来自jax-rs Web服务的Ajax请求 [英] Ajax request from jax-rs web service

问题描述

从我的tomcat Web服务发送发帖请求时，出现以下错误: 对预检请求的响应未通过访问控制检查:所请求的资源上没有'Access-Control-Allow-Origin'标头.因此，不允许访问源'null'."

While sending a post request from my tomcat web service i got an error as below: " Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access."

我正在使用tomcat 9. *，并使用jax-rs Java Web api开发了我的Web服务.

I'm using tomcat 9.* and developed my web service with jax-rs java web api.

虽然我已经用邮递员测试了我的Web服务，但是我的Web服务获得了很好的响应(http 200响应).但是，当我尝试发送ajax发布请求时，我收到了上面的消息.我试图启用CORS筛选器，并尝试发送可以正常工作的get请求.

While i have tested my web service with postman, i got a good response from my web service (http 200 response). Yet, when i tried to send ajax post request i got the message above. I tried to enable the CORS filter and tried to send get request that working fine..

web.xml:

    <filter>
    <filter-name>CorsFilter</filter-name>
    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class> 
    </filter>
    <filter-mapping>
    <filter-name>CorsFilter</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>FORWARD</dispatcher>
    </filter-mapping>'

jax-rs post函数:

the jax-rs post function:

    @POST
    @Path("/users2")    
    @Consumes("application/json")
    @Produces(MediaType.APPLICATION_JSON)
    public Response SetAllTlcsStatus(List<TrafficLight> c){       
    System.out.println("You have entered the SetTlc function");
    return Response.ok() //200
            .header("Access-Control-Allow-Origin", "*")
            .header("Access-Control-Allow-Methods", "GET, POST, DELETE, 
    PUT")
            .allow("OPTIONS").build();
    }  

ajax请求:

    $.ajax({
    type : "POST",
    url : "http://localhost:8080/userManagement/rest/Traffic/users2",
    contentType :"application/json; charSet=UTF-8",
    data : d,
    dataType : "json",
    beforeSend: function (xhr){ 
        console.log('Before');
        xhr.setRequestHeader('Authorization', make_base_auth(user, pass)); 
    }'

推荐答案

您说:我尝试启用CORS过滤器，并尝试发送 get 正常工作的请求."

You say "I tried to enable the CORS filter and tried to send get request that working fine."

您是说GET方法有效但POST无效吗?如果是这样，则必须在REST服务/终端以及这些设置上允许它 标头("Access-Control-Allow-Origin"，"*") 标头("Access-Control-Allow-Methods"，"GET，POST，DELETE，PUT")

Do you mean that GET method works but POST not? If so you must allow it on your REST service/terminal and also these settings header("Access-Control-Allow-Origin", "*") header("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT")

最后，如果您的AJAX仍然有返回失败的尝试，请尝试

Finally, if by any chance your AJAX still returns failed try

$.ajax({
    type : "POST",
    url : "http://localhost:8080/userManagement/rest/Traffic/users2",
    contentType :"application/json; charSet=UTF-8",
    data : d,
    dataType : "json",
**xhrFields: {
    withCredentials: true
},
crossDomain: true,**
beforeSend: function (xhr){ 
        console.log('Before');
        xhr.setRequestHeader('Authorization', make_base_auth(user, pass)); 
    }'

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