RESTful webservice:如何在java中设置头文件以接受Access-Control-Allow-Origin允许的XMLHttpRequest

Question

我有一个RESTful webservice,它将返回字符串,它是用Java(JAX-WS)编写的.我的问题是当我使用以下URL向该webservice发送请求时:

http://localhost:8080/project/webservices/getlist/getListCustomers

在控制台中,它给出了以下错误消息:

XMLHttpRequest无法加载url Access-Control-Allow-Origin不允许使用origin localhost

我该如何处理这个问题？

Java代码:

@GET
@Path("/getsample")
public Response getMsg() { 
    String output = "Jersey say : " ;   
    return Response.status(200).entity(output).build();
}

Answer 1

在这里阅读有关您的问题CORS:http://enable-cors.org/

检查这个是否可以帮助您使用getMsg()方法:
return Response.ok(output).header("Access-Control-Allow-Origin", "*").build();

如果上述方法无效,请尝试将Jersey过滤器添加到您的服务中.创建过滤器类:

package your.package;

public class CORSFilter implements ContainerResponseFilter {

    @Override
    public ContainerResponse filter(ContainerRequest creq, ContainerResponse cresp) {

        cresp.getHttpHeaders().putSingle("Access-Control-Allow-Origin", "*");
        cresp.getHttpHeaders().putSingle("Access-Control-Allow-Credentials", "true");
        cresp.getHttpHeaders().putSingle("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT, OPTIONS, HEAD");
        cresp.getHttpHeaders().putSingle("Access-Control-Allow-Headers", "Content-Type, Accept, X-Requested-With");

        return cresp;
    }
}

并在以后注册win web.xml:

<servlet>
<servlet-name>CORS Filter</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
 <init-param>
    <param-name>com.sun.jersey.spi.container.ContainerResponseFilters</param-name>
    <param-value>your.package.CORSFilter</param-value>
 </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>CORS Filter</servlet-name>
    <url-pattern>/webservices/*</url-pattern>
</servlet-mapping>

另一种解决方案是在资源中使用此代码来提供OPTIONS浏览器.把它放在你拥有@GET的班级里.

  @OPTIONS
  @Path("/getsample")
  public Response getOptions() {
    return Response.ok()
      .header("Access-Control-Allow-Origin", "*")
      .header("Access-Control-Allow-Methods", "POST, GET, PUT, UPDATE, OPTIONS")
      .header("Access-Control-Allow-Headers", "Content-Type, Accept, X-Requested-With").build();
  }

如果不是这项工作,请尝试将您"*"提供的"Access-Control-Allow-Origin"标头与您访问此资源的自定义域进行交换.Ig如果你http://localhost::8080用这样的东西("Access-Control-Allow-Origin", "http://localhost:8080")而不是星号来调用它"*".