Vert.x整合MongoDB实现通用增删改查

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前言

最近在学习MongoDB的基本功能，只看文档过于无趣了，于是用Vert.x写了个demo加深印象，也在此记录一下。

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一、框架搭建

Vert.x使用的版本是4.4.4，主要用到了vertx-web和vertx-mongo-client。

<properties>
    <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>

    <maven.compiler.source>1.8maven.compiler.source>
    <maven.compiler.target>1.8maven.compiler.target>

    <maven-compiler-plugin.version>3.8.1maven-compiler-plugin.version>
    <maven-shade-plugin.version>3.2.4maven-shade-plugin.version>
    <maven-surefire-plugin.version>2.22.2maven-surefire-plugin.version>
    <exec-maven-plugin.version>3.0.0exec-maven-plugin.version>

    <vertx.version>4.4.4vertx.version>
    <junit-jupiter.version>5.9.1junit-jupiter.version>
    <logback.version>1.2.3logback.version>
    <jackson.version>2.11.3jackson.version>
    <main.verticle>com.whty.mongodemo.MainVerticlemain.verticle>
    <launcher.class>io.vertx.core.Launcherlauncher.class>
  properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>io.vertxgroupId>
        <artifactId>vertx-stack-depchainartifactId>
        <version>${vertx.version}version>
        <type>pomtype>
        <scope>importscope>
      dependency>
    dependencies>
  dependencyManagement>

  <dependencies>
    <dependency>
      <groupId>io.vertxgroupId>
      <artifactId>vertx-configartifactId>
    dependency>
    <dependency>
      <groupId>io.vertxgroupId>
      <artifactId>vertx-webartifactId>
    dependency>
    <dependency>
      <groupId>io.vertxgroupId>
      <artifactId>vertx-mongo-clientartifactId>
    dependency>
    <dependency>
      <groupId>ch.qos.logbackgroupId>
      <artifactId>logback-classicartifactId>
      <version>${logback.version}version>
    dependency>

    <dependency>
      <groupId>io.vertxgroupId>
      <artifactId>vertx-junit5artifactId>
      <scope>testscope>
    dependency>
    <dependency>
      <groupId>org.junit.jupitergroupId>
      <artifactId>junit-jupiter-apiartifactId>
      <version>${junit-jupiter.version}version>
      <scope>testscope>
    dependency>
    <dependency>
      <groupId>org.junit.jupitergroupId>
      <artifactId>junit-jupiter-engineartifactId>
      <version>${junit-jupiter.version}version>
      <scope>testscope>
    dependency>
    <dependency>
      <groupId>org.projectlombokgroupId>
      <artifactId>lombokartifactId>
      <version>1.18.24version>
    dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.coregroupId>
      <artifactId>jackson-databindartifactId>
      <version>${jackson.version}version>
    dependency>
  dependencies>

二、代码编写

熟悉Vert.x的同学应该都知道，其基本单元是Verticle，本demo中包含三个Verticle，分别是MainVerticle、MongoVerticle、HttpServerVerticle，MainVerticle是程序的入口，在其中依次发布另外两个Verticle。

1.MongoDB连接

在MongoVerticle中，我们主要是建立MongoDB连接和添加EventBus监听。

import io.vertx.core.AbstractVerticle;

public class MongoVerticle extends AbstractVerticle {

  @Override
  public void start() {
    new MongoListener(vertx.eventBus(), new MongoClientFactory(vertx).getInstance());
  }
}

