Httpclient访问服务器

前端：

    /**
 * 调用后台服务
 */
    public static UpdateToolResponseBean callService(String url,UpdateToolRequestBean requestBean,String type) {
        if (url==null||"".equals(url)) {
            logger.error("callService() the url is null, return null!");
            return null;
        }
        String re = null;
        UpdateToolResponseBean respOnseBean= null;
        ObjectMapper objectMapper = JacksonHelper.objectMapper();
        try {
            String requestJsOnStr= objectMapper.writeValueAsString(requestBean);
            re = HttpConnectService.requestByHttpConn(url,requestJsonStr,type);
        } catch (JsonParseException e) {
            e.printStackTrace();
        } catch (JsonMappingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }catch (Exception e) {
            e.printStackTrace();
            logger.error("Server connection failed : "+e);
        }
        if (re != null) {
            try {
                respOnseBean= objectMapper.readValue(re, UpdateToolResponseBean.class);
            } catch (JsonParseException e) {
                e.printStackTrace();
            } catch (JsonMappingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return responseBean;
    }

public static String requestByHttpConn(String url, String reqParms, String type) throws IOException {
        HttpParams httpParams = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpParams, 20 * 1000);
        org.apache.http.client.HttpClient httpclient = new DefaultHttpClient(httpParams);

        HttpPost httppost = new HttpPost(url);      
        List formParams = new LinkedList();

        formParams.add(new BasicNameValuePair("data", reqParms));
        formParams.add(new BasicNameValuePair("type", type));

        HttpEntity entity = new UrlEncodedFormEntity(formParams, "UTF-8");

        httppost.setEntity(entity);

        HttpResponse respOnse= httpclient.execute(httppost);

        logger.debug("statusCode is " + response.getStatusLine().getStatusCode());
        HttpEntity resEntity = response.getEntity();
        logger.debug("----------------------------------------");
        logger.debug(response.getStatusLine());
        if (resEntity != null) {
            logger.debug("返回长度: " + resEntity.getContentLength());
            logger.debug("返回类型: " + resEntity.getContentType());
            InputStream in = resEntity.getContent();
            logger.debug("in is " + in);
            String inS = inputStream2String(in);
            logger.debug(inS);

            return inS;
        }
        return "";
    }

    private static String inputStream2String(InputStream in) throws IOException {
        //这里的编码规则要与上面的相对应
        BufferedReader br = new BufferedReader(new InputStreamReader(in,"UTF-8"));
        String tempbf;
        StringBuffer out = new StringBuffer(4096);
        while ((tempbf = br.readLine()) != null) {
            out.append(tempbf);
        }
        return out.toString();
    }

服务器端：

public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String cOntent= request.getParameter(MsiConstants.KEY_DATA);
        String type = request.getParameter(MsiConstants.DATA_TYPE);
        try {
            doAction(request, response, content, type);
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
        }
    }



void doAction(HttpServletRequest httprequest,HttpServletResponse httpresponse, String content, String type)
        throws Exception{

        UpdateToolRequest requestBean = null;
        JSONObject json = JSONObject.fromObject(content.trim());
        requestBean = (UpdateToolRequest) JSONObject.toBean(json, UpdateToolRequest.class);
        if (logger.isDebugEnabled()) {
            logger.debug(requestBean.toString());
        }
        setRemoteIP("["+httprequest.getRemoteAddr()+"]");
        if (ConstantUtils.MSI_UPDATE_ACTIVATE.equals(type)) {
            response(httpresponse.getWriter(), service.activateClient(requestBean));
        }


    }

public void response(PrintWriter pw, Object response) {
        try {
            JSONObject json = JSONObject.fromObject(response);
            pw.println(json.toString());
        } catch (Exception e) {
            logger.error(" response exception:", e);
            String re = "{'errcode':'" + -1 + "'}";
            pw.println(re);
        }
    }