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$http實現跨域請求數據。
AngularJS XMLHttpRequest:$http用於讀取遠程服務器的數據
$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和回調函數名,函數名為JSON_CALLBACK時,會調用success回調函數,JSON_CALLBACK必須全為大寫。
2. 指定其它回調函數,但必須是定義在window下的全局函數。url中必須加上callback。
二、$http.get【實現跨域】
1. 在服務器端設置允許在其他域名下訪問
response.setHeader("Access-Control-Allow-Origin", "*"); //允許所有域名訪問 response.setHeader("Access-Control-Allow-Origin", "http://www.123.com"); //允許www.123.com訪問 |
2. AngularJS端使用$http.get()
三、$http.post【實現跨域】
1. 在服務器端設置允許在其他域名下訪問,及響應類型、響應頭設置
response.setHeader("Access-Control-Allow-Origin", "*"); response.setHeader("Access-Control-Allow-Methods","POST"); response.setHeader("Access-Control-Allow-Headers","x-requested-with,content-type"); |
2. AngularJS端使用$http.post(),同時設置請求頭信息
$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:
$http.jsonp("http://localhost/sitesettings/getBadgeInfo.pt?jsonp=JSON_CALLBACK&siteid=137bd406").success(function(data){ ... }); // The name of the callback should be the string JSON_CALLBACK. |
方法二【返回值,需要使用對應callback方法接收,但如何置於$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端支持跨域請求 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"); //允許的請求方法,一般是GET,POST,PUT,DELETE,OPTIONS response.setHeader("Access-Control-Allow-Headers","x-requested-with,content-type"); //允許哪些請求頭可以跨域 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json String json = jsonArray.toString(); //轉為json字符串 try { PrintWriter write = response.getWriter(); write.print(json); write.close(); } catch (IOException e) { e.printStackTrace(); } return NONE; } |
http://www.ruanyifeng.com/blog/2016/04/cors.html