利用Java怎么对redis进行增删查改操作

package redis.main;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
public final class RedisPool {
  //Redis服务器IP
  private static String ADDR = "127.0.0.1";
  //Redis的端口号
  private static int PORT = 6379;
  //访问密码
  private static String AUTH = "123456";
  //可用连接实例的最大数目，默认值为8；
  //如果赋值为-1，则表示不限制；如果pool已经分配了maxActive个jedis实例，则此时pool的状态为exhausted(耗尽)。
  private static int MAX_ACTIVE = 1024;
  //控制一个pool最多有多少个状态为idle(空闲的)的jedis实例，默认值也是8。
  private static int MAX_IDLE = 200;
  //等待可用连接的最大时间，单位毫秒，默认值为-1，表示永不超时。如果超过等待时间，则直接抛出JedisConnectionException；
  private static int MAX_WAIT = 10000;
  private static int TIMEOUT = 10000;
  //在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的；
  private static boolean TEST_ON_BORROW = true;
  private static JedisPool jedisPool = null;
  /**
   * 初始化Redis连接池
   */
  static {
    try {
      JedisPoolConfig config = new JedisPoolConfig();
      //config.setMaxActive(MAX_ACTIVE);
      config.setMaxTotal(MAX_ACTIVE);
      config.setMaxIdle(MAX_IDLE);
      config.setMaxWaitMillis(MAX_WAIT);
      config.setTestOnBorrow(TEST_ON_BORROW);
      jedisPool = new JedisPool(config, ADDR, PORT, TIMEOUT, AUTH);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  /**
   * 获取Jedis实例
   * @return
   */
  public synchronized static Jedis getJedis() {
    try {
      if (jedisPool != null) {
        Jedis resource = jedisPool.getResource();
        return resource;
      } else {
        return null;
      }
    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
  }
  /**
   * 释放jedis资源
   * @param jedis
   */
  public static void returnResource(final Jedis jedis) {
    if (jedis != null) {
      jedisPool.close();
    }
  }
}

package redis.main;
import java.util.Set;
import redis.clients.jedis.Jedis;
/**
 * Hello world!
 *
 */
public class App
{
  public static void main( String[] args )
  {
    insert("username", "xiaoming1");
    System.out.println(get("username"));
    delete("username");
    System.out.println(get("username"));
  }
  static void insert(String key, String value){
     Jedis jedis = RedisPool.getJedis();
     jedis.set(key, value);
  }
  static void delete(String key){
    Jedis jedis = RedisPool.getJedis();
    jedis.del(key);
  }
  static String get(String key){
    Jedis jedis = RedisPool.getJedis();
    return jedis.get(key);
  }
}