java项目中使用Cors实现后端跨域的法

今天就跟大家聊聊有关java项目中使用Cors实现后端跨域的法，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。

代码如下：

package com.lvluo.WEB.filter.CorsFilter;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.http.HttpHeaders;public class CorsFilter implements Filter { public static final String ACCESS_CONTROL_REQUEST_METHOD = "Access-Control-Request-Method"; public static final String OPTIONS = "OPTIONS"; public void doFilter(ServletRequest request, ServletResponse response,  FilterChain chain) throws IOException, ServletException { HttpServletRequest httpRequest = (HttpServletRequest) request; HttpServletResponse httpResponse = (HttpServletResponse) response; if (isCorsRequest(httpRequest)) {  httpResponse.setHeader("Access-Control-Allow-Origin", "*");  httpResponse.setHeader("Access-Control-Allow-Methods",   "POST, GET, PUT, DELETE");  httpResponse.setHeader("Access-Control-Allow-Credentials", "true");  // response.setIntHeader("Access-Control-Max-Age", 1728000);  httpResponse   .setHeader(    "Access-Control-Allow-Headers",    "Origin, X-Requested-With, Content-Type, Accept, Accept-Encoding, Authorization");  if (isPreFlightRequest(httpRequest)) {  return;  } } chain.doFilter(request, response); } public void init(FilterConfig filterConfig) { } public void destroy() { } public boolean isCorsRequest(HttpServletRequest request) { return (request.getHeader(HttpHeaders.ORIGIN) != null); }  public boolean isPreFlightRequest(HttpServletRequest request) { return (isCorsRequest(request) && OPTIONS.equals(request.getMethod()) && request  .getHeader(ACCESS_CONTROL_REQUEST_METHOD) != null); }}