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详解AngularJS如何实现跨域请求

2019-11-20 09:10:48
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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jsonString 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。

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