java编写es搜索程序

川长思鸟来 2022-04-11 02:28 340阅读 0赞

开发环境：java8 springboot

pom文件导入依赖

<dependency>
                <groupId>org.elasticsearch.client</groupId>
                <artifactId>transport</artifactId>
                <version>6.3.1</version>
            </dependency>
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-core</artifactId>
                <version>2.11.1</version>
            </dependency>
    
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-api</artifactId>
                <version>2.11.1</version>
            </dependency>
    
            <dependency>
                <groupId>org.elasticsearch.client</groupId>
                <artifactId>elasticsearch-rest-client</artifactId>
                <version>6.3.2</version>
            </dependency>

连接es返回数据的核心代码：

/**
         * 获取ES数据
         * @param modules　索引
         * @param urlArg url中的部分参数
         * @param jsonString    请求体
         */  
    private String getEsData(String modules,String urlArg,String jsonString) {
            RestClient restClient = RestClient.builder(
                    new HttpHost("192.168.1.1", 9200, "http")).build();
    
            Map<String, String> params = Collections.emptyMap();
            HttpEntity entity = new NStringEntity(jsonString, ContentType.APPLICATION_JSON);
    
            String url = "/" + modules + "/" + urlArg;
            Response response = null;
            try {
                response = restClient.performRequest("GET", url,params,entity);
            } catch (IOException e) {
                log.info("[es] GET请求异常");
                e.printStackTrace();
            }
    
    
            String responseBody = "";
            try {
                assert response != null;
                responseBody = EntityUtils.toString(response.getEntity());
                log.info("[es]:成功获取搜索数据");
            } catch (IOException e) {
                e.printStackTrace();
                log.info("[es]:获取responseBody异常");
            }
    
            try {
                restClient.close();
            } catch (IOException e) {
                e.printStackTrace();
                log.info("[es]:restClient关闭异常");
            }
            return responseBody;
        }

获取responseBody之后可用jsonNode等方法对数据进行解析