参考：
https://www.elastic.co/guide/en/elasticsearch/client/java-rest/6.7/java-rest-low.html
www.elastic.co/guide/en/elasticsearch/client/java-rest/6.7/java-rest-high-search.html
1
3 import java.io.File;
4 import java.io.FileReader;
5 import java.io.IOException;
6 import java.util.HashMap;
7 import java.util.List;
8 import java.util.Map;
9 import java.util.Map.Entry;
10 import java.util.Properties;
11
12 import org.apache.http.HttpEntity;
13 import org.apache.http.HttpHost;
14 import org.apache.http.auth.AuthScope;
15 import org.apache.http.auth.UsernamePasswordCredentials;
16 import org.apache.http.client.CredentialsProvider;
17 import org.apache.http.entity.ContentType;
18 import org.apache.http.impl.client.BasicCredentialsProvider;
19 import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
20 import org.apache.http.nio.entity.NStringEntity;
21 import org.apache.http.util.EntityUtils;
22 import org.codehaus.jackson.JsonGenerationException;
23 import org.codehaus.jackson.map.JsonMappingException;
24 import org.codehaus.jackson.map.ObjectMapper;
25 import org.elasticsearch.action.search.SearchRequest;
26 import org.elasticsearch.action.search.SearchResponse;
27 import org.elasticsearch.client.RequestOptions;
28 import org.elasticsearch.client.Response;
29 import org.elasticsearch.client.RestClient;
30 import org.elasticsearch.client.RestClientBuilder;
31 import org.elasticsearch.client.RestHighLevelClient;
32 import org.elasticsearch.common.unit.TimeValue;
33 import org.elasticsearch.index.query.QueryBuilders;
34 import org.elasticsearch.rest.RestStatus;
35 import org.elasticsearch.search.SearchHit;
36 import org.elasticsearch.search.SearchHits;
37 import org.elasticsearch.search.builder.SearchSourceBuilder;
38 import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
39 import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
40 import org.junit.Test;
41
42 import com.alibaba.fastjson.JSONArray;
43 import com.alibaba.fastjson.JSONObject;
44
45 public class ElasticUtil {
46 static ObjectMapper mapper = new ObjectMapper();
47 static RestClient rc=null;
48
49 public static RestClient getInstance() throws IOException{
50 if(rc==null) {
51 return getElasticClient();
52 }else {
53 return rc;
54 }
55 }
56
57 /**
58 * RestHighLevelClient使用详情请参考
59 * <a href="https://www.elastic.co/guide/en/elasticsearch/client/java-rest/6.7/java-rest-high-search.html">官方文档</a><br>
60 * 使用样例见{@link #restHighLevelClient_Demo}
61 * @return
62 * @throws IOException
63 * @since jdk 1.8
64 */
65 public static RestHighLevelClient getRestHighLevelClient() throws IOException{
66 Properties pro=new Properties();
67 String filePath=System.getProperty("user.dir")+File.separator+"config/elasticsearch.properties";
68 try {
69 pro.load(new FileReader(filePath));
70 } catch (Exception e) {
71 e.printStackTrace();
72 }
73 String ip=pro.getProperty("ip");
74 String port=pro.getProperty("port");
75 RestHighLevelClient client = new RestHighLevelClient(
76 RestClient.builder(
77 new HttpHost(ip, Integer.valueOf(port), "http")));
78 return client;
79 }
80
81
82 /**
83 * LowLeveClient使用详情请参考
84 * <a href="https://www.elastic.co/guide/en/elasticsearch/client/java-rest/6.7/java-rest-high-search.html">官方文档</a><br>
85 * 使用样例见{@link #restLowLeveClient_Demo}
86 * @return
87 * @throws IOException
88 * @since jdk 1.7
89 */
90 public static RestClient getElasticClient() throws IOException{
91 Properties pro=new Properties();
92 String filePath=System.getProperty("user.dir")+File.separator+"config/elasticsearch.properties";
93 try {
94 pro.load(new FileReader(filePath));
95 } catch (Exception e) {
96 e.printStackTrace();
97 }
98 String ip=pro.getProperty("ip");
99 String port=pro.getProperty("port");
