JAVA访问url获取结果

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.Map;

import org.apache.log4j.Logger;

/**
 * @描述: 
 * @作者: nie
 * @版本: 1.0
 * @创建日期: 2017年12月6日
 * @创建时间: 下午3:01:49
 */
public class RequestHelper {
    
    private static Logger logger = Logger.getLogger(RequestHelper.class);
    
    /**
     * @描述: 
     * @作者: nie
     * @时间: 2017年12月7日 下午7:29:52
     * @param url
     * @return
     */
    public static Map<String, String> getResultMapForQQ(String url) {
        String urlRsStr = getResultOfString(url, "utf-8");
        
        //QQ返回错误的结果以callback(json)的形式
        if ( urlRsStr.startsWith("callback") ) {
            urlRsStr = urlRsStr.replace("callback(", "");
            urlRsStr = urlRsStr.substring(0, urlRsStr.length() - 2);
        }
        
        String jsonStr = "";
        //将"key=val,key=val"的字段转成json（需更换正则匹配）
        if ( !urlRsStr.trim().startsWith("{") ) {
            String[] arr = urlRsStr.split("&");
            StringBuffer temp = new StringBuffer("{");
            for (int i = 0; i < arr.length; i++) {
                String[] arr2 = arr[i].split("=");
                temp.append("\"").append(arr2[0]).append("\":").append("\"").append(arr2[1]).append("\",");
                if ( i == arr.length - 1 ) {
                    temp = new StringBuffer(temp.toString().substring(0, temp.length() - 1));
                    temp.append("}");
                }
            }
            jsonStr = temp.toString();
        }
        
        if ( StringHelper.isEmpty(jsonStr) )
            return null;
        return (Map<String, String>) JsonHelper.getObjectByJSON(jsonStr);
    }
    
    /**
     * @描述: 获取webservice结果字符串，默认utf-8编码读取
     * @作者: nie
     * @时间: 2017年12月6日 下午3:17:43
     * @param url
     * @return
     */
    public static String getResultOfString(String url) {
        return getResultOfString(url, "utf-8");
    }
    
    /**
     * @描述: 获取webservice结果字符串
     * @作者: nie
     * @时间: 2017年12月6日 下午3:17:43
     * @param url,character
     * @return
     */
    public static String getResultOfString(String url, String character) {
        //1.创建URL对象，打开URL连接，并保存InputStream对象
        URL urlObj = null;
        HttpURLConnection conn = null;
        InputStream in = null;
        try {
            urlObj = new URL(url);
            conn = (HttpURLConnection) urlObj.openConnection();
            conn.setDoInput(true);
            conn.setRequestMethod("GET");
            conn.setRequestProperty("Accept", "*/*");
            conn.setRequestProperty("User-Agent", "Profile/MIDP-2.0 Configuration/CLDC-1.0");
            conn.setRequestProperty("Content-Language", "en-US");
            conn.setRequestProperty("Accept-Language", "zh-CN");
            conn.setRequestProperty("Content-type", "text/html");
            conn.connect();
            in = conn.getInputStream();
        }
        catch (UnknownHostException e) {
            logger.error("地址解析失败，返回\"\"！错误信息：" + e);
            return "";
        }
        catch (Exception e) {
            logger.error("获取webService失败，返回\"\"！错误信息：" + e);
            return "";
        }
        finally {
            if ( null != urlObj )
                urlObj = null;
            if ( null != conn )
                conn = null;
        }
        
        //2.读取返回的InputStream
        StringBuffer sb = new StringBuffer();
        if ( null == in ) {
            return "";
        }
        InputStreamReader isreader = null;
        try {
            isreader = new InputStreamReader(in, character);
        }
        catch (UnsupportedEncodingException e) {
            logger.error("编码解析失败，返回\"\"！错误信息：" + e);
            return "";
        }
        
        BufferedReader bufferedRead = new BufferedReader(isreader);
        String temp = null;
        try {
            while ((temp = bufferedRead.readLine()) != null)
                sb.append(temp);
        }
        catch (Exception e) {
            logger.error("读取流失败，返回\"\"！错误信息：" + e);
            return "";
        }
        finally {
            if ( null != isreader ) {
                try {
                    isreader.close();
                }
                catch (IOException e) {
                    logger.error("关闭InputStreamReader失败！" + e);
                }
                isreader = null;
            }
            if ( null != bufferedRead ) {
                try {
                    bufferedRead.close();
                }
                catch (IOException e) {
                    logger.error("关闭BufferedReader失败！" + e);
                }
                bufferedRead = null;
            }
            if ( null != in ) {
                try {
                    in.close();
                }
                catch (IOException e) {
                    logger.error("关闭inputStream失败！" + e);
                }
                in = null;
            }
        }
        
        return sb.toString();
    }
}