Java连接简单使用ElasticSearch
1. 添加依赖
<!-- https://mvnrepository.com/artifact/org.elasticsearch.client/elasticsearch-rest-client -->
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-client</artifactId>
<version>8.2.2</version>
</dependency>
<!--引入json进行HTTP序列化-->
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20160810</version>
</dependency>
2. 代码，无账号密码
package com.xiaostudy.mycode;
import com.xiaostudy.mycode.entity.ESUser;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.util.EntityUtils;
import org.elasticsearch.client.Request;
import org.elasticsearch.client.Response;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.IOException;
import java.lang.reflect.Field;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/**
* @author liwei
* @version 1.0
* @className TestJDBC
* @date 2022/5/31 11:05
* @description 测试solr
*/
public class TestES {
public static void main(String[] args) throws KeyStoreException, NoSuchAlgorithmException, KeyManagementException, IOException {
RestClient client = getClient();
// createIndices(client, "user");
// boolean type = createType(client, "user", ESUser.class);
// System.out.println("=============================================");
// System.out.println("添加类的所有类型：" + type);
// System.out.println("=============================================");
// ESUser user = new ESUser();
// user.setId("1");
// user.setName("11");
// user.setAge(1L);
// String add = addByPost(client, "user", user);
// System.out.println("=============================================");
// System.out.println("添加返回：" + add);
// System.out.println("=============================================");
// ESUser user2 = new ESUser();
// user2.setId("3");
// user2.setName("张三");
// user2.setAge(33L);
// String add2 = addByPut(client, "user", user2);
// System.out.println("=============================================");
// System.out.println("添加返回：" + add2);
// System.out.println("=============================================");
// getByIndicesAll(client, "user");
// getByIndicesId(client, "user", "2");
// getByIndicesType(client, "user", "id", "2");
// getByIndicesType(client, "user", "name", "11");
client.close();
}
/**
* 获取索引下所有数据
*
* @param client
* @param indices
* @return java.util.List<com.xiaostudy.mycode.entity.ESUser>
* @author liwei
* @date 2022/6/6 11:00
*/
public static List<ESUser> getByIndicesId(RestClient client, String indices, String id) {
try {
Request request = new Request("GET", String.format("/%s/_search", indices));
JSONObject jsonObject2 = new JSONObject();
JSONObject jsonObject3 = new JSONObject();
JSONObject jsonObject4 = new JSONObject();
jsonObject4.put("default_field", "id");
jsonObject4.put("query", id);
jsonObject3.put("query_string", jsonObject4);
jsonObject2.put("query", jsonObject3);
request.setJsonEntity(jsonObject2.toString());
// 发送HTTP请求
Response response = client.performRequest(request);
HttpEntity entity = response.getEntity();
String s = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(s);
JSONObject hits = jsonObject.getJSONObject("hits");
JSONArray jsonArray = hits.getJSONArray("hits");
List<Object> list = jsonArray.toList();
List<ESUser> userList = new ArrayList<>();
for (Object o : list) {
JSONObject jsonObject1 = null;
HashMap<String, Object> hashMap = null;
if (o instanceof JSONObject) {
jsonObject1 = ((JSONObject) o).getJSONObject("_source");
} else if (o instanceof HashMap) {
Object source = ((HashMap) o).get("_source");
if (source instanceof JSONObject) {
jsonObject1 = (JSONObject) source;
} else if (source instanceof HashMap) {
hashMap = (HashMap) source;
}
}
if (null == jsonObject1 && null == hashMap) {
System.out.println("这行取数据有问题");
continue;
}
ESUser user = new ESUser();
Object age;
if (null == jsonObject1) {
user.setId((String) hashMap.get("id"));
user.setName((String) hashMap.get("name"));
age = hashMap.get("age");
} else {
user.setId((String) jsonObject1.get("id"));
