ElasticSearch：个人博客搜索及首页展示

前言

最近学习了SpringBoot，搞了一个小型博客系统，在这个系统中的首页内容展示、全文搜索用到了elasticsearch。系统中持久层使用的是Springdata，但是没有使用spring-data-elasticsearch，而是单独引入的elasticsearch、transport依赖。下面就将我系统中涉及到的关于elasticsearch的代码贴出来、供大家一起学习。

准备环境

window系统安装zip版，直接解压就可以。

引入依赖

        
            org.elasticsearch.client
            transport
            5.5.2
        
        
           org.elasticsearch
           elasticsearch
           5.5.2
        

返回数据包装类EsBlogVO

用来包装elasticsearch返回的数据。

public class EsBlogVO implements Serializable {

    private static final long serialVersionUID = 1L;

    private String id;

    private Long blogId; // Blog 的 id

    private String title;

    private String summary;

    private String content;

    private String username;

    private String avatar;

    private Timestamp createTime;

    private Integer readSize = 0; // 访问量、阅读量

    private Integer commentSize = 0; // 评论量

    private Integer voteSize = 0; // 点赞量

    private String tags; // 标签  

    public EsBlogVO(){

    }

    public EsBlogVO(Blog blog){
        this.blogId = blog.getId();
        this.title = blog.getTitle();
        this.summary = blog.getSummary();
        this.content = blog.getContent();
        this.username = blog.getUser().getUsername();
        this.avatar = blog.getUser().getAvatar();
        this.createTime = blog.getCreateTime();
        this.readSize = blog.getReading();
        this.commentSize = blog.getCommentSize();
        this.voteSize = blog.getVoteSize();
        this.tags = blog.getTags();
    }

    public void update(Blog blog){
        this.blogId = blog.getId();
        this.title = blog.getTitle();
        this.summary = blog.getSummary();
        this.content = blog.getContent();
        this.username = blog.getUser().getUsername();
        this.avatar = blog.getUser().getAvatar();
        this.createTime = blog.getCreateTime();
        this.readSize = blog.getReading();
        this.commentSize = blog.getCommentSize();
        this.voteSize = blog.getVoteSize();
        this.tags = blog.getTags();
    }

    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }

    public Long getBlogId() {
        return blogId;
    }
    public void setBlogId(Long blogId) {
        this.blogId = blogId;
    }

    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }

    public String getSummary() {
        return summary;
    }
    public void setSummary(String summary) {
        this.summary = summary;
    }

    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }

    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }

    public String getAvatar() {
        return avatar;
    }
    public void setAvatar(String avatar) {
        this.avatar = avatar;
    }

    public Timestamp getCreateTime() {
        return createTime;
    }
    public void setCreateTime(Timestamp createTime) {
        this.createTime = createTime;
    }

    public Integer getReadSize() {
        return readSize;
    }
    public void setReadSize(Integer readSize) {
        this.readSize = readSize;
    }

    public Integer getCommentSize() {
        return commentSize;
    }
    public void setCommentSize(Integer commentSize) {
        this.commentSize = commentSize;
    }

    public Integer getVoteSize() {
        return voteSize;
    }
    public void setVoteSize(Integer voteSize) {
        this.voteSize = voteSize;
    }

    public String getTags() {
        return tags;
    }
    public void setTags(String tags) {
        this.tags = tags;
    }

    @Override
    public String toString() {
        return "EsBlogVO [id=" + id + ", blogId=" + blogId + ", title=" + title + ", summary=" + summary + ", content="
                + content + ", username=" + username + ", avatar=" + avatar + ", createTime=" + createTime
                + ", readSize=" + readSize + ", commentSize=" + commentSize + ", voteSize=" + voteSize + ", tags="
                + tags + "]";
    }

分页PageBean

系统中持久层用到的是SpringData框架，他有自己的Page，为了方便与前端pageHtml中的属性不冲突，依照SpringData的page自己写了一个PageBean。

public class PageBean implements Serializable {

    private static final long serialVersionUID = 1L;

