使用Jsoup加代理发送get请求

public static String get(String uri){

System.setProperty("https.proxySet", "true");
System.getProperties().put("https.proxyHost", ip);
System.getProperties().put("https.proxyPort", port);

Document doc = null;
String  agent="Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)"
+ "  Chrome/56.0.2924.87 Safari/537.36" ;
try {
doc = Jsoup.connect(uri).ignoreContentType(true)
.userAgent(agent)
// ignoreHttpErrors
//这个很重要 否则会报HTTP error fetching URL. Status=404
.ignoreHttpErrors(true)  //这个很重要
.timeout(3000).get();
} catch (IOException e) {
System.out.println(e.getMessage()+"  **************** get");
}
if (doc!=null) {
return doc.body().text();
}
return null;
}