如何使用jQuery加载跨域html

Question

我有两个不同的java web项目在两个不同tomcat服务器上运行。比方说projA和projB在这里，我试图从projA加载projB中可用的html。我只是简单地使用jQuery.load（）来实现这一点。但它在请求的资源错误中没有"Access Control Allow Origin"标头。我还尝试在这里使用jquery跨域插件https://github.com/padolsey-archive/jquery.fn/tree/master/cross-domain-ajax

但这并不奏效。任何帮助都将不胜感激。

代码我正在尝试

$191('.ontop').load("http://"+host+":8080/OtherDomain/",function(response,status) 
{
    if (status == "error") 
    {
        $191('.ontop').empty();
        var msg = "Sorry We could not connect to our server.. Please try again later.";
        alert(msg);
    }
    else
    {
        alert(status);
        $191('.ontop').css('display', 'block');
    }
});

Answer 1

您可能需要使用代理服务器进行请求。

我找到了Here并制作了这把小提琴http://jsfiddle.net/2kn52u3s/1

代码片段-

设置ajax头-

$.ajaxSetup({
    scriptCharset: "utf-8", //maybe "ISO-8859-1"
    contentType: "application/json; charset=utf-8"
});

然后以-的形式请求跨域JSON请求

$.getJSON('http://whateverorigin.org/get?url=' + 
    encodeURIComponent('http://google.com') + '&callback=?',
    function(data) {
      $("#target").html(data.contents);
});

Answer 2

所以这里是我得到的CORS错误的答案：

我在web.xml 中添加了以下过滤器

 <filter>   
      <filter-name>myResponseFilter</filter-name>
      <filter-class>com.filters.ResponseHeaderFilter</filter-class>
      <async-supported>true</async-supported>
    </filter>

    <filter-mapping>
        <filter-name>myResponseFilter</filter-name>     
        <url-pattern>*</url-pattern>
    </filter-mapping>

然后有一个自定义的过滤器写入设置标题：

public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResp = (HttpServletResponse) response;      
        String origin = httpRequest.getHeader("origin");
        origin = (origin == null) ? "*" : origin;
        httpResp.setHeader("Access-Control-Allow-Origin", origin);
        httpResp.setHeader("Access-Control-Allow-Methods", "GET, POST");
        httpResp.setHeader("Access-Control-Allow-Credentials", "true");
        httpResp.setHeader("Access-Control-Allow-Headers", "x-requested-with, Content-Type");
        httpResp.setHeader("Access-Control-Max-Age", "86400");
        filterChain.doFilter(request, response);
    }