mongoDB导出数据库所有集合内容到json文件

package starcLL.webClient;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import org.bson.Document;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.mongodb.BasicDBObject;
import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;
import com.mongodb.MongoException;
import com.mongodb.ServerAddress;
import com.mongodb.client.ListIndexesIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;

@Component
public class MongodbClient {

private static String starcLL_mongodb_ip="填写你的ip";
private static int starcLL_mongodb_port=填写你的端口;
private static String starcLL_mongodb_name="填写你的数据库名";

public static MongoClient mongoClient = null;
public static MongoDatabase database = null;
public static ServerAddress serverAddress = null;
public static MongoCredential credentials = null;
public static List<ServerAddress> addressLists = new ArrayList<ServerAddress>();
public static List<MongoCredential> credentialsLists = new ArrayList<MongoCredential>();

public static MongoClient getMongoClient() {
if (null == mongoClient) {
try {
serverAddress = new ServerAddress(starcLL_mongodb_ip, starcLL_mongodb_port);
addressLists.add(serverAddress);
credentials = MongoCredential.createCredential("数据库", "用户名","密码".toCharArray());
credentialsLists.add(credentials);
return new MongoClient(addressLists,credentialsLists);
} catch (MongoException e) {
System.out.println(e.toString());
}
}
return mongoClient;
}

public static void main(String[] args) throws IOException {
MongoClient mongoClient=getMongoClient();
Set<String> collectionNames=mongoClient.getDB(starcLL_mongodb_name).getCollectionNames();
MongoDatabase mongoDatabase=mongoClient.getDatabase(starcLL_mongodb_name);
System.out.println("开始...");

int i=collectionNames.size();
for (String cName:collectionNames) {
JSONArray jsonArray=new JSONArray();
System.out.println("获取集合："+cName);
MongoCursor<Document> cursor = mongoDatabase.getCollection(cName).find().iterator();
try {
while (cursor.hasNext()) {
jsonArray.add(cursor.next().toJson());
}
} finally {
cursor.close();
}
File txt=new File("C:/Users/Administrator/Desktop/svc/"+i+".json");
if(!txt.exists()){
txt.createNewFile();
}
byte bytes[]=new byte[512];
bytes=jsonArray.toString().getBytes();
int b=jsonArray.toString().length();
FileOutputStream fos=new FileOutputStream(txt);
fos.write(bytes,0,b);
fos.close();
i--;
}

}
}