ajax请求，跨域问题，在Java客户端中解决

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在controller中添加如下代码，这种办法，时灵时不灵，可以尝试下：

        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");         或：        response.addHeader("Access-Control-Allow-Origin", "*");        response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");        response.addHeader("Access-Control-Allow-Headers", "Content-Type");

另外一种方法是在配置文件中统一配置，这样似乎更有效，而且不用在每个controller中的方法中都重复写，更方便。
来自博客http://m.blog.csdn.net/article/details?id=51418384
在项目任意路径下新建一个类CORSFilter.java

public class CORSFilter implements Filter {    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.addHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");        chain.doFilter(req, res);    }    public void init(FilterConfig filterConfig) {}    public void destroy() {}}

在web.xml文件中添加如下代码：

<filter>        <filter-name>cors</filter-name>        <filter-class>xxxx.CORSFilter</filter-class></filter><filter-mapping>         <filter-name>cors</filter-name>         <url-pattern>/*</url-pattern></filter-mapping>

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