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(){ ... });
$http.get(url, [config]).success(function(){ ... });
|
1. 指定callback和回调函数名，函数名为JSON_CALLBACK时，会调用success回调函数，JSON_CALLBACK必须全为大写。
2. 指定其它回调函数，但必须是定义在window下的全局函数。url中必须加上callback。
1. 在服务器端设置允许在其他域名下访问
response.setHeader("Access-Control-Allow-Origin", "*"); //允许所有域名访问
response.setHeader("Access-Control-Allow-Origin", "http://www.123.com"); //允许www.123.com访问
|
2. AngularJS端使用$http.get()
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;
});
|
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?】：
$http.jsonp("http://localhost/sitesettings/getBadgeInfo.pt?jsonp=badgeabc&siteid=137bd406");
function badgeabc(data){ ... }
|
public String execute() throws Exception {
String result = FAIL;
response.setHeader("", "");
SiteHandlerAction siteHandlerAction = (SiteHandlerAction)BeansFactory.getBean(SiteHandlerAction.class);
BadgeHandlerAction badgeHandlerAction = (BadgeHandlerAction)BeansFactory.getBean(BadgeHandlerAction.class);
if("".equals(siteid) || siteid == null || StringUtils.isBlank("jsonp")){
result = FAIL;
}else{
Site site = siteHandlerAction.find(siteid);
UserBadgeStatus userBadgeStatus = badgeHandlerAction.getUserBadgeStatus(site.getId());
if(userBadgeStatus != null){
result = "{\"t\":"+userBadgeStatus.getStyle()+",\"l\":"+userBadgeStatus.getSuspend_location()+",\"s\":"+site.getId()+"}";
JSONObject jsonObj = JSONObject.fromObject(result);
String json = jsonObj.toString();
result = jsonp + "(" + json + ")";
}
}
PrintWriter write = response.getWriter();
write.print(result);
write.flush();
write.close();
return NONE;
}
|
function getAdustryController($scope,$http){
$http.get(‘http://localhost/ajax/getAllIndustryCategoty.pt?languageColumn=name_eu‘).success(function(data){
$scope.industries = data;
});
}
|
function getAdustryController($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;
}
|
http://www.ruanyifeng.com/blog/2016/04/cors.html
原文：http://www.cnblogs.com/happiness-mumu/p/6265996.html