waterElectricityService/test2.java

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 * 使用JAVA DOM PARSER：修改 XML 文件
 *
 * @author zfc
 * @date 2017年12月7日 下午8:31:55
 */
public class test2 {
    public static void main(String[] args) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmm");
        String date = sdf.format(new Date());

        Random random = new Random();
        String fourRandom = String.valueOf(random.nextInt(10000));
        int randLength = fourRandom.length();
        //不足4位继续补充
        if(randLength<4){
            for(int remain = 1; remain <= 4 - randLength; remain ++ ){
                fourRandom += random.nextInt(10)  ;
            }
        }
        System.out.println(date+fourRandom);
    }
}