MongoDB的连接建立非常简单，我们通过一个工厂类去创建一个连接。

public class MongoClientFactory {

  private final MongoClient client;

  public MongoClientFactory(Vertx vertx) {
    JsonObject config = new JsonObject()
      .put("db_name", "demo")
      .put("host", "127.0.0.1")
      .put("port", 27017)
      .put("username", "demo")
      .put("password", "demo123")
      .put("authSource", "demo")
      .put("useObjectId", true);
    this.client = MongoClient.createShared(vertx, config);
  }

  public MongoClient getInstance() {
    return this.client;
  }
}

需要注意的是数据库的配置，useObjectId表示插入数据时如果无_id则自动生成ObjectId，ObjectId在JSON显示如下

{"_id":{"$oid":"xxxxxxxxxxxxxxxxxxxxx"}}

如果将useObjectId设置为true则在后续API中会自动转换为

{"_id":"xxxxxxxxxxxxxxxxxx"}

useObjectId默认设置为false将会使用普通字符串id。

2.通用CRUD

vertx-mongo-client中的API非常丰富，详细可以参考官方文档，本demo中仅列举基本CRUD操作。

import com.whty.mongodemo.constant.EventBusAddress;
import com.whty.mongodemo.constant.ParamKey;
import com.whty.mongodemo.util.DateUtil;
import io.vertx.core.Future;
import io.vertx.core.eventbus.EventBus;
import io.vertx.core.json.JsonArray;
import io.vertx.core.json.JsonObject;
import io.vertx.ext.mongo.FindOptions;
import io.vertx.ext.mongo.MongoClient;
import io.vertx.ext.mongo.MongoClientDeleteResult;
import io.vertx.ext.mongo.UpdateOptions;
import io.vertx.ext.mongo.impl.codec.json.JsonObjectCodec;
import lombok.extern.slf4j.Slf4j;
import java.util.List;


@Slf4j
public class MongoListener {

  private final EventBus eventBus;

  private final MongoClient client;

  public MongoListener(EventBus eventBus, MongoClient client) {
    this.eventBus = eventBus;
    this.client = client;
    this.addConsumer();
  }

  private void addConsumer() {
    this.queryById();
    this.query();
    this.insert();
    this.remove();
    this.update();
    this.queryByPage();
    this.queryWithLookup();
  }

  private void queryById() {
    eventBus.localConsumer(EventBusAddress.QUERY_BY_ID, message -> {
      JsonObject body = (JsonObject) message.body();
      String collection = body.getString(ParamKey.COLLECTION);
      JsonObject query = body.getJsonObject(ParamKey.QUERY);
      client.find(collection, query, ar -> {
        if (ar.succeeded()) {
          List<JsonObject> list = ar.result();
          if (list != null && list.size() > 0) {
            JsonObject result = list.get(0);
            message.reply(this.handleDate(result));
          } else {
            message.reply(null);
          }
        } else {
          log.error(ar.cause().getMessage(), ar.cause());
          message.reply(ar.cause());
        }
      });
    });
  }

  private void query() {
    eventBus.localConsumer(EventBusAddress.QUERY, message -> {
      JsonObject body = (JsonObject) message.body();
      String collection = body.getString(ParamKey.COLLECTION);
      JsonObject query = body.getJsonObject(ParamKey.QUERY);
      client.find(collection, query, ar -> {
        if (ar.succeeded()) {
          List<JsonObject> list = ar.result();
          if (list != null && list.size() > 0) {
            list.forEach(this::handleDate);
            message.reply(new JsonArray(list));
          } else {
            message.reply(new JsonArray());
          }
        } else {
          log.error(ar.cause().getMessage(), ar.cause());
          message.reply(ar.cause());
        }
      });
    });
  }