user.setName((String) jsonObject1.get("name"));
age = jsonObject1.get("age");
}
Long ageLong = null;
if (age instanceof Long) {
ageLong = (Long) age;
} else if (age instanceof Integer) {
ageLong = ((Integer) age).longValue();
}
user.setAge(ageLong);
userList.add(user);
}
System.out.println("=============================================");
System.out.println(userList);
System.out.println("=============================================");
return userList;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 获取索引下所有数据
*
* @param client
* @param indices
* @return java.util.List<com.xiaostudy.mycode.entity.ESUser>
* @author liwei
* @date 2022/6/6 11:00
*/
public static List<ESUser> getByIndicesType(RestClient client, String indices, String type, String typeValue) {
try {
Request request = new Request("GET", String.format("/%s/_search", indices));
JSONObject jsonObject2 = new JSONObject();
JSONObject jsonObject3 = new JSONObject();
JSONObject jsonObject4 = new JSONObject();
jsonObject4.put("default_field", type);
jsonObject4.put("query", typeValue);
jsonObject3.put("query_string", jsonObject4);
jsonObject2.put("query", jsonObject3);
request.setJsonEntity(jsonObject2.toString());
// 发送HTTP请求
Response response = client.performRequest(request);
HttpEntity entity = response.getEntity();
String s = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(s);
JSONObject hits = jsonObject.getJSONObject("hits");
JSONArray jsonArray = hits.getJSONArray("hits");
List<Object> list = jsonArray.toList();
List<ESUser> userList = new ArrayList<>();
for (Object o : list) {
JSONObject jsonObject1 = null;
HashMap<String, Object> hashMap = null;
if (o instanceof JSONObject) {
jsonObject1 = ((JSONObject) o).getJSONObject("_source");
} else if (o instanceof HashMap) {
Object source = ((HashMap) o).get("_source");
if (source instanceof JSONObject) {
jsonObject1 = (JSONObject) source;
} else if (source instanceof HashMap) {
hashMap = (HashMap) source;
}
}
if (null == jsonObject1 && null == hashMap) {
System.out.println("这行取数据有问题");
continue;
}
ESUser user = new ESUser();
Object age;
if (null == jsonObject1) {
user.setId((String) hashMap.get("id"));
user.setName((String) hashMap.get("name"));
age = hashMap.get("age");
} else {
user.setId((String) jsonObject1.get("id"));
user.setName((String) jsonObject1.get("name"));
age = jsonObject1.get("age");
}
Long ageLong = null;
if (age instanceof Long) {
ageLong = (Long) age;
} else if (age instanceof Integer) {
ageLong = ((Integer) age).longValue();
}
user.setAge(ageLong);
userList.add(user);
}
System.out.println("=============================================");
System.out.println(userList);
System.out.println("=============================================");
return userList;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 获取索引下所有数据
*
* @param client
* @param indices
* @return java.util.List<com.xiaostudy.mycode.entity.ESUser>
* @author liwei
* @date 2022/6/6 11:00
*/
public static List<ESUser> getByIndicesAll(RestClient client, String indices) {
try {
// endpoint直接指定为index/type的形式
Request request = new Request("GET", String.format("/%s/_search", indices));
// 发送HTTP请求
Response response = client.performRequest(request);
System.out.println("=============================================");
// System.out.println(response);
HttpEntity entity = response.getEntity();
String s = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(s);
JSONObject hits = jsonObject.getJSONObject("hits");
JSONArray jsonArray = hits.getJSONArray("hits");
List<Object> list = jsonArray.toList();
List<ESUser> userList = new ArrayList<>();
for (Object o : list) {
JSONObject jsonObject1 = null;
HashMap<String, Object> hashMap = null;
if (o instanceof JSONObject) {
jsonObject1 = ((JSONObject) o).getJSONObject("_source");
} else if (o instanceof HashMap) {
Object source = ((HashMap) o).get("_source");
if (source instanceof JSONObject) {
jsonObject1 = (JSONObject) source;
