跨域,前端開發中經常遇到的問題,AngularJS實現跨域方式類似於Ajax,使用CORS機制。
下面闡述一下AngularJS中使用$http實現跨域請求資料。
AngularJS XMLHttpRequest:$http用於讀取遠程伺服器的資料
$http.post(url, data, [config]).success(function(){ ... });$http.get(url, [config]).success(function(){ ... });$http.get(url, [config]).success(function(){ ... });
一、$http.jsonp【實現跨域】
1.指定callback
和回呼函數名,函數名為JSON_CALLBACK
時,會調用success回呼函數,JSON_CALLBACK
必須全為大寫。
2.指定其它回呼函數,但必須是定義在window下的全域函數。url中必須加上callback
。
二、$http.get【實現跨域】
1.在伺服器端設定允許在其他網域名稱下訪問
response.setHeader("Access-Control-Allow-Origin", "*"); //允許所有網域名稱訪問response.setHeader("Access-Control-Allow-Origin", "http://www.123.com"); //允許www.123.com訪問
2.AngularJS端使用$http.get()
三、$http.post【實現跨域】
1.在伺服器端設定允許在其他網域名稱下訪問,及響應類型、回應標頭設定
response.setHeader("Access-Control-Allow-Origin", "*");response.setHeader("Access-Control-Allow-Methods","POST");response.setHeader("Access-Control-Allow-Headers","x-requested-with,content-type");
2.AngularJS端使用$http.post()
,同時佈建要求頭資訊
$http.post('http://localhost/ajax/getAllIndustryCategoty.pt',{languageColumn:'name_eu'},{'Content-Type':'application/x-www-form-urlencoded'}).success(function(data){ $scope.industries = data; });
四、實現方式
跨域方式一【JSONP
】:
方法一:
$http.jsonp("http://localhost/sitesettings/getBadgeInfo.pt?jsonp=JSON_CALLBACK&siteid=137bd406").success(function(data){ ... });// The name of the callback should be the string JSON_CALLBACK.
方法二【傳回值,需要使用對應callback方法接收,但如何置於$scope
?】:
$http.jsonp("http://localhost/sitesettings/getBadgeInfo.pt?jsonp=badgeabc&siteid=137bd406");function badgeabc(data){ ... }public String execute() throws Exception { String result = FAIL; response.setHeader("", ""); SiteHandlerAction siteHandlerAction = (SiteHandlerAction)BeansFactory.getBean(SiteHandlerAction.class); BadgeHandlerAction badgeHandlerAction = (BadgeHandlerAction)BeansFactory.getBean(BadgeHandlerAction.class); if("".equals(siteid) || siteid == null || StringUtils.isBlank("jsonp")){ result = FAIL; }else{ Site site = siteHandlerAction.find(siteid); UserBadgeStatus userBadgeStatus = badgeHandlerAction.getUserBadgeStatus(site.getId()); if(userBadgeStatus != null){ result = "{\"t\":"+userBadgeStatus.getStyle()+",\"l\":"+userBadgeStatus.getSuspend_location()+",\"s\":"+site.getId()+"}"; JSONObject jsonObj = JSONObject.fromObject(result); String json = jsonObj.toString(); result = jsonp + "(" + json + ")"; } } PrintWriter write = response.getWriter(); write.print(result); write.flush(); write.close(); return NONE;}
跨域方式二【$http.get()
】:
function getAdustryController($scope,$http){ $http.get('http://localhost/ajax/getAllIndustryCategoty.pt?languageColumn=name_eu').success(function(data){ $scope.industries = data; });}
跨域方式三【$http.post()
】:
function getAdustryController($scope,$http){ $http.post('http://localhost/ajax/getAllIndustryCategoty.pt',{languageColumn:'name_eu'},{'Content-Type':'application/x-www-form-urlencoded'}).success(function(data){ $scope.industries = data; });}// java端支援跨域請求public String execute(){ response.setHeader("Access-Control-Allow-Origin", "*"); //允許哪些url可以跨域請求到本域 response.setHeader("Access-Control-Allow-Methods","POST"); //允許的要求方法,一般是GET,POST,PUT,DELETE,OPTIONS response.setHeader("Access-Control-Allow-Headers","x-requested-with,content-type"); //允許哪些要求標頭
可以跨域
SiteHandlerAction SiteHandler = (SiteHandlerAction) BeansFactory.getBean(SiteHandlerAction.class);List list = SiteHandler.getAllIndustryCategory(); //所有的分類集合JSONArray jsonArray = JSONArray.fromObject(list); //將list轉為jsonString json = jsonArray.toString(); //轉為json字串try { PrintWriter write = response.getWriter(); write.print(json); write.close();} catch (IOException e) { e.printStackTrace();}return NONE;}
總結
以上就是本文的全部內容,希望本文的內容能對大家學習使用AngularJS有所協助。