Golang 谷歌搜索api 实现搜索引擎(前端 bootstrap + jquery)
体验 冒号搜索
1. 获取谷歌搜索api
2. 后台调用
程序入口 main.go
// goSearch project main.go
package main
import (
"fmt"
"net/http"
)
func main() {
Api()
ReadApi("./api.txt")
go TimeTo()
http.HandleFunc("/", Home)
http.HandleFunc("/search", Search)
http.Handle("/static", http.FileServer(http.Dir("./static")))
fmt.Print("server is running
")
http.ListenAndServe(":80", nil)
}
处理函数 route.go
// route
package main
import (
"fmt"
"io"
"net/http"
"strconv"
)
func Home(w http.ResponseWriter, r *http.Request) {
fmt.Println("go")
fmt.Println(GetBest())
w.Write([]byte("hi"))
}
func Search(w http.ResponseWriter, r *http.Request) {
url := "https://www.googleapis.com/customsearch/v1?cx=项目id&safe=是否开启安全模式（active）&key=" + GetBest()
r.ParseForm()
q := r.Form["q"][0]
var p string
var t string
if r.Form["p"] != nil {
p = r.Form["p"][0]
} else {
p = ""
}
if r.Form["t"] != nil {
t = r.Form["t"][0]
} else {
t = ""
}
if q == "" {
w.Write([]byte("null"))
return
} else {
url = url + "&q=" + q
}
if p == "" {
p = "1"
} else {
i, _ := strconv.Atoi(p)
p = strconv.Itoa(i*10 + 1)
}
url = url + "&start=" + p
if t != "" {
url = url + "&siteSearch=" + t
}
fmt.Println("q= ", q, " p= ", p, " t= ", t)
client := http.Client{}
resp, err := client.Get(url)
if err != nil {
fmt.Println(err.Error())
return
}
defer resp.Body.Close()
w.Header().Set("Access-Control-Allow-Origin", "*")
io.Copy(w, resp.Body)
}
多个api 获取使用次数最少api，从文件获取apis
api.go
// api
package main
import (
"bufio"
"errors"
"fmt"
"os"
"time"
)
type SeaApi struct {
apis []api
time time.Time
}
type api struct {
apiCode string
count int
}
var apii *SeaApi
//初始化
func Api() {
apii = &SeaApi{time: time.Now()}
}
func NewApi() *SeaApi {
return &SeaApi{time: time.Now()}
}
//添加api
func AddApi(a string) {
newApi := api{a, 0}
apii.apis = append(apii.apis, newApi)
}
func (s *SeaApi) AddApi(a string) {
newApi := api{a, 0}
s.apis = append(s.apis, newApi)
}
//删除指定api
func DelApi(n int) {
apii.apis = append(apii.apis[:n], apii.apis[n+1:]...)
}
func (s *SeaApi) DelApi(n int) {
s.apis = append(s.apis[:n], s.apis[n+1:]...)
}
//获取指定api
func GetApi(n int) (api, error) {
if n > len(apii.apis) {
return api{}, errors.New("fault index")
}
return apii.apis[n], nil
}
func (s *SeaApi) GetApi(n int) (api, error) {
if n > len(s.apis) {
return api{}, errors.New("fault index")
}
return s.apis[n], nil
}
//获取所有api
func GetAllApi() *SeaApi {
return apii
}
func (s *SeaApi) GetAllApi() *SeaApi {
return s
}
//从文件读取api，每行一个，文件名api.txt
func ReadApi(file string) interface{} {
f, err := os.Open(file)
if err != nil {
fmt.Print(err.Error())
return nil
}
defer f.Close()
Clear()
scan := bufio.NewScanner(f)
count := 0
for scan.Scan() {
str := scan.Text()
apii.AddApi(str)
count = count + 1
}
return count
}
func (s *SeaApi) ReadApi(file string) interface{} {
f, err := os.Open(file)
if err != nil {
fmt.Print(err.Error())
return nil
}
defer f.Close()
Clear()
scan := bufio.NewScanner(f)
count := 0
for scan.Scan() {
str := scan.Text()
s.AddApi(str)
count = count + 1
}
return count
}
//清理所有api
func Clear() {
apii.apis = apii.apis[0:0]
}
func (s *SeaApi) Clear() {
s.apis = s.apis[0:0]
}
func TimeTo() {
for {
time.Sleep(time.Duration(1) * time.Hour)
now := time.Now()
if now.Sub(apii.time).Hours() > 24 {
apii.time = now
for _, a := range apii.apis {
a.count = 0
}
}
}
}
//轮询，满24小时更新使用次数为0
func (s *SeaApi) TimeTo() {
for {
time.Sleep(time.Duration(1) * time.Hour)
now := time.Now()
if now.Sub(s.time).Hours() > 24 {
s.time = now
for _, a := range s.apis {
a.count = 0
}
}
}
}
func GetBest() string {
n := 0
for i, a := range apii.apis {
if apii.apis[n].count >= a.count {
n = i
}
}
apii.apis[n].count = apii.apis[n].count + 1
return apii.apis[n].apiCode
}
//获取使用次数最少的api
func (s *SeaApi) GetBest() string {
n := 0
for i, a := range s.apis {
if s.apis[n].count >= a.count {
n = i
}
}
s.apis[n].count = s.apis[n].count + 1
return s.apis[n].apiCode
}
3. 前端页面
html可以自己设计
主要js代码：
index.js
$(document).ready(function () {
//文本输入框监听