100 102 return getElasticClient(ip,Integer.valueOf(port),username,passwd);
103 }
104
105 public static void main(String[] args) throws IOException {
106 SearchResponse res=getELKSerach("index1","关键字",0,10,new String[] {"<em>","</em>"});
107 SearchHits hits = res.getHits();
108 for(SearchHit hit: hits){
109 // System.out.println(); //高亮部分
110 // System.out.println(hit.getScore()); //单个结果集评分
111 Map<String, Object> map=hit.getSourceAsMap();
112 // System.out.println(map); //json数据转为map<k,v>
113 for(Entry<String, HighlightField> ent:hit.getHighlightFields().entrySet()) {
114 String highl_key=ent.getValue().getName();
115 String highl_val=ent.getValue().getFragments()[0].toString();
116 map.put(highl_key, highl_val);
117 // System.out.println(ent.getKey()+"\t"+ent.getValue());
118 // System.out.println(ent.getValue().getName()+"\t"+ent.getValue().getFragments()[0]);
119 }
120 System.out.println(map);
121 }
122 }
123 142
143 /**
144 * @param index 查询的index(类似mysql的datadb)
145 * @param keyWord 查询的关键字
146 * @param from 分页参数1
147 * @param size 分页参数2
148 * @return
149 * @throws IOException
150 */
151 public static SearchResponse getELKSerach(String index,String keyWord,int from,int size) throws IOException {
152 RestHighLevelClient client= getRestHighLevelClient();
153 SearchRequest searchRequest = new SearchRequest(index);
154 SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
155 searchSourceBuilder.query(QueryBuilders.queryStringQuery(keyWord));
156 searchSourceBuilder.timeout(TimeValue.timeValueSeconds(5));
157 searchSourceBuilder.from(from);
158 searchSourceBuilder.size(size);
159 searchRequest.source(searchSourceBuilder);
160 SearchResponse searchResponse=client.search(searchRequest, RequestOptions.DEFAULT);
161 client.close();
162 return searchResponse;
163 }
164 /**
165 * @param index 查询的index(类似mysql的datadb)
166 * @param keyWord 查询的关键字
167 * @param from 分页参数1
168 * @param size 分页参数2
169 * @param Highlight 自定义css
170 * @return
171 * @throws IOException
172 */
173 public static SearchResponse getELKSerach(String index,String keyWord,int from,int size,String[] Highlight) throws IOException {
174 RestHighLevelClient client= getRestHighLevelClient();
175 SearchRequest searchRequest = new SearchRequest(index);
176 SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
177 //高亮
178 if(Highlight.length==2) {
179 HighlightBuilder highlightBuilder =new HighlightBuilder();
180 highlightBuilder.field("*");//require_field_match
181 highlightBuilder.requireFieldMatch(false);
182 highlightBuilder.preTags(Highlight[0]);
183 highlightBuilder.postTags(Highlight[1]);
184 searchSourceBuilder.highlighter(highlightBuilder);
185 }
186 //查询
187 searchSourceBuilder.query(QueryBuilders.queryStringQuery(keyWord));
188 searchSourceBuilder.timeout(TimeValue.timeValueSeconds(5));
189 searchSourceBuilder.from(from);
190 searchSourceBuilder.size(size);
191 searchRequest.source(searchSourceBuilder);
192 SearchResponse searchResponse=client.search(searchRequest, RequestOptions.DEFAULT);
193 client.close();
194 return searchResponse;
195 }
196
197 void restLowLeveClient_Demo() throws IOException {
198 RestClient rc =getInstance();
199 HashMap<String,String> params=new HashMap<>();
200 HttpEntity entity= getHttpEntityByKeyWord("关键字",0,10);
201 Response response =rc.performRequest("GET", "/index1/_search",params,entity);
202 System.out.println(response.getStatusLine().getStatusCode());
203
204 String responseBody = EntityUtils.toString(response.getEntity());
205 System.out.println(responseBody);
206 JSONObject result = JSONObject.parseObject(responseBody);
207 JSONObject hists=result.getJSONObject("hits");
208 System.out.println(hists);
209 JSONArray list=hists.getJSONArray("hits");
210 System.out.println(list);
