Redis/java - 写入和读取二进制数据

Question

我正在尝试向/从 Redis 写入和读取 gzip。问题是我尝试将读取的字节保存到文件中并用 gzip 打开它 - 它无效。在 Eclipse 控制台中查看字符串时，这些字符串也不同。

这是我的代码：

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import redis.clients.jedis.Jedis;

public class TestRedis
{

  public static void main(String[] args) throws IOException
  {
    String fileName = "D:/temp/test_write.gz";

    String jsonKey = fileName;

    Jedis jedis = new Jedis("127.0.0.1");

    byte[] jsonContent = ReadFile(new File(fileName).getPath());

    // test-write data we're storing in redis
    FileOutputStream fostream = new FileOutputStream("D:/temp/test_write_before_redis.gz"); // looks ok
    fostream.write(jsonContent);
    fostream.close();

    jedis.set(jsonKey.getBytes(), jsonContent);

    System.out.println("writing, key: " + jsonKey + ",\nvalue: " + new String(jsonContent)); // looks ok

    byte[] readJsonContent = jedis.get(jsonKey).getBytes();
    String readJsonContentString = new String(readJsonContent);
    FileOutputStream fos = new FileOutputStream("D:/temp/test_read.gz"); // invalid gz file :( 
    fos.write(readJsonContent);
    fos.close();

    System.out.println("n\nread json content from redis: " + readJsonContentString);

  }

  private static byte[] ReadFile(String aFilePath) throws IOException
  {
    Path path = Paths.get(aFilePath);
    return Files.readAllBytes(path);
  }

}

Answer 1

您正在使用Jedis.get(String)阅读其中包括内部UTF-8转换。但是使用Jedis.set(byte[], byte[])写不包括这种转换。不匹配可能是因为这个原因。如果是这样，您可以尝试Jedis.get(byte[])从 redis 读取以跳过UTF-8转换。例如

byte[] readJsonContent = jedis.get(jsonKey.getBytes());