后臺代碼：
package com.cn.Mr.Zhong.filter;

import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

//@Component
public class CorsFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest requset, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req=(HttpServletRequest)requset;
HttpServletResponse resp=(HttpServletResponse)response;
String u=req.getParameter("username");
String p=req.getParameter("password");
String r=req.getParameter("randomcode");
HttpSession session = req.getSession();
// String validateCode = SessionUtil.getValidateCodeFromSession("validateCode");
// String randomcode = req.getParameter("randomcode");
// System.out.println(validateCode+"=="+randomcode);
System.out.println("######################"+session.getId());
// SessionUtil.setValToSession("validateCode", r);
//session.setAttribute("validateCode",r);
// Serializable id = SessionUtil.getSession().getId();
// System.out.println("#######"+id);
// SessionUtil.setValToSession("jsessionid",id);
// resp.setHeader("Access-Control-Allow-Origin", "http://IP地址:8080");
// resp.setHeader("Access-Control-Allow-Origin", "http://IP地址:3000");
String origin = req.getHeader("Origin");
System.out.println(origin);
resp.setHeader("Access-Control-Allow-Origin", origin);
resp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PUT");
resp.setHeader("Access-Control-Max-Age", "3600");
resp.setHeader("Access-Control-Allow-Headers", "x-requested-with,Authorization,Content-Type");
resp.setHeader("Access-Control-Allow-Credentials", "true");
if ("OPTIONS".equalsIgnoreCase(req.getMethod())){
resp.setStatus(200);
return;
}
chain.doFilter(requset, resp);
}
@Override
public void destroy() {
}
}

在web.xml中添加：

<!--CORS--> <filter>
<filter-name>corsFilter</filter-name>
<filter-class>com.cn.Mr.Zhong.CorsFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>corsFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> 然后等待前端發送請求，后臺debug截數據，與前端商量數據格式！



此隨筆還未編寫完整！待續~~~

轉載于:https://www.cnblogs.com/MrNeng/p/9924264.html

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