Cors实现java后端完全跨域实例

这篇文章很详细的介绍了js的跨域，给出的解决方案是springboot的方式，假如不用spring boot 或者 spring版本低于4.2就需要自己实现；

参考了spring boot的实现方式，并有所简化，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);
 }

 /**
 * returns {@code true} if the request is a valid cors pre-flight one.
 */
 public boolean ispreflightrequest(httpservletrequest request) {
 return (iscorsrequest(request) && options.equals(request.getmethod()) && request
  .getheader(access_control_request_method) != null);
 }
}

接着在web.xml配置filter即可

 <filter>
  <filter-name>corsfilter</filter-name>
  <filter-class>com.lvluo.web.filter.corsfilter</filter-class>
 </filter>
 <filter-mapping>
  <filter-name>corsfilter</filter-name>
  <url-pattern>/api/*</url-pattern>
 </filter-mapping>

前端测试的js代码，其中客户端的

$.ajax({
  headers : {
   'authorization' :'bearer iboxso9qdrhr0' 
  },
  url: 'http://localhost:8080/service/api/ping',
  type: 'get',
  datatype: 'json',
  success : function(result){
   $("#result").html(result.code);
  }
  })

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。