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大家好，我是你们的导师，我每天都会在这里给大家分享一些干货内容(当然了，周末也要允许老师休息一下哈)。上次老师跟大家分享了IntelliJ IDEA 构建maven多模块工程项目的知识，今天跟大家分享下Spring Boot集成ElasticSearch的知识。

1 Spring Boot集成ElasticSearch

pom.xml文件中，依赖的各jar包版本如下：

<parent>    <groupId>org.springframework.bootgroupId>    <artifactId>spring-boot-starter-parentartifactId>    <version>2.0.3.RELEASEversion>    <relativePath/> parent><properties>    <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>    <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>    <java.version>1.8java.version>    <elasticsearch.version>5.5.2elasticsearch.version>properties><dependencies>    <dependency>        <groupId>org.springframework.bootgroupId>        <artifactId>spring-boot-starter-webartifactId>    dependency>    <dependency>        <groupId>org.projectlombokgroupId>        <artifactId>lombokartifactId>        <optional>trueoptional>    dependency>    <dependency>        <groupId>org.springframework.bootgroupId>        <artifactId>spring-boot-starter-testartifactId>        <scope>testscope>    dependency>    <dependency>        <groupId>org.elasticsearch.clientgroupId>        <artifactId>transportartifactId>        <version>${elasticsearch.version}version>    dependency>dependencies>

在工程中新建一个config包，在该包中创建一个ESConfig配置类，用于构造es的客户端实例对象。代码如下：

@Configurationpublic class ESConfig {    @Bean    public TransportClient client() throws UnknownHostException {        // 9300是es的tcp服务端口        InetSocketTransportAddress node = new InetSocketTransportAddress(                InetAddress.getByName("192.168.190.129"),                9300);        // 设置es节点的配置信息        Settings settings = Settings.builder()                .put("cluster.name", "es")                .build();        // 实例化es的客户端对象        TransportClient client = new PreBuiltTransportClient(settings);        client.addTransportAddress(node);        return client;    }}

2 查询接口开发

我现在有一个结构化的索引如下：

该索引中有一些文档数据，如下：

在工程中新建一个controller包，在该包中新建一个 BookCrudController 类，用于演示es增删查改接口demo。我们首先来开发查询接口，代码如下：

@RestController@RequestMapping("/es/demo")public class BookCrudController {    @Autowired    private TransportClient client;    /**     * 按id查询     * @param id     * @return     */    @GetMapping("/get/book/novel")    public ResponseEntity searchById(@RequestParam("id") String id) {        if (id.isEmpty()) {            return new ResponseEntity(HttpStatus.NOT_FOUND);        }        // 通过索引、类型、id向es进行查询数据        GetResponse response = client.prepareGet("book", "novel", id).get();        if (!response.isExists()) {            return new ResponseEntity(HttpStatus.NOT_FOUND);        }        // 返回查询到的数据        return new ResponseEntity(response.getSource(), HttpStatus.OK);    }}

启动SpringBoot工程，使用postman进行测试，查询结果如下：

3 新增接口开发 在 BookCrudController 类中开发新增接口，代码如下：

@PostMapping("/add/book/novel")public ResponseEntity add(@RequestParam("title") String title,                          @RequestParam("author") String author,                          @RequestParam("word_count") int wordCount,                          @RequestParam("publish_date")                          @DateTimeFormat(pattern = "yyy-MM-dd HH:mm:ss")                                  Date publishDate) {    try {        // 将参数build成一个json对象        XContentBuilder content = XContentFactory.jsonBuilder()                .startObject()                .field("title", title)                .field("author", author)                .field("word_count", wordCount)                .field("publish_date", publishDate.getTime())                .endObject();        IndexResponse response = client.prepareIndex("book", "novel")                .setSource(content)                .get();        return new ResponseEntity(response.getId(), HttpStatus.OK);    } catch (IOException e) {        e.printStackTrace();        return new ResponseEntity(HttpStatus.INTERNAL_SERVER_ERROR);    }}

重启SpringBoot工程，使用postman进行测试，测试结果如下：

使用返回的id去查询我们刚刚添加的书籍数据，结果如下：

4 删除接口开发

代码如下：

@DeleteMapping("/delete/book/novel")public ResponseEntity delete(@RequestParam("id") String id) {    DeleteResponse response = client.prepareDelete("book", "novel", id).get();    return new ResponseEntity(response.getResult(), HttpStatus.OK);}

重启SpringBoot工程，使用postman进行测试，删除数据成功：

5 更新接口开发

代码如下：

@PutMapping("/update/book/novel")public ResponseEntity update(@RequestParam("id") String id,                             @RequestParam(value = "title", required = false) String title,                             @RequestParam(value = "author", required = false) String author,                             @RequestParam(value = "word_count", required = false) Integer wordCount,                             @RequestParam(value = "publish_date", required = false)                             @DateTimeFormat(pattern = "yyy-MM-dd HH:mm:ss")                                     Date publishDate) {    UpdateRequest update = new UpdateRequest("book", "novel", id);    try {        XContentBuilder builder = XContentFactory.jsonBuilder()                .startObject();        if (title != null) {            builder.field("title", title);        }        if (author != null) {            builder.field("author", author);        }        if (wordCount != null) {            builder.field("word_count", wordCount);        }        if (publishDate != null) {            builder.field("publish_date", publishDate.getTime());        }        builder.endObject();        update.doc(builder);        UpdateResponse response = client.update(update).get();        return new ResponseEntity(response.getResult().toString(), HttpStatus.OK);    } catch (Exception e) {        e.printStackTrace();        return new ResponseEntity(HttpStatus.INTERNAL_SERVER_ERROR);    }}

例如我们要修改文档id为AWQ-N_XeWWbfsfQzkrTh的书籍数据：

修改书籍的标题和作者：

修改成功：

6 复合查询接口开发

代码如下：

@PostMapping("/query/book/novel")public ResponseEntity query(@RequestParam(value = "title", required = false) String title,                            @RequestParam(value = "author", required = false) String author,                            @RequestParam(value = "word_count", required = false) Integer wordCount,                            @RequestParam(value = "publish_date", required = false)                            @DateTimeFormat(pattern = "yyy-MM-dd HH:mm:ss")                                    Date publishDate,                            @RequestParam(value = "gt_word_count", defaultValue = "0") Integer gtWordCount,                            @RequestParam(value = "lt_word_count", required = false) Integer ltWordCount) {    // 组装查询条件    BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();    if (title != null) {        boolQuery.must(QueryBuilders.matchQuery("title", title));    }    if (author != null) {        boolQuery.must(QueryBuilders.matchQuery("author", author));    }    if (wordCount != null) {        boolQuery.must(QueryBuilders.matchQuery("word_count", wordCount));    }    if (publishDate != null) {        boolQuery.must(QueryBuilders.matchQuery("publish_date", publishDate));    }    // 以word_count作为条件范围    RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("word_count").from(gtWordCount);    if (ltWordCount != null && ltWordCount > 0) {        rangeQuery.to(ltWordCount);    }    boolQuery.filter(rangeQuery);    // 组装查询请求    SearchRequestBuilder requestBuilder = client.prepareSearch("book")            .setTypes("novel")            .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)            .setQuery(boolQuery)            .setFrom(0)            .setSize(10);    // 发送查询请求    SearchResponse response = requestBuilder.get();    // 组装查询到的数据集    ListString,     for (SearchHit searchHitFields : response.getHits()) {        result.add(searchHitFields.getSource());    }    return new ResponseEntity(result, HttpStatus.OK);}

重启SpringBoot工程，使用postman进行测试，测试结果如下：

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