我很菜，不是最有经验的JAVA用户，但是我遇到了一些麻烦。
每次执行以下代码时，都会收到以下错误：
java.util.zip.ZipException: Not in GZIP format
at java.util.zip.GZIPInputStream.readHeader(Unknown Source)
at java.util.zip.GZIPInputStream.(init)(Unknown Source)
at java.util.zip.GZIPInputStream.(init)(Unknown Source)
at DidYouMean.executeGet(DidYouMean.java:56)
at DidYouMean.didYouMean(DidYouMean.java:11)
at DidYouMean.main(DidYouMean.java:39)
Exception in thread "main" java.lang.IllegalArgumentException: String input must not be null....
我的一个朋友（使用 Mac，而不是我使用 Windows 7 64）能够执行该程序。因此，似乎这不是代码本身的问题（反正这个代码是由 Github 上的某人开发的）。我真的很感激任何帮助！ 即使错误并不罕见，但我寻找解决方案的过程并不十分成功。
import java.io.*;
import java.net.*;
import org.jsoup.*;
import java.util.zip.*;
import org.jsoup.nodes.*;
import org.jsoup.examples.HtmlToPlainText;
public class DidYouMean {
public static String didYouMean(String s){
String word="";
String url="http://www.google.co.in/search?hl=en&q="+URLEncoder.encode(s);
String html=executeGet(url,"www.google.co.in",'i');
Document content=Jsoup.parse(html);
Element submitted=null;
try{
submitted=content.getElementById("topstuff").clone();
HtmlToPlainText h=new HtmlToPlainText();
word=h.getPlainText(submitted);
int q,p=word.indexOf("Did you mean:");
if(p>=0){
word=word.substring(p+"Did you mean:".length());
p=word.indexOf("<>");
if(p>0) word=word.substring(0,p);
word=word.trim();
}
else{
p=word.indexOf("Showing results for");
if(p>=0){
word=word.substring(p+"Showing results for".length());
p=word.indexOf("<>");
if(p>0) word=word.substring(0,p);
word=word.trim();
}
else return "No results";
}
}catch(Exception e){e.printStackTrace();}
return word;
}
public static void main(String args[]){
System.out.println(didYouMean(args[0]));
}
public static String executeGet(String targetURL,String host,char ch){
URL url;
HttpURLConnection connection=null;
try{
url=new URL(targetURL);
connection=(HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.setRequestProperty("Host",host);
connection.setRequestProperty("Accept-Encoding", "gzip,deflate,sdch");
connection.setRequestProperty("Accept-Language","en-US,en;q=0.8");
if(ch=='c') connection.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.52 Safari/536.5");
if(ch=='i') connection.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; ShopperReports 3.1.22.0; SRS_IT_E879047EB0765B5336AF90)");
connection.setUseCaches (false);
connection.setDoInput(true);
connection.setDoOutput(true);
GZIPInputStream gzis=new GZIPInputStream(connection.getInputStream());
InputStreamReader reader=new InputStreamReader(gzis);
BufferedReader in=new BufferedReader(reader);
String line;
StringBuffer response=new StringBuffer();
while((line=in.readLine())!=null) {
response.append(line);
response.append('\r');
}
in.close();
return response.toString();
} catch (Exception e) {e.printStackTrace();return null;}
}
}