} else if (source instanceof HashMap) {
hashMap = (HashMap) source;
}
}
if (null == jsonObject1 && null == hashMap) {
System.out.println("这行取数据有问题");
continue;
}
ESUser user = new ESUser();
Object age;
if (null == jsonObject1) {
user.setId((String) hashMap.get("id"));
user.setName((String) hashMap.get("name"));
age = hashMap.get("age");
} else {
user.setId((String) jsonObject1.get("id"));
user.setName((String) jsonObject1.get("name"));
age = jsonObject1.get("age");
}
Long ageLong = null;
if (age instanceof Long) {
ageLong = (Long) age;
} else if (age instanceof Integer) {
ageLong = ((Integer) age).longValue();
}
user.setAge(ageLong);
userList.add(user);
}
System.out.println(userList);
System.out.println("=============================================");
return userList;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 添加，id就是实体里面的id
*
* @param client
* @param indices
* @param user
* @return java.lang.String
* @author liwei
* @date 2022/6/2 23:18
*/
public static String addByPut(RestClient client, String indices, ESUser user) {
try {
// endpoint直接指定为index/type的形式
Request request = new Request("PUT", String.format("/%s/_doc/%s", indices, user.getId()));
JSONObject jsonObject = new JSONObject(user);
// 设置请求体并指定ContentType，如果不指定默认为APPLICATION_JSON
request.setJsonEntity(jsonObject.toString());
// 发送HTTP请求
Response response = client.performRequest(request);
// 获取响应体, id: AWXvzZYWXWr3RnGSLyhH
return EntityUtils.toString(response.getEntity());
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 添加，id随机生成
*
* @param client
* @param indices
* @param user
* @return java.lang.String
* @author liwei
* @date 2022/6/2 23:18
*/
public static String addByPost(RestClient client, String indices, ESUser user) {
try {
// endpoint直接指定为index/type的形式
Request request = new Request("POST", String.format("/%s/_doc", indices));
JSONObject jsonObject = new JSONObject(user);
// 设置请求体并指定ContentType，如果不指定默认为APPLICATION_JSON
request.setJsonEntity(jsonObject.toString());
// 发送HTTP请求
Response response = client.performRequest(request);
// 获取响应体, id: AWXvzZYWXWr3RnGSLyhH
return EntityUtils.toString(response.getEntity());
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 创建类型，创建类的所有类型，已有的类型就不再创建
*
* @param client
* @param indices
* @param clazz
* @return boolean
* @author liwei
* @date 2022/6/2 23:19
*/
public static boolean createType(RestClient client, String indices, Class clazz) {
try {
Request request = new Request("PUT", String.format("%s/_mapping", indices));
Field[] declaredFields = clazz.getDeclaredFields();
JSONObject jsonObject1 = new JSONObject();
JSONObject jsonObject2 = new JSONObject();
for (Field field : declaredFields) {
Class<?> type = field.getType();
String typeValue;
if (type == String.class) {
typeValue = "text";
} else if (type == Integer.class) {
typeValue = "integer";
} else if (type == Long.class) {
typeValue = "long";
} else if (type == Short.class) {
typeValue = "short";
} else if (type == Byte.class) {
typeValue = "byte";
} else if (type == Double.class) {
typeValue = "double";
} else if (type == Float.class) {
typeValue = "float";
} else if (type == Boolean.class) {
typeValue = "boolean";
} else {
typeValue = "text";
}
String fieldName = field.getName();
String s = getType(client, indices, fieldName);
if (null != s) {
continue;
}
JSONObject jsonObject3 = new JSONObject();
jsonObject3.put("type", typeValue);
jsonObject2.put(fieldName, jsonObject3);
}
if (jsonObject2.keySet().isEmpty()) {
return false;
}
jsonObject1.put("properties", jsonObject2);
// 设置请求体并指定ContentType，如果不指定默认为APPLICATION_JSON
request.setJsonEntity(jsonObject1.toString());
Response response = client.performRequest(request);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 创建类型，指定类型
*
* @param client
* @param indices
* @param type
* @param typeValue
* @return java.lang.String
* @author liwei
* @date 2022/6/2 23:19
*/
