java文件生成

package com.gcy.test.util;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Random;

import org.apache.commons.io.output.FileWriterWithEncoding;
import org.junit.Test;

public class TestGroupGenerator {

    private String TARGET_FILENAME = "group_data";
    private String TARGET_PATH = "/Users/test/" + TARGET_FILENAME;
    Integer[] groupIds = {16,18,19,20,26,27};
    String[] name = {"三坊七巷一店","温泉一店","温泉二店","新港一店","温泉三店","三坊七巷二店"};
    Integer[] deviceCounts = {12,1,1,6,1,5};
    Integer[] onlineCounts = {3,0,4,0,1,1};

    @Test
    public void generateFile() {
        //如果已经存在相同文件则删除
        File targetFile = new File(TARGET_PATH);
        targetFile.delete();

        try {
            writtenFile(targetFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

  //写文件
      void writtenFile(File file) throws IOException {
          //写文件
          file.createNewFile();
          FileWriterWithEncoding fw = new FileWriterWithEncoding(file, "utf-8", true);
          BufferedWriter bw=new BufferedWriter(fw);

          try {
              for(int i = 0; i < deviceCounts.length; i ++) {
                  String onString = "'" + groupIds[i] + "'" + ":{deviceCount:" + deviceCounts[i] + "," +
                                  "onlineCount:" + onlineCounts[0] + "," +
                                  "staCount:" + getInt(100) + "," +
                                  "upFlow:" + getInt(10000) + "," +
                                  "downFlow:" + getInt(10000) + "," +
                                  "gateway:" + getIp() + "," +
                                  "dns:" + getIp() + "," +
                                  "name:" + getString(name[i]) +
                                  "}";
                  bw.write(onString+"\r\n");
              }
              bw.flush();
              fw.flush();
              System.out.println("done");
          } catch (FileNotFoundException e) {
              e.printStackTrace();
          } finally {
              bw.close();
              fw.close();
          }

      }

      private String getString(String ob) {
          return "'" + ob + "'";
      }

      private int getInt(int i) {
          Random rand = new Random();
          return rand.nextInt(i);
      }

      private String getIp() {
          String ip = getInt(255) + "." + getInt(255) + "." + getInt(255) + "." + getInt(255);
          return getString(ip);
      }
}