Redis实战之征服 Redis + Jedis + Spring （三）

一开始以为Spring下操作哈希表，列表，真就是那么土。恍惚间发现“stringRedisTemplate.opsForList()”的强大，抓紧时间恶补下。

通过spring-data-redis完成LINDEX, LLEN, LPOP, LPUSH, LRANGE, LREM, LSET, LTRIM, RPOP, RPUSH命令。其实还有一些命令，当前版本不支持。

不过，这些List的操作方法可以实现队列，堆栈的正常操作，足够用了。

相关链接：

Redis实战

Redis实战之Redis + Jedis

Redis实战之征服 Redis + Jedis + Spring （一）

Redis实战之征服 Redis + Jedis + Spring （二）

Redis实战之征服 Redis + Jedis + Spring （三）

为了简便操作，我使用了StringRedisTemplate。用字符串操作做展示。当然，你可以继续使用RedisTemplate。

闲言少叙，上代码，一目了然：

/**

* Mar 5, 2013

*/

package org.zlex.redis.support;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.data.redis.core.StringRedisTemplate;

import org.springframework.stereotype.Component;

/**

*

* @author snowolf

* @version 1.0

* @since 1.0

*/

@Component("listOps")

public class ListOps {

@Autowired

private StringRedisTemplate stringRedisTemplate;

/**

* 压栈

*

* @param key

* @param value

* @return

*/

public Long push(String key, String value) {

return stringRedisTemplate.opsForList().leftPush(key, value);

}

/**

* 出栈

*

* @param key

* @return

*/

public String pop(String key) {

return stringRedisTemplate.opsForList().leftPop(key);

}

/**

* 入队

*

* @param key

* @param value

* @return

*/

public Long in(String key, String value) {

return stringRedisTemplate.opsForList().rightPush(key, value);

}

/**

* 出队

*

* @param key

* @return

*/

public String out(String key) {

return stringRedisTemplate.opsForList().leftPop(key);

}

/**

* 栈/队列长

*

* @param key

* @return

*/

public Long length(String key) {

return stringRedisTemplate.opsForList().size(key);

}

/**

* 范围检索

*

* @param key

* @param start

* @param end

* @return

*/

public List<String> range(String key, int start, int end) {

return stringRedisTemplate.opsForList().range(key, start, end);

}

/**

* 移除

*

* @param key

* @param i

* @param value

*/

public void remove(String key, long i, String value) {

stringRedisTemplate.opsForList().remove(key, i, value);

}

/**

* 检索

*

* @param key

* @param index

* @return

*/

public String index(String key, long index) {

return stringRedisTemplate.opsForList().index(key, index);

}

/**

* 置值

*

* @param key

* @param index

* @param value

*/

public void set(String key, long index, String value) {

stringRedisTemplate.opsForList().set(key, index, value);

}

/**

* 裁剪

*

* @param key

* @param start

* @param end

*/

public void trim(String key, long start, int end) {

stringRedisTemplate.opsForList().trim(key, start, end);

}

}

/**
* Mar 5, 2013
*/
package org.zlex.redis.support;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

/**
*
* @author snowolf
* @version 1.0
* @since 1.0
*/
@Component("listOps")
public class ListOps {

@Autowired
private StringRedisTemplate stringRedisTemplate;

/**
* 压栈
*
* @param key
* @param value
* @return
*/
public Long push(String key, String value) {
return stringRedisTemplate.opsForList().leftPush(key, value);
}

/**
* 出栈
*
* @param key
* @return
*/
public String pop(String key) {
return stringRedisTemplate.opsForList().leftPop(key);
}

/**
* 入队
*
* @param key
* @param value
* @return
*/
public Long in(String key, String value) {
return stringRedisTemplate.opsForList().rightPush(key, value);
}

/**
* 出队
*
* @param key
* @return
*/
public String out(String key) {
return stringRedisTemplate.opsForList().leftPop(key);
}

/**
* 栈/队列长
*
* @param key
* @return
*/
public Long length(String key) {
return stringRedisTemplate.opsForList().size(key);
}

/**
* 范围检索
*
* @param key
* @param start
* @param end
* @return
*/
public List<String> range(String key, int start, int end) {
return stringRedisTemplate.opsForList().range(key, start, end);
}

/**
* 移除
*
* @param key
* @param i
* @param value
*/
public void remove(String key, long i, String value) {
stringRedisTemplate.opsForList().remove(key, i, value);
}

/**
* 检索
*
* @param key
* @param index
* @return
*/
public String index(String key, long index) {
return stringRedisTemplate.opsForList().index(key, index);
}

/**
* 置值
*
* @param key
* @param index
* @param value
*/
public void set(String key, long index, String value) {
stringRedisTemplate.opsForList().set(key, index, value);
}

/**
* 裁剪
*
* @param key
* @param start
* @param end
*/
public void trim(String key, long start, int end) {
stringRedisTemplate.opsForList().trim(key, start, end);
}
}

这里说明下，例如LPUSH，RPUSH，其实就是从左边压栈，还是从右边压栈的不同命令。可以把堆栈看作是一个从左至右的数组。如果左边压栈，右边出栈，那就是队列的入队/出队操作；如果左边压栈，左边出栈，那就是堆栈操作。

