public class testFilter implements Filter { 


public void doFilter(ServletRequest request, ServletResponse resp, FilterChain chain) throws IOException, ServletException {

HttpServletResponse response = (HttpServletResponse) resp; 

//解决跨域访问报错

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

//设置过期时间 
response.setHeader("Access-Control-Max-Age", "3600"); 
response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, client_id, uuid, Authorization"); 

// 支持HTTP 1.1. 
response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");

// 支持HTTP 1.0. response.setHeader("Expires", "0"); 
response.setHeader("Pragma", "no-cache");

chain.doFilter(req, res); 

} 

public void init(FilterConfig filterConfig) {} 

public void destroy() {}}