<p></p> <p>不過需要注意的是，redis接受的數據是字符串，對于二進制數據，可以通過base64編碼來解決。具體可參看我的另一篇文章。</p> <p></p> <h1><a name="t3"></a>4.Java訪問redis</h1> <p>redis可以支持多種語言，當然也可以支持Java。</p> <p>首先需要下載redis的java包。jedis.jar。這里提供一個下載地址：<a target="_blank" >redis的Java客戶端jedis</a></p> <p>使用如下：</p> <p></p> <pre code_snippet_id="151033" snippet_file_name="blog_20140110_4_2824204" name="code" class="java">Jedis jedis = new Jedis("192.168.150.135"); jedis.set("100","this is a test"); String data = jedis.get("100"); </pre><br> <br> <p></p> <h1><a name="t4"></a>5.性能測試</h1> <p>測試方法：向redis寫一個1M的數據，分別寫10次，讀10次，計算其耗時。分C++和Java兩個版本進行測試。<br> </p> <h2><a name="t5"></a>C++測試代碼</h2> <p></p> <pre code_snippet_id="151033" snippet_file_name="blog_20140110_5_8505805" name="code" class="cpp">#include <stdio.h> #include "hiredis.h" #include <string.h> #include <time.h> int main(int argc, char **argv) { printf("CLOCKS_PER_SEC:%d\n",CLOCKS_PER_SEC); redisContext *c; redisReply *reply; c = redisConnect((char *)"one-60",6379); char * pData; reply = (redisReply *)redisCommand(c,"GET 0"); int size = strlen(reply->str); pData = new char[size+1]; strcpy(pData,reply->str); freeReplyObject(reply); clock_t start, finish; start = clock(); for(int i=0;i<10; i++) { reply = (redisReply *)redisCommand(c,"GET %d",i); freeReplyObject(reply); } finish = clock(); double duration = (double)(finish - start) / CLOCKS_PER_SEC*1000; printf("GET Time used:%f ms.\n",duration); start = clock(); for(int i=0;i<10; i++) { reply = (redisReply *)redisCommand(c,"SET %d %s",i,pData); freeReplyObject(reply); } finish = clock(); duration = (double)(finish - start) / CLOCKS_PER_SEC*1000; printf("SET Time used:%f ms.\n",duration); delete []pData; redisFree(c); } </pre>測試結果 <p></p> <p></p> <pre code_snippet_id="151033" snippet_file_name="blog_20140110_6_1363508" name="code" class="plain">CLOCKS_PER_SEC:1000000 GET Time used:190.000000 ms. SET Time used:70.000000 ms. </pre><br> <br> <p></p> <h2><a name="t6"></a>Java測試代碼<br> </h2> <p></p> <pre code_snippet_id="151033" snippet_file_name="blog_20140110_7_633160" name="code" class="java">import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.util.Date; import redis.clients.jedis.Jedis; public class JedisTest { public static void main(String[] args) { Jedis jedis = new Jedis("10.100.211.232"); String f = "/tmp/e2.txt.backup"; try { File file = new File(f); BufferedReader reader = new BufferedReader(new FileReader(file)); String data = reader.readLine(); reader.close(); Date start = new Date(); for(int i=0; i<10; i++) { jedis.set(i+"", data); } Date end = new Date(); System.out.println("Set used(ms):"+(end.getTime()-start.getTime())); start = new Date(); for(int i=0; i<10; i++) { String v = jedis.get(i+""); } end = new Date(); System.out.println("Get used(ms):"+(end.getTime()-start.getTime())); }catch (Exception e) { e.printStackTrace(); } jedis.disconnect(); } }</pre><br> |