举个具体的例子：

队列操作：LPUSH入队，RPOP出队，同理，可把L|R替换。

堆栈操作：LPUSH压栈，LPOP出栈，同理，可把L|R替换。

下面进行测试用例，初始、结束时，分别做入队、出队操作，期间进行堆栈，队列操作。不用我细说了，看测试用例，很简单！

/**

* Mar 5, 2013

*/

package org.zlex.redis;

import static org.junit.Assert.*;

import java.util.List;

import org.junit.Before;

import org.junit.After;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import org.zlex.redis.support.ListOps;

/**

*

* @author snowolf

* @version 1.0

* @since 1.0

*/

public class ListOpsTest {

private ApplicationContext app;

private ListOps listOps;

private String key = "queue";

@Before

public void before() throws Exception {

app = new ClassPathXmlApplicationContext("applicationContext.xml");

listOps = (ListOps) app.getBean("listOps");

System.out.println("------------IN---------------");

for (int i = 0; i < 5; i++) {

String uid = "u" + i;

System.out.println(uid);

listOps.in(key, uid);

}

}

@After

public void after() {

// ------------OUT---------------

System.out.println("------------OUT---------------");

long length = listOps.length(key);

for (long i = 0; i < length; i++) {

String uid = listOps.out(key);

System.out.println(uid);

}

}

@Test

public void stack() {

// ------------PUSH---------------

String key = "stack";

int len = 5;

System.out.println("------------PUSH---------------");

for (int i = 0; i < len; i++) {

String uid = "u" + System.currentTimeMillis();

System.out.println(uid);

listOps.push(key, uid);

}

long length = listOps.length(key);

assertEquals(len, length);

// ------------POP---------------

System.out.println("------------POP---------------");

for (long i = 0; i < length; i++) {

String uid = listOps.pop(key);

System.out.println(uid);

}

}

@Test

public void index() {

// -------------INDEX-------------

String value = listOps.index(key, 3);

assertEquals("u3", value);

}

@Test

public void range() {

// -------------RANGE-------------

List<String> list = listOps.range(key, 3, 5);

boolean result1 = list.contains("u3");

assertEquals(true, result1);

boolean result2 = list.contains("u1");

assertEquals(false, result2);

}

@Test

public void trim() {

// ------------TRIM---------------

List<String> list = listOps.range(key, 3, 5);

listOps.trim(key, 3, 5);

boolean result3 = list.contains("u1");

assertEquals(false, result3);

}

@Test

public void set() {

// ------------SET-----------------

List<String> list = listOps.range(key, 3, 5);

listOps.set(key, 4, "ux4");

boolean result4 = list.contains("u4");

assertEquals(true, result4);

}

@Test

public void remove() {

// ------------REMOVE-----------------

listOps.remove(key, 4, "u4");

String value = listOps.index(key, 4);

assertEquals(null, value);

}

}

/**
* Mar 5, 2013
*/
package org.zlex.redis;

import static org.junit.Assert.*;

import java.util.List;

import org.junit.Before;
import org.junit.After;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.zlex.redis.support.ListOps;

/**
*
* @author snowolf
* @version 1.0
* @since 1.0
*/
public class ListOpsTest {
private ApplicationContext app;
private ListOps listOps;
private String key = "queue";

@Before
public void before() throws Exception {
app = new ClassPathXmlApplicationContext("applicationContext.xml");
listOps = (ListOps) app.getBean("listOps");

System.out.println("------------IN---------------");
for (int i = 0; i < 5; i++) {
String uid = "u" + i;
System.out.println(uid);
listOps.in(key, uid);
}
}

@After
public void after() {
// ------------OUT---------------
System.out.println("------------OUT---------------");
long length = listOps.length(key);
for (long i = 0; i < length; i++) {
String uid = listOps.out(key);
System.out.println(uid);
}
}

@Test
public void stack() {
// ------------PUSH---------------
String key = "stack";
int len = 5;
System.out.println("------------PUSH---------------");
for (int i = 0; i < len; i++) {
String uid = "u" + System.currentTimeMillis();
System.out.println(uid);
listOps.push(key, uid);
}

long length = listOps.length(key);
assertEquals(len, length);

// ------------POP---------------
System.out.println("------------POP---------------");
for (long i = 0; i < length; i++) {
String uid = listOps.pop(key);
System.out.println(uid);
}
}

@Test
public void index() {

// -------------INDEX-------------
String value = listOps.index(key, 3);
assertEquals("u3", value);
}

@Test
public void range() {
// -------------RANGE-------------
List<String> list = listOps.range(key, 3, 5);
boolean result1 = list.contains("u3");
assertEquals(true, result1);

boolean result2 = list.contains("u1");
assertEquals(false, result2);
}

@Test
public void trim() {
// ------------TRIM---------------
List<String> list = listOps.range(key, 3, 5);
listOps.trim(key, 3, 5);
boolean result3 = list.contains("u1");
assertEquals(false, result3);
}

@Test
public void set() {
// ------------SET-----------------
List<String> list = listOps.range(key, 3, 5);
listOps.set(key, 4, "ux4");
boolean result4 = list.contains("u4");
assertEquals(true, result4);

}

@Test
public void remove() {
// ------------REMOVE-----------------
listOps.remove(key, 4, "u4");
String value = listOps.index(key, 4);
assertEquals(null, value);

}
}

回头继续整理，这个套路没错！

相关链接：

Redis实战

Redis实战之Redis + Jedis

Redis实战之征服 Redis + Jedis + Spring （一）

Redis实战之征服 Redis + Jedis + Spring （二）

Redis实战之征服 Redis + Jedis + Spring （三）