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、$http.get【实现跨域】
1.在服务器端设置允许在其他域名下访问
2.AngularJS端使用$http.get()
三、$http.post【实现跨域】
1.在服务器端设置允许在其他域名下访问,及响应类型、响应头设置
2.AngularJS端使用$http.post()
,同时设置请求头信息
四、实现方式
跨域方式一
【JSONP
】:
方法一:
方法二【返回值,需要使用对应callback方法接收,但如何置于$scope
?】:
public String execute() throws Exception {
String result = FAIL;
response.setHeader("","");
SiteHandlerAction siteHandlerAction = (SiteHandlerAction)BeansFactory.getBean(SiteHandlerAction.class);
BadgeHandlerAction badgeHandlerAction = (BadgeHandlerAction)BeansFactory.getBean(BadgeHandlerAction.class);
if("".equals(siteid) || siteid == null || StringUtils.isBlank("jsonp")){
result = FAIL;
}else{
Site site = siteHandlerAction.find(siteid);
UserBadgeStatus userBadgeStatus = badgeHandlerAction.getUserBadgeStatus(site.getId());
if(userBadgeStatus != null){
result = "{\"t\":"+userBadgeStatus.getStyle()+",\"l\":"+userBadgeStatus.getSuspend_location()+",\"s\":"+site.getId()+"}";
JSONObject jsonObj = JSONObject.fromObject(result);
String json = jsonObj.toString();
result = jsonp + "(" + json + ")";
}
}
PrintWriter write = response.getWriter();
write.print(result);
write.flush();
write.close();
return NONE;
}
String result = FAIL;
response.setHeader("","");
SiteHandlerAction siteHandlerAction = (SiteHandlerAction)BeansFactory.getBean(SiteHandlerAction.class);
BadgeHandlerAction badgeHandlerAction = (BadgeHandlerAction)BeansFactory.getBean(BadgeHandlerAction.class);
if("".equals(siteid) || siteid == null || StringUtils.isBlank("jsonp")){
result = FAIL;
}else{
Site site = siteHandlerAction.find(siteid);
UserBadgeStatus userBadgeStatus = badgeHandlerAction.getUserBadgeStatus(site.getId());
if(userBadgeStatus != null){
result = "{\"t\":"+userBadgeStatus.getStyle()+",\"l\":"+userBadgeStatus.getSuspend_location()+",\"s\":"+site.getId()+"}";
JSONObject jsonObj = JSONObject.fromObject(result);
String json = jsonObj.toString();
result = jsonp + "(" + json + ")";
}
}
PrintWriter write = response.getWriter();
write.print(result);
write.flush();
write.close();
return NONE;
}
跨域方式二
【$http.get()
】:
跨域方式三
【$http.post()
】:
// 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",content-type"); //允许哪些请求头
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",content-type"); //允许哪些请求头
可以跨域
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;
}