解決java前後端分離跨域的問題

第一步

創建如下代碼文件SimpleCORSFilter.java

package gin.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 SimpleCORSFilter implements Filter{

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

HttpServletResponse response = (HttpServletResponse) res;

response.setHeader("Access-Control-Allow-Origin", "*");

response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");

response.setHeader("Access-Control-Max-Age", "3600");

response.setHeader("Access-Control-Allow-Headers", "x-requested-with");

chain.doFilter(req, res);

}

public void init(FilterConfig filterConfig) {}

public void destroy() {}

}

第二步

其次是在web.xml中配置該文件的監聽

<!-- 解決跨域訪問的問題 -->

<filter>

<filter-name>cors</filter-name>

<filter-class>gin.filter.SimpleCORSFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>cors</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

<session-config>

<session-timeout>10</session-timeout>

</session-config>

前端請求方式爲jsonp或者post，get請求即可