    //当前页面
    private int number;
    //页面大小
    private int size;
    //总页数
    @SuppressWarnings("unused")  
    private int totalPages;
    //总记录数
    private int totalElements;
    //是否是第一个
    @SuppressWarnings("unused")  
    private boolean first;
    //是否是最后一个
    @SuppressWarnings("unused")  
    private boolean last;
    //是否有上一页
    @SuppressWarnings("unused")  
    private boolean hasPrevious;
    //是否有下一页
    @SuppressWarnings("unused")  
    private boolean hasNext;
    //页数位置
    @SuppressWarnings("unused")  
    private int offSet;

    private List contentList;


    public PageBean() {

    }

    public PageBean(int number, int size) {
        super();
        this.number = number;
        this.size = size;
    }

    public PageBean(int number, int size, int totalElements) {
        super();
        this.number = number;
        this.size = size;
        this.totalElements = totalElements;
    }

    public int getNumber() {
        return number;
    }
    public void setNumber(int number) {
        this.number = number;
    }

    public int getSize() {
        return size;
    }
    public void setSize(int size) {
        this.size = size;
    }
    /**
     * 计算页数
     * @return
     */
    public int getTotalPages() {
        return (int) Math.ceil((double) totalElements / (double) getSize());
    }
    public void setTotalPages(int totalPages) {
        this.totalPages = totalPages;
    }

    public int getTotalElements() {
        return totalElements;
    }
    public void setTotalElements(int totalElements) {
        this.totalElements = totalElements;
    }

    public boolean isFirst() {
        return !isHasPrevious();
    }
    public void setFirst(boolean first) {
        this.first = first;
    }
    /**
     * 计算位置
     * @return
     */
    public int getOffSet() {
        return this.number * this.size;
    }
    public void setOffSet(int offSet) {
        this.offSet = offSet;
    }

    public boolean isLast() {
        return !isHasNext();  
    }
    public void setLast(boolean last) {
        this.last = last;
    }

    public boolean isHasPrevious() {
        return getNumber() > 0;
    }
    public void setHasPrevious(boolean hasPrevious) {
        this.hasPrevious = hasPrevious;
    }

    public boolean isHasNext() {
        return (number == getTotalPages()) ? false : true;
    }
    public void setHasNext(boolean hasNext) {
        this.hasNext = hasNext;
    }

    public List getContentList() {
        return contentList;
    }
    public void setContentList(List contentList) {
        this.contentList = contentList;
    }
}

EsRepositity

博客中涉及到的elastcisearch所有业务代码

@Component
public class EsBlogRepository {

    private static final String String = null;

    @Autowired
    private TransportClient client;

    @Autowired
    private UserRepository userRepository;

    /**
     * 根据id查询document
     * @param id
     * @return
     * @throws InvocationTargetException 
     * @throws IllegalAccessException 
     * @throws ParseException 
     */
    public EsBlogVO getEsBlogByBlogId(Long blogId) throws IllegalAccessException, InvocationTargetException, ParseException {

        TermQueryBuilder termQuery = QueryBuilders.termQuery("blogId", blogId);

        SearchResponse searchResponse = this.client.prepareSearch("myblog")
                            .setTypes("blog")
                            .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) //设置查询类型：1.SearchType.DFS_QUERY_THEN_FETCH 精确查询； 2.SearchType.SCAN 扫描查询,无序
                            .setQuery(termQuery)
                            .get();

