spring boot配合前端实现跨域请求访问
一.方法:
- 服务端设置ResponeHeader头中Access-Control-Allow-Origin
- 配合前台使用jsonp
- 继承WebMvcConfigurerAdapter添加配置类
二.实例:
1.前端:因为我们用了前后端分离,前端用node服务器,node服务器再用了ajax反向代理请求到我的springboot服务器。其中node服务器也用了ajax发出请求所以也存在跨域的问题。具体代码:
app.all(apiRoot+'/*',proxy('127.0.0.1:'+proxyPort,{ forwardPath:function(req,res){ console.log('req:',req,'res;',res); returnrequire('url').parse(req.url).path; } }));
后台(用的是springboot1.3.7.RELEASE):用了一个filter进行了身份验证同时进行了跨域处理,具体代码:
publicclassAuthFilterimplementsFilter{ //@Autowired //这个不能自动注入servlet和filter是被tomcat管理的 privateBaseUserServicebaseUserService; privateString[]excludePaths; @Override publicvoidinit(FilterConfigfilterConfig)throwsServletException{ System.out.println("initFilter"); //不能在初始化中通过AppliactionContext获取因为这时候还没初始化ApplicationContext //baseUserService=SpringUtils.getBean("baseUserService",BaseUserService.class); excludePaths=newString[]{"/api/user/noLogin","/api/user/tokenError","/api/user/loginForeground", "/api/user/loginBackground","/api/user/inCorrectUserId"}; } @Override publicvoiddoFilter(ServletRequestrequest,ServletResponseresponse,FilterChainchain)throwsIOException,ServletException{ HttpServletRequesthttpServletRequest=(HttpServletRequest)request; HttpServletResponsehttpServletResponse=(HttpServletResponse)response; //这里填写你允许进行跨域的主机ip httpServletResponse.setHeader("Access-Control-Allow-Origin","*"); //允许的访问方法 httpServletResponse.setHeader("Access-Control-Allow-Methods","POST,GET,PUT,OPTIONS,DELETE,PATCH"); //Access-Control-Max-Age用于CORS相关配置的缓存 httpServletResponse.setHeader("Access-Control-Max-Age","3600"); httpServletResponse.setHeader("Access-Control-Allow-Headers","Origin,X-Requested-With,Content-Type,Accept"); StringuserId=request.getParameter("userId"); Stringtoken=request.getParameter("token"); //有token的` if(userId!=null&&token!=null){ try{ Integerid=Integer.parseInt(userId); if(baseUserService==null) baseUserService=SpringUtils.getBean("baseUserService",BaseUserService.class); intstatus=baseUserService.checkLogin(id,token); if(status==1){ chain.doFilter(request,response); }elseif(status==0){ httpServletResponse.sendRedirect("/api/user/tokenError"); }elseif(status==-2){ httpServletResponse.sendRedirect("/api/user/inCorrectUserId"); }else{ httpServletResponse.sendRedirect("/api/user/noLogin"); } }catch(NumberFormatExceptionexception){ httpServletResponse.sendRedirect("/api/user/inCorrectUserId"); } }else{ Stringpath=httpServletRequest.getServletPath(); if(excludePath(path)){ chain.doFilter(request,response); }else{ httpServletRequest.getRequestDispatcher("/api/user/noLogin").forward(request,response); } } //((HttpServletResponse)response).addHeader("Access-Control-Allow-Origin","*"); //CorsFiltercorsFilter=newCorsFilter(); } privatebooleanexcludePath(Stringpath){ for(inti=0;i这种方法还适用于servlet中,特别注意的是一定要在filter动作之前加上这句话,也就是在代码的最前面加上这个话。
跨域资源共享CORS详解(相关链接)
2.详细请看(点开)
3.具体代码:packageedu.ecnu.yjsy.conf; importorg.springframework.context.annotation.Configuration; importorg.springframework.web.servlet.config.annotation.CorsRegistry; importorg.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; @Configuration publicclassCorsConfigextendsWebMvcConfigurerAdapter{ @Override publicvoidaddCorsMappings(CorsRegistryregistry){ registry.addMapping("/**") .allowedOrigins("*") .allowCredentials(true) .allowedMethods("GET","POST","DELETE","PUT") .maxAge(3600); } }这里有个坑springboot以前的版本这样设置可以用但是我用的1.3.7.RELEASEspringboot不能用,所以用第二种方式是万能的
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毛票票。