Java BufferWriter写文件写不进去或缺失数据的解决

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
public class Main {
 public static void main(String[] args) throws IOException {
  String filename = "src/data/write.txt";
  BufferedWriter bw = new BufferedWriter(new FileWriter(filename));
  for (int i = 1; i <= 10; i++) {
   bw.write(i + " ");
  }
  bw.close();
 }
}

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
public class Main {
 public static void main(String[] args) throws IOException {
  String filename = "src/data/write.txt";
  BufferedWriter bw = new BufferedWriter(new FileWriter(filename));
  for (int i = 1; i <= 3000; i++) {
   bw.write(i + " ");
  }
  bw.close();
 }
}

@Test
public void test5(){
    BufferedWriter bufferedWriter = null;
    BufferedReader bufferedReader = null;
    try {
        bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream("G://reader.txt"),"GBK"));
        //写入流,设置缓存区大小为1024K
        bufferedWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("G://writer.txt"),"UTF-8"),1024);
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            bufferedWriter.write(line);
            bufferedWriter.newLine();
        }
    }catch (Exception e){
        log.error("异常:{}",e);
    }finally {
        if (bufferedWriter != null) {
            try {
                //刷新缓存区
                bufferedWriter.flush();
                bufferedWriter.close();
            } catch (IOException e) {
                log.error("关闭输出流异常:{}", e);
            }
        }
        if (bufferedReader != null) {
            try {
                bufferedReader.close();
            } catch (IOException e) {
                log.error("关闭读取流异常:{}", e);
            }
        }
    }
    log.info("安全结束");
}