        EsBlogVO esBlogVo = null;
        for(SearchHit hit:searchResponse.getHits()) {
            //
            esBlogVo = new EsBlogVO();
            Map source = hit.getSource();
            //将id存放到Map中
            source.put("id", hit.getId());
            //转化时间
            String date = (java.lang.String) source.get("createTime");

            if( date!=null && !(date.equals(""))) {
                 date = date.replace("Z", " UTC");//注意是空格+UTC
                    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS Z");//注意格式化的表达式
                    Date d = format.parse(date );
                    SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    
                    String sdate=format2.format(d);        
                    Timestamp fTimestamp=Timestamp.valueOf(sdate);   
                    //将转化后的时间存放到map中
                    source.put("createTime", fTimestamp);
            }
            //将map转化为Bean
            BeanUtils.populate(esBlogVo, source);
            break;
        }
        System.out.println(esBlogVo);
        return esBlogVo;
    }
    /**
     * 删除索引中的document
     * @param esBlogId
     */
    public void deleteEsBlog(String esBlogId) {
        DeleteResponse response = client.prepareDelete("myblog", "blog", esBlogId).get(); 
        Result result = response.getResult();
        System.out.println(result);
    }
    /**
     * 将document添加到索引中
     * @param blog
     * @throws IOException
     */
    public void addEsBlog(EsBlogVO blog) throws IOException {

        IndexResponse response = client.prepareIndex("myblog", "blog")  
                .setSource(XContentFactory.jsonBuilder()  
                        .startObject()  
                            .field("blogId", blog.getBlogId())  
                            .field("title", blog.getTitle())  
                            .field("summary",blog.getSummary())  
                            .field("content", blog.getContent())  
                            .field("username", blog.getUsername())  
                            .field("avatar", blog.getAvatar())  
                            .field("createTime",blog.getCreateTime())  
                            .field("readSize", blog.getReadSize())  
                            .field("commentSize", blog.getCommentSize())  
                            .field("voteSize", blog.getVoteSize())  
                            .field("tags",blog.getTags())  
                        .endObject())  
                .get();
        System.out.println(response.getResult()+","+response.getId());
    }
    /**
     * 修改索引中的document数据
     * @param blog
     * @throws IOException
     */
    public void updateEsblog(EsBlogVO blog) throws IOException {

        UpdateResponse response = client.prepareUpdate("myblog", "blog",blog.getId())  
                .setDoc(XContentFactory.jsonBuilder()  
                        .startObject()  
                        .field("blogId", blog.getBlogId())  
                        .field("title", blog.getTitle())  
                        .field("summary",blog.getSummary())  
                        .field("content", blog.getContent())  
                        .field("username", blog.getUsername())  
                        .field("avatar", blog.getAvatar())  
                        .field("createTime",blog.getCreateTime())  
                        .field("readSize", blog.getReadSize())  
                        .field("commentSize", blog.getCommentSize())  
                        .field("voteSize", blog.getVoteSize())  
                        .field("tags",blog.getTags())  
                        .endObject())  
                .get();  
        System.out.println(response.getResult());
    }
    /**
     * 查询前三十个标签
     * @return
     */
    public List listTop30tags(){
        List list = new ArrayList<>();
        //进行聚合查询,terms按照某个字段中进行分组  
        TermsAggregationBuilder termsAggregationBuilder = AggregationBuilders  
                .terms("tags")    //aggs的名称，自定义，取数据的时候与其一致即可  
                .field("tags")             //需要分组的字段  
                .order(Terms.Order.count(false));  //true表asc按照doc_count排序，false表示desc排序       

        //查询数据进行聚合分析  
        SearchResponse response = client.prepareSearch("myblog").setTypes("blog")  
                .addAggregation(termsAggregationBuilder)  
                .setSize(30)  
                .execute()  
                .actionGet();  
        //获取聚合   
        StringTerms modelTerms = (StringTerms) response.getAggregations().asMap().get("tags");
        Iterator modelBucketIt = modelTerms.getBuckets().iterator();
        //遍历桶
        while(modelBucketIt.hasNext()) {
             Bucket actiontypeBucket = modelBucketIt.next();
             list.add(new TagVO(actiontypeBucket.getKey().toString(),
                     actiontypeBucket.getDocCount()));

