对于OpenResty的使用，本章介绍一下文件上传。代码如下：
local upload = require "resty.upload" local cjson = require "cjson" local result = require "common.result" local uuid = require 'resty.uuid' local configCache = ngx.shared.configCache; local _M = {} -- 文件上传 function _M.file() local args = ngx.req.get_uri_args() local realFileName = uuid:generate() local chunk_size = 4096 local form, err = upload:new(chunk_size) if not form then ngx.log(ngx.ERR, "failed to new upload: ", err) ngx.say(cjson.encode(result:error('failed to new upload'))) return end form:set_timeout(1000) -- 字符串 split 分割 string.split = function(s, p) local rt= {} string.gsub(s, '[^'..p..']+', function(w) table.insert(rt, w) end ) return rt end -- 支持字符串前后 trim string.trim = function(s) return (s:gsub("^%s*(.-)%s*$", "%1")) end -- 保存根路径 local saveRootPath = configCache:get('projectPath') .. "/images/" -- 文件对象 local fileToSave -- 是否成功保存 local ret_save = false while true do local typ, res, err = form:read() if not typ then ngx.say("failed to read: ", err) return end if typ == "header" then -- 读取header local key = res[1] local value = res[2] if key == "Content-Disposition" then -- 解析上传的文件名 -- form-data; name="testFileName"; filename="testfile.txt" local kvlist = string.split(value, ';') for _, kv in ipairs(kvlist) do local seg = string.trim(kv) if seg:find("filename") then local kvfile = string.split(seg, "=") local filename = string.sub(kvfile[2], 2, -2) if filename then realFileName = realFileName .. '.' .. filename:match(".+%.(%w+)$") fileToSave = io.open(saveRootPath .. realFileName, "w+") if not fileToSave then ngx.say("failed to open file ", filename) return end break end end end end elseif typ == "body" then -- 读取 body if fileToSave then fileToSave:write(res) end elseif typ == "part_end" then -- 写结束 关闭文件 if fileToSave then fileToSave:close() fileToSave = nil end ret_save = true elseif typ == "eof" then -- 读取结束 break else -- do things end end ngx.say(cjson.encode(result:success("save file ok"))) end return _M lua-resty-upload支持类型为multipart/form-data的MIME类型。当连接建立后，循环调用form:read()会返回4种http请求片断：header、body、part_end、eof。每次token返回的数据是一个数组，以header、body、part_end或者eof开头，如下所示： read: ["header",["Content-Disposition","form-data; name=\"file1\"; filename=\"a.txt\"","Content-Disposition: form-data; name=\"file1\"; filename=\"a.txt\""]] read: ["header",["Content-Type","text\/plain","Content-Type: text\/plain"]] read: ["body","Hello"] read: ["body",", wor"] read: ["body","ld"] read: ["part_end"] read: ["header",["Content-Disposition","form-data; name=\"test\"","Content-Disposition: form-data; name=\"test\""]] read: ["body","value"] read: ["body","\r\n"] read: ["part_end"] read: ["eof"] read: ["eof"] 上述demo主要参见官方文档： https://github.com/openresty/lua-resty-upload 还有一点需要注意的是，上面用到了 lua-resty-uuid对上传文件进行重命名（ 非OpenResty官方提供）。下载uuid.lua文件，直接粘贴到OpenResty安装目录lualib.resty文件夹下即可。链接：http://moguhu.com/article/detail?articleId=19