  private void queryByPage() {
    eventBus.localConsumer(EventBusAddress.QUERY_BY_PAGE, message -> {
      JsonObject body = (JsonObject) message.body();
      String collection = body.getString(ParamKey.COLLECTION);
      JsonObject query = body.getJsonObject(ParamKey.QUERY);
      JsonObject pageParams = body.getJsonObject(ParamKey.PAGE);
      Integer pageSIze = pageParams.getInteger(ParamKey.PAGE_SIZE);
      Integer pageNum = pageParams.getInteger(ParamKey.PAGE_NUM);
      JsonObject sort = pageParams.getJsonObject(ParamKey.SORT);
      FindOptions findOptions = new FindOptions()
        .setSort(sort)
        .setLimit(pageSIze)
        .setSkip((pageNum - 1) * pageSIze);
      Future<Long> countFuture = client.count(collection, query);
      Future<List<JsonObject>> dataFuture = client.findWithOptions(collection, query, findOptions);
      Future.all(countFuture, dataFuture).onSuccess(ar -> {
        Long count = ar.resultAt(0);
        List<JsonObject> list = ar.resultAt(1);
        if (list != null && list.size() > 0) {
          list.forEach(this::handleDate);
        }
        JsonObject result = new JsonObject()
          .put(ParamKey.PAGE_SIZE, pageSIze)
          .put(ParamKey.PAGE_NUM, pageNum)
          .put("total", count)
          .put("list", list != null && list.size() > 0 ? list : new JsonArray());
        message.reply(result);
      }).onFailure(e -> {
        log.error(e.getMessage(), e);
        message.reply(e);
      });
    });
  }

  private void insert() {
    eventBus.localConsumer(EventBusAddress.INSERT, message -> {
      JsonObject body = (JsonObject) message.body();
      String collection = body.getString(ParamKey.COLLECTION);
      JsonObject query = body.getJsonObject(ParamKey.QUERY);
      query.put("createTime", new JsonObject().put("$date", DateUtil.getUTCTime()));
      try {
        client.insert(collection, query, ar -> {
          if (ar.succeeded()) {
            String id = ar.result();
            message.reply(new JsonObject().put("_id", id));
          } else {
            log.error("存储数据异常：{}", ar.cause().getMessage(), ar.cause());
            message.reply(ar.cause());
          }
        });
      } catch (Exception e) {
        log.error("存储数据异常：{}", e.getMessage(), e);
        message.reply(e);
      }
    });
  }

  private void update() {
    eventBus.localConsumer(EventBusAddress.UPDATE, message -> {
      JsonObject body = (JsonObject) message.body();
      String collection = body.getString(ParamKey.COLLECTION);
      JsonObject query = body.getJsonObject(ParamKey.QUERY);
      JsonObject data = body.getJsonObject("data");
      data.put("updateTime", new JsonObject().put("$date", DateUtil.getUTCTime()));
      JsonObject update = new JsonObject().put("$set", data);
      //multi set to true to update multiple documents
      client.updateCollectionWithOptions(collection, query, update,
        new UpdateOptions().setMulti(body.containsKey("multi")),
        ar -> {
          if (ar.succeeded()) {
            message.reply(ar.result().toJson());
          } else {
            log.error(ar.cause().getMessage(), ar.cause());
            message.reply(ar.cause());
          }
        });
    });
  }

  private void remove() {
    eventBus.localConsumer(EventBusAddress.REMOVE, message -> {
      JsonObject body = (JsonObject) message.body();
      String collection = body.getString(ParamKey.COLLECTION);
      JsonObject query = body.getJsonObject(ParamKey.QUERY);
      Future<MongoClientDeleteResult> future;
      if (body.containsKey(ParamKey.SINGLE)) { //仅删除匹配的第一条数据
        future = client.removeDocument(collection, query);
      } else {
        future = client.removeDocuments(collection, query);
      }
      future.andThen(ar -> {
        if (ar.succeeded()) {
          message.reply(ar.result().toJson());
        } else {
          log.error(ar.cause().getMessage(), ar.cause());
          message.reply(ar.cause());
        }
      });
    });
  }

  private void queryWithLookup() {
    eventBus.localConsumer(EventBusAddress.QUERY_WITH_LOOKUP, message -> {
      JsonObject body = (JsonObject) message.body();
      String collection = body.getString(ParamKey.COLLECTION);
      JsonObject query = body.getJsonObject(ParamKey.QUERY);
      JsonArray pipeline = new JsonArray();
      JsonObject lookup = new JsonObject()
        .put("$lookup", body.getJsonObject("lookup"));
      pipeline.add(lookup);
      if (null != query) {
        pipeline.add(new JsonObject().put("$match", query));
      }
      JsonArray resultArr = new JsonArray();
      client.aggregate(collection, pipeline)
        .handler(resultArr::add)
        .endHandler(v ->
          message.reply(resultArr)
        ).exceptionHandler(e -> {
          log.error(e.getMessage(), e);
          message.reply(e);
        });
    });