        }
        return list;
    }

    /**
     * 获取前12个user
     * @return
     */
    public List listTop12Users(){
        List usernamelist = new ArrayList<>();
        //进行聚合查询,terms按照某个字段中进行分组  
        TermsAggregationBuilder termsAggregationBuilder = AggregationBuilders  
                .terms("usernames")    //aggs的名称，自定义，取数据的时候与其一致即可  
                .field("username")             //需要分组的字段  
                .order(Terms.Order.count(false));  //true表asc按照doc_count排序，false表示desc排序       

        //查询数据进行聚合分析  
        SearchResponse response = client.prepareSearch("myblog").setTypes("blog")  
                .addAggregation(termsAggregationBuilder)  
                .setSize(12)  
                .execute()  
                .actionGet();  
        //获取聚合   
        StringTerms modelTerms = (StringTerms) response.getAggregations().asMap().get("usernames");
        Iterator modelBucketIt = modelTerms.getBuckets().iterator();
        //遍历桶
        while(modelBucketIt.hasNext()) {
             Bucket actiontypeBucket = modelBucketIt.next();
             String username = actiontypeBucket.getKey().toString();
             usernamelist.add(username);
        }
        List list = userRepository.findByUsernameIn(usernamelist);
        return list;
    }

    /**
     * 搜索条件的总数
     * @param title
     * @param Summary
     * @param content
     * @param tags
     * @return
     */
    public Integer findTotalElementBySearchtxt(String title, String Summary, String content, String tags) {
        //建立bool查询
        BoolQueryBuilder boolBuilder = QueryBuilders.boolQuery();
        //使用should实现或者查询
        boolBuilder.should(QueryBuilders.matchQuery("title",title));
        boolBuilder.should(QueryBuilders.matchQuery("summary",Summary));
        boolBuilder.should(QueryBuilders.matchQuery("content",content));
        boolBuilder.should(QueryBuilders.matchQuery("tags",tags));
        //查询
        SearchRequestBuilder searchRequestBuilder = this.client.prepareSearch("myblog")
                .setTypes("blog")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) //设置查询类型：1.SearchType.DFS_QUERY_THEN_FETCH 精确查询； 2.SearchType.SCAN 扫描查询,无序
                .setQuery(boolBuilder);
        //执行结果
        SearchResponse response = searchRequestBuilder.get();
        long totalHits = response.getHits().totalHits;
        return new Long(totalHits).intValue();
    }

    /**
     * 根据搜索条件进行查询，查询结果高亮显示，数据分页
     * @param title
     * @param Summary
     * @param content
     * @param tags
     * @param pageable
     * @return
     * @throws ParseException 
     * @throws InvocationTargetException 
     * @throws IllegalAccessException 
     */
    public PageBean findByTitleOrSummaryOrTagsOrContent(String title, String Summary, String content, String tags,
            PageBean pageable) throws ParseException, IllegalAccessException, InvocationTargetException {

        //建立bool查询
        BoolQueryBuilder boolBuilder = QueryBuilders.boolQuery();
        //使用should实现或者查询
        boolBuilder.should(QueryBuilders.matchQuery("title",title));
        boolBuilder.should(QueryBuilders.matchQuery("summary",Summary));
        boolBuilder.should(QueryBuilders.matchQuery("content",content));
        boolBuilder.should(QueryBuilders.matchQuery("tags",tags));
        //查询
        SearchRequestBuilder searchRequestBuilder = this.client.prepareSearch("myblog")
                .setTypes("blog")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) //设置查询类型：1.SearchType.DFS_QUERY_THEN_FETCH 精确查询； 2.SearchType.SCAN 扫描查询,无序
                .setQuery(boolBuilder)
                .setFrom(pageable.getOffSet())
                .setSize(pageable.getSize());
        // 设置高亮显示
        HighlightBuilder highlightBuilder = new HighlightBuilder().field("*").requireFieldMatch(false);
        highlightBuilder.preTags("");
        highlightBuilder.postTags("");
        searchRequestBuilder.highlighter(highlightBuilder);
        // 执行结果
         //执行结果
        SearchResponse response = searchRequestBuilder.get();
        //接受结果
        List result = new ArrayList();

