java操作redis存储对象

在Jedis开发中，我们很多时候希望直接把一个对象放到Redis中，然后在需要的时候取出来。Redis的key和value都支持二进制安全的字符串，存储Java对象不是问题，下面我们看一下如何来实现。

1要存储的对象

现在写一个很土的Java Bean，包含两个字段，id和name，类名叫做Person。为了实现序列化需求，该类实现Serializable接口。

[java] view plain copy print?public class Person implements Serializable { private int id; private String name; public Person(int id, String name) { this.id = id; this.name = name; } public int getId() { return id; } public String getName() { return name; } }

public class Person implements Serializable {
private int id;
private String name;

public Person(int id, String name) {
this.id = id;
this.name = name;
}

public int getId() {
return id;
}

public String getName() {
return name;
}

}

2序列化、反序列化

写一个序列化工具类，来提供对象的序列化和饭序列化的工作。代码如下：

[java] view plain copy print?public class SerializeUtil { public static byte[] serialize(Object object) { ObjectOutputStream oos = null; ByteArrayOutputStream baos = null; try { //序列化 baos = new ByteArrayOutputStream(); oos = new ObjectOutputStream(baos); oos.writeObject(object); byte[] bytes = baos.toByteArray(); return bytes; } catch (Exception e) { } return null; } public static Object unserialize(byte[] bytes) { ByteArrayInputStream bais = null; try { //反序列化 bais = new ByteArrayInputStream(bytes); ObjectInputStream ois = new ObjectInputStream(bais); return ois.readObject(); } catch (Exception e) { } return null; } }

public class SerializeUtil {
public static byte[] serialize(Object object) {
ObjectOutputStream oos = null;
ByteArrayOutputStream baos = null;
try {
//序列化
baos = new ByteArrayOutputStream();
oos = new ObjectOutputStream(baos);
oos.writeObject(object);
byte[] bytes = baos.toByteArray();
return bytes;
} catch (Exception e) {
}
return null;
}

public static Object unserialize(byte[] bytes) {
ByteArrayInputStream bais = null;
try {
//反序列化
bais = new ByteArrayInputStream(bytes);
ObjectInputStream ois = new ObjectInputStream(bais);
return ois.readObject();
} catch (Exception e) {
}
return null;
}
}

3写对象

将Person对象写入Redis中：

[java] view plain copy print?public void setObject() {
Person person = new Person(100, “alan”);
jedis.set(”person:100”.getBytes(
4000
), SerializeUtil.serialize(person));
person = new Person(101, “bruce”);
jedis.set(”person:101”.getBytes(), SerializeUtil.serialize(person));
}

public void setObject() {
Person person = new Person(100, "alan");
jedis.set("person:100".getBytes(), SerializeUtil.serialize(person));
person = new Person(101, "bruce");
jedis.set("person:101".getBytes(), SerializeUtil.serialize(person));
}

运行上面代码之后，我们到命令行窗口中读取该对象，看看有没有写入成功：

[sql] view plain copy print?redis 127.0.0.1:6379> get person:100
”\xac\xed\x00\x05sr\x00\x15alanland.redis.Person\x05\xf4\x8d9A\xf4`\xb0\x02\x00\x02I\x00\x02idL\x00\x04namet\x00\x12Ljava/lang/String;xp\x00\x00\x00dt\x00\x04alan”

redis 127.0.0.1:6379> get person:100
"\xac\xed\x00\x05sr\x00\x15alanland.redis.Person\x05\xf4\x8d9A\xf4`\xb0\x02\x00\x02I\x00\x02idL\x00\x04namet\x00\x12Ljava/lang/String;xp\x00\x00\x00dt\x00\x04alan"

可以取到序列化之后的值。

4取对象

用Jedis获取对象：

[java] view plain copy print?public Person getObject(int id) {
byte[] person = jedis.get((“person:” + id).getBytes());
return (Person) SerializeUtil.unserialize(person);
}

public Person getObject(int id) {
byte[] person = jedis.get(("person:" + id).getBytes());
return (Person) SerializeUtil.unserialize(person);
}

测试一下上一步存入的两个对象：

[java] view plain copy print?Person person = test.getObject(100); System.out.println(person.getId()); System.out.println(person.getName()); person = test.getObject(101); System.out.println(person.getId()); System.out.println(person.getName());

Person person = test.getObject(100);
System.out.println(person.getId());
System.out.println(person.getName());
person = test.getObject(101);
System.out.println(person.getId());
System.out.println(person.getName());

Java控制台输入：

[html] view plain copy print?100 alan 101 bruce

100
alan
101
bruce

由此可见，序列化对象在Redis中存取正确。

转自【http://alanland.iteye.com/admin/blogs/1600685】