无法在 JavaScript 中向 Java Web 服务(球衣)发出 CORS POST 请求? [英] Unable to make CORS POST request in javascript to java web service(jersey)?
问题描述
我正在使用 Jersey 在 Java Web 服务中实现跨资源源共享.我创建的资源如下:
I am implementing Cross Resource Origin Sharing in Java Web services using Jersey.I created resource as followes:
@POST
@Path("/getSubjects")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Response getSubjects(TokenCheck tc) throws IOException, ServletException{
String token = tc.getToken();
String result = "";
if(!token.equals("") && !token.equals(null)){
context.getRequestDispatcher("/GetSubjectsWs?token="+token).include(request, response);
String subs = request.getAttribute("subjects").toString();
result = "{"subjects":""+subs+""}";
}else {
result = "{"subjects":"['Invalid Token login again']"}";
}
JSONObject j = null;
try {
j = new JSONObject(result);
} catch (JSONException e) {
e.printStackTrace();
}
return Response.status(200).entity(j).header("Access-Control-Allow-Origin", "*").header("Access-Control-Allow-Methods", "POST, GET, OPTIONS").header("Access-Control-Allow-Headers", "Content-Type:application/json").build();
}
并使用 javascript 作为发布请求:
and making post request using javascript as :
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript Client</title>
<script type="text/javascript">
function restReq() {
var url = "http://localhost:8888/WebservicesServer/restful/getserver/getSubjects";
var json = {
"token":"8495C211F11C9B18E6651E03EB2995BC"
};
var client = new XMLHttpRequest();
client.open("POST", url, true);
client.setRequestHeader("Access-Control-Request-Methods", "POST");
client.setRequestHeader("Content-Type", "application/json");
client.send(json);
client.onreadystatechange = function() {
if (client.readyState == 4) {
if ( client.status == 200)
console.log("success: " + client.responseText);
else
console.log("error: " +client.status+" "+ client.responseText);
}
};
}
</script>
</head>
<body>
<input type="button" value="getSubjects" onclick="restReq();">
</body>
</html>
当我单击 chrome 中的 getSubjects 按钮时，我收到 错误:XMLHttpRequest 无法加载 ..localhost:8888/WebservicesServer/restful/getserver/getSubjects.Access-Control-Allow-Origin 不允许 Origin null.但我可以通过 GET 请求得到响应，问题在于 POST 请求我的浏览器 url file:///E:/Documents%20and%20Settings/Srinivas/Desktop/wars/JSClient2.html(文件系统)我尝试了很多方法，比如设置原点等，仍然无法得到 json 响应(服务器是 Tomcat 7)请帮助解决这个问题.
When i clicked getSubjects Button in chrome I am getting error as : XMLHttpRequest cannot load ..localhost:8888/WebservicesServer/restful/getserver/getSubjects. Origin null is not allowed by Access-Control-Allow-Origin. But i am able to get response with GET request,problem is with POST request my browser url file:///E:/Documents%20and%20Settings/Srinivas/Desktop/wars/JSClient2.html (File system) I tried in many ways like by setting origin etc, still unable to get json response (Server is Tomcat 7) please help to overcome this problem.
推荐答案
如果你正在使用 CORS，那么你应该将它作为一个过滤器来实现，而不是试图将它嵌入到每个资源的每个方法中.这是一个简单的示例(如果您担心，您可能需要调整设置以限制它):
If you are using CORS then you should implement it as a filter rather than attempt to embed it in every method of every resource. Here's a simple example (you might want to tweak the settings to restrict it if that's of concern to you):
import com.sun.jersey.spi.container.ContainerRequest;
import com.sun.jersey.spi.container.ContainerResponse;
import com.sun.jersey.spi.container.ContainerResponseFilter;
/**
* Filter to handle cross-origin resource sharing.
*/
public class CORSFilter implements ContainerResponseFilter
{
private static final String ORIGINHEADER = "Origin";
private static final String ACAOHEADER = "Access-Control-Allow-Origin";
private static final String ACRHHEADER = "Access-Control-Request-Headers";
private static final String ACAHHEADER = "Access-Control-Allow-Headers";
public CORSFilter()
{
}
@Override
public ContainerResponse filter(final ContainerRequest request, final ContainerResponse response)
{
final String requestOrigin = request.getHeaderValue(ORIGINHEADER);
response.getHttpHeaders().add(ACAOHEADER, requestOrigin);
final String requestHeaders = request.getHeaderValue(ACRHHEADER);
response.getHttpHeaders().add(ACAHHEADER, requestHeaders);
return response;
}
}
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