http请求工具类

import org.apache.log4j.Logger;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.URL;import java.net.URLConnection;

public class HttpTools {

private HttpTools(){}

private static final Logger logger = Logger.getLogger(HttpTools.class);

public static String httpGet(String url,String charset){        logger.debug("发送 http get 请求 , URL : " + url);        String result = "";        BufferedReader in = null;        try {            String urlNameString = url;            URL realUrl = new URL(urlNameString);            URLConnection connection = realUrl.openConnection();            connection.setRequestProperty("accept", "*/*");            connection.setRequestProperty("connection", "Keep-Alive");            connection.connect();            in = new BufferedReader(new InputStreamReader(                    connection.getInputStream(),charset));            String line;            while ((line = in.readLine()) != null) {                result += line;            }        } catch (Exception e) {            logger.error("发送GET请求出现异常！", e);        }        finally {            try {                if (in != null) {                    in.close();                }            } catch (Exception e2) {                logger.error(e2.getMessage(),e2);            }        }        logger.debug("响应报文: " + result);        return result;    }

public static String httpGet(String url){        return httpGet(url,"UTF-8");    }

public static String httpPost(String url, String data){        return httpPost(url, data,"UTF-8");    }

public static String httpPost(String url, String data,String charset){        logger.debug("发送 http post 请求 , URL : " + url);        logger.debug("请求体: " + data);        OutputStream out = null;        BufferedReader in = null;        String result = "";        try {            URL realUrl = new URL(url);            URLConnection conn = realUrl.openConnection();            conn.setRequestProperty("accept", "*/*");            conn.setRequestProperty("connection", "Keep-Alive");            conn.setDoOutput(true);            conn.setDoInput(true);            out = conn.getOutputStream();            out.write(data.getBytes(charset));            out.flush();            in = new BufferedReader(                    new InputStreamReader(conn.getInputStream(),charset));            String line;            while ((line = in.readLine()) != null) {                result += line;            }        } catch (Exception e) {            logger.error("发送 POST 请求出现异常！", e);        }        finally{            try{                if(out!=null){                    out.close();                }                if(in!=null){                    in.close();                }            }            catch(IOException ex){                logger.error(ex.getMessage(),ex);            }        }        logger.debug("响应报文: " + result);        return result;    }

}