这篇文章主要介绍了java服务器端跨域问题解决方案,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

现在很多开发的 API 都支持 ajax 直接请求，这样就会导致跨域的问题，解决跨域的问题一方面可以从前端，另一方面就是服务器端。

一、Controller类名上方添加@CrossOrigin 注解通过此方式注解则Controller中的所有通过@RequestMapping注解的方法都可以进行跨域请求。 代码如下：

@CrossOrigin()
  @RequestMapping("/demoController")
  @Controller
  public class DemoController {
  @Autowired
  IDemoService demoService;

  @RequestMapping(value = "/test", method = RequestMethod.POST)
  @ResponseBody
  public ResultModel test(HttpServletRequest request)
      throws Exception {
    return “right”;
  }
}

二、让所有的controller类继承自定义的BaseController类,该类中将对返回的头部做些特殊处理。

public abstract class BaseController {
 /**
   * description:send the ajax response back to the client side
   * @param responseObj
   * @param response
   */
  protected void writeAjaxJSONResponse(Object responseObj, HttpServletResponse response) {
    response.setCharacterEncoding("UTF-8");

    response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1
    response.setHeader("Pragma", "no-cache"); // HTTP 1.0

    /**
     * for ajax-cross-domain request TODO get the ip address from
     * configration(ajax-cross-domain.properties)
     */
    response.setHeader("Access-Control-Allow-Origin", "*");

    response.setDateHeader("Expires", 0); // Proxies.

    PrintWriter writer = getWriter(response);

    writeAjaxJSONResponse(responseObj, writer);
  }
 /**
   *
   * @param response
   * @return
   */
  protected PrintWriter getWriter(HttpServletResponse response) {
    if(null == response){
      return null;
    }

    PrintWriter writer = null;

    try {
      writer = response.getWriter();
    } catch (IOException e) {
      logger.error("unknow exception", e);
    }

    return writer;
  }

  /**
   * description:send the ajax response back to the client side.
   *
   * @param responseObj
   * @param writer
   * @param writer
   */
  protected void writeAjaxJSONResponse(Object responseObj, PrintWriter writer) {
    if (writer == null || responseObj == null) {
      return;
    }
    try {     writer.write(JSON.toJSONString(responseObj,SerializerFeature.DisableCircularReferenceDetect));
    } finally {
      writer.flush();
      writer.close();
    }
  }
}
接下来就是我们自己业务的 controller 了，其中主要是要调用 writeAjaxJSONResponse(result, response); 这个方法
@Controller
@RequestMapping(value = "/account")
public class AccountController extends BaseController {
@RequestMapping(value = "/add", method = RequestMethod.POST)
  public void addAccount(HttpSession session,HttpServletRequest request,HttpServletResponse response){
    ViewerResult result = new ViewerResult();
     //实现自己业务逻辑代码
    writeAjaxJSONResponse(result, response);
  }

}
好了，这种简单的方式就实现了。