Springmvc ajax跨域请求处理方法实例详解

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, httpservletresponse response, 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,post,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, httpservletresponse response, filterchain filterchain)
      throws servletexception, ioexception {
    if (request.getheader("access-control-request-method") != null && "options".equals(request.getmethod())) {
      response.addheader("access-control-allow-origin", "*");
      response.addheader("access-control-allow-methods", "get, post, put, delete, options");
      response.addheader("access-control-allow-headers", "origin, content-type, accept, x-requested-with, sid, mycustom, smuser");
      response.addheader("access-control-max-age", "1800");//30 min
    }
    filterchain.dofilter(request, response);
  }
}

好了，代码到此结束！

总结

以上所述是小编给大家介绍的springmvc ajax跨域请求处理方法实例详解，希望对大家有所帮助