public static String createType(RestClient client, String indices, String type, String typeValue) {
String s = getType(client, indices, type);
if (null != s) {
return null;
}
try {
Request request = new Request("PUT", String.format("%s/_mapping", indices));
JSONObject jsonObject1 = new JSONObject();
JSONObject jsonObject2 = new JSONObject();
JSONObject jsonObject3 = new JSONObject();
jsonObject3.put("type", typeValue);
jsonObject2.put(type, jsonObject3);
jsonObject1.put("properties", jsonObject2);
// 设置请求体并指定ContentType，如果不指定默认为APPLICATION_JSON
request.setJsonEntity(jsonObject1.toString());
Response response = client.performRequest(request);
return EntityUtils.toString(response.getEntity());
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 查询索引是否有该类型
*
* @param client
* @param indices
* @param type
* @return java.lang.String
* @author liwei
* @date 2022/6/2 23:18
*/
public static String getType(RestClient client, String indices, String type) {
try {
Request request = new Request("GET", String.format("%s/_mapping", indices));
Response response = client.performRequest(request);
String responseBody = EntityUtils.toString(response.getEntity());
if (null == responseBody) {
return null;
}
JSONObject jsonObject = new JSONObject(responseBody);
JSONObject jsonObject1 = jsonObject.getJSONObject(indices);
if (null == jsonObject1) {
return null;
}
JSONObject mappings = jsonObject1.getJSONObject("mappings");
System.out.println("=============================================");
System.out.println(mappings);
System.out.println("=============================================");
if (null == mappings) {
return null;
}
JSONObject properties = mappings.getJSONObject("properties");
if (null == properties) {
return null;
}
return properties.has(type) ? type : null;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 创建索引，不存在则创建
*
* @param client
* @param indices
* @return java.lang.String
* @author liwei
* @date 2022/6/2 20:24
*/
public static String createIndices(RestClient client, String indices) {
String index = getIndices(client, indices);
if (null != index) {
return null;
}
try {
// 构造HTTP请求，第一个参数是请求方法，第二个参数是服务器的端点，host默认是http://localhost:9200，
// endpoint直接指定为index/type的形式
Request request = new Request("PUT", indices);
// 发送HTTP请求
Response response = client.performRequest(request);
// 获取响应体, id: AWXvzZYWXWr3RnGSLyhH
return EntityUtils.toString(response.getEntity());
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 查询索引是否存在，存在返回，不存在返回null
*
* @param client
* @param indices
* @return java.lang.String
* @author liwei
* @date 2022/6/2 20:24
*/
public static String getIndices(RestClient client, String indices) {
try {
Request request = new Request("GET", indices);
Response response = client.performRequest(request);
String responseBody = EntityUtils.toString(response.getEntity());
System.out.println("=============================================");
System.out.println(responseBody);
System.out.println("=============================================");
return responseBody;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 获取客户端
*
* @return org.elasticsearch.client.RestClient
* @author liwei
* @date 2022/6/2 23:18
*/
public static RestClient getClient() throws KeyStoreException, NoSuchAlgorithmException, KeyManagementException {
// 如果有多个从节点可以持续在内部new多个HttpHost，参数1是ip,参数2是HTTP端口，参数3是通信协议
RestClientBuilder clientBuilder = RestClient.builder(new HttpHost("localhost", 9200, "http"));
// 最后配置好的clientBuilder再build一下即可得到真正的Client
return clientBuilder.build();
}
}
3. 代码，有账号密码，并且是https方式
package com.xiaostudy.mycode;
import com.xiaostudy.mycode.entity.ESUser;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.http.message.BasicHeader;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;
import org.elasticsearch.client.Request;
import org.elasticsearch.client.Response;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.json.JSONArray;
import org.json.JSONObject;
