ElasticSearch java篇学习笔记（二）- 创建索引(Index)

创建索引

     es中创建创建Index提供了四中方法：

     ①：JSON

     ②：MAP

     ③：bean

     ④：ES自己提供的工具

下面逐个练习：

下面用到的工具类：

/**
 * 搜索平台-ELASTIC-INDEX:
 * 

 * 索引信息
 *
 * @author 骆林 2018-06-21
 */
public class Index {

    /**
     * 索引
     */
    private String index;

    /**
     * 类型
     */
    private String type;

    /**
     * ID
     */
    private String id;

    public String getIndex() {
        return index;
    }

    public void setIndex(String index) {
        this.index = index;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}

单元测试类：

/**
 * 搜索平台-ELASTIC-INDEX:
 * 

 * index工具类
 *
 * @author 骆林 2018-06-21
 */
public class IndexTest {

    public static TransportClient client = null;
    public static Index index = new Index();
    @Before
    public void initClient(){
        client = ESClient.getClient();
        index.setIndex("staff");
        index.setType("user");
    }

    @Test
    public void indexString(){

        String json = "{" +
                      "\"username\":\"luolin\"," +
                      "\"password\":\"123456\"," +
                      "\"realname\":\"骆林\"," +
                      "\"age\":\"27\"," +
                      "\"sex\":\"man\"" +
                      "}";
        ESIndex esIndex = new ESIndex();
        index.setId("1");
        Boolean result = esIndex.StringCreate(client,json,index);
        client.close();

    }

    @Test
    public void indexMap(){

        Map,Object> map = new HashMap,Object>();
        map.put("username","hello");
        map.put("password","123456");
        map.put("realname","AA");
        map.put("age","25");
        map.put("sex","woman");

        ESIndex esIndex = new ESIndex();
        index.setId("2");
        Boolean result = esIndex.mapCreate(client,map,index);
        client.close();

    }

    @Test
    public void indexBean() throws JsonProcessingException{
        User user = new User();
        user.setUsername("阿三");
        user.setPassword("123456789");
        user.setRealname("刘能");
        user.setAge(60);
        user.setSex("man");
        ESIndex esindex = new ESIndex();
        index.setId("3");
        Boolean result = esindex.beanCreate(client,user,index);
        client.close();
    }

    @Test
    public void indexEsHelp() throws IOException{
        ESIndex esIndex = new ESIndex();
        index.setId("4");
        Boolean result = esIndex.EsHelpCreate(client,index);
        client.close();
    }
}

由于这个比较简单：所以直接上代码

一：用JSON的方式创建Index

/**
* JSON创建索引
*
* @param  client ES客户端
* @param  index json文档
* @return java.lang.Boolean
* @author [luo.lin] [ 2018/6/21 16:37]
*/
public Boolean StringCreate(TransportClient client, String json, Index index){

    IndexResponse response = client.prepareIndex(index.getIndex(),index.getType(),index.getId())
                                    .setSource(index, XContentType.JSON)
                                    .get();

    RestStatus status = response.status();

    if(response.getResult().equals("created")){
        return true;
    }
    return false;
}

测试方法：上面测试类中的方法

@Test
public void indexString(){

    String json = "{" +
                  "\"username\":\"luolin\"," +
                  "\"password\":\"123456\"," +
                  "\"realname\":\"骆林\"," +
                  "\"age\":\"27\"," +
                  "\"sex\":\"man\"" +
                  "}";
    ESIndex esIndex = new ESIndex();
    index.setId("1");
    Boolean result = esIndex.StringCreate(client,json,index);
    client.close();

}

二：使用MAP的方式创建Index

/**
 * map创建索引
 *
 * @param  client ES客户端
 * @param  mapEntry map文档对象
 * @return java.lang.Boolean
 * @author [luo.lin] [ 2018/6/21 16:37]
 */
public Boolean mapCreate(TransportClient client,Map,Object> mapEntry,Index index){

    IndexResponse response = client.prepareIndex(index.getIndex(),index.getType(),index.getId())
                                   .setSource(mapEntry,XContentType.JSON)
                                   .get();

    if(response.getResult().equals("created")){
        return true;
    }
    return false;

}

测试方法：上面测试类中的方法

@Test
public void indexMap(){

    Map,Object> map = new HashMap,Object>();
    map.put("username","hello");
    map.put("password","123456");
    map.put("realname","AA");
    map.put("age","25");
    map.put("sex","woman");

    ESIndex esIndex = new ESIndex();
    index.setId("2");
    Boolean result = esIndex.mapCreate(client,map,index);
    client.close();

}

三：使用实例bean的方式创建Index

/**
 * bean创建索引
 *
 * @param  client ES客户端
 * @param  user bean实例
 * @return java.lang.Boolean
 * @author [luo.lin] [ 2018/6/21 16:37]
 */
public Boolean beanCreate(TransportClient client, User user,Index index) throws JsonProcessingException{

    ObjectMapper mapper = new ObjectMapper();
    byte[] json = mapper.writeValueAsBytes(user);

    IndexResponse response = client.prepareIndex(index.getIndex(),index.getType(),index.getId())
                                   .setSource(json,XContentType.JSON)
                                   .get();
    if(response.getResult().equals("created")){
        return true;
    }
    return  false;

}

测试方法：上面测试类中的方法

/**
 * bean创建索引
 *
 * @param  client ES客户端
 * @param  user bean实例
 * @return java.lang.Boolean
 * @author [luo.lin] [ 2018/6/21 16:37]
 */
public Boolean beanCreate(TransportClient client, User user,Index index) throws JsonProcessingException{

    ObjectMapper mapper = new ObjectMapper();
    byte[] json = mapper.writeValueAsBytes(user);

    IndexResponse response = client.prepareIndex(index.getIndex(),index.getType(),index.getId())
                                   .setSource(json,XContentType.JSON)
                                   .get();
    if(response.getResult().equals("created")){
        return true;
    }
    return  false;

}

四：使用ES提供的工具创建Index

/**
* 方法EsHelpCreate的功能描述
*
* @param  client ES客户端
 *@param index 索引对象
* @return boolean
* @author [luo.lin] [ 2018/7/4 20:39]
*/
public boolean EsHelpCreate(TransportClient client,Index index) throws IOException{

    XContentBuilder builder = jsonBuilder()
                              .startObject()
                              .field("username","zhaosi")
                              .field("password","9876554321")
                              .field("realname","赵四")
                              .field("age",65)
                              .field("sex","man")
                              .endObject();

    String json = builder.string();

    IndexResponse response = client.prepareIndex(index.getIndex(),index.getType(),index.getId())
                                   .setSource(json,XContentType.JSON)
                                   .get();

    if(response.getResult().toString().equals("created")){
        return true;
    }
    return false;

}

测试方法：上面测试类中的方法

@Test
public void indexEsHelp() throws IOException{
    ESIndex esIndex = new ESIndex();
    index.setId("4");
    Boolean result = esIndex.EsHelpCreate(client,index);
    client.close();
}

注：如果使用ES自带的工具类创建Index，则需要导入jackson

    com.fasterxml.jackson.core
    jackson-databind
    2.9.5

总结：

       ES通过提供prepareIndex方法来创建创建Index，并且用IndexResponse 对象来封装创建的结构信息，

      IndexResponse的构造方法为:

public IndexResponse(ShardId shardId, String type, String id, long seqNo, long primaryTerm, long version, boolean created) {
    super(shardId, type, id, seqNo, primaryTerm, version, created ? Result.CREATED : Result.UPDATED);
}

其中包含了当前索引的类型、id、版本号、操作结果等相关信息