从0开始学golang--2.2--如何去爬园子的数据👉进阶篇，面向对象的单任务版

时间：2019-04-15 20:42:17 阅读：278 评论：0 收藏：0 [点我收藏+]

执行页-----------------------------------代码??----------------------------------

package main

import (
    "../sole/cnblogs/parserabc"
    "../sole/engine"
)

func main() {
    engine.Run(engine.Request{
        //Url:        "http://www.zhenai.com/zhenghun",
        ParserFunc: parserabc.ParseCategory,
        Url:        "https://www.cnblogs.com/",
    })
}

engine页1----run代码块-----------------------------------代码??----------------------------------

package engine

import (
    "log"

    "../fetcher"
)

func Run(seeds ...Request) {
    var requests []Request
    for _, r := range seeds {
        requests = append(requests, r)
    }
    for len(requests) > 0 {
        r := requests[0]
        requests = requests[1:]

        log.Printf("Fetching %s", r.Url)

        body, err := fetcher.Fetch(r.Url)
        if err != nil {
            log.Printf("Fetch:error"+
                "fetching url %s:%v",
                r.Url, err)
            continue
        }
        ParseResult := r.ParserFunc(body)
        requests = append(requests,
            ParseResult.Requests...)

        for _, item := range ParseResult.Items {
            log.Printf("Got item %v", item)
        }
    }
}

engine页2----处理数据代码块-----------------------------------代码??----------------------------------

package engine

type Request struct {
    Url        string
    ParserFunc func([]byte) ParseResult
}
type ParseResult struct {
    Requests []Request
    Items    []interface{}
}

func NilParser([]byte) ParseResult {
    return ParseResult{}
}

fetcher页1------------提取数据代码块-----------------------------------代码??----------------------------------

package fetcher

import (
    "fmt"
    "io/ioutil"
    "net/http"
)

func Fetch(url string) ([]byte, error) {
    resp, err := http.Get(url)
    if err != nil {
        return nil, err
    }
    defer resp.Body.Close()

    if resp.StatusCode != http.StatusOK {
        return nil,
            fmt.Errorf("wrong status code :%d",
                resp.StatusCode)
    }
    return ioutil.ReadAll(resp.Body)
}

cnblgos页1category------------拉取cnblgos数据代码块-----------------------------------代码??----------------------------------

package main

import (
    "../sole/cnblogs/parser"
    "../sole/engine"
)

func main() {
    engine.Run(engine.Request{
        ParserFunc: parser.ParseCategory,
        Url: "https://www.cnblogs.com/",
    })
}

cnblgos页2------------测试category拉取cnblgos数据代码块-----------------------------------代码??----------------------------------

package parser

import (
    "io/ioutil"
    "testing"
)

func TestParseCategory(t *testing.T) {
    // contents, err := fetcher.Fetch(
    //     "https://www.cnblogs.com/")

    contents, err := ioutil.ReadFile("category_test_data.html")
    if err != nil {
        panic(err)
    }
    //fmt.Printf("%s\n", contents)
    result := ParseCategory(contents)

    const resultSize = 10
    expectedUrls := []string{
        "https://home.cnblogs.com/", "https://q.cnblogs.com/", "https://ing.cnblogs.com/",
    }
    expectedCities := []string{
        "园子", "博问", "闪存",
    }
    if len(result.Requests) != resultSize {
        t.Errorf("resykt should have %d "+
            "requests;but had %d", resultSize, len(result.Requests))
    }
    for i, url := range expectedUrls {
        if result.Requests[i].Url != url {
            t.Errorf("expected url #%d:%s;but"+
                "was %s",
                i, url, result.Requests[i].Url)
        }
    }

    if len(result.Items) != resultSize {
        t.Errorf("resykt should have %d "+
            "requests;but had %d", resultSize, len(result.Items))
    }
    for i, city := range expectedCities {
        if result.Items[i].(string) != city {
            t.Errorf("expected url #%d:%s;but"+
                "was %s",
                i, city, result.Items[i].(string))
        }
    }
}

cnblgos页3category_test_data.html------------category_test.go需要的页面-----------------------------------代码??----------------------------------

Running tool: C:\Go\bin\go.exe test -timeout 30s -run ^(TestParseCategory)$

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从0开始学golang--2.2--如何去爬园子的数据👉进阶篇，面向对象的单任务版

原文：https://www.cnblogs.com/Liang2790912648/p/10712895.html

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