httpClient工具类

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httpClient

后台中使用http发送请求时需要用到httpclient
一般用到的有post和get两种请求方式，post发送形式有两种:
setRequestBody()和setRequestEntity()两者之间的区别，请读者各自查阅资料
get发送参数，是将参数以key=value的形式拼接到url后面
get的请求参数的大小和浏览器有关
主要用commons-httpclient-3.1的jar包，用maven方式获取:

<dependency>    <groupId>commons-httpclient</groupId>    <artifactId>commons-httpclient</artifactId>    <version>3.1</version> </dependency>

记录日志用到:org.slf4j

post setRequestBody()方式
PostMethod postMethod = new PostMethod(url);
postMethod.setRequestBody(nameValuePair);
post setRequestEntity()方式
PostMethod postMethod = new PostMethod(url);
postMethod.setRequestEntity(new StringRequestEntity(postParam, “”, “UTF-8”));
get 发送请求
url += “?” + getParam;
getMethod = new GetMethod(url);

详见代码

package com.xxx.util;import net.sf.json.JSONSerializer;import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;import org.apache.commons.httpclient.HttpClient;import org.apache.commons.httpclient.NameValuePair;import org.apache.commons.httpclient.methods.GetMethod;import org.apache.commons.httpclient.methods.PostMethod;import org.apache.commons.httpclient.methods.StringRequestEntity;import org.apache.commons.httpclient.params.HttpConnectionParams;import org.apache.commons.httpclient.params.HttpMethodParams;import org.apache.commons.lang.StringUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.*;import java.util.HashMap;import java.util.Map;/** * http请求工具类 * @author weiQiang * @date 2017/7/28 * @email 1107438082@qq.com */public class HttpClientUtils {    private static Logger logger = LoggerFactory.getLogger(HttpClientUtils.class);    public static final int timeout = 10 * 1000;    /**     * post请求     *     * @param url   url     * @param param 请求参数     * @return     */    public static String httpPostClientServer(String url, Map<String, String> param) {        return httpClientServer(url, param, true, timeout, true);    }    /**     * post请求     *     * @param url     url     * @param param   请求参数     * @param timeout 超时时间     * @return     */    public static String httpPostClientServer(String url, Map<String, String> param, Integer timeout) {        return httpClientServer(url, param, true, timeout, true);    }    /**     * post请求     *     * @param url           url     * @param param         请求参数     * @param postParamType 发送post请求是否使用setRequestEntity默认为true，false为postParamType方式     * @return     */    public static String httpPostClientServer(String url, Map<String, String> param, boolean postParamType) {        return httpClientServer(url, param, true, timeout, postParamType);    }    /**     * post请求     *     * @param url           url     * @param param         请求参数     * @param timeout       超时时间     * @param postParamType 发送post请求是否使用setRequestEntity默认为true，false为postParamType方式     * @return     */    public static String httpPostClientServer(String url, Map<String, String> param, Integer timeout, boolean postParamType) {        return httpClientServer(url, param, true, timeout, postParamType);    }    /**     * get请求     *     * @param url   url     * @param param 请求参数     * @return     */    public static String httpGetClientServer(String url, Map<String, String> param) {        return httpClientServer(url, param, false, timeout);    }    /**     * get请求     *     * @param url     url     * @param param   请求参数     * @param timeout 超时时间     * @return     */    public static String httpGetClientServer(String url, Map<String, String> param, Integer timeout) {        return httpClientServer(url, param, false, timeout);    }    /**     * 发送请求     *     * @param url         url     * @param param       请求参数     * @param requestType 是否为post     * @param timeout     超时时间     * @return     */    public static String httpClientServer(String url, Map<String, String> param, boolean requestType, Integer timeout) {        return httpClientServer(url, param, requestType, timeout, false);    }    /**     * 发送http请求     *     * @param url           url     * @param param         请求参数     * @param requestType   是否为post     * @param timeout       超时时间     * @param postParamType post请求参数类型 发送post请求是否使用setRequestEntity默认为true，false为postParamType方式     * @return     */    public static String httpClientServer(String url, Map<String, String> param, boolean requestType, Integer timeout, boolean postParamType) {        long beginTime = System.currentTimeMillis();        String result = "";        if (null == param) {            param = new HashMap<>();        }        logger.info("请求url:{},发送:{}请求,请求大小:{}条", url, requestType ? "post" : "get", param.size());        if (StringUtils.isBlank(url)) {            result = "请求url为空";            return result;        }        if(!url.startsWith("http://")){            url="http://"+url;        }        HttpClient httpClient = new HttpClient();        PostMethod postMethod = null;        GetMethod getMethod = null;        InputStream inputStream = null;        if (requestType) {//post请求            postMethod = new PostMethod(url);            httpClient.getParams().setIntParameter(HttpConnectionParams.CONNECTION_TIMEOUT, timeout);            NameValuePair[] nameValuePair = new NameValuePair[param.size()];            final int[] i = {0};            param.forEach((key, value) -> {                nameValuePair[i[0]] = new NameValuePair(key, value);                i[0]++;            });            try {                //一般接口用以上setRequestBody方法可以接受到值,但是有一些旧接口适用于setRequestEntity的方式接受post参数                if (postParamType) {                    postMethod.setRequestBody(nameValuePair);                } else {                    String postParam = JSONSerializer.toJSON(param).toString();                    if (StringUtils.isNotBlank(postParam)) {                        postMethod.setRequestEntity(new StringRequestEntity(postParam, "", "UTF-8"));                    }                }                postMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());                postMethod.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "UTF-8");                httpClient.executeMethod(postMethod);                inputStream = postMethod.getResponseBodyAsStream();            } catch (IOException e) {                logger.error("请求发生错误:{}", e.getMessage());            } catch (Exception e) {                logger.error("请求发生错误:{}", e.getMessage());            }        } else {//get请求            StringBuffer getParamBuffer = new StringBuffer();            param.forEach((key, value) -> getParamBuffer.append(key).append("=").append(value).append("&"));            if (null != getParamBuffer && getParamBuffer.length() > 0) {                getParamBuffer.deleteCharAt(getParamBuffer.length() - 1);            }            String getParam = getParamBuffer.toString();            url += "?" + getParam;            logger.info("Get请求url:{}", url);            getMethod = new GetMethod(url);            getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());            getMethod.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "UTF-8");            try {                httpClient.executeMethod(getMethod);                inputStream = getMethod.getResponseBodyAsStream();            } catch (IOException e) {                logger.error("请求发生错误:{}", e.getMessage());            } catch (Exception e) {                e.printStackTrace();                logger.error("请求发生错误:{}", e.getMessage());            }        }        try {            if (null == inputStream) {                return result;            }            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));            StringBuilder stringBuilder = new StringBuilder();            String line = "";            while (null != (line = bufferedReader.readLine())) {                stringBuilder.append(line);            }            result = stringBuilder.toString();        } catch (UnsupportedEncodingException e) {            logger.error("请求发生UnsupportedEncodingException错误:{}", e.getMessage());        } catch (IOException e) {            logger.error("请求发生错误:{}", e.getMessage());        } catch (Exception e) {            logger.error("请求发生错误:{}", e.getMessage());        } finally {            //释放连接            if (null != postMethod) {                postMethod.releaseConnection();            }            if (null != getMethod) {                getMethod.releaseConnection();            }        }        logger.info("请求结果大小:{}", result.length());        long endTime = System.currentTimeMillis();        logger.info("请求耗时:{}ms",(endTime-beginTime));        return result;    }}

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