servlet跨域访问
① 使用jquery跨域访问servlet,那不到数据,但是在浏览器看请求记录,里面是有返回参数的
JQuery跨域问题要用Jsonp
http://www.cnblogs.com/JerryTian/p/4194900.html
这有详细的讲解
② java跨域问题
跨域问题一般都在后台程序解决，将自己的程序通过配置文件或者代码将其允许跨域，
在有跨域安全的时候，所有前端post请求时，会发送一个与其请求名字一样的OPTIONS
此请求没有任何参数，此机制为post不知道是否有权限请求接口，发送了一个探知请求，探知
请求确认后，允许访问后调用正常Post接口。 不允许就会出现你现在的问题跨域异常。
萌新，java是开源的，比NET好多了，多看看底层
③ jsp跨域怎么调用servlet
跨域策略两种方式：
1：使用jsonp
2：使用cors
如果servlet返回jsop数据，就可以使用jsonp
参考代码：
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
String callback=request.getParameter("callback");
// 调用业务逻辑组件获得全部用户数据
List<User> users = UserBiz.select();
JSONArray jsonArr = new JSONArray(users);
if (callback!=null){
response.setContentType("text/javascript; charset=UTF-8");
response.getWriter().println(callback+"("+jsonArr.toString()+");");
}else{
response.setContentType("text/html; charset=UTF-8");
response.getWriter().println(jsonArr.toString());
}
}
④ 如何用servlet访问别人的url
我也有同样的问题，我需要自己写一个servlet，去跨域访问别人服务器上的数据，不知道你是否知道解决方法，知道的话烦请告知一下，我也想学习
⑤ servlet可以结合CROS实现ajax跨域访问吗如何做
如果就是servlet的话，那简简单单一个filter就能搞定，而且已经有人做了，直接拿来用吧：cors-filter。
如果你的问题是不理解跨域，那你得看：构建public APIs与CORS
⑥ 在Jenkins中报严重违规：Servlet反射跨域脚本漏洞 writer.print(value);
脚本（script）是使用一种特定的描述性语言，依据一定的格式编写的可执行文件，又称作宏或批处理文件。脚本是批处理文件的延伸，是一种纯文本保存的程序，一般来说的计算机脚本程序是确定的一系列控制计算机进行运算操作动作的组合，在其中可以实现一定的逻辑分支等。
⑦ JS跨域访问 通过 Spring mvc 拦截器修改返回值 HttpServletResponse
给你个例子，controller需要支持跨域的方法：
public Map<String ,Object> index(ServletResponse res){
HttpServletResponse response = (HttpServletResponse)res;
response.addHeader("Access-Control-Allow-Origin", "*");
response.addHeader("Access-Control-Allow-Methods", "POST,GET,PUT,DELETE,OPTIONS");
response.addHeader("Access-Control-Allow-Credentials", "true");
response.addHeader("Access-Control-Allow-Headers", "Content-Type,X-Requested-With,token");
response.addHeader("Access-Control-Max-Age", "600000");
//TODO
...
}
这样就支持跨域了，但是这种方式不怎么安全，"Access-Control-Allow-Origin"后面的*代表支持所有域名。
⑧ 怎么解决服务器间的跨域问题
通过设置Http Header方式允许跨域名请求
<?php
header("Access-Control-Allow-Origin: http://www.requesting-page.com");
?>
more details
browser(client) side code examples:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS
server side code examples:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Server-Side_Access_Control
怎样配置Apache 服务器允许跨域名请求
How do we fix cross domain scripting issue ?
The simple solution is to allow the server to which request is being
made to server request to any domain or to a list of domains. The
important thing to remember is that the changes are to be made in the server which is serving the web service.
There are multiple ways to do it
1. You change settings in your apache’s httpd-vhosts.conf file ( I am using Apache 2.2 )
<VirtualHost *:80>
ServerAdmin [email protected]
DocumentRoot “C:/apache-tomcat-6.0.29/webapps/myApplication”
ServerName skill-guru.com
ErrorLog “logs/skg1-error.log”
CustomLog “logs/skg1-access.log” common
Header set Access-Control-Allow-Origin “*”
<Directory “C:/apache-tomcat-6.0.29/webapps/myApplication”>
Options -Indexes FollowSymLinks
AllowOverride AuthConfig FileInfo
Order allow,deny
Allow from all
</Directory>
JkUnmount /*.jsp ajp13
</VirtualHost>
Now after you set the value in apache server and look at the header and would see
HTTP/1.1 200 OK
Date: Mon, 01 Dec 2008 00:23:53 GMT
Server: Apache/2.0.61
Access-Control-Allow-Origin: *
Keep-Alive: timeout=2, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: application/xml
怎样配置Tomcat 服务器允许跨域名请求
If you do not plan to use Apache and for some reasons using tomcat or
any other similar web container which supports filter, here is a ready
made solution, Cors
Filter
This gives you a servlet filter which is compatible with any Java Servlet 2.5+ web container.
Installation is very simple. Add the jar to your libraries
In you web.xml
add this line
<filter>
<filter-name>CORS</filter-name>
<filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CORS</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
⑨ felx 用 httpservice 另一个工程httpservlet （跨域访问）
参考答案 温故而知新。
⑩ spring mvc 怎么允许跨域访问
Controller的每一个请求返回的时候都加上Access-Control-...header，需要注意的是并不是所有的浏览器都支持这些header,使用之前要先了解清楚。
实现起来也很简单那就是Interceptor,代码如下:
ublic class AccessKeyInterceptor extends HandlerInterceptorAdapter {
private static Log log=LogFactory.getLog(AccessKeyInterceptor.class);
@Autowired
private IAccessService accessService;
private String accessKeyParameterName="accessKey";
private List<String> defaultAccessAllowedFrom;
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
String accessKey=request.getParameter(accessKeyParameterName);
String referer = request.getHeader("Referer");
URL u = new URL(referer);
String host = u.getHost().toLowerCase();
if(accessKey==null){
log.error("====================================ILLEGAL ACCESS: ACCESS_KEY_MISSING!=======================");
}else{
log.debug("====================================ACCESS WITH Access KEY:"+accessKey+"====================");
IAccess access = accessService.getAccess(UserSessionUtils.getUserSession(request), accessKey);
if(access!=null){
defaultAccessAllowedFrom=access.getAccessAllowedFrom();
}else{
log.warn("======================================ACCESS KEY:"+accessKey+" DOES NOT EXIST!=================");
}
}
for(String s : defaultAccessAllowedFrom) {
if(host.matches(s)){
response.setHeader("Access-Control-Allow-Origin", referer);
break;
}
}
response.setHeader("Access-Control-Allow-Headers", "Content-Type");
response.setHeader("Access-Control-Allow-Methods", "GET");
response.setHeader("Allow", "GET");
return true;
}
public List<String> getDefaultAccessAllowedFrom() {
return defaultAccessAllowedFrom;
}
public void setDefaultAccessAllowedFrom(List<String> defaultAccessAllowedFrom) {
this.defaultAccessAllowedFrom = defaultAccessAllowedFrom;
}
public String getAccessKeyParameterName() {
return AccessKeyParameterName;
}
public void setAccessKeyParameterName(String accessKeyParameterName) {
this.AccessKeyParameterName = AccessKeyParameterName;
}
}