java编写es搜索程序

 

开发环境：java8 springboot 

pom文件导入依赖

        <!--ES所需依赖-->
        <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