Openresty最佳案例 | 第5篇：http和C_json模块

逃离我推掉我的手 2022-06-05 09:30 142阅读 0赞

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> http://blog.csdn.net/forezp/article/details/78616672  
> 本文出自[方志朋的博客][Link 1]

**个人博客纯净版：[https://www.fangzhipeng.com/openresty/2018/01/01/openresty-best-practice-5-httpclient.html][https_www.fangzhipeng.com_openresty_2018_01_01_openresty-best-practice-5-httpclient.html]**

## http客户端 ##

Openresty没有提供默认的Http客户端，需要下载第三方的http客户端。

下载lua-resty-http到lualib目录下，使用以下的命令下载：

cd /usr/example/lualib/resty/  
    wget https://raw.githubusercontent.com/pintsized/lua-resty-http/master/lib/resty/http_headers.lua  
    
    wget https://raw.githubusercontent.com/pintsized/lua-resty-http/master/lib/resty/http.lua

lua-resty-http模块的地址为https://github.com/pintsized/lua-resty-http

安装成功后，通过require(“resty.http”)引入 lua\_http模块，它有以下的api方法：

*  syntax: httpc = http.new() 创建一个 http对象
 *  syntax: res, err = httpc:request\_uri(uri, params)根据参数获取内容，包括：
    
     *  status 状态码
     *  headers 响应头
     *  body 响应体

vim /usr/example/lua/test\_http.lua，写以下代码：

local http = require("resty.http")  
    
    local httpc = http.new()  
      
    local resp, err = httpc:request_uri("http://s.taobao.com", {  
        method = "GET",  
        path = "/search?q=hello",  
        headers = {  
            ["User-Agent"] = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36"  
        }  
    })  
      
    if not resp then  
        ngx.say("request error :", err)  
        return  
    end  
      
     
    ngx.status = resp.status  
      
      
    for k, v in pairs(resp.headers) do  
        if k ~= "Transfer-Encoding" and k ~= "Connection" then  
            ngx.header[k] = v  
        end  
    end  
      
    ngx.say(resp.body)  
      
    httpc:close()

vim /usr/example/example.conf 加上以下的配置：

location /lua_http {
       default_type 'text/html';
       lua_code_cache on;
       content_by_lua_file /usr/example/lua/test_http.lua;
     }

在Nginx的配置文件nginx.conf的http部分，加上以下dns解析：

vim /usr/servers/nginx/conf/nginx.conf

resolver 8.8.8.8;

浏览器访问：http://116.196.177.123/lua\_http,浏览器会显示淘宝的搜索页。

## lua\_cjson模块 ##

Json是一种常见的数据交换格式，常用于http通信协议和其他数据传输领域。在openresty默认内嵌了lua\_cjson模块，用来序列化数据。

lua\_cjson模块的地址：https://www.kyne.com.au/~mark/software/lua-cjson-manual.html

它常用的API如下：

*  local cjson = require “cjson” 获取一个cjson对象
 *  local str = cjson.encode(obj) obj转换成string
 *  local obj = cjson.decode(str) 将string转obj

vim /usr/example/lua/test\_cjson.lua，添加以下内容：

local cjson = require("cjson") 
 
 
 local obj = { 
 id = 1, 
 name = "zhangsan", 
 age = nil, 
 is_male = false, 
 hobby = {"film", "music", "read"} 
 } 
 
 local str = cjson.encode(obj) 
 ngx.say(str, " ") 
 
 
 str = '{"hobby":["film","music","read"],"is_male":false,"name":"zhangsan","id":1,"age":null}' 
 local obj = cjson.decode(str) 
 
 ngx.say(obj.age, " ") 
 ngx.say(obj.age == nil, " ") 
 ngx.say(obj.age == cjson.null, " ") 
 ngx.say(obj.hobby[1], " ")

vim /usr/example/example.conf添加以下内容：

location ~ /lua_cjson {  
       default_type 'text/html';  
       lua_code_cache on;  
       content_by_lua_file /usr/example/lua/test_cjson.lua;  
     }

在浏览器上访问http://116.196.177.123/lua\_cjson，浏览器显示以下内容：

{"hobby":["film","music","read"],"is_male":false,"name":"zhangsan","id":1}
    null
    false
    true
    film

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[Link 1]: http://blog.csdn.net/forezp
[https_www.fangzhipeng.com_openresty_2018_01_01_openresty-best-practice-5-httpclient.html]: https://www.fangzhipeng.com/openresty/2018/01/01/openresty-best-practice-5-httpclient.html
[SpringCloud]: https://blog.csdn.net/forezp/article/details/70148833
[SpringBoot]: https://blog.csdn.net/forezp/article/details/70341818
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