前后端的分离
跨域的痛点,平常工作中前端需要调用你本地或者测试的接口,未部署测试环境之前,需要本地调用测试,
使用java一个类就可以解决,贴代码：
package com.bs.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
public class CorsFilter implements Filter{
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
System.out.println("************************ 跨域过滤器 start ************************");
HttpServletResponse res = (HttpServletResponse) response;
res.setContentType("text/html;charset=UTF-8");
res.setHeader("Access-Control-Allow-Origin", "*");
res.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
res.setHeader("Access-Control-Max-Age", "0");
res.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");
res.setHeader("Access-Control-Allow-Credentials", "true");
res.setHeader("XDomainRequestAllowed","1");
System.out.println("************************ 跨域过滤器 end ************************");
chain.doFilter(request, response);
}
@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}另外需要在web.xml中配置filter拦截
<filter> <filter-name>cors</filter-name> <filter-class>com.bs.filter.CorsFilter</filter-class> </filter> <filter-mapping> <filter-name>cors</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
至此完美解决跨域问题。
