一段生成大数据测试数据的java code 片段

package com.oracle.log.test;

import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.net.URLEncoder;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;
import java.util.UUID;

public class RandomLog {
	public static String day ="20150632";
	public static String pre_url ="http%3A%2F%2Flocalhost%3A8080%2FBIG_DATA_LOG2%2Fdemo";
	static String[] enArr = { "e_l", "e_pv"};
	static List<String> uids =new ArrayList<String>();
	static List<String> sids =new ArrayList<String>();
	static String [] mids={"Mary", "Patricia", "Linda", "Barbara", "Elizabeth", "Jennifer", "Maria", "Susan",
		      "Margaret", "Dorothy", "Lisa", "Nancy", "Karen", "Betty", "Helen", "Sandra", "Donna",
		      "Carol", "Ruth", "Jeanne"};
	
	static Random r = new Random();
	
	
	static String [] browsers = {"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.71 Safari/537.36",
			"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; GWX:QUALIFIED; rv:11.0) like Gecko",		
			"Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0"};
	
	public static void main(String[] args) {
		FileWriter writer =null;
		try {
			writer = new FileWriter("F://access2.log", true);
		
		for (int j = 0; j < 50000; j++) {
			String[] d=getDatetime(day);
			StringBuilder str = new StringBuilder();
			int i1 = r.nextInt(255);
			int i2 = r.nextInt(255);
			int i3 = r.nextInt(255);
			int i4 = r.nextInt(255);
			str.append(i1+"."+i2+"."+i3+"."+i4);
			str.append("^A"+d[0]);
			str.append("^A"+59410+"^A/log.gif?");
			str.append("ver=1&pl=website&sdk=js&l=zh-CN&b_rst=1536*864&c_time="+d[1]);
			
			if((r.nextInt(10)>4&&uids.size()<10000)|| j<20){//新用户
				String uid =UUID.randomUUID().toString();
				String sid =UUID.randomUUID().toString();
				uids.add(uid);
				sids.add(sid);
				String browserInfo =browsers[r.nextInt(3)];
				writer.write(getP_l(str, uid, sid, browserInfo));
				writer.write(getP_V(str, uid, sid, mids[r.nextInt(mids.length)], browserInfo));
				
			}else{
				int i =r.nextInt(uids.size());
				String uid =uids.get(i);
				String sid =sids.get(i);
				String browserInfo =browsers[r.nextInt(3)];
				writer.write(getP_V(str, uid, sid, mids[r.nextInt(mids.length)], browserInfo));
			}
			
		}
		System.out.println(sids.size()+"-----"+uids.size());
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			try {
				writer.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
		
	
	public static String getP_l(StringBuilder str ,String uid,String sid,String binfo)throws Exception{
		str.append("&en=e_l&u_ud="+uid);
		str.append("&u_sd="+sid);
		str.append("&b_iev="+URLEncoder.encode(binfo, "UTF-8"));
		str.append("\r\n");
		return  str.toString();
	}
	
	public static String getP_V(StringBuilder str ,String uid,String sid,String mid,String binfo)throws Exception{
		str.append("&en=e_pv&u_ud="+uid);
		str.append("&u_sd="+sid);
		str.append("&u_mid="+sid);
		str.append("&b_iev="+URLEncoder.encode(binfo, "UTF-8"));
		int i =r.nextInt(1000);
		if(i<900){
			str.append("&p_url="+pre_url+r.nextInt(200)+".jsp");
			str.append("&p_ref="+pre_url+r.nextInt(200)+".jsp");
		}else{
			str.append("&p_url="+pre_url+r.nextInt(200)+".jsp");
		}
		str.append("\r\n");
		return  str.toString();
	}
	
	public static String[] getDatetime(String day)throws Exception{
		String d = day+String.format("%02d%02d%02d",new Object[]{r.nextInt(24),r.nextInt(60),r.nextInt(60)});
		Date date = new SimpleDateFormat("yyyyMMddHHmmss").parse(d);
		String datetime =date.getTime()+"";
		String prefix =datetime.substring(0, datetime.length()-3);
		String i =r.nextInt(1000)+"";
		if(i.length()==2){
			i="0"+i;
		}else if (i.length()==1){
			i="00"+i;
		}
		return new String[]{prefix+"."+i,datetime};
	}
}