摘要：
场景：2个不同语言的后端开发App，项目分别在两台服务器上，一台服务器上的H5网页中有需求需要请求另一台服务器的接口拿数据，造成跨域问题。true:false;System.out.println;}}2.在web.xml中加上跨域的配置请求SimpleCORSFiltercom.aone.app.filter.SimpleCORSFilterIsCrosstrueSimpleCORSFilter/*3.在Springmvc.xml中配置跨域请求4.maven依赖˂!
场景：2个不同语言的后端开发App，项目分别在两台服务器上，一台服务器上的H5网页中有需求需要请求另一台服务器的接口拿数据，造成跨域问题。
解决：
1.定义一个类，实现一个Filter接口(导包导servlet的包)
importjava.io.IOException; importjavax.servlet.Filter; importjavax.servlet.FilterChain; importjavax.servlet.FilterConfig; importjavax.servlet.ServletException; importjavax.servlet.ServletRequest; importjavax.servlet.ServletResponse; importjavax.servlet.http.HttpServletRequest; importjavax.servlet.http.HttpServletResponse; public class SimpleCORSFilter implementsFilter { private boolean isCross = false; @Override public voiddestroy() { isCross = false; } @Override public voiddoFilter(ServletRequest request, ServletResponse response, FilterChain chain) throwsIOException, ServletException { if(isCross) { HttpServletRequest httpServletRequest =(HttpServletRequest) request; HttpServletResponse httpServletResponse =(HttpServletResponse) response; System.out.println("拦截请求: " +httpServletRequest.getServletPath()); httpServletResponse.setHeader("Access-Control-Allow-Origin", "*"); httpServletResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE"); httpServletResponse.setHeader("Access-Control-Max-Age", "0"); httpServletResponse.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"); httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true"); httpServletResponse.setHeader("XDomainRequestAllowed", "1"); } chain.doFilter(request, response); } @Override public void init(FilterConfig filterConfig) throwsServletException { String isCrossStr = filterConfig.getInitParameter("IsCross"); isCross = isCrossStr.equals("true") ? true : false; System.out.println(isCrossStr); } }
2.在web.xml中加上跨域的配置请求
<!-- 跨域请求 -->
<filter>
<filter-name>SimpleCORSFilter</filter-name>
<filter-class>com.aone.app.filter.SimpleCORSFilter</filter-class>
<init-param>
<param-name>IsCross</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>SimpleCORSFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>3.在Springmvc.xml中配置跨域请求
<!-- 接口跨域配置 -->
<mvc:cors>
<mvc:mapping path="/**"
allowed-origins="*"
allowed-methods="POST, GET, OPTIONS, DELETE, PUT"
allowed-headers="Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With"
allow-credentials="true" />
</mvc:cors> 4.maven依赖
<!--解决跨域问题-->
<dependency>
<groupId>com.thetransactioncompany</groupId>
<artifactId>cors-filter</artifactId>
<version>2.5</version>
</dependency>来源：https://blog.csdn.net/qq_43491717/article/details/84134832