添加以下設(shè)置可允許所有域名跨域訪問：

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

但在實(shí)際應(yīng)用中，為了安全起見，不應(yīng)該讓所有域名都能跨域請求服務(wù)器API，需要設(shè)置指定的幾個(gè)域名可以訪問，直接通過以下代碼是不能實(shí)現(xiàn)的

response.setHeader("Access-Control-Allow-Origin","http://localhost:8000, http://oa.ewsd.cn");

可把需要指定能跨域訪問的域名通過數(shù)組的方式進(jìn)行設(shè)置，代碼如下：

// 允許跨域請求
String[] allowDomain = {"http://localhost:8000", "http://oa.ewsd.cn"};
Set<String> allowedOrigins = new HashSet<String>(Arrays.asList(allowDomain));
String originHeader = request.getHeader("Origin");
if (allowedOrigins.contains(originHeader)) {
    response.setHeader("Access-Control-Allow-Origin", originHeader);
    response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Cookie");
    response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, PATCH");
    response.setHeader("Access-Control-Allow-Credentials", "true");
}

參考：http://blog.csdn.net/zlp_zky/article/details/70213811