import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/**
* @author liwei
* @version 1.0
* @className TestJDBC
* @date 2022/5/31 11:05
* @description 测试solr
*/
public class TestES {
public static void main(String[] args) throws KeyStoreException, NoSuchAlgorithmException, KeyManagementException, IOException, CertificateException {
RestClient client = getClient();
// createIndices(client, "user");
// boolean type = createType(client, "user", ESUser.class);
// System.out.println("=============================================");
// System.out.println("添加类的所有类型：" + type);
// System.out.println("=============================================");
// ESUser user = new ESUser();
// user.setId("1");
// user.setName("11");
// user.setAge(1L);
// String add = addByPost(client, "user", user);
// System.out.println("=============================================");
// System.out.println("添加返回：" + add);
// System.out.println("=============================================");
// ESUser user2 = new ESUser();
// user2.setId("3");
// user2.setName("张三");
// user2.setAge(33L);
// String add2 = addByPut(client, "user", user2);
// System.out.println("=============================================");
// System.out.println("添加返回：" + add2);
// System.out.println("=============================================");
// getByIndicesAll(client, "user");
// getByIndicesId(client, "user", "2");
// getByIndicesType(client, "user", "id", "2");
getByIndicesType(client, "user", "name", "11");
client.close();
}
/**
* 获取索引下所有数据
*
* @param client
* @param indices
* @return java.util.List<com.xiaostudy.mycode.entity.ESUser>
* @author liwei
* @date 2022/6/6 11:00
*/
public static List<ESUser> getByIndicesId(RestClient client, String indices, String id) {
try {
Request request = new Request("GET", String.format("/%s/_search", indices));
JSONObject jsonObject2 = new JSONObject();
JSONObject jsonObject3 = new JSONObject();
JSONObject jsonObject4 = new JSONObject();
jsonObject4.put("default_field", "id");
jsonObject4.put("query", id);
jsonObject3.put("query_string", jsonObject4);
jsonObject2.put("query", jsonObject3);
request.setJsonEntity(jsonObject2.toString());
// 发送HTTP请求
Response response = client.performRequest(request);
HttpEntity entity = response.getEntity();
String s = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(s);
JSONObject hits = jsonObject.getJSONObject("hits");
JSONArray jsonArray = hits.getJSONArray("hits");
List<Object> list = jsonArray.toList();
List<ESUser> userList = new ArrayList<>();
for (Object o : list) {
JSONObject jsonObject1 = null;
HashMap<String, Object> hashMap = null;
if (o instanceof JSONObject) {
jsonObject1 = ((JSONObject) o).getJSONObject("_source");
} else if (o instanceof HashMap) {
Object source = ((HashMap) o).get("_source");
if (source instanceof JSONObject) {
jsonObject1 = (JSONObject) source;
} else if (source instanceof HashMap) {
hashMap = (HashMap) source;
}
}
if (null == jsonObject1 && null == hashMap) {
System.out.println("这行取数据有问题");
continue;
}
ESUser user = new ESUser();
Object age;
if (null == jsonObject1) {
user.setId((String) hashMap.get("id"));
user.setName((String) hashMap.get("name"));
age = hashMap.get("age");
} else {
user.setId((String) jsonObject1.get("id"));
user.setName((String) jsonObject1.get("name"));
age = jsonObject1.get("age");
}
Long ageLong = null;
if (age instanceof Long) {
ageLong = (Long) age;
} else if (age instanceof Integer) {
ageLong = ((Integer) age).longValue();
}
user.setAge(ageLong);
userList.add(user);
}
System.out.println("=============================================");
System.out.println(userList);
System.out.println("=============================================");
return userList;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 获取索引下所有数据
*
* @param client
* @param indices
* @return java.util.List<com.xiaostudy.mycode.entity.ESUser>
* @author liwei
* @date 2022/6/6 11:00
*/
