利用go语言内置的各种网络包可以方便的进行web编程。本文章利用了csdn的开放API实现读取最新文章的需求。演示了go语言发起http get请求和json的umarshing特性。

原文：小宇的博客

简单的http GET请求

go语言内置了net/http包，采用http.Get能够方便的发起GET请求

package main

import (
    "fmt"
    "io/IoUtil"
    "log"
    "net/http"
)

func main() {

    resp,err := http.Get("http://api.csdn.net/blog/getnewarticlelist?client_id=????&page=1&size=10")
    if err != nil {
        log.Fatal(err)
    }
    contents,err := IoUtil.ReadAll(resp.Body)
    resp.Body.Close()
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%s",contents)
}

看到返回的内容为json格式。

{"page":1,"count":12733,"size":10,"list":[{"ArticleId":52963517,"BlogId":5022393,"UserName":"u013410747","Title":"linux修改默认的编辑器","Description":"sudo select-editor 选择vim 搞定。。","PostTime":"\/Date(1477712141000)\/","UpdateTime":"\/Date(1477712177908)\/","Digg":0,"Bury":0,"ChannelId":2,"Type":1,"Status":0,"ViewCount":0,"CommentCount":0,"CommentAuth":2,"IsTop":false,"Level":0,"OutlinkCount":0,"Note":null,"IP":null,"Categories":null,"Tags":[],"ColumnAlias":null,"ColumnTitle":null,"MarkDownContent":null,"MarkDownDirectory":null,"ArticleEditType":0,"ArticleMore":null},...umnAlias":null,"ColumnTitle":null,"MarkDownContent":null,"MarkDownDirectory":null,"ArticleEditType":0,"ArticleMore":null}]}成功: 进程退出代码 0. 

JSON转为内部结构体

那么如何把json格式的内容转为golang的内部结构体呢？这需要利用json.Unmarshal

package main

import (
    "encoding/json"
    "fmt"
    "io/IoUtil"
    "log"
    "net/http"
)

type Article struct {
    ArticleId   int
    BlogId      int
    UserName    string
    Title       string
    Description string
    PostTime    string
    UpdateTime  string
    ViewCount    int
    CommentCount int
    Categories  int
    ColumnAlias bool
    Url         string
}
type Articles struct {
    Page  int `json:"page,int"`
    Count int
    Size  int
    List  []*Article
}

func main() {
    resp,err := http.Get("http://api.csdn.net/blog/getnewarticlelist?client_id=????&page=0&size=20")
    if err != nil {
        log.Fatal(err)
    }
    str,err := IoUtil.ReadAll(resp.Body)
    resp.Body.Close()
    if err != nil {
        log.Fatal(err)
    }

    var contents Articles
    if err := json.Unmarshal(str,&contents); err != nil {
        log.Fatal("Json unmarshing Failed: ",err)
    }

    for k,v := range contents.List {
        fmt.Printf("%v. %v\n",k,v.Title)
    }
}

最后，我们完成了用csdn的开放API实现读取最新文章的需求。

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