本文介紹了Java利用Redis實(shí)現(xiàn)消息隊(duì)列的示例代碼，分享給大家，具體如下：
應(yīng)用場景
為什么要用redis?
二進(jìn)制存儲、java序列化傳輸、IO連接數(shù)高、連接頻繁
一、序列化
這里編寫了一個(gè)java序列化的工具,主要是將對象轉(zhuǎn)化為byte數(shù)組,和根據(jù)byte數(shù)組反序列化成java對象; 主要是用到了ByteArrayOutputStream和ByteArrayInputStream; 注意:每個(gè)需要序列化的對象都要實(shí)現(xiàn)Serializable接口;
其代碼如下:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
package Utils;import java.io.*;/** * Created by Kinglf on 2016/10/17. */public class ObjectUtil { /** * 對象轉(zhuǎn)byte[] * @param obj * @return * @throws IOException */ public static byte[] object2Bytes(Object obj) throws IOException{ ByteArrayOutputStream bo=new ByteArrayOutputStream(); ObjectOutputStream oo=new ObjectOutputStream(bo); oo.writeObject(obj); byte[] bytes=bo.toByteArray(); bo.close(); oo.close(); return bytes; } /** * byte[]轉(zhuǎn)對象 * @param bytes * @return * @throws Exception */ public static Object bytes2Object(byte[] bytes) throws Exception{ ByteArrayInputStream in=new ByteArrayInputStream(bytes); ObjectInputStream sIn=new ObjectInputStream(in); return sIn.readObject(); }} |
二、消息類(實(shí)現(xiàn)Serializable接口)
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
package Model;import java.io.Serializable;/** * Created by Kinglf on 2016/10/17. */public class Message implements Serializable { private static final long serialVersionUID = -389326121047047723L; private int id; private String content; public Message(int id, String content) { this.id = id; this.content = content; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getContent() { return content; } public void setContent(String content) { this.content = content; }} |
三、Redis的操作
利用redis做隊(duì)列,我們采用的是redis中l(wèi)ist的push和pop操作;
結(jié)合隊(duì)列的特點(diǎn):
只允許在一端插入新元素只能在隊(duì)列的尾部FIFO:先進(jìn)先出原則 Redis中l(wèi)push頭入(rpop尾出)或rpush尾入(lpop頭出)可以滿足要求,而Redis中l(wèi)ist藥push或 pop的對象僅需要轉(zhuǎn)換成byte[]即可
java采用Jedis進(jìn)行Redis的存儲和Redis的連接池設(shè)置
上代碼:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
|
package Utils;import redis.clients.jedis.Jedis;import redis.clients.jedis.JedisPool;import redis.clients.jedis.JedisPoolConfig;import java.util.List;import java.util.Map;import java.util.Set;/** * Created by Kinglf on 2016/10/17. */public class JedisUtil { private static String JEDIS_IP; private static int JEDIS_PORT; private static String JEDIS_PASSWORD; private static JedisPool jedisPool; static { //Configuration自行寫的配置文件解析類,繼承自Properties Configuration conf=Configuration.getInstance(); JEDIS_IP=conf.getString("jedis.ip","127.0.0.1"); JEDIS_PORT=conf.getInt("jedis.port",6379); JEDIS_PASSWORD=conf.getString("jedis.password",null); JedisPoolConfig config=new JedisPoolConfig(); config.setMaxActive(5000); config.setMaxIdle(256); config.setMaxWait(5000L); config.setTestOnBorrow(true); config.setTestOnReturn(true); config.setTestWhileIdle(true); config.setMinEvictableIdleTimeMillis(60000L); config.setTimeBetweenEvictionRunsMillis(3000L); config.setNumTestsPerEvictionRun(-1); jedisPool=new JedisPool(config,JEDIS_IP,JEDIS_PORT,60000); } /** * 獲取數(shù)據(jù) * @param key * @return */ public static String get(String key){ String value=null; Jedis jedis=null; try{ jedis=jedisPool.getResource(); value=jedis.get(key); }catch (Exception e){ jedisPool.returnBrokenResource(jedis); e.printStackTrace(); }finally { close(jedis); } return value; } private static void close(Jedis jedis) { try{ jedisPool.returnResource(jedis); }catch (Exception e){ if(jedis.isConnected()){ jedis.quit(); jedis.disconnect(); } } } public static byte[] get(byte[] key){ byte[] value = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); value = jedis.get(key); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } return value; } public static void set(byte[] key, byte[] value) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.set(key, value); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } public static void set(byte[] key, byte[] value, int time) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.set(key, value); jedis.expire(key, time); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } public static void hset(byte[] key, byte[] field, byte[] value) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.hset(key, field, value); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } public static void hset(String key, String field, String value) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.hset(key, field, value); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } /** * 獲取數(shù)據(jù) * * @param key * @return */ public static String hget(String key, String field) { String value = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); value = jedis.hget(key, field); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } return value; } /** * 獲取數(shù)據(jù) * * @param key * @return */ public static byte[] hget(byte[] key, byte[] field) { byte[] value = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); value = jedis.hget(key, field); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } return value; } public static void hdel(byte[] key, byte[] field) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.hdel(key, field); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } /** * 存儲REDIS隊(duì)列 順序存儲 * @param key reids鍵名 * @param value 鍵值 */ public static void lpush(byte[] key, byte[] value) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.lpush(key, value); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } /** * 存儲REDIS隊(duì)列 反向存儲 * @param key reids鍵名 * @param value 鍵值 */ public static void rpush(byte[] key, byte[] value) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.rpush(key, value); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } /** * 將列表 source 中的最后一個(gè)元素(尾元素)彈出，并返回給客戶端 * @param key reids鍵名 * @param destination 鍵值 */ public static void rpoplpush(byte[] key, byte[] destination) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.rpoplpush(key, destination); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } /** * 獲取隊(duì)列數(shù)據(jù) * @param key 鍵名 * @return */ public static List lpopList(byte[] key) { List list = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); list = jedis.lrange(key, 0, -1); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } return list; } /** * 獲取隊(duì)列數(shù)據(jù) * @param key 鍵名 * @return */ public static byte[] rpop(byte[] key) { byte[] bytes = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); bytes = jedis.rpop(key); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } return bytes; } public static void hmset(Object key, Map hash) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.hmset(key.toString(), hash); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } public static void hmset(Object key, Map hash, int time) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.hmset(key.toString(), hash); jedis.expire(key.toString(), time); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } public static List hmget(Object key, String... fields) { List result = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); result = jedis.hmget(key.toString(), fields); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } return result; } public static Set hkeys(String key) { Set result = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); result = jedis.hkeys(key); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } return result; } public static List lrange(byte[] key, int from, int to) { List result = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); result = jedis.lrange(key, from, to); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } return result; } public static Map hgetAll(byte[] key) { Map result = null; Jedis jedis = null; try { jedis = jedisPool.getResource(); result = jedis.hgetAll(key); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } return result; } public static void del(byte[] key) { Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.del(key); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } } public static long llen(byte[] key) { long len = 0; Jedis jedis = null; try { jedis = jedisPool.getResource(); jedis.llen(key); } catch (Exception e) { //釋放redis對象 jedisPool.returnBrokenResource(jedis); e.printStackTrace(); } finally { //返還到連接池 close(jedis); } return len; }} |
四、Configuration主要用于讀取Redis的配置信息
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
package Utils;import java.io.IOException;import java.io.InputStream;import java.util.Properties;/** * Created by Kinglf on 2016/10/17. */public class Configuration extends Properties { private static final long serialVersionUID = -2296275030489943706L; private static Configuration instance = null; public static synchronized Configuration getInstance() { if (instance == null) { instance = new Configuration(); } return instance; } public String getProperty(String key, String defaultValue) { String val = getProperty(key); return (val == null || val.isEmpty()) ? defaultValue : val; } public String getString(String name, String defaultValue) { return this.getProperty(name, defaultValue); } public int getInt(String name, int defaultValue) { String val = this.getProperty(name); return (val == null || val.isEmpty()) ? defaultValue : Integer.parseInt(val); } public long getLong(String name, long defaultValue) { String val = this.getProperty(name); return (val == null || val.isEmpty()) ? defaultValue : Integer.parseInt(val); } public float getFloat(String name, float defaultValue) { String val = this.getProperty(name); return (val == null || val.isEmpty()) ? defaultValue : Float.parseFloat(val); } public double getDouble(String name, double defaultValue) { String val = this.getProperty(name); return (val == null || val.isEmpty()) ? defaultValue : Double.parseDouble(val); } public byte getByte(String name, byte defaultValue) { String val = this.getProperty(name); return (val == null || val.isEmpty()) ? defaultValue : Byte.parseByte(val); } public Configuration() { InputStream in = ClassLoader.getSystemClassLoader().getResourceAsStream("config.xml"); try { this.loadFromXML(in); in.close(); } catch (IOException ioe) { } }} |
五、測試
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
import Model.Message;import Utils.JedisUtil;import Utils.ObjectUtil;import redis.clients.jedis.Jedis;import java.io.IOException;/** * Created by Kinglf on 2016/10/17. */public class TestRedisQueue { public static byte[] redisKey = "key".getBytes(); static { try { init(); } catch (IOException e) { e.printStackTrace(); } } private static void init() throws IOException { for (int i = 0; i < 1000000; i++) { Message message = new Message(i, "這是第" + i + "個(gè)內(nèi)容"); JedisUtil.lpush(redisKey, ObjectUtil.object2Bytes(message)); } } public static void main(String[] args) { try { pop(); } catch (Exception e) { e.printStackTrace(); } } private static void pop() throws Exception { byte[] bytes = JedisUtil.rpop(redisKey); Message msg = (Message) ObjectUtil.bytes2Object(bytes); if (msg != null) { System.out.println(msg.getId() + "----" + msg.getContent()); } }} |
|
1
2
3
4
5
|
每執(zhí)行一次pop()方法,結(jié)果如下:<br>1----這是第1個(gè)內(nèi)容<br>2----這是第2個(gè)內(nèi)容<br>3----這是第3個(gè)內(nèi)容<br>4----這是第4個(gè)內(nèi)容 |
總結(jié)
至此,整個(gè)Redis消息隊(duì)列的生產(chǎn)者和消費(fèi)者代碼已經(jīng)完成
1.Message 需要傳送的實(shí)體類(需實(shí)現(xiàn)Serializable接口)
2.Configuration Redis的配置讀取類,繼承自Properties
3.ObjectUtil 將對象和byte數(shù)組雙向轉(zhuǎn)換的工具類
4.Jedis 通過消息隊(duì)列的先進(jìn)先出(FIFO)的特點(diǎn)結(jié)合Redis的list中的push和pop操作進(jìn)行封裝的工具類
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：http://www.cnblogs.com/kinglf/p/5972300.html
