后端代码接口：
package com.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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
/**
* 解决Rest接口调用过程中，跨域访问问题
* @author lixin
* @version 1.0
*/
public class CORSFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
response.setContentType("textml;charset=UTF-8");
response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "0");
response.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");
response.setHeader("Access-Control-Allow-Credentials", "true");
response.setHeader("XDomainRequestAllowed","1");
chain.doFilter(req, res);
}
public void init(FilterConfig filterConfig) {}
public void destroy() {}
}
web.xml 中的配置：
<filter>
<filter-name>CorsFilter</filter-name>
<filter-class>com.filter.CORSFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CorsFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
前台ajax 请求配置：红色重要
$.ajax({
type:"post",
url:"·····················································",
dataType: 'json',
xhrFields: {
withCredentials: true
},
crossDomain: true,
success:function(data){
$("#dianhua").html(data);
}
});