public static List<ESUser> getByIndicesType(RestClient client, String indices, String type, String typeValue) {
try {
Request request = new Request("GET", String.format("/%s/_search", indices));
JSONObject jsonObject2 = new JSONObject();
JSONObject jsonObject3 = new JSONObject();
JSONObject jsonObject4 = new JSONObject();
jsonObject4.put("default_field", type);
jsonObject4.put("query", typeValue);
jsonObject3.put("query_string", jsonObject4);
jsonObject2.put("query", jsonObject3);
request.setJsonEntity(jsonObject2.toString());
// 发送HTTP请求
Response response = client.performRequest(request);
HttpEntity entity = response.getEntity();
String s = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(s);
JSONObject hits = jsonObject.getJSONObject("hits");
JSONArray jsonArray = hits.getJSONArray("hits");
List<Object> list = jsonArray.toList();
List<ESUser> userList = new ArrayList<>();
for (Object o : list) {
JSONObject jsonObject1 = null;
HashMap<String, Object> hashMap = null;
if (o instanceof JSONObject) {
jsonObject1 = ((JSONObject) o).getJSONObject("_source");
} else if (o instanceof HashMap) {
Object source = ((HashMap) o).get("_source");
if (source instanceof JSONObject) {
jsonObject1 = (JSONObject) source;
} else if (source instanceof HashMap) {
hashMap = (HashMap) source;
}
}
if (null == jsonObject1 && null == hashMap) {
System.out.println("这行取数据有问题");
continue;
}
ESUser user = new ESUser();
Object age;
if (null == jsonObject1) {
user.setId((String) hashMap.get("id"));
user.setName((String) hashMap.get("name"));
age = hashMap.get("age");
} else {
user.setId((String) jsonObject1.get("id"));
user.setName((String) jsonObject1.get("name"));
age = jsonObject1.get("age");
}
Long ageLong = null;
if (age instanceof Long) {
ageLong = (Long) age;
} else if (age instanceof Integer) {
ageLong = ((Integer) age).longValue();
}
user.setAge(ageLong);
userList.add(user);
}
System.out.println("=============================================");
System.out.println(userList);
System.out.println("=============================================");
return userList;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 获取索引下所有数据
*
* @param client
* @param indices
* @return java.util.List<com.xiaostudy.mycode.entity.ESUser>
* @author liwei
* @date 2022/6/6 11:00
*/
public static List<ESUser> getByIndicesAll(RestClient client, String indices) {
try {
// endpoint直接指定为index/type的形式
Request request = new Request("GET", String.format("/%s/_search", indices));
// 发送HTTP请求
Response response = client.performRequest(request);
System.out.println("=============================================");
// System.out.println(response);
HttpEntity entity = response.getEntity();
String s = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(s);
JSONObject hits = jsonObject.getJSONObject("hits");
JSONArray jsonArray = hits.getJSONArray("hits");
List<Object> list = jsonArray.toList();
List<ESUser> userList = new ArrayList<>();
for (Object o : list) {
JSONObject jsonObject1 = null;
HashMap<String, Object> hashMap = null;
if (o instanceof JSONObject) {
jsonObject1 = ((JSONObject) o).getJSONObject("_source");
} else if (o instanceof HashMap) {
Object source = ((HashMap) o).get("_source");
if (source instanceof JSONObject) {
jsonObject1 = (JSONObject) source;
} else if (source instanceof HashMap) {
hashMap = (HashMap) source;
}
}
if (null == jsonObject1 && null == hashMap) {
System.out.println("这行取数据有问题");
continue;
}
ESUser user = new ESUser();
Object age;
if (null == jsonObject1) {
user.setId((String) hashMap.get("id"));
user.setName((String) hashMap.get("name"));
age = hashMap.get("age");
} else {
user.setId((String) jsonObject1.get("id"));
user.setName((String) jsonObject1.get("name"));
age = jsonObject1.get("age");
}
Long ageLong = null;
if (age instanceof Long) {
ageLong = (Long) age;
} else if (age instanceof Integer) {
ageLong = ((Integer) age).longValue();
}
user.setAge(ageLong);
userList.add(user);
}
