目标：tomcat服务器提供的接口，不能在其他域中访问的时候，需要增 Access-Control-Allow-Origin:*
直接配置的方法很多，但是我一个没有成功过，所以只能自己写拦截器了。
1. 编写拦截器代码
新建一个类，实现Filter接口，代码如下
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package
com.itxc.filter;
import
javax.servlet.*;
import
javax.servlet.http.HttpServletResponse;
import
java.io.IOException;
public
class
CORSFilter
implements
Filter {
@Override
public
void
init(FilterConfig filterConfig)
throws
ServletException {
}
@Override
public
void
doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws
IOException, ServletException {
HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;
httpResponse.addHeader(
"Access-Control-Allow-Origin"
,
"*"
);
filterChain.doFilter(servletRequest, servletResponse);
}
@Override
public
void
destroy() {
}
}
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2. 配置web.xml
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<
filter
>
<
filter-name
>CorsFilter</
filter-name
>
<
filter-class
>com.itxc.filter.CORSFilter</
filter-class
>
</
filter
>
<
filter-mapping
>
<
filter-name
>CorsFilter</
filter-name
>
<
url-pattern
>/*</
url-pattern
>
</
filter-mapping
>
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3. 删除你之前为了这个功能配置的乱起八糟的配置吧