        //遍历结果
        //SearchHits hits = response.getHits();
        for(SearchHit hits:response.getHits()){
            //实例化对象
            EsBlogVO esBlogVo = new EsBlogVO();
            //获得查询数据
            Map source = hits.getSource();
            //转化时间
            String date = (java.lang.String) source.get("createTime");
            date = date.replace("Z", " UTC");//注意是空格+UTC
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS Z");//注意格式化的表达式
            Date d = format.parse(date );
            SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    
            String sdate=format2.format(d);        
            Timestamp fTimestamp=Timestamp.valueOf(sdate);   
            //将转化后的时间存放到map中
            source.put("createTime", fTimestamp);
            //将map转化为Bean
            BeanUtils.populate(esBlogVo, source);

            //处理高亮片段
            Map highlightFields = hits.getHighlightFields();
            //title
            HighlightField titleField = highlightFields.get("title");
            if(titleField!=null){
                Text[] fragments = titleField.fragments();
                String titleTmp ="";
                for(Text text:fragments){
                    titleTmp+=text;
                }
                //将高亮片段组装到结果中去
                esBlogVo.setTitle(titleTmp);
            }
            //summary
            HighlightField summary = highlightFields.get("summary");
            if(summary != null) {
                Text[] fragmentSummary = summary.fragments();
                String summaryTmp = "";
                for(Text sum:fragmentSummary) {
                    summaryTmp += sum;
                }
                esBlogVo.setSummary(summaryTmp);
            }
            //将查询出来的结果放到集合当中
            result.add(esBlogVo);
        }
        pageable.setContentList(result);
        return pageable;
    }
    /**
     * 按最热查询
     * @param keyword
     * @param pageable
     * @return
     * @throws ParseException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public PageBean listHotstEsBlogs(String keyword,PageBean pageable) throws ParseException, IllegalAccessException, InvocationTargetException{
        //建立bool查询
        BoolQueryBuilder boolBuilder = QueryBuilders.boolQuery();
        //使用should实现或者查询
        boolBuilder.should(QueryBuilders.matchQuery("title",keyword));
        boolBuilder.should(QueryBuilders.matchQuery("summary",keyword));
        boolBuilder.should(QueryBuilders.matchQuery("content",keyword));
        boolBuilder.should(QueryBuilders.matchQuery("tags",keyword));
        //设置排序
        FieldSortBuilder readSize = SortBuilders.fieldSort("readSize").order(SortOrder.DESC);
        FieldSortBuilder commentSize = SortBuilders.fieldSort("commentSize").order(SortOrder.DESC);
        FieldSortBuilder voteSize = SortBuilders.fieldSort("voteSize").order(SortOrder.DESC);
        FieldSortBuilder createTime = SortBuilders.fieldSort("createTime").order(SortOrder.DESC);

        //查询
       SearchResponse searchResponse = this.client.prepareSearch("myblog")
                .setTypes("blog")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) //设置查询类型：1.SearchType.DFS_QUERY_THEN_FETCH 精确查询； 2.SearchType.SCAN 扫描查询,无序
                .setQuery(boolBuilder)
                .addSort(readSize)
                .addSort(commentSize)
                .addSort(voteSize)
                .addSort(createTime)
                .setFrom(pageable.getOffSet())
                .setSize(pageable.getSize())
                .get();
        //打印语句
        System.out.println(searchResponse.toString());
        //接受结果
        List result = new ArrayList();
        for(SearchHit hits:searchResponse.getHits()){
            //实例化对象
            EsBlogVO esBlogVo = new EsBlogVO();
            //获得查询数据
            Map source = hits.getSource();
            //转化时间
            String date = (java.lang.String) source.get("createTime");
            date = date.replace("Z", " UTC");//注意是空格+UTC
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS Z");//注意格式化的表达式
            Date d = format.parse(date );
            SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    
            String sdate=format2.format(d);        
            Timestamp fTimestamp=Timestamp.valueOf(sdate);   
            //将转化后的时间存放到map中
            source.put("createTime", fTimestamp);
            //将map转化为Bean
            BeanUtils.populate(esBlogVo, source);
            //将查询出来的结果放到集合当中
            result.add(esBlogVo);
        }
        pageable.setContentList(result);
        return pageable;
    }