System.out.println(userList);
System.out.println("=============================================");
return userList;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 添加，id就是实体里面的id
*
* @param client
* @param indices
* @param user
* @return java.lang.String
* @author liwei
* @date 2022/6/2 23:18
*/
public static String addByPut(RestClient client, String indices, ESUser user) {
try {
// endpoint直接指定为index/type的形式
Request request = new Request("PUT", String.format("/%s/_doc/%s", indices, user.getId()));
JSONObject jsonObject = new JSONObject(user);
// 设置请求体并指定ContentType，如果不指定默认为APPLICATION_JSON
request.setJsonEntity(jsonObject.toString());
// 发送HTTP请求
Response response = client.performRequest(request);
// 获取响应体, id: AWXvzZYWXWr3RnGSLyhH
return EntityUtils.toString(response.getEntity());
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 添加，id随机生成
*
* @param client
* @param indices
* @param user
* @return java.lang.String
* @author liwei
* @date 2022/6/2 23:18
*/
public static String addByPost(RestClient client, String indices, ESUser user) {
try {
// endpoint直接指定为index/type的形式
Request request = new Request("POST", String.format("/%s/_doc", indices));
JSONObject jsonObject = new JSONObject(user);
// 设置请求体并指定ContentType，如果不指定默认为APPLICATION_JSON
request.setJsonEntity(jsonObject.toString());
// 发送HTTP请求
Response response = client.performRequest(request);
// 获取响应体, id: AWXvzZYWXWr3RnGSLyhH
return EntityUtils.toString(response.getEntity());
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 创建类型，创建类的所有类型，已有的类型就不再创建
*
* @param client
* @param indices
* @param clazz
* @return boolean
* @author liwei
* @date 2022/6/2 23:19
*/
public static boolean createType(RestClient client, String indices, Class clazz) {
try {
Request request = new Request("PUT", String.format("%s/_mapping", indices));
Field[] declaredFields = clazz.getDeclaredFields();
JSONObject jsonObject1 = new JSONObject();
JSONObject jsonObject2 = new JSONObject();
for (Field field : declaredFields) {
Class<?> type = field.getType();
String typeValue;
if (type == String.class) {
typeValue = "text";
} else if (type == Integer.class) {
typeValue = "integer";
} else if (type == Long.class) {
typeValue = "long";
} else if (type == Short.class) {
typeValue = "short";
} else if (type == Byte.class) {
typeValue = "byte";
} else if (type == Double.class) {
typeValue = "double";
} else if (type == Float.class) {
typeValue = "float";
} else if (type == Boolean.class) {
typeValue = "boolean";
} else {
typeValue = "text";
}
String fieldName = field.getName();
String s = getType(client, indices, fieldName);
if (null != s) {
continue;
}
JSONObject jsonObject3 = new JSONObject();
jsonObject3.put("type", typeValue);
jsonObject2.put(fieldName, jsonObject3);
}
if (jsonObject2.keySet().isEmpty()) {
return false;
}
jsonObject1.put("properties", jsonObject2);
// 设置请求体并指定ContentType，如果不指定默认为APPLICATION_JSON
request.setJsonEntity(jsonObject1.toString());
Response response = client.performRequest(request);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 创建类型，指定类型
*
* @param client
* @param indices
* @param type
* @param typeValue
* @return java.lang.String
* @author liwei
* @date 2022/6/2 23:19
*/
public static String createType(RestClient client, String indices, String type, String typeValue) {
String s = getType(client, indices, type);
if (null != s) {
return null;
}
try {
Request request = new Request("PUT", String.format("%s/_mapping", indices));
JSONObject jsonObject1 = new JSONObject();
JSONObject jsonObject2 = new JSONObject();
JSONObject jsonObject3 = new JSONObject();
jsonObject3.put("type", typeValue);
jsonObject2.put(type, jsonObject3);
jsonObject1.put("properties", jsonObject2);
// 设置请求体并指定ContentType，如果不指定默认为APPLICATION_JSON
request.setJsonEntity(jsonObject1.toString());
Response response = client.performRequest(request);
return EntityUtils.toString(response.getEntity());
