1. 引入依賴
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
2. 配置Es
# ElasticsearchProperties
spring.data.elasticsearch.cluster-name=nowcoder
spring.data.elasticsearch.cluster-nodes=127.0.0.1:9300
解決es和redis的衝突:
@SpringBootApplication
public class CommunityApplication {
@PostConstruct
public void init() {
// 解決netty啓動衝突問題
// see Netty4Utils.setAvailableProcessors()
System.setProperty("es.set.netty.runtime.available.processors", "false");
}
public static void main(String[] args) {
SpringApplication.run(CommunityApplication.class, args);
}
}
3.Spring Data Es
1)ElasticsearchTemplate
2)ElasticsearchRespository
在實體類中上配置
@Document(indexName = "discusspost", type = "_doc", shards = 6, replicas = 3)
public class DiscussPost {
@Id
private int id;
@Field(type = FieldType.Integer)
private int userId;
// 互聯網校招
@Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
private String title;
@Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
private String content;
@Field(type = FieldType.Integer)
private int type;
@Field(type = FieldType.Integer)
private int status;
@Field(type = FieldType.Date)
private Date createTime;
@Field(type = FieldType.Integer)
private int commentCount;
@Field(type = FieldType.Double)
private double score;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public int getStatus() {
return status;
}
public void setStatus(int status) {
this.status = status;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public int getCommentCount() {
return commentCount;
}
public void setCommentCount(int commentCount) {
this.commentCount = commentCount;
}
public double getScore() {
return score;
}
public void setScore(double score) {
this.score = score;
}
@Override
public String toString() {
return "DiscussPost{" +
"id=" + id +
", userId=" + userId +
", title='" + title + '\'' +
", content='" + content + '\'' +
", type=" + type +
", status=" + status +
", createTime=" + createTime +
", commentCount=" + commentCount +
", score=" + score +
'}';
}
}
創建接口DiscussPostRepository訪問帖子:
@Repository
public interface DiscussPostRepository extends ElasticsearchRepository<DiscussPost, Integer> {
}
測試:
@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class ElasticsearchTests {
@Autowired
private DiscussPostMapper discussMapper;
@Autowired
private DiscussPostRepository discussRepository;
@Autowired
private ElasticsearchTemplate elasticTemplate;
@Test
public void testInsert() {
discussRepository.save(discussMapper.selectDiscussPostById(241));
discussRepository.save(discussMapper.selectDiscussPostById(242));
discussRepository.save(discussMapper.selectDiscussPostById(243));
}
@Test
public void testInsertList() {
discussRepository.saveAll(discussMapper.selectDiscussPosts(101, 0, 100));
discussRepository.saveAll(discussMapper.selectDiscussPosts(102, 0, 100));
discussRepository.saveAll(discussMapper.selectDiscussPosts(103, 0, 100));
discussRepository.saveAll(discussMapper.selectDiscussPosts(111, 0, 100));
discussRepository.saveAll(discussMapper.selectDiscussPosts(112, 0, 100));
discussRepository.saveAll(discussMapper.selectDiscussPosts(131, 0, 100));
discussRepository.saveAll(discussMapper.selectDiscussPosts(132, 0, 100));
discussRepository.saveAll(discussMapper.selectDiscussPosts(133, 0, 100));
discussRepository.saveAll(discussMapper.selectDiscussPosts(134, 0, 100));
}
@Test
public void testUpdate() {
DiscussPost post = discussMapper.selectDiscussPostById(231);
post.setContent("我是新人,使勁灌水.");
discussRepository.save(post);
}
@Test
public void testDelete() {
// discussRepository.deleteById(231);
discussRepository.deleteAll();
}
@Test
public void testSearchByRepository() {
SearchQuery searchQuery = new NativeSearchQueryBuilder()
.withQuery(QueryBuilders.multiMatchQuery("互聯網寒冬", "title", "content"))
.withSort(SortBuilders.fieldSort("type").order(SortOrder.DESC))
.withSort(SortBuilders.fieldSort("score").order(SortOrder.DESC))
.withSort(SortBuilders.fieldSort("createTime").order(SortOrder.DESC))
.withPageable(PageRequest.of(0, 10))
.withHighlightFields(
new HighlightBuilder.Field("title").preTags("<em>").postTags("</em>"),
new HighlightBuilder.Field("content").preTags("<em>").postTags("</em>")
).build();
// elasticTemplate.queryForPage(searchQuery, class, SearchResultMapper)
// 底層獲取得到了高亮顯示的值, 但是沒有返回.
Page<DiscussPost> page = discussRepository.search(searchQuery);
System.out.println(page.getTotalElements());
System.out.println(page.getTotalPages());
System.out.println(page.getNumber());
System.out.println(page.getSize());
for (DiscussPost post : page) {
System.out.println(post);
}
}
@Test
public void testSearchByTemplate() {
SearchQuery searchQuery = new NativeSearchQueryBuilder()
.withQuery(QueryBuilders.multiMatchQuery("互聯網寒冬", "title", "content"))
.withSort(SortBuilders.fieldSort("type").order(SortOrder.DESC))
.withSort(SortBuilders.fieldSort("score").order(SortOrder.DESC))
.withSort(SortBuilders.fieldSort("createTime").order(SortOrder.DESC))
.withPageable(PageRequest.of(0, 10))
.withHighlightFields(
new HighlightBuilder.Field("title").preTags("<em>").postTags("</em>"),
new HighlightBuilder.Field("content").preTags("<em>").postTags("</em>")
).build();
Page<DiscussPost> page = elasticTemplate.queryForPage(searchQuery, DiscussPost.class, new SearchResultMapper() {
@Override
public <T> AggregatedPage<T> mapResults(SearchResponse response, Class<T> aClass, Pageable pageable) {
SearchHits hits = response.getHits();
if (hits.getTotalHits() <= 0) {
return null;
}
List<DiscussPost> list = new ArrayList<>();
for (SearchHit hit : hits) {
DiscussPost post = new DiscussPost();
String id = hit.getSourceAsMap().get("id").toString();
post.setId(Integer.valueOf(id));
String userId = hit.getSourceAsMap().get("userId").toString();
post.setUserId(Integer.valueOf(userId));
String title = hit.getSourceAsMap().get("title").toString();
post.setTitle(title);
String content = hit.getSourceAsMap().get("content").toString();
post.setContent(content);
String status = hit.getSourceAsMap().get("status").toString();
post.setStatus(Integer.valueOf(status));
String createTime = hit.getSourceAsMap().get("createTime").toString();
post.setCreateTime(new Date(Long.valueOf(createTime)));
String commentCount = hit.getSourceAsMap().get("commentCount").toString();
post.setCommentCount(Integer.valueOf(commentCount));
// 處理高亮顯示的結果
HighlightField titleField = hit.getHighlightFields().get("title");
if (titleField != null) {
post.setTitle(titleField.getFragments()[0].toString());
}
HighlightField contentField = hit.getHighlightFields().get("content");
if (contentField != null) {
post.setContent(contentField.getFragments()[0].toString());
}
list.add(post);
}
return new AggregatedPageImpl(list, pageable,
hits.getTotalHits(), response.getAggregations(), response.getScrollId(), hits.getMaxScore());
}
});
System.out.println(page.getTotalElements());
System.out.println(page.getTotalPages());
System.out.println(page.getNumber());
System.out.println(page.getSize());
for (DiscussPost post : page) {
System.out.println(post);
}
}
}