    /**
     * 按最新查询
     * @param keyword
     * @param pageable
     * @return
     * @throws ParseException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public PageBean listNewestEsBlogs(String keyword,PageBean pageable) throws ParseException, IllegalAccessException, InvocationTargetException{
        //建立bool查询
        BoolQueryBuilder boolBuilder = QueryBuilders.boolQuery();
        //使用should实现或者查询
        boolBuilder.should(QueryBuilders.matchQuery("title",keyword));
        boolBuilder.should(QueryBuilders.matchQuery("summary",keyword));
        boolBuilder.should(QueryBuilders.matchQuery("content",keyword));
        boolBuilder.should(QueryBuilders.matchQuery("tags",keyword));
        //设置排序
        FieldSortBuilder createTime = SortBuilders.fieldSort("createTime").order(SortOrder.DESC);

        //查询
       SearchResponse searchResponse = this.client.prepareSearch("myblog")
                .setTypes("blog")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) //设置查询类型：1.SearchType.DFS_QUERY_THEN_FETCH 精确查询； 2.SearchType.SCAN 扫描查询,无序
                .setQuery(boolBuilder)
                .addSort(createTime)
                .setFrom(pageable.getOffSet())
                .setSize(pageable.getSize())
                .get();
        //打印语句
        System.out.println(searchResponse.toString());
        //接受结果
        List result = new ArrayList();
        for(SearchHit hits:searchResponse.getHits()){
            //实例化对象
            EsBlogVO esBlogVo = new EsBlogVO();
            //获得查询数据
            Map source = hits.getSource();
            //转化时间
            String date = (java.lang.String) source.get("createTime");
            date = date.replace("Z", " UTC");//注意是空格+UTC
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS Z");//注意格式化的表达式
            Date d = format.parse(date );
            SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    
            String sdate=format2.format(d);        
            Timestamp fTimestamp=Timestamp.valueOf(sdate);   
            //将转化后的时间存放到map中
            source.put("createTime", fTimestamp);
            //将map转化为Bean
            BeanUtils.populate(esBlogVo, source);
            //将查询出来的结果放到集合当中
            result.add(esBlogVo);
        }
        pageable.setContentList(result);
        return pageable;
    }

    /**
     * 查询document中最新的前5个
     * @param offset
     * @param pageSize
     * @return
     * @throws ParseException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public List listnewTop5EsBlog (int offset,int pageSize) throws ParseException, IllegalAccessException, InvocationTargetException{
        //全文检索
        MatchAllQueryBuilder matchAllQuery = QueryBuilders.matchAllQuery();
        //设置排序
        FieldSortBuilder createTime = SortBuilders.fieldSort("createTime").order(SortOrder.DESC);

