springboot整合Elasticsearch（High Level REST Client方式）

Bertha 。 2022-12-26 07:29 238阅读 0赞

**注意：spring的elasticsearch会与High Level REST Client会产生冲突**

--------------------

## 1.引入jar包（pom文件中添加） ##

<dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-high-level-client</artifactId>
        <version>7.10.0</version>
    </dependency>

如果你也跟我一样，项目中用的是springboot 2.1.7.RELEASE，那么应该使用6.4.3的elasticsearch-rest-high-level-client，因为会存在版本冲突

<dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-high-level-client</artifactId>
        <version>6.4.3</version>
    </dependency>

## 2.在配置文件（application.yml）中配置 ##

elasticsearch:
      hostname: 127.0.0.1
      port: 9200

## 3.创建RestClientConfig ##

import org.apache.http.Header;
    import org.apache.http.HttpHost;
    import org.apache.http.message.BasicHeader;
    import org.elasticsearch.client.RestClient;
    import org.elasticsearch.client.RestClientBuilder;
    import org.elasticsearch.client.RestHighLevelClient;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.apache.http.client.config.RequestConfig;
    
    /**
     * @author 
     * @Date 2020-12-08 15:12
     * @Version 1.0
     * @name es
     */
    @Configuration
    public class RestClientConfig {
    
        @Value("${elasticsearch.hostname}")
        private String hostname;
    
        @Value("${elasticsearch.port}")
        private int port;
    
        /**
         * LowLevelRestConfig
         *
         * @param
         * @return org.elasticsearch.client.RestClient
         * @author wliduo[i@dolyw.com]
         * @date 2019/8/12 18:56
         */
        @Bean
        public RestClient restClient() {
            // 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是端口，参数3是通信协议
            RestClientBuilder clientBuilder = RestClient.builder(new HttpHost(hostname, port, "http"));
            // 设置Header编码
            Header[] defaultHeaders = {new BasicHeader("content-type", "application/json")};
            clientBuilder.setDefaultHeaders(defaultHeaders);
            // 添加其他配置，这些配置都是可选的，详情配置可看https://blog.csdn.net/jacksonary/article/details/82729556
            return clientBuilder.build();
        }
    
        /**
         * HighLevelRestConfig
         *
         * @param
         * @return org.elasticsearch.client.RestClient
         * @author wliduo[i@dolyw.com]
         * @date 2019/8/12 18:56
         */
        @Bean
        public RestHighLevelClient restHighLevelClient() {
            // 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是端口，参数3是通信协议
            // 该方法接收一个RequestConfig.Builder对象，对该对象进行修改后然后返回。
            return new RestHighLevelClient(RestClient.builder(new HttpHost(hostname, port, "http"))
                    .setRequestConfigCallback(requestConfigBuilder -> {
                        return requestConfigBuilder.setConnectTimeout(5000 * 1000) // 连接超时（默认为1秒）
                                .setSocketTimeout(6000 * 1000);// 套接字超时（默认为30秒）//更改客户端的超时限制默认30秒现在改为100*1000分钟
                    }));
        }
    
    }

## 4.创建接口测试 ##

import com.alibaba.fastjson.JSONObject;
    import com.boying.platform.common.utils.ResultUtil;
    import com.boying.platform.common.vo.Result;
    import lombok.extern.slf4j.Slf4j;
    import org.apache.http.Header;
    import org.apache.http.HttpHost;
    import org.apache.http.RequestLine;
    import org.apache.http.entity.ContentType;
    import org.apache.http.nio.entity.NStringEntity;
    import org.apache.http.util.EntityUtils;
    import org.elasticsearch.action.index.IndexRequest;
    import org.elasticsearch.client.*;
    import org.elasticsearch.common.xcontent.XContentBuilder;
    import org.elasticsearch.common.xcontent.json.JsonXContent;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.*;
    
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.regex.Pattern;
    
    /**
     * @author lzy
     * @Date 2020-12-08 15:15
     * @Version 1.0
     * @name ES测试
     */
    @Slf4j
    @RestController
    @RequestMapping("/lowApi")
    @CrossOrigin(maxAge = 3600)
    public class LowLevelRestController {
    
        /**
         * PATTERN
         */
        private static Pattern PATTERN = Pattern.compile("\\s*|\t|\r|\n");
    
        @Autowired
        private RestClient restClient;
    
        @GetMapping("/test")
        public Result<Object> test(){
            return new ResultUtil<>().setSuccessMsg("操作成功");
        }
    
        /**
         * 同步执行HTTP请求
         *
         * @param
         * @return org.springframework.http.ResponseEntity<java.lang.String>
         * @throws IOException
         * @author wliduo[i@dolyw.com]
         * @date 2019/8/8 17:15
         */
        @GetMapping("/es")
        public Result<Object> getEsInfo() throws IOException {
            Request request = new Request("GET", "/");
            // performRequest是同步的，将阻塞调用线程并在请求成功时返回Response，如果失败则抛出异常
            String responseBody = "";
            try {
                Response response = restClient.performRequest(request);
                // 获取请求行
                RequestLine requestLine = response.getRequestLine();
                // 获取host
                HttpHost host = response.getHost();
                // 获取状态码
                int statusCode = response.getStatusLine().getStatusCode();
                // 获取响应头
                Header[] headers = response.getHeaders();
                // 获取响应体
                responseBody = EntityUtils.toString(response.getEntity());
            }catch (Exception e){
                log.error(String.valueOf(e));
                return new ResultUtil<>().setErrorMsg("请求超时");
            }
            return new ResultUtil<>().setData(JSONObject.parseObject(responseBody));
        }
    
