jest for elasticsearch

*elasticsearch（后面简称es）

• 背景： 目前项目应用中对es的操作用的是http（自己封装）的一套方法；有些数据处理起来还是需要定制开发处理，不是很方便。正好需要对本项目重新进行改造，于是采用第三方工具包jest 对es的操作进行重新的梳理改造。

• why use jest
  官方有个大致的介绍：Jest is a Java HTTP Rest client for ElasticSearch.It is actively developed and tested by Searchly.

  jset优势
  1）提供Restful API， 原生ES API不具备；
  2）Jest支持不同版本的es基本操作 主要是http rest client；

• maven 管理项目：

  
  io.searchbox
  jest
  2.0.3
  

• jest使用

  

  网上有很多（上述图片中）的方法实例，下面就不具体的介绍了（链接如下）
  http://blog.csdn.net/u010466329/article/details/75020956
  https://github.com/searchbox-io/Jest

  结合源代码封装了一个可以直接传递url的method，该方法的实现就是结合了jest 源码，实现了自己想要的接口（用于用户页面自定义查询 更方便）。 代码如下：

  AbstractLocalHttpAction （本地HttpAction）

  /**
  * methodName "http" "delete" "put" "get" “post”
  * queryParam 参数
  * url 请求链接
  */
  public abstract class AbstractLocalHttpAction extends AbstractAction {

  protected String methodName;

  private String queryParam;

  private String url;

  public AbstractLocalHttpAction(AbstractLocalHttpAction.Builder builder) {
  super(builder);
  this.queryParam = builder.queryParam;
  this.methodName = builder.methodName;
  this.url = builder.url;
  }

  public String getMethodName() {
  return this.methodName;
  }

  public String getQueryParam() {
  return this.queryParam;
  }

  public String getUrl() {
  return this.url;
  }

  protected String buildURI() {
  StringBuilder sb = new StringBuilder(super.buildURI());

  return sb.toString();
  }

  protected abstract static class Builder<T extends AbstractLocalHttpAction, K> extends io.searchbox.action.AbstractAction.Builder<T, K> {
  private String url;
  private String methodName;
  private String queryParam;

  protected Builder() {
  }

  public K url(String url) {
  this.url = url;
  return (K)this;
  }

  public K methodName(String methodName) {
  this.methodName = methodName;
  return (K)this;
  }

  public K queryParam(String queryParam) {
  this.queryParam = queryParam;
  return (K)this;
  }

  }
  }

LocalResultAbstractAction

public abstract class LocalResultAbstractAction extends AbstractLocalHttpAction {

public LocalResultAbstractAction(Builder builder) {
super(builder);
}

public JestResult createNewElasticSearchResult(String responseBody, int statusCode, String reasonPhrase, Gson gson) {
return (JestResult)this.createNewElasticSearchResult(new JestResult(gson), responseBody, statusCode, reasonPhrase, gson);
}
}

JestLocalHttpClient（用法build入口）

public class JestLocalHttpClient extends LocalResultAbstractAction {

private String query;

protected JestLocalHttpClient(JestLocalHttpClient.Builder builder) {
super(builder);
this.setURI(this.buildURI()+""+getUrl());
this.query = getQueryParam();
}

public String getRestMethodName() {
return getMethodName();
}

public String getData(Gson gson) {
String data = this.query;
return data;
}
public static class Builder extends AbstractLocalHttpAction.Builder<JestLocalHttpClient, JestLocalHttpClient.Builder> {

public Builder(String url, String methodName,String queryParam) {
this.url(url);
this.methodName(methodName);
this.queryParam(queryParam);
}
public JestLocalHttpClient build() {
return new JestLocalHttpClient(this);
}
}

}

jestManager 封装如下

public class JestManager {

private static final Logger LOGGER = LoggerFactory.getLogger(JestManager.class);
/**
* 获取JestClient对象
* @return
*/
public static JestClient getJestClient(String clustName) {
JestClientFactory factory = new JestClientFactory();
Cluster cluster = CLUSTERMAP.get(clusterName);
try {
notes.add("http://"+cluster.getHost()+":"+cluster.getHttprt());
HttpClientConfig.Builder httpClientConfig = new HttpClientConfig
.Builder(notes)
.connTimeout(1500)
.readTimeout(3000)
.multiThreaded(true);
factory.setHttpClientConfig(httpClientConfig.build());
}catch (Exception e){
e.printStackTrace();
LOGGER.error("初始化jestclient实例失败："+e.getMessage());
}
return factory.getObject();
}
}

上面自己的封装方法调用如下

public JestResult httpProxy(String clustName, String url, String methodName, String queryParam) {
JestResult result = null ;
try {
JestLocalHttpClient jestLocalHttpClient = new JestLocalHttpClient.Builder(url,methodName,queryParam).build();
result = JestManager.getJestClient(clustName).execute(jestLocalHttpClient);
} catch (IOException e) {
e.printStackTrace();
LOGGER.error("jestLocalHttpClient失败："+e.getStackTrace());
}
return result ;
}

测试如下

url：/demo/_search?pretty
method:get
queryParam:null

调用接口：返回信息
"{
"took" : 3,
"timed_out" : false,
"_shards" : {
"total" : 5,
"successful" : 5,
"failed" : 0
},
"hits" : {
"total" : 0,
"max_score" : null,
"hits" : [ ]
}
}
"

jest 用起来很方便，方法的封装让我们代码写起来更为简单。以上的内容希望能对大家有所帮助。