java爬网页中，输出的网页中文全是乱码

 package com.lib;

import java.io.BufferedReader;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;


public class HttpGetUtils {
    public String get(String url){
        String result = "";
        try{
            CloseableHttpClient httpclient = HttpClients.createDefault();
            HttpGet httpget = new HttpGet(url);
            CloseableHttpResponse response = httpclient.execute(httpget);
            try{
                if (response != null && response.getStatusLine().getStatusCode()
                        == HttpStatus.SC_OK ){
                    System.out.println(response.getStatusLine());
                    HttpEntity entity = response.getEntity();
                    System.out.println(entity.getContentEncoding());
                    result = readResponse(entity, "UTF-8");
                }
            }
            finally{
                httpclient.close();
                response.close();
            }

        }
        catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return result;
    }

    public String readResponse(HttpEntity entity, String charset){
        StringBuffer res = new StringBuffer();
        BufferedReader reader = null;
        try{
            if (entity == null){
                return null;
            }
            else{
                reader = new BufferedReader(new InputStreamReader(entity.getContent(),charset));
                String line;
                while ( (line = reader.readLine()) != null){
                    line = line + "\n";
                    res.append(line);
                }
            }
        }
        catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally{
            try{
                if (reader != null){
                    reader.close();
                }

            }
            catch(Exception e){
                e.toString();
            }
        }
        return res.toString();
    }


}

http://871421448.iteye.com/blog/1546950