前后端分离开发需要跨域，之前只会pringboot跨域，只需要一个配置类即可，下面记录一下ssm的配置

三个文件需要添加配置

SimpleCORSFilter.java实现Filter

public class SimpleCORSFilter implements Filter {
    private boolean isCross = false;

    @Override
    public void destroy() {
        isCross = false;
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, 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) throws ServletException {
        String isCrossStr = filterConfig.getInitParameter("IsCross");
        isCross = isCrossStr.equals("true") ? true : false;
        System.out.println(isCrossStr);
    }

dispatcher-servlet.xml(springMVC的配置文件)

<!--     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>
    

## web.xml

     <!-- 跨域请求 -->
  <filter>
    <filter-name>SimpleCORSFilter</filter-name>
    <filter-class>com.maxcore.config.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>

## 完毕

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