无访问控制允许源 - 跨域

Question

我想访问从 AJAX 查询的服务，但是当我调用此服务时，在控制台浏览器中指示我以下内容：

XMLHttpRequest cannot load http://192.168.108.166:8080/LdapRESTEasy/rest/RESTEasyLdap/login. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access.

我正在使用Apache Tomcat 6并创建一个服务，我在登录时RESTeasy返回带有用户数据的JSON。

我的包含AJAX的javascript代码如下：

function login(){
        var hashNoEnconding = document.getElementById("user").value +'|'+ document.getElementById("pass").value;
        var hashEnconding = base64Encode(hashNoEnconding);
        var url = "http://192.168.108.166:8080/LdapRESTEasy/rest/RESTEasyLdap/login";
        $.ajax({
            url:url,
            type:'POST',
            encoding:"UTF-8",
            headers: {
                "Content-Type":"application/json; charset=UTF-8"
            },
            contentType: "application/json; charset=UTF-8",
            accept: "application/json; charset=UTF-8",
            cacheControl: "no-cache",
            beforeSend: function (request){
                request.setRequestHeader("authorization", hashEnconding);
            },
            success:function (data, status, xhr) {
            },
            error: function (data) {

            }
        });
    }

从 apache tomcat 服务器配置 web.xml建议添加 CORS 过滤器

<filter>
    <filter-name>CORS</filter-name>
    <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class>
    <init-param>
        <param-name>cors.allowOrigin</param-name>
        <param-value>*</param-value>
    </init-param>
    <init-param>
        <param-name>cors.supportedMethods</param-name>
        <param-value>GET, POST, HEAD, PUT, DELETE</param-value>
    </init-param>
    <init-param>
        <param-name>cors.supportedHeaders</param-name>
        <param-value>Content-Type, X-Requested-With, Accept, Authentication, Authorization</param-value>
    </init-param>
    <init-param>
        <param-name>cors.exposedHeaders</param-name>
        <param-value>Set-Cookie</param-value>
    </init-param>
    <init-param>
        <param-name>cors.supportsCredentials</param-name>
        <param-value>false</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>CORS</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

我还在/lib 中添加了 apache 库：

过滤器-1.9.2.jar

java-property-utils-1.9.jar

我已经在互联网上阅读了这个问题，但仍然无法解决

拜托，我能帮我吗？谢谢！！

Answer 1

是的，我找到了解决方案。问题出在错误 500 内部服务器中，它向我表明请求发送的参数未到达服务。与 NULL 相同。我修改服务以接收 GET 并且它有效！