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netdiscovery's Introduction

NetDiscovery

@Tony沈哲 on weibo License

最新版本

模块名 最新版本
netdiscovery-core Download
netdiscovery-extra Download
netdiscovery-selenium Download
netdiscovery-dsl Download
netdiscovery-coroutines Download

NetDiscover 主要是基于 Vert.x、RxJava 2 等框架实现的爬虫框架。目前还处于早期的版本,很多细节正在不断地完善中。

对于 Java 工程,如果使用 gradle 构建,由于默认没有使用 jcenter(),需要在相应 module 的 build.gradle 中配置

repositories {
    mavenCentral()
    jcenter()
}

下载:

netdiscovery-core

implementation 'com.cv4j.netdiscovery:netdiscovery-core:0.2.5'

netdiscovery-extra

implementation 'com.cv4j.netdiscovery:netdiscovery-extra:0.2.5'

netdiscovery-selenium

implementation 'com.cv4j.netdiscovery:netdiscovery-selenium:0.2.5'

netdiscovery-dsl

implementation 'com.cv4j.netdiscovery:netdiscovery-dsl:0.0.5'

netdiscovery-coroutines

implementation 'com.cv4j.netdiscovery:netdiscovery-coroutines:0.0.5'

NetDiscovery 功能点:

1.Spider功能

Spider可以单独使用,也可以添加到SpiderEngine中使用。

Spider中内置了很多组件。例如downloader就已经支持了好几种,支持热插拔随时替换,或者编写自己的downloader。

queue、parser、pipeline也都类似。其中,支持多个pipeline按照顺序执行。

在调试的时候,可以使用ConsolePipeline或者DebugPipeline

DebugPipeline打印的日志效果如下

2.SpiderEngine功能

SpiderEngine可以管理引擎中的爬虫,包括爬虫的生命周期。

2.1 获取某个爬虫的状态

http://localhost:{port}/netdiscovery/spider/{spiderName}

类型:GET

2.2 获取SpiderEngine中所有爬虫的状态

http://localhost:{port}/netdiscovery/spiders/

类型:GET

2.3 修改某个爬虫的状态

http://localhost:{port}/netdiscovery/spider/{spiderName}/status

类型:POST

参数说明:

{
    "status":2   //让爬虫暂停
}
status 作用
2 让爬虫暂停
3 让爬虫从暂停中恢复
4 让爬虫停止

3. DSL 模块

使用 DSL 来创建一个爬虫并运行:

        val spider = spider {

            name = "tony"

            urls = listOf("http://www.163.com/","https://www.baidu.com/")

            pipelines = setOf(ConsolePipeline())
        }

        spider.run()

它等价于下面的java代码

        Spider.create().name("tony1")
                .url("http://www.163.com/", "https://www.baidu.com/")
                .pipeline(new ConsolePipeline())
                .run();

还可以使用 DSL 来创建 SpiderEngine:

        val spiderEngine = spiderEngine {

            port = 7070
        }

        val spider1 = spider {

            name = "tony1"
        }

        spider1.repeatRequest(10000,"http://www.163.com")
                .initialDelay(10000)

        spiderEngine.addSpider(spider1)

        spiderEngine.addSpider(spider {

            name = "tony2"
            urls = listOf("https://www.baidu.com")
        })

        spiderEngine.runWithRepeat()

NetDiscovery 基本原理:

1.基本原理

2.集群原理

案例:

  • user-agent-list:抓取常用浏览器的user agent
  • 在“Java与Android技术栈”公众号回复数字货币的关键字,获取最新的价格

Todo List:

  1. 增加 RabbitMQ 的支持
  2. 增加 Cooikes Pool
  3. 增加 elasticsearch 的支持
  4. 整合cv4j以及 Tesseract,实现 OCR 识别的功能

联系方式:

QQ交流群:490882934

Java与Android技术栈:每周更新推送原创技术文章,欢迎扫描下方的公众号二维码并关注,期待与您的共同成长和进步。

License

Copyright (C) 2017 Tony Shen.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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