这几天公司用的项目是前后台分离(VUE+springboot),然后就遇到了跨域的问题,跨域问题也不是第一次遇到了,所以这里就把解决方案给记录下来。
首先先了解一下什么是跨域:
跨域是指a页面想获取b页面资源,如果a、b页面的协议、域名、端口、子域名不同,或是a页面为ip地址,b页面为域名地址,所进行的访问行动都是跨域的,而浏览器为了安全问题一般都限制了跨域访问,也就是不允许跨域请求资源。
解决方法应该蛮多的,我这边贴出来几种常用的。
第一种解决办法
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
@Autowired
private EnvConfig envConfig;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new HandlerInterceptor() {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
boolean isTrue = envConfig.getIsDev();//判断是测试服才需要解决跨域问题
if (isTrue) {
response.addHeader("Access-Control-Allow-Origin", "*");
response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
response.addHeader("Access-Control-Allow-Headers",
"Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers,token");
}
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
Exception ex) throws Exception {
}
});
}
}
注意的是,如果你的请求头中带有token这些自定参数的话,要把参数名称放到
response.addHeader(“Access-Control-Allow-Headers”,
“Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers,token”);里面,不然还是会提示有跨域问题的存在。
第二种解决方法:
public class SimpleCORSFilter implements Filter{
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse) res;
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "3600");
//如果要加上自定义请求头,要把参数名放入其中
response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
chain.doFilter(req, res);
}
@Override
public void init(FilterConfig arg0) throws ServletException {
}
}