  }

  private JsonObject handleDate(JsonObject json) {
    return this.decodeDateKey(this.decodeDateKey(json, "createTime"), "updateTime");
  }

  private JsonObject decodeDateKey(JsonObject json, String key) {
    Object timeField = json.getValue(key, null);
    if (!(timeField instanceof JsonObject)) return json;
    Object timeString = ((JsonObject) timeField).getValue(JsonObjectCodec.DATE_FIELD, null);
    if (!(timeString instanceof String)) return json;
    json.put(key, DateUtil.formatOffsetDateTime((String) timeString));
    return json;
  }
}

Vert.x的Verticle之间主要通过EventBus进行通信，在这里我们创建了MongoDB的通用CRUD监听，而发送消息的一段则在后面的HttpServerVerticle中创建。

可以看到每一个API都会用到collection参数，collection集合就相当于SQL数据库的表，这里collection参数表示表名称，通过传递不同的表名称来对不同的表进行CRUD。

$lookup是MongoDB中的高阶查询方法，可以实现类似SQL数据库中的联表功能，具体用法可以参考这篇文章。

3.HTTP服务

import com.whty.mongodemo.route.CustomForm;
import com.whty.mongodemo.route.FormData;
import io.vertx.core.AbstractVerticle;
import io.vertx.core.http.HttpServer;
import io.vertx.ext.web.Router;
import io.vertx.ext.web.handler.BodyHandler;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class HttpServerVerticle extends AbstractVerticle {

  private final int port = 8080;

  @Override
  public void start() {
    HttpServer server = vertx.createHttpServer();

    Router router = Router.router(vertx);

    router.route().handler(BodyHandler.create());
    //注册路由
    this.registerRoute(router);
    server.requestHandler(router).listen(port, ar -> {
      if (ar.succeeded()) {
        log.info("web服务启动成功，监听端口{}", port);
      } else {
        log.error("web服务启动失败");
      }
    });
  }

  private void registerRoute(Router router) {
    new CustomForm().init(router);
    new FormData().init(router);
  }
}

在这个Verticle中，我们创建了HttpServer并注册了路由，我们演示的集合有两个分别是custom_form和form_data，一个用于存储自定义表单结构，另一个存储表单填写的数据，这两个集合的业务路由分别由两个类管理。

import com.whty.mongodemo.handler.CustomFormHandler;
import io.vertx.ext.web.Router;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class CustomForm {

  private final CustomFormHandler handler = new CustomFormHandler();

  private final static String prefix = "/customForm";

  public void init(Router router) {
    router.get(prefix + "/queryById/:id").handler(handler.queryById());
    router.post(prefix + "/query").handler(handler.query());
    router.post(prefix + "/queryByPage").handler(handler.queryByPage());
    router.post(prefix + "/insert").handler(handler.insert());
    router.put(prefix + "/update").handler(handler.update());
    router.delete(prefix + "/remove/:id").handler(handler.remove());
    router.post(prefix + "/queryWithChildren").handler(handler.queryWithChildren());
  }
}

为了传参方便，查询列表和分页查询也使用的是post方法，不太符合REST规范建议好孩子不要学习。下面继续看handler中的代码

import com.whty.mongodemo.constant.ParamKey;
import com.whty.mongodemo.service.CustomFormService;
import io.vertx.core.Handler;
import io.vertx.core.json.JsonObject;
import io.vertx.ext.web.RoutingContext;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class CustomFormHandler extends BaseRoutingHandler {

  private final CustomFormService service = new CustomFormService("form_schema");

  public Handler<RoutingContext> queryById() {
    return ctx -> service.queryById(ctx.pathParam("id"), this.commonReplyHandler(ctx.response()));
  }

