前后端分离，遇到跨域问题，java中的解决方案，前端不需要做跨域问题解决，后端去解决跨域问题。
只要在项目中添加一个过滤器就可以了，如下：
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Component
@WebFilter(urlPatterns = "/*",filterName = "myFilter")
public class MyFilter implements Filter {
Logger loger = LoggerFactory.getLogger(MyFilter.class);
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest sRequest, ServletResponse sResponse, FilterChain chain) throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse) sResponse;
response.setHeader("Access-Control-Allow-Origin", "*"); //解决跨域访问报错
response.setHeader("Access-Control-Allow-Credentials","true");
response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "3600"); //设置过期时间
response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, client_id, uuid, Authorization");
response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // 支持HTTP 1.1.
response.setHeader("Pragma", "no-cache"); // 支持HTTP 1.0. response.setHeader("Expires", "0");
chain.doFilter(sRequest, sResponse);
}
@Override
public void destroy() {
}
}