    
        /**
         * 异步执行HTTP请求
         *
         * @param
         * @return org.springframework.http.ResponseEntity<java.lang.String>
         * @author wliduo[i@dolyw.com]
         * @date 2019/8/8 17:15
         */
        @GetMapping("/es/async")
        public Result<Object> asynchronous() {
            Request request = new Request("GET", "/");
            restClient.performRequestAsync(request, new ResponseListener() {
                @Override
                public void onSuccess(Response response) {
                    log.info("异步执行HTTP请求并成功");
                    log.info(JSONObject.toJSONString(response));
                }
    
                @Override
                public void onFailure(Exception exception) {
                    log.error("异步执行HTTP请求并失败");
                    log.error(JSONObject.toJSONString(exception));
                }
            });
            return new ResultUtil<>().setData(null);
        }
    
        /**
         * 分词分页查询列表
         *
         * @param page
         * @param rows
         * @param keyword
         * @return com.example.common.ResponseBean
         * @author wliduo[i@dolyw.com]
         * @date 2019/8/9 15:32
         */
        @GetMapping("/book")
        public Result<Object> getBookList(@RequestParam(defaultValue = "1") Integer page,
                                        @RequestParam(defaultValue = "10") Integer rows,
                                        String keyword) {
            Request request = new Request("POST", "/_search");
            // 添加Json返回优化
            request.addParameter("pretty", "true");
            // 拼接查询Json
            IndexRequest indexRequest = new IndexRequest();
            XContentBuilder builder = null;
            Response response = null;
            String responseBody = null;
            try {
                builder = JsonXContent.contentBuilder()
                        .startObject()
                        .startObject("query")
                        .startObject("multi_match")
                        .field("query", keyword)
                        .array("fields", "name", "desc")
                        .endObject()
                        .endObject()
                        .startObject("sort")
                        .startObject("id")
                        .field("order", "desc")
                        .endObject()
                        .endObject()
                        .endObject();
                indexRequest.source(builder);
                // 设置请求体并指定ContentType，如果不指定会乱码
                request.setEntity(new NStringEntity(indexRequest.source().utf8ToString(), ContentType.APPLICATION_JSON));
                // 执行HTTP请求
                response = restClient.performRequest(request);
                responseBody = EntityUtils.toString(response.getEntity());
            } catch (IOException e) {
                return new ResultUtil<>().setData(null);
            }
            return new ResultUtil<>().setData(JSONObject.parseObject(responseBody));
        }
    
        /**
         * 根据Id获取ES对象
         *
         * @param id
         * @return org.springframework.http.ResponseEntity<java.lang.String>
         * @author wliduo[i@dolyw.com]
         * @date 2019/8/8 17:48
         */
        @GetMapping("/book/{id}")
        public Result<Object> getBookById(@PathVariable("id") String id) {
            Request request = new Request("GET", "/book/book/" +
                    id);
            // 添加Json返回优化
            request.addParameter("pretty", "true");
            Response response = null;
            String responseBody = null;
            try {
                // 执行HTTP请求
                response = restClient.performRequest(request);
                responseBody = EntityUtils.toString(response.getEntity());
            } catch (IOException e) {
                return new ResultUtil<>().setErrorMsg("");
            }
            return new ResultUtil<>().setData(JSONObject.parseObject(responseBody));
        }
    
        /**
         * 添加ES对象, Book的ID就是ES中存储的Document的ID，ES的POST和PUT可以看下面这个文章
         * https://blog.csdn.net/z457181562/article/details/93470152
         *
         * @param
         * @return org.springframework.http.ResponseEntity<java.lang.String>
         * @throws IOException
         * @author wliduo[i@dolyw.com]
         * @date 2019/8/8 17:46
         */
        @PostMapping("/add")
        public Result<Object> add() throws IOException {
            // Endpoint直接指定为Index/Type的形式
            /*Request request = new Request("POST", new StringBuilder("/book/book/").toString());*/
            // 防重复新增数据
            Map<String,String> testMap = new HashMap<>(31);
            testMap.put("ID",String.valueOf(System.currentTimeMillis()));
            testMap.put("TESTVALUE","TESTVALUE");
            Request request = new Request("PUT", "/book/book/" +
                    testMap.get("ID") + "/_create");
            // 设置其他一些参数比如美化Json
            request.addParameter("pretty", "true");
            // 设置请求体并指定ContentType，如果不指定会乱码
            request.setEntity(new NStringEntity(JSONObject.toJSONString(testMap), ContentType.APPLICATION_JSON));
            // 发送HTTP请求
            Response response = restClient.performRequest(request);
            // 获取响应体
            String responseBody = EntityUtils.toString(response.getEntity());
            return new ResultUtil<>().setData(JSONObject.parseObject(responseBody));
        }
    }

XContentBuilder 使用方法[https://blog.csdn.net/qq\_39187822/article/details/110954406][https_blog.csdn.net_qq_39187822_article_details_110954406]

[https_blog.csdn.net_qq_39187822_article_details_110954406]: https://blog.csdn.net/qq_39187822/article/details/110954406