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Elastic Stack：Java客户端连接ElasticSearch

一.pom.xml

 二.基本步骤

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public class TestDemo {
    public static void main(String[] args) throws IOException {
        //获取连接客户端
        RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(new HttpHost("192.168.10.138", 9200, "http")));
        //构建请求
        GetRequest request = new GetRequest("book", "1");
        //执行
        GetResponse fields = client.get(request, RequestOptions.DEFAULT);
        //获取结果
        System.out.println(fields.getId());
        System.out.println(fields.getSource());
    }
}

 执行结果：

三.使用springboot测试

配置文件 application.yml：

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spring:
  application:
    name: search-service
test:
  elasticsearch:
    address: 192.168.10.138
    port: 9200

 配置类：

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@Configuration
public class EsConfig {
 
    @Value("${test.elasticsearch.address}")
    private String address;
 
    @Value("${test.elasticsearch.port}")
    private Integer port;
 
    @Bean(destroyMethod = "close")
    public RestHighLevelClient restHighLevelClient(){
        return new RestHighLevelClient(RestClient.builder(new HttpHost(address, port, "http")));
    }
 
}

 测试类：

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@SpringBootTest(classes = SearchApplication.class)
@RunWith(SpringRunner.class)
public class TestDocument {
 
    @Qualifier("restHighLevelClient")
    @Autowired
    RestHighLevelClient client;
 
    @Test
    public void  test() throws IOException, InterruptedException {
        //构建请求
        GetRequest request = new GetRequest("book", "1");
        //设置可选参数
        FetchSourceContext context = new FetchSourceContext(true, new String[]{"name", "price"}, Strings.EMPTY_ARRAY);
        request.fetchSourceContext(context);
        //同步执行
        //GetResponse fields = client.get(request, RequestOptions.DEFAULT);
 
        //异步执行
        client.getAsync(request, RequestOptions.DEFAULT, new ActionListener<>() {
            //成功时的操作
            @Override
            public void onResponse(GetResponse documentFields) {
                //获取结果
                System.out.println(documentFields.getId());
                System.out.println(documentFields.getSource());
                System.out.println(documentFields.getSourceAsString());
                System.out.println(documentFields.getSourceAsMap());
                System.out.println(new String(documentFields.getSourceAsBytes()));
            }
            //失败的操作
            @Override
            public void onFailure(Exception e) {
                e.printStackTrace();
            }
        });
        Thread.sleep(5000);
    }
}

 查询结果：

四.测试文档新增

构建文档数据的四种方法：

直接使用json字符串构建：

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//构建请求
IndexRequest request = new IndexRequest("test_add");
request.id("2");
//构建文档数据
//方法1:直接写json字符串
String jsonStr = "{\n" +
        "    \"name\": \"php\",\n" +
        "    \"description\": \"php是世界上最好的语言\",\n" +
        "    \"studymodel\": \"201002\",\n" +
        "    \"price\":38.6,\n" +
        "    \"timestamp\":\"2019-08-25 19:11:35\",\n" +
        "    \"tags\": [ \"php\", \"开发\"]\n" +
        "}";
request.source(jsonStr, XContentType.JSON);
//设置超时时间
request.timeout(TimeValue.timeValueSeconds(2L));
//手动维护版本号
request.version(2);
request.versionType(VersionType.EXTERNAL);
//执行
IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);
System.out.println(indexResponse.getIndex());
System.out.println(indexResponse.getId());
System.out.println(indexResponse.getResult());

 运行结果：

 使用map构建：

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Map<String, Object> map = new HashMap<>();
map.put("user","john");
map.put("age","18");
map.put("time","2020-12-12");
request.source(map);

 使用XContentBuilder构建：

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XContentBuilder builder = XContentFactory.jsonBuilder().startObject();
        {
            builder.field("user","john");
            builder.field("age",18);
            builder.timeField("time","2020-12-12");
        }
        builder.endObject();
        request.source(builder);

 直接在request中构建：

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request.source("user","john").source("age","18").source("time","2020-12-12");

 异步：

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Cancellable cancellable = client.indexAsync(request, RequestOptions.DEFAULT, new ActionListener<>() {
    @Override
    public void onResponse(IndexResponse indexResponse) {
        System.out.println(indexResponse.getIndex());
        System.out.println(indexResponse.getId());
        System.out.println(indexResponse.getResult());
    }
 
    @Override
    public void onFailure(Exception e) {
        e.printStackTrace();
    }
});

 也可以进行更新操作：

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//构建请求
 IndexRequest request = new IndexRequest("test_add");
 request.id("4");
 //构建文档数据
 Map<String, Object> map = new HashMap<>();
 map.put("user","john");
 map.put("age","19");
 map.put("time","2020-12-12");
 request.source(map);
 //设置超时时间
 request.timeout(TimeValue.timeValueSeconds(2L));
 //手动维护版本号
 request.version(3);
 request.versionType(VersionType.EXTERNAL);
 //执行
 //IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);
 Cancellable cancellable = client.indexAsync(request, RequestOptions.DEFAULT, new ActionListener<>() {
     @Override
     public void onResponse(IndexResponse indexResponse) {
         System.out.println(indexResponse.getIndex());
         System.out.println(indexResponse.getId());
         System.out.println(indexResponse.getResult());
         if(indexResponse.getResult()== DocWriteResponse.Result.CREATED){
             DocWriteResponse.Result result = indexResponse.getResult();
             System.out.println(result);
         }else if(indexResponse.getResult()== DocWriteResponse.Result.UPDATED){
             DocWriteResponse.Result result = indexResponse.getResult();
             System.out.println(result);
         }
     }
 
     @Override
     public void onFailure(Exception e) {
         e.printStackTrace();
     }
 });
 Thread.sleep(5000);

对结果进行监控：

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ReplicationResponse.ShardInfo shardInfo = indexResponse.getShardInfo();
if(shardInfo.getTotal()!=shardInfo.getSuccessful()){
    System.out.println(shardInfo.getSuccessful());
    System.out.println(shardInfo.getTotal());
    System.out.println("处理成功的分片少于总分片");
}
if(shardInfo.getFailed()>0){
    for (ReplicationResponse.ShardInfo.Failure failure : shardInfo.getFailures()) {
        System.out.println(failure.reason());
    }
}

 五.测试修改：

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//创建请求
UpdateRequest request = new UpdateRequest("test_add","3");
Map<String, Object> map = new HashMap<>();
map.put("age","33");
request.doc(map);
//设置重试次数
request.retryOnConflict(4);
//执行
UpdateResponse response = client.update(request, RequestOptions.DEFAULT);
//获取结果
System.out.println(response.getId());
System.out.println(response.getResult());

 六.测试删除

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DeleteRequest request = new DeleteRequest("test_add", "3");
DeleteResponse response = client.delete(request, RequestOptions.DEFAULT);
System.out.println(response.getId());
System.out.println(response.getResult());

 七.测试bulk批量操作

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BulkRequest request = new BulkRequest();
request.add(new IndexRequest("test_add").id("6").source(XContentType.JSON,"address","3"));
request.add(new DeleteRequest("test_add").id("4"));
BulkResponse responses = client.bulk(request, RequestOptions.DEFAULT);
for (BulkItemResponse respons : responses) {
    DocWriteResponse response = respons.getResponse();
    switch (respons.getOpType()){
        case INDEX:
            System.out.println(response);
        case DELETE:
            System.out.println(response);
    }
}
posted @   秋风飒飒吹  阅读(303)  评论(0)  编辑  收藏  举报
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