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:
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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 {
}
}
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在web.xml中需要添加如下配置:
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< 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 >
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为单个方法提供跨域访问,直接添加请求头:
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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" );
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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)
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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();
}
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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
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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);
}
}
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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
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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;
}
}
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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
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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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原文链接:https://blog.csdn.net/qq_37651267/article/details/93367870