        //查询
       SearchResponse searchResponse = this.client.prepareSearch("myblog")
                .setTypes("blog")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) //设置查询类型：1.SearchType.DFS_QUERY_THEN_FETCH 精确查询； 2.SearchType.SCAN 扫描查询,无序
                .setQuery(matchAllQuery)
                .addSort(createTime)
                .setFrom(offset)
                .setSize(pageSize)
                .get();
        //打印语句
        System.out.println(searchResponse.toString());
        //接受结果
        List result = new ArrayList();
        for(SearchHit hits:searchResponse.getHits()){
            //实例化对象
            EsBlogVO esBlogVo = new EsBlogVO();
            //获得查询数据
            Map source = hits.getSource();
            //转化时间
            String date = (java.lang.String) source.get("createTime");
            date = date.replace("Z", " UTC");//注意是空格+UTC
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS Z");//注意格式化的表达式
            Date d = format.parse(date );
            SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    
            String sdate=format2.format(d);        
            Timestamp fTimestamp=Timestamp.valueOf(sdate);   
            //将转化后的时间存放到map中
            source.put("createTime", fTimestamp);
            //将map转化为Bean
            BeanUtils.populate(esBlogVo, source);
            //将查询出来的结果放到集合当中
            result.add(esBlogVo);
        }
        return result;
    }
    /**
     * 查询document中最热5个
     * @param offset
     * @param pageSize
     * @return
     * @throws ParseException 
     * @throws InvocationTargetException 
     * @throws IllegalAccessException 
     */
    public List listHot5EsBlog (int offset,int pageSize) throws ParseException, IllegalAccessException, InvocationTargetException{
        //建立bool查询
        MatchAllQueryBuilder matchAllQuery = QueryBuilders.matchAllQuery();
        //设置排序
        FieldSortBuilder readSize = SortBuilders.fieldSort("readSize").order(SortOrder.DESC);
        FieldSortBuilder commentSize = SortBuilders.fieldSort("commentSize").order(SortOrder.DESC);
        FieldSortBuilder voteSize = SortBuilders.fieldSort("voteSize").order(SortOrder.DESC);
        FieldSortBuilder createTime = SortBuilders.fieldSort("createTime").order(SortOrder.DESC); 
        //查询
       SearchResponse searchResponse = this.client.prepareSearch("myblog")
                .setTypes("blog")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) //设置查询类型：1.SearchType.DFS_QUERY_THEN_FETCH 精确查询； 2.SearchType.SCAN 扫描查询,无序
                .setQuery(matchAllQuery)
                .addSort(readSize)
                .addSort(commentSize)
                .addSort(voteSize)
                .addSort(createTime)
                .setFrom(offset)
                .setSize(pageSize)
                .get();
        //打印语句
        System.out.println(searchResponse.toString());
        //接受结果
        List result = new ArrayList();
        for(SearchHit hits:searchResponse.getHits()){
            //实例化对象
            EsBlogVO esBlogVo = new EsBlogVO();
            //获得查询数据
            Map source = hits.getSource();
            //转化时间
            String date = (java.lang.String) source.get("createTime");
            date = date.replace("Z", " UTC");//注意是空格+UTC
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS Z");//注意格式化的表达式
            Date d = format.parse(date );
            SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    
            String sdate=format2.format(d);        
            Timestamp fTimestamp=Timestamp.valueOf(sdate);   
            //将转化后的时间存放到map中
            source.put("createTime", fTimestamp);
            //将map转化为Bean
            BeanUtils.populate(esBlogVo, source);
            //将查询出来的结果放到集合当中
            result.add(esBlogVo);
        }
        return result;
    }
    /**
     * 查询document总记录数
     * @return
     */
    public Integer findTotalElement() {
        //建立bool查询
         MatchAllQueryBuilder matchAllQuery = QueryBuilders.matchAllQuery();

        SearchRequestBuilder searchRequestBuilder = this.client.prepareSearch("myblog")
                .setTypes("blog")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) //设置查询类型：1.SearchType.DFS_QUERY_THEN_FETCH 精确查询； 2.SearchType.SCAN 扫描查询,无序
                .setQuery(matchAllQuery);
        //执行结果
        SearchResponse response = searchRequestBuilder.get();
        long totalHits = response.getHits().totalHits;
        return new Long(totalHits).intValue();
    }
    /**
     * esBlog的document的list分页查询,按时间进行排序
     * @param pageable
     * @return
     * @throws ParseException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public PageBean listEsBlogOrderByNew(PageBean pageable) throws ParseException, IllegalAccessException, InvocationTargetException {