$("#text").keydown(function (e) {
var curKey = e.which;
if (curKey == 13) {
$("#go").click();
return false;
}
});
//搜索按钮监听
$("#go").click(function () {
var str = $("#text").val();
console.log(str);
if (str != '') window.location.href = 'search.html?q=' + str;
});
//判断是否是手机端
function IsMobile() {
var isMobile = {
Android: function () {
return navigator.userAgent.match(/Android/i) ? true : false;
},
BlackBerry: function () {
return navigator.userAgent.match(/BlackBerry/i) ? true : false;
},
iOS: function () {
return navigator.userAgent.match(/iPhone|iPad|iPod/i) ? true : false;
},
Windows: function () {
return navigator.userAgent.match(/IEMobile/i) ? true : false;
},
any: function () {
return (isMobile.Android() || isMobile.BlackBerry() || isMobile.iOS() || isMobile.Windows());
}
};
return isMobile.any(); //是移动设备
}
var mobile_flag = IsMobile();
if (mobile_flag) {
$("#mho").attr("style","font-size: 3em;");
$("#pc1").hide();
}
})search.js
$(document).ready(function () {
var str = GetUrlPara();
var nowPage = 0;
$("#up").hide();
$("#down").hide();
//获取请求参数
function GetUrlPara() {
var url = document.location.toString();
var arrUrl = url.split("?");
var para = arrUrl[1];
para = para.split("&");
var p0 = para[0].split("=");
return p0[1];
}
//ajax获取搜索值
function Search(query, page, type) {
query = decodeURIComponent(query);
var urls = "后台服务器ip或域名/search?q=" + query + "&p=" + page + "&t=" + type;
$("#tit").html("冒号--> " + decodeURIComponent(query));
$("#text").attr("value", decodeURIComponent(query));
urls = urls.replace(/[ ]/g,'_');
console.log(urls);
$.ajax({
type: "GET",
url: urls,
dataType: "json",
success: function (data) {
$("#loading").hide();
var str1 = '<div class="row"><div class="panel panel-default"><div class="panel-body"><p><h3><a href="';
var str2 = '">';
var str3 = '</a></h3></p><p>';
var str4 = '</p><p><a href="';
var str5 = '">';
var str6 = '</a></p></div></div></div>';
var all = '';
for (var j = 0; j < data["items"].length; j++) {
all = all + str1 + data["items"][j]["link"] + str2 + data["items"][j]["title"] + str3 + data["items"][j]["snippet"] + str4 + data["items"][j]["link"] + str5 + data["items"][j]["displayLink"] + str6;
}
$("#cont").html(all);
if (data["queries"]["nextPage"] != null) {
$("#down").show();
} else {
$("#down").hide();
}
if (nowPage != 0) {
$("#up").show();
} else {
$("#up").hide();
}
}
});
}
Search(str, 0, "");
$("#text").keydown(function (e) {
var curKey = e.which;
if (curKey == 13) {
$("#go").click();
return false;
}
});
$("#go").click(function () {
var strText = $("#text").val();
if (strText == "") {
window.location.href = 'index.html';
}
else {
window.location.href = 'search.html?q=' + strText;
}
//Search(strText,0,"");
});
$("#logo").click(function () {
window.location.href = 'index.html';
});
//回到顶部
function pageScroll() {
$('html,body').animate({
scrollTop: 0
}, 1000);
}
$("#up").click(function () {
$("#loading").show();
nowPage--;
Search(str, nowPage, "");
pageScroll();
});
$("#down").click(function () {
$("#loading").show();
nowPage++;
Search(str, nowPage, "");
pageScroll();
});
function IsMobile() {
var isMobile = {
Android: function () {
return navigator.userAgent.match(/Android/i) ? true : false;
},
BlackBerry: function () {
return navigator.userAgent.match(/BlackBerry/i) ? true : false;
},
iOS: function () {
return navigator.userAgent.match(/iPhone|iPad|iPod/i) ? true : false;
},
Windows: function () {
return navigator.userAgent.match(/IEMobile/i) ? true : false;
},
any: function () {
return (isMobile.Android() || isMobile.BlackBerry() || isMobile.iOS() || isMobile.Windows());
}
};
return isMobile.any(); //是移动设备
}
var mobile_flag = IsMobile();
if (mobile_flag) {
$("#mho").attr("style", "font-size: 2em;text-align: center;");
}
})4. 程序上线
我将html、js托管在coding pages上，go程序发布到美国服务器ubuntu18上，服务器开启了bbr加速，域名全部使用cloudflare，并开启了cdn功能（有缓存，调试的话先关了）。
小结
golang程序的编写，使用了许多go官方库，也踩了许多坑，但是对go 的库使用更加熟练。前端页面的编写主要用bootstrap和jquery框架，开发速度快很多，相较于以前，对这两个框架使用更加灵活，官方文档认真的看下来会发现以前没认真看真的走了好多弯路。
效果图
