import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
public class FileHelper {
public static String readFile(String path){
BufferedReader reader = null;
String laststr = "";
try{
FileInputStream fileInputStream = new FileInputStream(path);
InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "UTF-8");
reader = new BufferedReader(inputStreamReader);
String tempString = null;
while((tempString = reader.readLine()) != null){
laststr += tempString;
}
reader.close();
}catch(IOException e){
e.printStackTrace();
}finally{
if(reader != null){
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return laststr;
}
}
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GuidUtils
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public class GuidUtils {
private static final GuidUtils instance = new GuidUtils();
private GuidUtils(){
}
public static GuidUtils getInstance() {
return instance;
}
public String getGuid() {
UUID uuid = UUID.randomUUID();
String guid = uuid.toString();
guid = guid.replace("-", "");
return guid.toUpperCase();
}
}
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