Java利用Redis实现消息队列的示例代码

2025-05-29 0 38

本文介绍了Java利用Redis实现消息队列的示例代码,分享给大家,具体如下:

应用场景

为什么要用redis?

二进制存储、java序列化传输、IO连接数高、连接频繁

一、序列化

这里编写了一个java序列化的工具,主要是将对象转化为byte数组,和根据byte数组反序列化成java对象; 主要是用到了ByteArrayOutputStream和ByteArrayInputStream; 注意:每个需要序列化的对象都要实现Serializable接口;

其代码如下:

?

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 {

/**

* 对象转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[]转对象

* @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、消息类(实现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做队列,我们采用的是redis中list的push和pop操作;

结合队列的特点:

只允许在一端插入新元素只能在队列的尾部FIFO:先进先出原则 Redis中lpush头入(rpop尾出)或rpush尾入(lpop头出)可以满足要求,而Redis中list药push或 pop的对象仅需要转换成byte[]即可

java采用Jedis进行Redis的存储和Redis的连接池设置

上代码:

?

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自行写的配置文件解析类,继承自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);

}

/**

* 获取数据

* @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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

close(jedis);

}

}

/**

* 获取数据

*

* @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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

close(jedis);

}

return value;

}

/**

* 获取数据

*

* @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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

close(jedis);

}

}

/**

* 存储REDIS队列 顺序存储

* @param key reids键名

* @param value 键值

*/

public static void lpush(byte[] key, byte[] value) {

Jedis jedis = null;

try {

jedis = jedisPool.getResource();

jedis.lpush(key, value);

} catch (Exception e) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

close(jedis);

}

}

/**

* 存储REDIS队列 反向存储

* @param key reids键名

* @param value 键值

*/

public static void rpush(byte[] key, byte[] value) {

Jedis jedis = null;

try {

jedis = jedisPool.getResource();

jedis.rpush(key, value);

} catch (Exception e) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

close(jedis);

}

}

/**

* 将列表 source 中的最后一个元素(尾元素)弹出,并返回给客户端

* @param key reids键名

* @param destination 键值

*/

public static void rpoplpush(byte[] key, byte[] destination) {

Jedis jedis = null;

try {

jedis = jedisPool.getResource();

jedis.rpoplpush(key, destination);

} catch (Exception e) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

close(jedis);

}

}

/**

* 获取队列数据

* @param key 键名

* @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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

close(jedis);

}

return list;

}

/**

* 获取队列数据

* @param key 键名

* @return

*/

public static byte[] rpop(byte[] key) {

byte[] bytes = null;

Jedis jedis = null;

try {

jedis = jedisPool.getResource();

bytes = jedis.rpop(key);

} catch (Exception e) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

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) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

close(jedis);

}

return result;

}

public static void del(byte[] key) {

Jedis jedis = null;

try {

jedis = jedisPool.getResource();

jedis.del(key);

} catch (Exception e) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

close(jedis);

}

}

public static long llen(byte[] key) {

long len = 0;

Jedis jedis = null;

try {

jedis = jedisPool.getResource();

jedis.llen(key);

} catch (Exception e) {

//释放redis对象

jedisPool.returnBrokenResource(jedis);

e.printStackTrace();

} finally {

//返还到连接池

close(jedis);

}

return len;

}

}

四、Configuration主要用于读取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、测试

?

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, "这是第" + i + "个内容");

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
每执行一次pop()方法,结果如下:

<br>1----这是第1个内容

<br>2----这是第2个内容

<br>3----这是第3个内容

<br>4----这是第4个内容

总结

至此,整个Redis消息队列的生产者和消费者代码已经完成

1.Message 需要传送的实体类(需实现Serializable接口)

2.Configuration Redis的配置读取类,继承自Properties

3.ObjectUtil 将对象和byte数组双向转换的工具类

4.Jedis 通过消息队列的先进先出(FIFO)的特点结合Redis的list中的push和pop操作进行封装的工具类

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持快网idc。

原文链接:http://www.cnblogs.com/kinglf/p/5972300.html

收藏 (0) 打赏

感谢您的支持,我会继续努力的!

打开微信/支付宝扫一扫,即可进行扫码打赏哦,分享从这里开始,精彩与您同在
点赞 (0)

声明:本站所有文章,如无特殊说明或标注,均为本站原创发布。任何个人或组织,在未征得本站同意时,禁止复制、盗用、采集、发布本站内容到任何网站、书籍等各类媒体平台。如若本站内容侵犯了原著者的合法权益,可联系我们进行处理。

快网idc优惠网 建站教程 Java利用Redis实现消息队列的示例代码 https://www.kuaiidc.com/115536.html

相关文章

发表评论
暂无评论