jsp 语言 JSP 与 Elasticsearch 进行全文检索示例

JSP阿木 发布于 20 天前 4 次阅读

JSP 与 Elasticsearch 进行全文检索示例

随着互联网的快速发展，信息量的爆炸式增长，如何快速、准确地检索到所需信息成为了一个重要课题。全文检索技术应运而生，它能够对大量文本数据进行高效检索。Elasticsearch 是一个基于 Lucene 的开源全文搜索引擎，具有高性能、易扩展等特点。本文将结合 JSP（JavaServer Pages）技术，展示如何使用 Elasticsearch 实现一个简单的全文检索示例。

环境准备

在开始编写代码之前，我们需要准备以下环境：

1. JDK 1.8 或更高版本

2. Tomcat 8.5 或更高版本

3. Elasticsearch 6.x 或更高版本

4. Maven 3.6 或更高版本

1. 创建 Maven 项目

我们需要创建一个 Maven 项目，并添加以下依赖：

xml
<dependencies>

    <!-- JSP 标准库 -->

    <dependency>

        <groupId>javax.servlet.jsp</groupId>

        <artifactId>javax.servlet.jsp-api</artifactId>

        <version>2.3.3</version>

        <scope>provided</scope>

    </dependency>

    <!-- Elasticsearch 客户端 -->

    <dependency>

        <groupId>org.elasticsearch.client</groupId>

        <artifactId>elasticsearch-rest-high-level-client</artifactId>

        <version>7.10.1</version>

    </dependency>

</dependencies>

2. 配置 Elasticsearch

1. 下载 Elasticsearch 安装包并解压。

2. 修改 `elasticsearch.yml` 文件，配置 Elasticsearch 集群名称、节点名称、数据存储路径等参数。

3. 启动 Elasticsearch 服务。

3. 编写 JSP 页面

创建一个名为 `search.jsp` 的 JSP 页面，用于接收用户输入的查询关键字，并调用 Elasticsearch 进行搜索。

jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>全文检索示例</title>

</head>

<body>

    <form action="search.jsp" method="get">

        <input type="text" name="query" placeholder="请输入查询关键字" />

        <input type="submit" value="搜索" />

    </form>

    <c:if test="${not empty results}">

        <h3>搜索结果：</h3>

        <ul>

            <c:forEach var="hit" items="${results}">

                <li><a href="${hit._source.url}">${hit._source.title}</a></li>

            </c:forEach>

        </ul>

    </c:if>

</body>

</html>

4. 编写 Servlet

创建一个名为 `SearchServlet` 的 Servlet，用于处理搜索请求，并调用 Elasticsearch 进行搜索。

```java

import org.apache.http.HttpHost;

import org.elasticsearch.action.search.SearchRequest;

import org.elasticsearch.action.search.SearchResponse;

import org.elasticsearch.client.RequestOptions;

import org.elasticsearch.client.RestClient;

import org.elasticsearch.client.RestHighLevelClient;

import org.elasticsearch.index.query.QueryBuilders;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.elasticsearch.search hit.Hits;

import org.elasticsearch.search hit.HitsMetadata;

import org.elasticsearch.search hit.HitsMetadata.Hits;

import org.elasticsearch.search hit.HitsMetadata.HitsMetadata;

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