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Java 发布时间：2019-10-05 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了Springmvc ajax跨域请求处理方法实例详解，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

上次给一个网站写网站前后端分离最后跪在ajax跨域上面了自己在网上找了个方法亲试可用记录一下

写一个类继承HandlerInterceptorAdapter

package com.util;
import javax.servlet.http.httpServletrequest;
import javax.servlet.http.httpServletResponse;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
public class CommonInterceptor extends HandlerInterceptorAdapter {
public Boolean preHandle(httpServletrequest request,httpServletResponse response,Object handler) throws Exception {
response.setHeader("Access-Control-Allow-Origin","*");
response.setHeader("Access-Control-Allow-Methods","*");
response.setHeader("Access-Control-Max-Age","3600");
response.setHeader("Access-Control-Allow-Headers","Origin,X-requested-With,Content-Type,Accept");
response.setHeader("Access-Control-Allow-Credentials","true"); // 是否允许浏览器携带用户身份信息（cookie）
return true;
}
}

然后在xml里面配置一下路径

<mvc:interceptors>
<!--过滤所有请求，处理跨域请求问题 -->
<mvc:interceptor>
<mvc:mapping path="/**" />
<bean class="com.util.CommonInterceptor" />
</mvc:interceptor>
</mvc:interceptors>

　这样就可以了不过有篇博客说针对简单跨域没问题。但是针对post＋json请求却失败，提示跨域失败。所以下面记录一下他的解决方式

建立一个类继承 OncePerrequestFilter

public class CrossFilter extends OncePerrequestFilter {
  @Override
  protected void doFilterInternal(httpServletrequest request,FilterChain filterChain) throws ServletException,IOException {
    if (request.getHeader("Access-Control-request-Method") != null && "OPTIONS".equals(request.getMethod())) {
      // CORS "pre-flight" request
      response.addHeader("Access-Control-Allow-Origin","*");
      response.addHeader("Access-Control-Allow-Methods","GET,POST,PUT,deletE");
      response.addHeader("Access-Control-Allow-Headers","Content-Type");
      response.addHeader("Access-Control-Max-Age","1800");//30 min
    }
    filterChain.doFilter(request,responsE);
  }
}

web.xml里面设置一下

<filter>
  <filter-name>cors</filter-name>
  <filter-class>cn.***.filter.CrossFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>cors</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

然后就可以了上述方式为spring3.0版本如果是4.0版本可以用下面方式（无测）

xml里面配置

  <mvc:cors>
    <mvc:mapping path="/**" allowed-origins="*" allow-credentials="true" max-age="1800" allowed-methods="GET,OPTIONS"/>
  </mvc:cors>

PS：使用SpringMVC解决Ajax跨域问题

package com.mengyao.system.filter;
 import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.httpServletrequest;
import javax.servlet.http.httpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.oncePerrequestFilter;
/**
 * CORSFilter 解决跨域问题
 * @author mengyao
 *
 */
@Component
public class InitCORSFilter extends OncePerrequestFilter {
  private Logger logger = LoggerFactory.getLogger(InitCORSFilter.class);
  public InitCORSFilter() {
    logger.info("==== 初始化系统允许跨域请求 ====");
  }
  /**
   * 解决跨域：Access-Control-Allow-Origin，值为*表示服务器端允许任意Domain访问请求
   */
  @Override
  protected void doFilterInternal(httpServletrequest request,FilterChain filterChain)
      throws ServletException,IOException {
    if (request.getHeader("Access-Control-request-Method") != null && "OPTIONS".equals(request.getMethod())) {
      response.addHeader("Access-Control-Allow-Origin",deletE,OPTIONS");
      response.addHeader("Access-Control-Allow-Headers","origin,content-type,accept,x-requested-with,sid,mycustom,smuser");
      response.addHeader("Access-Control-Max-Age",responsE);
  }
}