Question

redis 如何 把文件的内容 存进去

Answer 1

最近学习下redis，作为一个高性能的k/v数据库，如果数据不用swap的话，redis的性能是无以伦比的。最近在做一个系统附件的缓存，试着把附件放到redis试试，写了个保存文件的方法。public class TestRedis{
Jedis redis = new Jedis("localhost");
//序列化方法
public byte[] object2Bytes(Object value) {
if (value == null)
return null;
ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
ObjectOutputStream outputStream;
try {
outputStream = new ObjectOutputStream(arrayOutputStream);
outputStream.writeObject(value);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
arrayOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return arrayOutputStream.toByteArray();
}
//反序列化方法
public Object byte2Object(byte[] bytes) {
if (bytes == null || bytes.length == 0)
return null;
try {
ObjectInputStream inputStream;
inputStream = new ObjectInputStream(new ByteArrayInputStream(bytes));
Object obj = inputStream.readObject();
return obj;
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return null;
}
//保存文件方法
public void setFile(String key,String path){

File fr = new File(path);
redis.set(key.getBytes(), object2Bytes(fr));
}
//读取文件对象方法
public File getFile(String key){
Jedis redis = new Jedis("localhost");
File file = (File)byte2Object(redis.get(key.getBytes()));
return file;
}

public void testFile(String key,String path)throws Exception{
setFile("test", "D:\\test.txt");
File file = getFile("test");
BufferedReader br = new BufferedReader(new FileReader(file));
String record = null;
while ((record = br.readLine()) != null) {
System.out.println("record:"+record);
}

}

public static void main(String[] args) throws Exception{
TestRedisos = new TestRedis();
os.testFile("test", "D:\\test.txt");
}
}