java UrlConnection 模拟浏览器请求出错java.io.IOException:Server returned HTTP response code: 500

500是服务器端出错 你有设置头部信息吗 conn.setRequestProperty("ContentType","text/xml;charset=utf-8"); 我的代码 HttpURLConnection conn = (HttpURLConnection)new URL(url).openConnection(); conn.setDoInput(true); conn.setDoOutput(true);