Posted in Javascript onAugust 22, 2016
跨域,前端开发中经常遇到的问题,AngularJS实现跨域方式类似于Ajax,使用CORS机制。
下面阐述一下AngularJS中使用$http实现跨域请求数据。
AngularJS XMLHttpRequest:$http用于读取远程服务器的数据
$http.post(url, data, [config]).success(function(){ ... }); $http.get(url, [config]).success(function(){ ... }); $http.get(url, [config]).success(function(){ ... });
一、$http.jsonp【实现跨域】
1.指定callback
和回调函数名,函数名为JSON_CALLBACK
时,会调用success回调函数,JSON_CALLBACK
必须全为大写。
2.指定其它回调函数,但必须是定义在window下的全局函数。url中必须加上callback
。
二、$http.get【实现跨域】
1.在服务器端设置允许在其他域名下访问
response.setHeader("Access-Control-Allow-Origin", "*"); //允许所有域名访问 response.setHeader("Access-Control-Allow-Origin", "http://www.123.com"); //允许www.123.com访问
2.AngularJS端使用$http.get()
三、$http.post【实现跨域】
1.在服务器端设置允许在其他域名下访问,及响应类型、响应头设置
response.setHeader("Access-Control-Allow-Origin", "*"); response.setHeader("Access-Control-Allow-Methods","POST"); response.setHeader("Access-Control-Allow-Headers","x-requested-with,content-type");
2.AngularJS端使用$http.post()
,同时设置请求头信息
$http.post('http://localhost/ajax/getAllIndustryCategoty.pt',{languageColumn:'name_eu'},{'Content-Type':'application/x-www-form-urlencoded'}).success(function(data){ $scope.industries = data; });
四、实现方式
跨域方式一【JSONP
】:
方法一:
$http.jsonp("http://localhost/sitesettings/getBadgeInfo.pt?jsonp=JSON_CALLBACK&siteid=137bd406").success(function(data){ ... }); // The name of the callback should be the string JSON_CALLBACK.
方法二【返回值,需要使用对应callback方法接收,但如何置于$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端支持跨域请求 public String execute(){ response.setHeader("Access-Control-Allow-Origin", "*"); //允许哪些url可以跨域请求到本域 response.setHeader("Access-Control-Allow-Methods","POST"); //允许的请求方法,一般是GET,POST,PUT,DELETE,OPTIONS response.setHeader("Access-Control-Allow-Headers","x-requested-with,content-type"); //允许哪些请求头
可以跨域
SiteHandlerAction SiteHandler = (SiteHandlerAction) BeansFactory.getBean(SiteHandlerAction.class); List list = SiteHandler.getAllIndustryCategory(); //所有的分类集合 JSONArray jsonArray = JSONArray.fromObject(list); //将list转为json String json = jsonArray.toString(); //转为json字符串 try { PrintWriter write = response.getWriter(); write.print(json); write.close(); } catch (IOException e) { e.printStackTrace(); } return NONE; }
总结
以上就是本文的全部内容,希望本文的内容能对大家学习使用AngularJS有所帮助。
详解AngularJS如何实现跨域请求
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