ajax处理跨域问题

处理跨域的类

public class CrossDamainFilter extends BaseController implements Filter {

 

@Override

public void destroy() {

System.out.println("++++++++++ 跨域过滤器销毁 ++++++++++");

}

 

@Override

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)

throws IOException, ServletException {

HttpServletResponse response = (HttpServletResponse) res;

response.setHeader("Access-Control-Allow-Origin", "*");

response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");

response.setHeader("Access-Control-Max-Age", "3600");

response.setHeader("Access-Control-Allow-Headers", "x-requested-with");

chain.doFilter(req, res);

}

 

@Override

public void init(FilterConfig arg0) throws ServletException {

System.out.println("++++++++++ 跨域过滤器初始化 ++++++++++");

}

 

}

 

 

web.xml文件中配置过滤

 

 

<filter>

<filter-name>crossDamainFilter</filter-name>

<filter-class>com.mcfish.filter.CrossDamainFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>crossDamainFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>