HttpClient 4.5.2例子

1：工具类

package com.app.util;import java.io.IOException;import java.util.ArrayList;import java.util.List;import java.util.Map;import org.apache.http.HttpEntity;import org.apache.http.HttpStatus;import org.apache.http.NameValuePair;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.config.RequestConfig;import org.apache.http.client.entity.EntityBuilder;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;public class HttpClientUtil {    //链接超时时间    private static int connectTimeout = 5000;    //读取超时时间 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用    private static int socketTimeout = 3000;    //设置从connect Manager获取Connection 超时时间    private static int connectionRequestTimeout = 2000;    /**     * http POST发送方式     * @param url     * @param params     * @return     */    public static String httpPost(String url,Map<String, Object> params){        String result = null;        CloseableHttpClient httpClient = HttpClients.createDefault();        HttpPost httpPost = new HttpPost(url);        RequestConfig requestConfig = setRequestConfig();        httpPost.setConfig(requestConfig);        List<NameValuePair> list = getNameValuePair(params);        //将参数拼装到http链接中        EntityBuilder entityBuilder = EntityBuilder.create();        entityBuilder.setParameters(list);        httpPost.setEntity(entityBuilder.build());        CloseableHttpResponse response =  null;        HttpEntity entity = null;        try {            response = httpClient.execute(httpPost);            entity = response.getEntity();            if (response.getStatusLine().getStatusCode() ==             HttpStatus.SC_OK) {                result = EntityUtils.toString(entity, "UTF-8");//将httpEntity转为字符窜            }            EntityUtils.consume(entity);// 清除返回的httpEntity        } catch (ClientProtocolException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                if (response != null) {                    response.close();                }                if (httpClient != null) {                    httpClient.close();                }            } catch (IOException e) {            }        }        return result;    }    /**     * 设置链接时间参数     * @return     */    public static RequestConfig setRequestConfig(){        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(connectTimeout).                setSocketTimeout(socketTimeout).setConnectionRequestTimeout(connectionRequestTimeout).build();        return requestConfig;    }    /**     * 拼装HTTPClient所需参数     * @param params     * @return     */    public static List<NameValuePair> getNameValuePair(Map<String, Object> params){        List<NameValuePair> list = new ArrayList<NameValuePair>(params.size());        for(Map.Entry<String, Object> entry : params.entrySet()){            NameValuePair nameValuePair = new BasicNameValuePair(entry.getKey(), String.valueOf(entry.getValue()));            list.add(nameValuePair);        }        return list;    }}

2：测试类

package com.app.util;import java.util.HashMap;import java.util.Map;import java.util.Map.Entry;import com.base.util.JackSonSerializeUtil;public class Test {    public static void main(String[] args) {        String url="http://localhost:8080/app/app/system/login";        Map<String, Object> params = new HashMap<String, Object>();        params.put("loginName", "admin");        params.put("password", "111111");        String result = HttpClientUtil.httpPost(url, params);        Map<String, String> map = (Map<String, String>) JackSonSerializeUtil.JsonToObject(result, Map.class);        for (Entry<String, String> m: map.entrySet()) {        }        System.out.println(result+"  result");    }}

3：调用的方法

@HandleMethodLog("用户登录")    @RequestMapping(value="/login",method=RequestMethod.POST)    @ResponseBody    public String login(HttpServletRequest request,HttpServletResponse response) throws Exception{        logger.debug("登录：login");        CommonAjax<SysUser> ajax = new CommonAjax<SysUser>();        SysUser user = sysUserService.getSysUser(new RequestToMap().getRequestToMap(request));        if(user!=null){            request.getSession().setAttribute(CommonConstant.SESSION_USER, user);            user.setLastLoginTime(CommonUtil.getNowDate());            sysUserService.updateUserByEntity(user);            ajax.setState(CommonUtil.SUCCESS);            ajax.setObject(user);            ajax.setContent("登录成功");        }else{            ajax.setState(CommonUtil.NOTPASSERROR);            ajax.setContent("登录失败");        }        return JackSonSerializeUtil.ObjectToJson(ajax);    }