  public Handler<RoutingContext> query() {
    return ctx -> service.query(ctx.body() != null ? ctx.body().asJsonObject() : null, this.commonReplyHandler(ctx.response()));
  }

  public Handler<RoutingContext> queryByPage() {
    return ctx -> {
      JsonObject queryParams = ctx.body().asJsonObject();
      JsonObject page = new JsonObject().put(ParamKey.PAGE_NUM, 1).put(ParamKey.PAGE_SIZE, 10);
      JsonObject query = new JsonObject();
      if (null != queryParams) {
        queryParams.forEach(entry -> {
          String k = entry.getKey();
          Object v = entry.getValue();
          if (k.equals(ParamKey.PAGE_NUM)) {
            page.put(ParamKey.PAGE_NUM, v);
          } else if (k.equals(ParamKey.PAGE_SIZE)) {
            page.put(ParamKey.PAGE_SIZE, v);
          } else {
            if ("formRef".equals(k)) { //模糊查询
              query.put(k, new JsonObject().put("$regex", v));
            } else {
              query.put(k, v);
            }
          }
        });
      }
      service.queryByPage(page, query, this.commonReplyHandler(ctx.response()));
    };
  }

  public Handler<RoutingContext> queryWithChildren() {
    return ctx -> {
      JsonObject lookup = new JsonObject()
        .put("from", "form_component")
        .put("localField", "component_id")
        .put("foreignField", "_id")
        .put("as", "component_info");
      service.queryWithLookup(lookup, ctx.body().asJsonObject(), this.commonReplyHandler(ctx.response()));
    };
  }

  public Handler<RoutingContext> insert() {
    return ctx -> {
      JsonObject query = ctx.body().asJsonObject();
      service.insert(query, this.commonReplyHandler(ctx.response()));
    };
  }


  public Handler<RoutingContext> update() {
    return ctx -> {
      JsonObject bodyData = ctx.body().asJsonObject();
      String id = bodyData.getString("_id");
      bodyData.remove("_id");
      service.updateById(id, bodyData, this.commonReplyHandler(ctx.response()));
    };
  }

  public Handler<RoutingContext> remove() {
    return ctx -> service.removeById(ctx.pathParam("id"), this.commonReplyHandler(ctx.response()));
  }
}

每个业务handler都会继承BaseRoutingHandler，其中包含一些通用方法

import com.whty.mongodemo.model.JsonResult;
import io.vertx.core.AsyncResult;
import io.vertx.core.Handler;
import io.vertx.core.eventbus.Message;
import io.vertx.core.http.HttpHeaders;
import io.vertx.core.http.HttpServerResponse;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class BaseRoutingHandler {

  public void endJson(HttpServerResponse response, JsonResult jsonResult) {
    response.putHeader(HttpHeaders.CONTENT_TYPE, "application/json; charset=utf-8");
    response.end(jsonResult.encodePrettily());
  }

  public void endJson(HttpServerResponse response) {
    response.putHeader(HttpHeaders.CONTENT_TYPE, "application/json; charset=utf-8");
    response.end();
  }

  public Handler<AsyncResult<Message<Object>>> commonReplyHandler(HttpServerResponse response) {
    return ar -> {
      if (ar.succeeded()) {
        if (null != ar.result().body() && ar.result().body() instanceof Throwable) {
          this.endJson(response, JsonResult.failed());
        } else {
          this.endJson(response, JsonResult.success(ar.result().body()));
        }
      } else {
        log.error(ar.cause().getMessage(), ar.cause());
        this.endJson(response, JsonResult.failed());
      }
    };
  }
}

form_data表相关的代码与以上代码非常相似就不贴了。可以看到整个项目都是JSON直通到底没有使用实体类，这也是为了演示MongoDB库数据结构灵活的特点，在实际生产中，还是建议规范定义schema，创建实体类传参，避免数据混乱。

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总结

以上就是Vert.x操作MongoDB的示例代码，对Vert.x感兴趣的同学可以看看本人其他相关文章，下面是本项目源码，可以顺手点个STAR。
源码下载