211 int i= list.size();
212 System.out.println("all:"+i);
213 System.out.println(list.get(0));
214 rc.close();
215 }
216
217 void restHighLevelClient_Demo() throws IOException {
218 RestHighLevelClient client= getRestHighLevelClient();
219 SearchRequest searchRequest = new SearchRequest("index1");
220 SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
221 searchSourceBuilder.query(QueryBuilders.queryStringQuery("关键字"));
222 searchSourceBuilder.timeout(TimeValue.timeValueSeconds(5));
223 searchSourceBuilder.from(0);
224 searchSourceBuilder.size(10);
225 searchRequest.source(searchSourceBuilder);
226 SearchResponse searchResponse=client.search(searchRequest, RequestOptions.DEFAULT);
227 RestStatus status = searchResponse.status();
228 System.out.println(status);
229 SearchHits hits = searchResponse.getHits();
230 for(SearchHit hit: hits){
231 System.out.println(hit.getScore());
232 System.out.println(hit.getSourceAsMap());
233 }
234 client.close();
235 }
236
237 /*
238 * 有分页
239 */
240 static HttpEntity getHttpEntityByKeyWord(String keyWord,int from,int size) throws IOException{
241 String queryString=
242 "{\r\n" +
243 " \"from\" : "+from+", \"size\" : "+size+","+
244 " \"query\": {\r\n" +
245 " \"multi_match\" : {\r\n" +
246 " \"query\": \""+keyWord+"\"\r\n" +
247 " }\r\n" +
248 " }\r\n" +
249 "}";
250 return new NStringEntity(queryString, ContentType.APPLICATION_JSON);
251 }
252
253 static HttpEntity getHttpEntityByKeyWord(String keyWord) throws IOException{
254 String queryString=
255 "{\r\n" +
256 " \"query\": {\r\n" +
257 " \"multi_match\" : {\r\n" +
258 " \"query\": \""+keyWord+"\"\r\n" +
259 " }\r\n" +
260 " }\r\n" +
261 "}";
262 return new NStringEntity(queryString, ContentType.APPLICATION_JSON);
263 }
264 /**
265 * 获取elastic的client的信息
266 * @param ip
267 * @param port
268 * @param usename
269 * @param passwd
270 * @return
271 */
272 public static RestClient getElasticClient(String ip, Integer port, String usename, String passwd) {
273 final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
274 credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(usename, passwd));
275 RestClient restClient = RestClient.builder(new HttpHost(ip, port, "http"))
276 .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
277 public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
278 httpClientBuilder.disableAuthCaching();
279 return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
280 }
281 }).build();
282 return restClient;
283 }
284
285 public static HttpEntity entiy2HttpEntity(Object ent) throws JsonGenerationException, JsonMappingException, IOException{
286 String jsonString = mapper.writeValueAsString(ent);
287 HttpEntity entity = new NStringEntity(jsonString, ContentType.APPLICATION_JSON);
288 return entity;
289 }
290
291 /**
292 * 批处理用
293 * @param list
294 * @return
295 * @throws JsonGenerationException
296 * @throws JsonMappingException
297 * @throws IOException
298 */
299 public static HttpEntity entiyList2HttpEntity(List<Object> list,String index,String type) throws JsonGenerationException, JsonMappingException, IOException{
300 String tmp="{ \"index\": { \"_index\": \""+index+"\", \"_type\": \""+type+"\" }}";
301 StringBuilder sb=new StringBuilder();
302 for (Object ent : list) {
303 String jsonString = mapper.writeValueAsString(ent);
304 sb.append(tmp).append("\n").append(jsonString).append("\n");
305 }
306
307 HttpEntity entity = new NStringEntity(sb.toString(), ContentType.APPLICATION_JSON);
308 return entity;
309 }
310
311 public static String Response2String( Response response) throws IOException{
312 return EntityUtils.toString(response.getEntity());
313 }
314
315 }
来源：oschina
链接：https://my.oschina.net/u/4313186/blog/3534276