Java后台发送Post和get请求 （并解决返回值乱码问题）

public class HttpRequest {    /**     * 向指定URL发送GET方法的请求     *      * @param url     *            发送请求的URL     * @param param     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。     * @return URL 所代表远程资源的响应结果     */    public static String sendGet(String url, String param) {        String result = "";        BufferedReader in = null;        try {            String urlNameString = url + "?" + param;            URL realUrl = new URL(urlNameString);            // 打开和URL之间的连接            URLConnection connection = realUrl.openConnection();            // 设置通用的请求属性            connection.setRequestProperty("accept", "*/*");            connection.setRequestProperty("connection", "Keep-Alive");            connection.setRequestProperty("user-agent",                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");            connection.setRequestProperty("Accept-Charset", "utf-8");            connection.setRequestProperty("contentType", "utf-8");            // 建立实际的连接            connection.connect();            // 获取所有响应头字段            Map<String, List<String>> map = connection.getHeaderFields();            // 遍历所有的响应头字段            for (String key : map.keySet()) {             //   System.out.println(key + "--->" + map.get(key));            }            // 定义 BufferedReader输入流来读取URL的响应            in = new BufferedReader(new InputStreamReader(                    connection.getInputStream(),"utf-8"));            String line;            while ((line = in.readLine()) != null) {                result += line;            }        } catch (Exception e) {            System.out.println("发送GET请求出现异常！" + e);            e.printStackTrace();        }        // 使用finally块来关闭输入流        finally {            try {                if (in != null) {                    in.close();                }            } catch (Exception e2) {                e2.printStackTrace();            }        }        return result;    }    /**     * 向指定 URL 发送POST方法的请求     *      * @param url     *            发送请求的 URL     * @param param     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。     * @return 所代表远程资源的响应结果     */    public static String sendPost(String url, String param) {        PrintWriter out = null;        BufferedReader in = null;        String result = "";        try {            URL realUrl = new URL(url);            // 打开和URL之间的连接            URLConnection conn = realUrl.openConnection();            // 设置通用的请求属性            conn.setRequestProperty("accept", "*/*");            conn.setRequestProperty("connection", "Keep-Alive");            conn.setRequestProperty("user-agent",                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");            // 发送POST请求必须设置如下两行            conn.setDoOutput(true);            conn.setDoInput(true);            // 获取URLConnection对象对应的输出流            out = new PrintWriter(conn.getOutputStream());            // 发送请求参数            out.print(param);            // flush输出流的缓冲            out.flush();            // 定义BufferedReader输入流来读取URL的响应            in = new BufferedReader(                    new InputStreamReader(conn.getInputStream()));            String line;            while ((line = in.readLine()) != null) {                result += line;            }        } catch (Exception e) {            System.out.println("发送 POST 请求出现异常！"+e);            e.printStackTrace();        }        //使用finally块来关闭输出流、输入流        finally{            try{                if(out!=null){                    out.close();                }                if(in!=null){                    in.close();                }            }            catch(IOException ex){                ex.printStackTrace();            }        }        return result;    }        public static void main(String[] args) {        //发送 GET 请求       // System.out.println(s);        JcLogEntity f=getJcLogData("10.141.71.251:8080").get(1);        System.out.println(f.getTitle());    }    public static ArrayList<CmsUserInfo> getData(String ipport)    {        System.out.println(ipport);        String s=HttpRequest.sendGet("http://"+ipport+"/spcms/mobile/info/getlist.jspx?pageSize=15&pageNow=1&timeStamp=1431678427563", "");        System.out.println(s);         JSONArray us=JSON.parseObject(s).getJSONArray("data");         ArrayList<CmsUserInfo> al=new ArrayList<CmsUserInfo>();         for(int i=0;i<us.size();i++)         {             String temp=us.get(i).toString();             System.out.println(temp );             CmsUserInfo cui=(CmsUserInfo) JSON.parseObject(temp.replaceAll("GPS","gps"), CmsUserInfo.class);            System.out.println(cui.getGps());             al.add(cui);         }         return al;         //System.out.print(al.size() );    }    public static List<JcLogEntity> getJcLogData(String ipport)    {        System.out.println(ipport);        String s=HttpRequest.sendGet("http://"+ipport+"/spcms/datatransfer/getLog.jspx?pageSize=99999&timeStamp=1431678427563", "");        System.out.println(s);          List<JcLogEntity> re= JSONUtils.jsonToEntityArray(s,JcLogEntity.class);         return re;    }乱码问题解决办法：  connection.setRequestProperty("Accept-Charset", "utf-8");  connection.setRequestProperty("contentType", "utf-8"); in = new BufferedReader(new InputStreamReader(                    connection.getInputStream(),"utf-8"));转自：http://www.aichengxu.com/view/54381