RESTful webservice：如何在java中设置头以接受AccessHttpRequest允许的Access-Control-Allow-Origin [英] RESTful webservice : how to set headers in java to accept XMLHttpRequest allowed by Access-Control-Allow-Origin

问题描述

我有一个RESTful webservice将返回字符串，它是用Java（JAX-WS）编写的。
我的问题是当我发送请求到那个网络服务与URL像：

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

在控制台中给我的错误信息如下：

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

XMLHttpRequest无法加载网址原始本地主机不允许
由Access-Control-Allow-Origin

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

如何处理此问题？

Java代码：

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

推荐答案

： http://enable-cors.org/

检查这个一个帮助你在你的getMsg（）方法：
return Response.ok（output）.header（Access-Control-Allow-Origin，* code>

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

如果以上不工作，尝试添加Jersey过滤器到您的服务。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;
    }
}

p>

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>

---

另一种解决方案是在资源中使用此代码来提供 OPTIONS 。把这放在你有@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();
  }

---

如果没有这项工作，用于访问此资源的自定义域的Access-Control-Allow-Origin标头提供的*例如如果你从 http：// localhost :: 8080 调用这个（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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