版论坛全民公测！ “2012移动开发者大会参会感悟”有奖征文火热进行中 JavaEE参考示例SpringSide作者江南白衣专访
Redis 存储List对象
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分类： NoSQL 2012-06-11 16:33243人阅读评论(0)收藏举报
如果需要用到Redis存储List对象，而list又不需要进行操作，可以按照MC的方式进行存储，不过Jedis之类的客户端没有提供API，可以有两种思路实现：
1. 分别序列化 elements ,然后 set 存储
2. 序列化List对象，set存储
这两种方法都类似MC的 Object方法存储，运用这种方式意味着放弃Redis对List提供的操作方法。
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01.import net.spy.memcached.compat.CloseUtil;
02.import net.spy.memcached.compat.log.Logger;
03.import net.spy.memcached.compat.log.LoggerFactory;
04.import redis.clients.jedis.Client;
05.import redis.clients.jedis.Jedis;
06.import redis.clients.jedis.JedisPool;
07.import redis.clients.jedis.JedisPoolConfig;
08.
09.import java.io.*;
10.import java.util.ArrayList;
11.import java.util.List;
12.import java.util.Random;
13.
14./**
15. * Created by IntelliJ IDEA.
16. * User: lifeng.xu
17. * Date: 12-6-11
18. * Time: 上午11:10
19. * To change this template use File | Settings | File Templates.
20. */
21.public class JedisTest {
22.
23. private static Logger logger = LoggerFactory.getLogger(JedisTest.class);
24.
25. /**
26. * Jedis Pool for Jedis Resource
27. * @return
28. */
29. public static JedisPool buildJedisPool(){
30. JedisPoolConfig config = new JedisPoolConfig();
31. config.setMaxActive(1);
32. config.setMinIdle(50);
33. config.setMaxIdle(3000);
34. config.setMaxWait(5000);
35. JedisPool jedisPool = new JedisPool(config,
36. "*****", ****);
37. return jedisPool;
38. }
39.
40. /**
41. * Test Data
42. * @return
43. */
44. public static List<User> buildTestData(){
45. User a = new User();
46. a.setName("a");
47. User b = new User();
48. b.setName("b");
49. List<User> list = new ArrayList<User>();
50. list.add(a);
51. list.add(b);
52. return list;
53. }
54.
55. /**
56. * Test for
57. */
58. public static void testSetElements(){
59. List<User> testData = buildTestData();
60. Jedis jedis = buildJedisPool().getResource();
61. String key = "testSetElements" + new Random(1000).nextInt();
62. jedis.set(key.getBytes(), ObjectsTranscoder.serialize(testData));
63.
64. //验证
65. byte[] in = jedis.get(key.getBytes());
66. List<User> list = ObjectsTranscoder.deserialize(in);
67. for(User user : list){
68. System.out.println("testSetElements user name is:" + user.getName());
69. }
70. }
71.
72. public static void testSetEnsemble(){
73. List<User> testData = buildTestData();
74. Jedis jedis = buildJedisPool().getResource();
75. String key = "testSetEnsemble" + new Random(1000).nextInt();
76. jedis.set(key.getBytes(), ListTranscoder.serialize(testData));
77.
78. //验证
79. byte[] in = jedis.get(key.getBytes());
80. List<User> list = (List<User>)ListTranscoder.deserialize(in);
81. for(User user : list){
82. System.out.println("testSetEnsemble user name is:" + user.getName());
83. }
84. }
85.
86. public static void main(String[] args) {
87. testSetElements();
88. testSetEnsemble();
89. }
90.
91. public static void close(Closeable closeable) {
92. if (closeable != null) {
93. try {
94. closeable.close();
95. } catch (Exception e) {
96. logger.info("Unable to close %s", closeable, e);
97. }
98. }
99. }
100.
101. static class User implements Serializable{
102. String name;
103.
104. public String getName() {
105. return name;
106. }
107.
108. public void setName(String name) {
109. this.name = name;
110. }
111. }
112.
113. static class ObjectsTranscoder{
114.
115. public static byte[] serialize(List<User> value) {
116. if (value == null) {
117. throw new NullPointerException("Can't serialize null");
118. }
119. byte[] rv=null;
120. ByteArrayOutputStream bos = null;
121. ObjectOutputStream os = null;
122. try {
123. bos = new ByteArrayOutputStream();
124. os = new ObjectOutputStream(bos);
125. for(User user : value){
126. os.writeObject(user);
127. }
128. os.writeObject(null);
129. os.close();
130. bos.close();
131. rv = bos.toByteArray();
132. } catch (IOException e) {
133. throw new IllegalArgumentException("Non-serializable object", e);
134. } finally {
135. close(os);
136. close(bos);
137. }
138. return rv;
139. }
140.
141. public static List<User> deserialize(byte[] in) {
142. List<User> list = new ArrayList<User>();
143. ByteArrayInputStream bis = null;
144. ObjectInputStream is = null;
145. try {
146. if(in != null) {
147. bis=new ByteArrayInputStream(in);
148. is=new ObjectInputStream(bis);
149. while (true) {
150. User user = (User) is.readObject();
151. if(user == null){
152. break;
153. }else{
154. list.add(user);
155. }
156. }
157. is.close();
158. bis.close();
159. }
160. } catch (IOException e) {
161. logger.warn("Caught IOException decoding %d bytes of data",
162. in == null ? 0 : in.length, e);
163. } catch (ClassNotFoundException e) {
164. logger.warn("Caught CNFE decoding %d bytes of data",
165. in == null ? 0 : in.length, e);
166. } finally {
167. CloseUtil.close(is);
168. CloseUtil.close(bis);
169. }
170. return list;
171. }
172. }
173.
174. static class ListTranscoder{
175. public static byte[] serialize(Object value) {
176. if (value == null) {
177. throw new NullPointerException("Can't serialize null");
178. }
179. byte[] rv=null;
180. ByteArrayOutputStream bos = null;
181. ObjectOutputStream os = null;
182. try {
183. bos = new ByteArrayOutputStream();
184. os = new ObjectOutputStream(bos);
185. os.writeObject(value);
186. os.close();
187. bos.close();
188. rv = bos.toByteArray();
189. } catch (IOException e) {
190. throw new IllegalArgumentException("Non-serializable object", e);
191. } finally {
192. close(os);
193. close(bos);
194. }
195. return rv;
196. }
197.
198. public static Object deserialize(byte[] in) {
199. Object rv=null;
200. ByteArrayInputStream bis = null;
201. ObjectInputStream is = null;
202. try {
203. if(in != null) {
204. bis=new ByteArrayInputStream(in);
205. is=new ObjectInputStream(bis);
206. rv=is.readObject();
207. is.close();
208. bis.close();
209. }
210. } catch (IOException e) {
211. logger.warn("Caught IOException decoding %d bytes of data",
212. in == null ? 0 : in.length, e);
213. } catch (ClassNotFoundException e) {
214. logger.warn("Caught CNFE decoding %d bytes of data",
215. in == null ? 0 : in.length, e);
216. } finally {
217. CloseUtil.close(is);
218. CloseUtil.close(bis);
219. }
220. return rv;
221. }
222. }
223.}
PS：Redsi中存储list没有封装对Object的API，是不是也是倾向于只存储用到的字段，而不是存储Object本身呢？Redis是一个In-Mem的产品，会觉得我们应用的方式。
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