java后端解决跨域的几种问题解决
1.java过滤器过滤
允许整个项目跨域访问,可通过filter来进行过虑:
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"); response.setHeader("Access-Control-Allow-Headers", "x-requested-with"); chain.doFilter(req, res); } @Override public void init(FilterConfig arg0) throws ServletException { } }
在web.xml中需要添加如下配置:
<filter> <filter-name>cors</filter-name> <filter-class>com.ssm.web.filter.SimpleCORSFilter</filter-class> </filter> <filter-mapping> <filter-name>cors</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </filter>
为单个方法提供跨域访问,直接添加请求头:
response.setHeader("Access-Control-Allow-Origin", "*"); response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE"); response.setHeader("Access-Control-Max-Age", "3600"); response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
2.后台Http请求转发
使用HttpClinet转发进行转发(简单的例子 不推荐使用这种方式)
try { HttpClient client = HttpClients.createDefault(); //client对象 HttpGet get = new HttpGet("http://localhost:8080/test"); //创建get请求 CloseableHttpResponse response = httpClient.execute(get); //执行get请求 String mes = EntityUtils.toString(response.getEntity()); //将返回体的信息转换为字符串 System.out.println(mes); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }
3、后台配置同源Cors (推荐)
在SpringBoot2.0 上的跨域 用以下代码配置 即可完美解决你的前后端跨域请求问题
import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.cors.CorsConfiguration; import org.springframework.web.cors.UrlBasedCorsConfigurationSource; import org.springframework.web.filter.CorsFilter; /** * 实现基本的跨域请求 * @author linhongcun * */ @Configuration public class CorsConfig { @Bean public CorsFilter corsFilter() { final UrlBasedCorsConfigurationSource urlBasedCorsConfigurationSource = new UrlBasedCorsConfigurationSource(); final CorsConfiguration corsConfiguration = new CorsConfiguration(); /*是否允许请求带有验证信息*/ corsConfiguration.setAllowCredentials(true); /*允许访问的客户端域名*/ corsConfiguration.addAllowedOrigin("*"); /*允许服务端访问的客户端请求头*/ corsConfiguration.addAllowedHeader("*"); /*允许访问的方法名,GET POST等*/ corsConfiguration.addAllowedMethod("*"); urlBasedCorsConfigurationSource.registerCorsConfiguration("/**", corsConfiguration); return new CorsFilter(urlBasedCorsConfigurationSource); } }
4、使用SpringCloud网关
服务网关(zuul)又称路由中心,用来统一访问所有api接口,维护服务。
Spring Cloud Zuul通过与Spring Cloud Eureka的整合,实现了对服务实例的自动化维护,所以在使用服务路由配置的时候,我们不需要向传统路由配置方式那样去指定具体的服务实例地址,只需要通过Ant模式配置文件参数即可
5、使用nginx做转发
现在有两个网站想互相访问接口 在http://a.a.com:81/A中想访问 http://b.b.com:81/B 那么进行如下配置即可
然后通过访问 www.my.com/A 里面即可访问 www.my.com/B
server { listen 80; server_name www.my.com; location /A { proxy_pass http://a.a.com:81/A; index index.html index.htm; } location /B { proxy_pass http://b.b.com:81/B; index index.html index.htm; } }
如果是两个端口想互相访问接口 在http://b.b.com:80/Api中想访问 http://b.b.com:81/Api 那么进行如下配置即可
使用nginx转发机制就可以完成跨域问题
server { listen 80; server_name b.b.com; location /Api { proxy_pass http://b.b.com:81/Api; index index.html index.htm; } }
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