jsoup抓取网页报错UnsupportedMimeTypeException

　　今天在用Jsoup爬虫的时候两次遇到下面错误

Exception in thread "main" org.jsoup.UnsupportedMimeTypeException: Unhandled content type. Must be text/*, application/xml, or application/xhtml+xml. Mimetype=application/json;charset=utf-8, URL=http://qiaoliqiang.cn/Exam/user_login.action
    at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:600)
    at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:540)
    at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:227)
    at cn.qlq.craw.Jsoup.JsoupCookieCraw.login(JsoupCookieCraw.java:51)
    at cn.qlq.craw.Jsoup.JsoupCookieCraw.main(JsoupCookieCraw.java:24)

第一次:

代码:

Response res = connect.method(Method.POST).execute();// 执行请求

解决办法:

Response res = connect.ignoreContentType(true).method(Method.POST).execute();// 执行请求

第二次:

代码:

        String url = "http://qiaoliqiang.cn/Exam/user_login.action";
        // 直接获取DOM树
        Document document = Jsoup.connect(url).post();

解决办法:

        // 直接获取DOM树
        Document document = Jsoup.connect(url).ignoreContentType(true).post();