        //建立bool查询
         MatchAllQueryBuilder matchAllQuery = QueryBuilders.matchAllQuery();
        //使用should实现或者查询
        //查询
       SearchResponse searchResponse = this.client.prepareSearch("myblog")
                .setTypes("blog")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) //设置查询类型：1.SearchType.DFS_QUERY_THEN_FETCH 精确查询； 2.SearchType.SCAN 扫描查询,无序
                .setQuery(matchAllQuery)
                .addSort("createTime", SortOrder.DESC)
                .setFrom(pageable.getOffSet())
                .setSize(pageable.getSize())
                .get();

        //接受结果
        List result = new ArrayList();
        for(SearchHit hits:searchResponse.getHits()){
            //实例化对象
            EsBlogVO esBlogVo = new EsBlogVO();
            //获得查询数据
            Map source = hits.getSource();
            //转化时间
            String date = (java.lang.String) source.get("createTime");
            date = date.replace("Z", " UTC");//注意是空格+UTC
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS Z");//注意格式化的表达式
            Date d = format.parse(date );
            SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    
            String sdate=format2.format(d);        
            Timestamp fTimestamp=Timestamp.valueOf(sdate);   
            //将转化后的时间存放到map中
            source.put("createTime", fTimestamp);
            //将map转化为Bean
            BeanUtils.populate(esBlogVo, source);
            //将查询出来的结果放到集合当中
            result.add(esBlogVo);
        }
        pageable.setContentList(result);
        return pageable;
    }
    /**
     * 查询博客document列表，按照热度进行排序
     * @param pageable
     * @return
     * @throws ParseException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public PageBean listEsBlogOrderByHot(PageBean pageable)
            throws ParseException, IllegalAccessException, InvocationTargetException {
        // 建立bool查询
        MatchAllQueryBuilder matchAllQuery = QueryBuilders.matchAllQuery();
        // 设置排序
        FieldSortBuilder readSize = SortBuilders.fieldSort("readSize").order(SortOrder.DESC);
        FieldSortBuilder commentSize = SortBuilders.fieldSort("commentSize").order(SortOrder.DESC);
        FieldSortBuilder voteSize = SortBuilders.fieldSort("voteSize").order(SortOrder.DESC);
        FieldSortBuilder createTime = SortBuilders.fieldSort("createTime").order(SortOrder.DESC);
        // 查询
        SearchResponse searchResponse = this.client.prepareSearch("myblog").setTypes("blog")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) // 设置查询类型：1.SearchType.DFS_QUERY_THEN_FETCH 精确查询.// 2.SearchType.SCAN 扫描查询,无序
                .setQuery(matchAllQuery)
                .addSort(readSize)
                .addSort(commentSize)
                .addSort(voteSize)
                .addSort(createTime)
                .setFrom(pageable.getOffSet())
                .setSize(pageable.getSize())
                .get();
        System.out.println(searchResponse.toString());
        // 接受结果
        List result = new ArrayList();
        for (SearchHit hits : searchResponse.getHits()) {
            // 实例化对象
            EsBlogVO esBlogVo = new EsBlogVO();
            // 获得查询数据
            Map source = hits.getSource();
            // 转化时间
            String date = (java.lang.String) source.get("createTime");
            date = date.replace("Z", " UTC");// 注意是空格+UTC
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS Z");// 注意格式化的表达式
            Date d = format.parse(date);
            SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String sdate = format2.format(d);
            Timestamp fTimestamp = Timestamp.valueOf(sdate);
            // 将转化后的时间存放到map中
            source.put("createTime", fTimestamp);
            // 将map转化为Bean
            BeanUtils.populate(esBlogVo, source);
            // 将查询出来的结果放到集合当中
            result.add(esBlogVo);
        }
        pageable.setContentList(result);
        return pageable;
    }
}

小结

上边ElasticSearch中的业务代码写的有点复杂，因为我是一个初学者，但是基本功能能够实现，如果上面有什么错误或者大家有什么建议，请大家留言，一起讨论一下。