cocos2d-x lua 使用http(下载图片, POST JSON)

1.使用http post json与服务器交互

require("src/cocos/cocos2d/json")
require("src/cocos/network/NetworkConstants")

-- post json
local xhr = cc.XMLHttpRequest:new()
xhr.responseType = cc.XMLHTTPREQUEST_RESPONSE_JSON
xhr:setRequestHeader("Content-Type", "application/json")
xhr:open("POST", "www.baidu.com")
local function loginCallback()
print("xhr.readyState is:", xhr.readyState, "xhr.status is: ", xhr.status)
if xhr.readyState == 4 and (xhr.status >= 200 and xhr.status < 207) then
local response = xhr.response
local output = json.decode(response)
-- print
table.foreach(output, function(i, v) print (i, v) end)

-- success ...
else
-- fail ...
end
end
xhr:registerScriptHandler(loginCallback)
xhr:send(sendJson)

2.使用http get下载网络图片

local pSprite = nil

pSprite = cc.Sprite:create("tupian.png")
    pSprite:setPosition(cc.p(150, 200))
    ret:addChild(pSprite)

local xhr = cc.XMLHttpRequest:new()

-- tag
xhr._urlFileName = urlFileName
xhr._urlSprite = pSprite

xhr.responseType = cc.XMLHTTPREQUEST_RESPONSE_STRING
xhr:open("GET", "http://cocos2d-x.org/s/images/img-cocos2dx.jpg")
local function onDownloadImage()
print("xhr.readyState is:", xhr.readyState, "xhr.status is: ", xhr.status)
if xhr.readyState == 4 and (xhr.status >= 200 and xhr.status < 207) then
local fileData = xhr.response
local fullFileName = cc.FileUtils:getInstance():getWritablePath() .. "/" .. xhr._urlFileName
local file = io.open(fullFileName,"wb")
file:write(fileData)
file:close()
local texture2d = cc.Director:getInstance():getTextureCache():addImage(fullFileName)
local pSprite = xhr._urlSprite
if texture2d then
pSprite:setTexture(texture2d)
end
pSprite:release() -- be careful
end
end
xhr:registerScriptHandler(onDownloadImage)
xhr:send()