第十篇 Spring 集成Redis（下）

<servlet>
    <description></description>
    <display-name>DispatcherServlet</display-name>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <description></description>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:conf/spring-*.xml</param-value>  --此处包含所有spring配置文件
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>

/**
 * ArticleServiceImp.java
 */
package com.zzipsun.service.imp;
import java.sql.Array;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import javax.annotation.Resource;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import com.zzipsun.dao.ArticleDao;
import com.zzipsun.entity.Article;
import com.zzipsun.service.base.ArticleService;
import com.zzipsun.util.Log4JUtil;
import com.zzipsun.util.RedisUtil;
/**
 * @author zs
 *
 */
@Service("articleService")
public class ArticleServiceImp implements ArticleService {
  Logger log=Logger.getLogger(ArticleServiceImp.class);
@Resource
ArticleDao  articleDao;
@Value("#{jdbc.pagesize}")
int  pageSize;
@Resource
RedisUtil redisUtil;
  /* (non-Javadoc)
   * @see com.zzipsun.service.base.ArticleService#findArticleById(java.lang.String)
   */
  //查看一个文章
  public Article findArticleById(String articleId) {
    if(articleId.trim()==""||articleId==null) {
      throw new RuntimeException("您查看的文章找不到了");
    }
    //尝试从redis缓冲中获取map中的article实体对象
    Article article=(Article)redisUtil.hget("article", articleId);
    if(article!=null) {
      log.debug("redis中的id为"+articleId+"的article标题为"+article.getTitle());
    }
    //如果redis缓存中不存在此文章
    if(article==null) {
      //数据库查询
      article=articleDao.findArticleById(articleId);
      //存入redis中
      redisUtil.hset("article", articleId, article);
    }
    return article;
  }
}