nginx-openresty-lua使用

以下配置均在/usr/local/openresty/nginx/conf/nginx.conf中配置，涉及到的lua脚本均创建在/usr/local/openresty/nginx/conf

1. localtion下直接写lua脚本：content_by_lua

location /lua {
   default_type text/html; #响应内容为html解析
   content_by_lua 'ngx.say("
hello world ! welcome to openresty!
")'; # content_by_lua：调用lua脚本
           
}

2. 调用lua脚本文件：content_by_lua_file

 location /lua1 {
     default_type text/html; #响应内容为html解析
     content_by_lua_file conf/001.lua; # content_by_lua_file：调用lua脚本
 }

001.lua脚本内容：

ngx.say("
hello world ! welcome to openresty!
")

3. 调用lua脚本文件：include

location /lua2 {
    default_type text/html; #响应内容为html解析
    include lua.conf; # include ：调用lua脚本
}

 lua.conf脚本：

content_by_lua_file conf/002.lua; # content_by_lua_file：调用lua脚本

 002.lua脚本：

ngx.say("
hello world ! welcome to openresty! i am lua2
")

4. 调用lua脚本：content_by_lua_block

location /lua3 {
    default_type text/html; #响应内容为html解析
    content_by_lua_block {
        ngx.say("
hello world ! welcome to openresty! i am content_by_lua_block 
")
    }
}

5. 直接配置在nginx.conf的server下配置：include lua1.conf;

include lua1.conf;

lua1.conf脚本：

location /lua4 {
     default_type text/html; #响应内容为html解析
     content_by_lua_file conf/003.lua;
 }

003.lua脚本：

ngx.say("
hello world ! welcome to openresty! i am lua4
")

6. nginx中uri变量获取

获取单个变量：

location /lua5 {
   default_type text/html; #响应内容为html解析
   content_by_lua_block {
      ngx.say(ngx.var.arg_username) #ngx对象中->变量->参数->_下划线为语法->username为url请求参数名
   }
}

请求：http://10.4.xx.xx/lua5?username=jllasdfasdfsadf

 获取多个变量：

006.lua脚本：

local uri_args = ngx.req.get_uri_args()

for k,v in pairs(uri_args) do
    if type(v) == "table" then
        ngx.say(k," : ",table.concat(v,","),"
")   #table：lua中的表，类似于数组。如：get请求中有多个同名参数不同值的，会通过这个函数来处理
    else
        ngx.say(k," : ",v,"
")
    end
end

 nginx.conf中配置：

 location /lua6 {
     default_type text/html; #响应内容为html解析
     content_by_lua_file conf/006.lua;
}

请求：http://10.4.xx.xx/lua6?username=jll&school=xxSchool&age=18&class=math&class=eglish&class=java

 7. 获取请求头的信息

007.lua脚本：

local headers = ngx.req.get_headers()
ngx.say("Host : ", headers["Host"], "
")
ngx.say("user-agent : ", headers["user-agent"], "
")
ngx.say("user-agent : ", headers.user_agent, "
")
ngx.say("-------------------------------------------","
")
for k,v in pairs(headers) do
    if type(v) == "table" then
        ngx.say(k," : ",table.concat(v,","),"
")
    else
        ngx.say(k," : ",v,"
")
    end
end

 nginx.conf脚本：

location /lua7 {
    default_type text/html; #响应内容为html解析
    content_by_lua_file conf/007.lua;
}

请求：http://10.4.xx.x/lua7