RESTful webservice:如何在 java 中设置标头以接受 Access-Control-Allow-Origin 允许的 XMLHttpRequest

2022-01-15 00:00:00 cors rest java jax-rs jax-ws

我有一个 RESTful 网络服务，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 Web 服务发送请求时:

I have a RESTful webservice which will return string and it was written in Java (JAX-WS). My problem is when I send request to that webservice with URL like :

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

在控制台中，它给了我以下错误消息:

In the console it's giving me the error message below:

XMLHttpRequest 无法加载 url Origin localhost is not allowed通过访问控制允许来源

XMLHttpRequest cannot load url Origin localhost is not allowed by Access-Control-Allow-Origin

我该如何处理这个问题?

How can I handle this issue?

Java 代码:

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

推荐答案

阅读这里关于你的 CORS 问题:http://enable-cors.org/

Read here about your issue CORS : http://enable-cors.org/

检查这是否对您的 getMsg() 方法有帮助:
return Response.ok(output).header("Access-Control-Allow-Origin", "*").build();

Check if this one help you in your getMsg() method:
return Response.ok(output).header("Access-Control-Allow-Origin", "*").build();

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

If above doesn't work try to add Jersey filter to your service. Create filter class:

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;
    }
}

稍后注册 win web.xml:

And register later win web.xml with:

<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>

<小时>另一种解决方案是在资源中使用此代码为浏览器提供 OPTIONS.把它放在你有@GET的类中.

Another solution is to use this code inside your resource to provide OPTIONS for the browser. Put this in the class where you have @GET.

  @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();
  }

<小时>如果这不起作用，请尝试将为Access-Control-Allow-Origin"标头提供的 "*" 与您访问此资源的自定义域交换.举例如果您从 http://localhost::8080 调用它，请使用类似 ("Access-Control-Allow-Origin", "http://localhost:8080")("Access-Control-Allow-Origin", "http://localhost:8080") 而不是星号 "*".

If non of this work, try to exchange the "*" provided for "Access-Control-Allow-Origin" header with your custom domain where you access this resource. I.g. If you call this from http://localhost::8080 use something like this ("Access-Control-Allow-Origin", "http://localhost:8080") instead of asterisk "*".

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