Java后台发送Post和get请求

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://blog.youkuaiyun.com/gzdxrenmin/article/details/50599456