JAVA实现读写Codis
- POM文件pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<groupId>com.laodixiao.connectToCodisgroupId>
<artifactId>connectToCodisartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<name>connectToCodisname>
<url>http://maven.apache.orgurl>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
properties>
<dependencies>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>3.8.1version>
<scope>testscope>
dependency>
<dependency>
<groupId>redis.clientsgroupId>
<artifactId>jedisartifactId>
<version>2.7.2version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>fastjsonartifactId>
<version>1.2.7version>
dependency>
dependencies>
project>
- MapSort.java实现Map的排序
package com.laodixiao.connectToCodis.connectToCodis;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
public class MapSort {
/**
*
* @param map
* @return
*/
public static super V>> Map sortByValue(Map map) {
List> list = new LinkedList<>(map.entrySet());
Collections.sort(list, new Comparator>() {
@Override
public int compare(Map.Entry o1, Map.Entry o2) {
return -1*(o1.getValue()).compareTo(o2.getValue());
}
});
Map result = new LinkedHashMap<>();
for (Map.Entry entry : list) {
result.put(entry.getKey(), entry.getValue());
}
return result;
}
}
- 实现Codis的读写
package com.laodixiao.connectToCodis.connectToCodis;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.HashMap;
import java.util.Map;
import com.alibaba.fastjson.JSONObject;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
public class connectToCodis {
private static JedisPool pool = null;
/**
* 构建redis连接池
*
* @param ip
* @param port
* @return JedisPool
*/
public static JedisPool getPool() {
if (pool == null) {
JedisPoolConfig config = new JedisPoolConfig();
//最大连接数
config.setMaxTotal(50);
//最大空闲连接数
config.setMaxIdle(10);
//每次释放连接的最大数目
config.setNumTestsPerEvictionRun(1024);
//释放连接的扫描间隔（毫秒）
config.setTimeBetweenEvictionRunsMillis(30000);
//连接最小空闲时间
config.setMinEvictableIdleTimeMillis(1800000);
//连接空闲多久后释放, 当空闲时间>该值 且 空闲连接>最大空闲连接数 时直接释放
config.setSoftMinEvictableIdleTimeMillis(10000);
//获取连接时的最大等待毫秒数,小于零:阻塞不确定的时间,默认-1
config.setMaxWaitMillis(1500);
//在获取连接的时候检查有效性, 默认false
config.setTestOnBorrow(false);
//在空闲时检查有效性, 默认false
config.setTestWhileIdle(true);
//连接耗尽时是否阻塞, false报异常,ture阻塞直到超时, 默认true
config.setBlockWhenExhausted(false);
//10s超長時間
pool = new JedisPool(config, "127.0.0.1", 6767, 10000);
}
return pool;
}
/**
* 返还到连接池
*
* @param pool
* @param redis
*/
public static void returnResource(JedisPool pool, Jedis redis) {
if (redis != null) {
pool.returnResource(redis);
}
}
/**
* codis读取数据
*
* @param key
* @return
*/
public static String get(String key){
String value = null;
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getPool();
jedis = pool.getResource();
value = jedis.get(key);
} catch (Exception e) {
//释放redis对象
pool.returnBrokenResource(jedis);
e.printStackTrace();
} finally {
//返还到连接池
returnResource(pool, jedis);
}
return value;
}
/**
* codis写入数据
* @param key
* @param value
*/
public static void set(String key, String value){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getPool();
jedis = pool.getResource();
jedis.set(key, value);
} catch (Exception e) {
//释放redis对象
pool.returnBrokenResource(jedis);
e.printStackTrace();
} finally {
//返还到连接池
returnResource(pool, jedis);
}
}
@SuppressWarnings("unchecked")
public static void main( String[] args ) throws IOException {
//读取文件./DouBanData/DouBanData.txt
String filePath = "./DouBanData/DouBanData.txt";
File file=new File(filePath);
//保存结果 cid,//////douBanCidKeys,//////cidSortedKeys
File fileSave = new File("./result/SimData.txt");
if(!fileSave.exists()){
fileSave.createNewFile();
}
OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(fileSave), "utf-8");
if(file.isFile() && file.exists()){ //判断文件是否存在
InputStreamReader read = new InputStreamReader(new FileInputStream(file),"utf-8");//考虑到编码格式
BufferedReader bufferedReader = new BufferedReader(read);
String lineTxt = null;
int cnt = 0;
while((lineTxt = bufferedReader.readLine()) != null){
//排序后的结果：cid,//////cidSortedKeys
StringBuffer cidSortedString = new StringBuffer();
String Key = lineTxt.split(",//////")[0];
String douBandListString = lineTxt.split(",//////")[2];
cnt = cnt + 1;
System.out.println(cnt);
//組裝key
String key = "AlgorithmsCommonBid:ITI:"+ Key;
//或取結果
String result = get(key);
/**
* json用法
*/
JSONObject json = JSONObject.parseObject(result);
if(json!=null){
cidSortedString.append(Key+",//////");
cidSortedString.append(douBandListString+",//////");
String rst = json.get("Results").toString().replace('{', ' ').replace('}', ' ').trim();
String[] rstArray = rst.split(",");
Map map = new HashMap();
for (int i=0; i":")[0].replace('"', ' ').trim(), Double.parseDouble(rstArray[i].split(":")[1]));
}
//map按value降序排列
Map mapSorted = MapSort.sortByValue(map);
StringBuffer cidSortedStringTmp = new StringBuffer();
for (Object key1 : mapSorted.keySet()) {
cidSortedStringTmp.append(key1+"/");
}
if (cidSortedStringTmp.length()<=0) {
cidSortedStringTmp.append("/");
}
String strTmpString = cidSortedStringTmp.substring(0,cidSortedStringTmp.length()-1);
cidSortedString.append(strTmpString+"\r\n");
System.out.println(cidSortedString);
osw.write(cidSortedString.toString());
}
}
read.close();
}
//关闭文件输出流
osw.flush();
osw.close();
}
}
“`