关于Java跨域的总结

使用crossdomain.xml 文件实现跨域(flex)配置filter过滤器 配置springMVC

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* 1. 首先使用用crossdomain.xml文件实现跨域 *

<?xml version="1.0"?> <cross-domain-policy> <allow-access-from domain="localhost:8080" /> </cross-domain-policy>

表示允许来源为本地8080端口的请求，因为Tomcat默认是访问的webapp下面的root目录，所以要将这个文件放到该目录下。。

* 2. 使用过滤器实现 *

<filter> <display-name>AcrossDomainFilter</display-name> <filter-name>AcrossDomainFilter</filter-name> <filter-class>com.test.demo.filter.AcrossDomainFilter</filter-class> </filter> <filter-mapping> <filter-name>AcrossDomainFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

Java代码为：

/** * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain) * 配置跨域过滤器 * */ public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpRequest = (HttpServletRequest) request; HttpServletResponse httpResponse = (HttpServletResponse) response; httpResponse.addHeader("Access-Control-Allow-Origin", "*"); httpResponse.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE"); httpResponse.addHeader("Access-Control-Allow-Headers", "Content-Type"); httpResponse.addHeader("Access-Control-Max-Age", "1800");//30 min chain.doFilter(httpRequest, httpResponse); }

* 3. 使用springMVC配置文件 *

<mvc:cors> <mvc:mapping path="/**" allowed-origins="*" allow-credentials="true" max-age="1800" allowed-methods="GET,POST,OPTIONS"/> </mvc:cors>

因为使用了springMVC 所以也可以利用它来配置跨域。因为这个项目前端是跑在node里面，所以开发的时候不得已需要跨域。