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 查询索引是否有该类型
*
* @param client
* @param indices
* @param type
* @return java.lang.String
* @author liwei
* @date 2022/6/2 23:18
*/
public static String getType(RestClient client, String indices, String type) {
try {
Request request = new Request("GET", String.format("%s/_mapping", indices));
Response response = client.performRequest(request);
String responseBody = EntityUtils.toString(response.getEntity());
if (null == responseBody) {
return null;
}
JSONObject jsonObject = new JSONObject(responseBody);
JSONObject jsonObject1 = jsonObject.getJSONObject(indices);
if (null == jsonObject1) {
return null;
}
JSONObject mappings = jsonObject1.getJSONObject("mappings");
System.out.println("=============================================");
System.out.println(mappings);
System.out.println("=============================================");
if (null == mappings) {
return null;
}
JSONObject properties = mappings.getJSONObject("properties");
if (null == properties) {
return null;
}
return properties.has(type) ? type : null;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 创建索引，不存在则创建
*
* @param client
* @param indices
* @return java.lang.String
* @author liwei
* @date 2022/6/2 20:24
*/
public static String createIndices(RestClient client, String indices) {
String index = getIndices(client, indices);
if (null != index) {
return null;
}
try {
// 构造HTTP请求，第一个参数是请求方法，第二个参数是服务器的端点，host默认是http://localhost:9200，
// endpoint直接指定为index/type的形式
Request request = new Request("PUT", indices);
// 发送HTTP请求
Response response = client.performRequest(request);
// 获取响应体, id: AWXvzZYWXWr3RnGSLyhH
return EntityUtils.toString(response.getEntity());
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 查询索引是否存在，存在返回，不存在返回null
*
* @param client
* @param indices
* @return java.lang.String
* @author liwei
* @date 2022/6/2 20:24
*/
public static String getIndices(RestClient client, String indices) {
try {
Request request = new Request("GET", indices);
Response response = client.performRequest(request);
String responseBody = EntityUtils.toString(response.getEntity());
System.out.println("=============================================");
System.out.println(responseBody);
System.out.println("=============================================");
return responseBody;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 获取客户端
*
* @return org.elasticsearch.client.RestClient
* @author liwei
* @date 2022/6/2 23:18
*/
public static RestClient getClient() throws KeyStoreException, NoSuchAlgorithmException, KeyManagementException, CertificateException, IOException {
// 如果有多个从节点可以持续在内部new多个HttpHost，参数1是ip,参数2是HTTP端口，参数3是通信协议
// RestClientBuilder clientBuilder = RestClient.builder(new HttpHost("localhost", 9200, "http"));
RestClientBuilder clientBuilder = RestClient.builder(new HttpHost("localhost", 9200, "https"));
final CredentialsProvider credentialsProvider =
new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY,
new UsernamePasswordCredentials("elastic", "123456"));
// TODO 注意安装路径
Path caCertificatePath = Paths.get("F:\\安装包\\elasticsearch-8.2.2\\config\\certs\\http_ca.crt");
CertificateFactory factory =
CertificateFactory.getInstance("X.509");
Certificate trustedCa;
try (InputStream is = Files.newInputStream(caCertificatePath)) {
trustedCa = factory.generateCertificate(is);
}
KeyStore trustStore = KeyStore.getInstance("pkcs12");
trustStore.load(null, null);
trustStore.setCertificateEntry("ca", trustedCa);
SSLContextBuilder sslContextBuilder = SSLContexts.custom()
.loadTrustMaterial(trustStore, null);
final SSLContext sslContext = sslContextBuilder.build();
clientBuilder.setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setSSLContext(sslContext).setDefaultCredentialsProvider(credentialsProvider));
return clientBuilder.build();
}
}
4. 参考文章
ElasticSearch入门篇（保姆级教程）
Java 连接ES方式
Elasticsearch：使用 Elasticsearch Java client 8.0 来连接带有 HTTPS 的集群
