java建立url请求获取数据

1、新建工具类

package com.hzc.util;import org.apache.commons.lang3.StringUtils;import org.apache.http.HttpEntity;import org.apache.http.NameValuePair;import org.apache.http.client.config.RequestConfig;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpPost;import org.apache.http.client.utils.HttpClientUtils;import org.apache.http.conn.ssl.SSLConnectionSocketFactory;import org.apache.http.conn.ssl.SSLContextBuilder;import org.apache.http.conn.ssl.TrustStrategy;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;import javax.net.ssl.SSLContext;import java.io.IOException;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.security.KeyManagementException;import java.security.KeyStoreException;import java.security.NoSuchAlgorithmException;import java.security.cert.CertificateException;import java.security.cert.X509Certificate;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class HttpClientUtilsExt {    protected static org.apache.log4j.Logger log = org.apache.log4j.LogManager.getLogger(HttpClientUtilsExt.class);    private HttpClientUtilsExt() {    }    /**     * 使用post方式提交http请求，请求参数默认使用ISO-8859-1编码,需要调用者自己关闭CloseableHttpResponse     *     * @param url    请求地址     * @param params 请求参数     * @return CloseableHttpResponse     * @throws IOException     */    public static CloseableHttpResponse post(String url, Map<String, String> params) throws IOException {        return post(url, params, null);    }    /**     * 使用post方式提交http请求，需要调用者自己关闭CloseableHttpResponse     *     * @param url     请求地址     * @param params  请求参数     * @param charset 请求参数编码     * @return CloseableHttpResponse     * @throws IOException     */    public static CloseableHttpResponse post(String url, Map<String, String> params, String charset) throws IOException {        CloseableHttpClient httpclient = createSSLClientDefault();        HttpPost httpPost = buildHttpPost(url, params, charset);        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(10000)                .setConnectTimeout(10000).build();//设置请求和传输超时时间        httpPost.setConfig(requestConfig);        return httpclient.execute(httpPost);    }    /**     * 构建post请求数据     *     * @param url     * @param params     * @param charset     * @return     * @throws UnsupportedEncodingException     */    private static HttpPost buildHttpPost(String url, Map<String, String> params, String charset) throws UnsupportedEncodingException {        HttpPost httpPost = new HttpPost(url);        if (params == null || params.isEmpty()) {            return httpPost;        }        List<NameValuePair> nvps = new ArrayList<NameValuePair>();        String value = "";        for (String key : params.keySet()) {            value = params.get(key) == null ? "" : params.get(key);            nvps.add(new BasicNameValuePair(key, value));        }        if (charset != null) {            httpPost.setEntity(new UrlEncodedFormEntity(nvps, charset));        } else {            httpPost.setEntity(new UrlEncodedFormEntity(nvps));        }        return httpPost;    }    /**     * 使用post方式提交http请求,注意需要调用者自己关闭流     *     * @param url     请求地址     * @param params  请求参数     * @param charset 参数值的编码格式     * @return InputStream 返回输入流     * @throws IOException     */    public static InputStream postReturnInputStream(String url, Map<String, String> params, String charset) throws IOException {        CloseableHttpResponse response = post(url, params, charset);        return response.getEntity().getContent();    }    /**     * 使用post方式提交http请求,该方法会自己关闭流     *     * @param url     请求地址     * @param params  请求参数     * @param charset 参数值的编码格式     * @return String 返回报文体     * @throws IOException     */    public static String postReturnBodyAsString(String url, Map<String, String> params, String charset) throws IOException {        String content = "";        CloseableHttpResponse response = null;        try {            response = post(url, params, charset);            HttpEntity entity = response.getEntity();            content = EntityUtils.toString(entity);        } catch (Exception e) {            content = e.getMessage();        } finally {            HttpClientUtils.closeQuietly(response);        }        return content;    }    /**     * 使用post方式提交http请求,该方法会自己关闭流     *     * @param url     请求地址     * @param params  请求参数     * @param charset 参数值的编码格式     * @return String 返回报文体     * @throws IOException     */    public static Map<String, String> postReturnBodyAsMap(String url, Map<String, String> params, String charset) throws IOException {        String content = "";        CloseableHttpResponse response = null;        try {            response = post(url, params, charset);            HttpEntity entity = response.getEntity();            content = EntityUtils.toString(entity);        } finally {            HttpClientUtils.closeQuietly(response);        }        return getUrlParams(content);    }    public static Map<String, String> getUrlParams(String param) {        Map<String, String> map = new HashMap<String, String>(0);        if (StringUtils.isBlank(param)) {            return map;        }        String[] params = param.split("&");        for (int i = 0; i < params.length; i++) {            String[] p = params[i].split("=");            if (p.length == 2) {                map.put(p[0], p[1]);            }        }        return map;    }    /**     * 创建信任https协议的请求，若失败则返回默认http协议     *     * @return     */    public static CloseableHttpClient createSSLClientDefault() {        try {            TrustStrategy trustStrategy = new TrustStrategy() {                // 信任所有                public boolean isTrusted(X509Certificate[] chain, String authType)                        throws CertificateException {                    return true;                }            };            SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, trustStrategy)                    .build();            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext);            return HttpClients.custom().setSSLSocketFactory(sslsf).build();        } catch (KeyManagementException e) {            log.error("[member-web][HttpClentUtil][CloseableHttpClient]出现异常:", e);        } catch (NoSuchAlgorithmException e) {            log.error("[member-web][HttpClentUtil][CloseableHttpClient]出现异常:", e);        } catch (KeyStoreException e) {            log.error("[member-web][HttpClentUtil][CloseableHttpClient]出现异常:", e);        }        return HttpClients.createDefault();    }}

2、建立请求

Map<String, String> map = new HashMap<String, String>();map.put("appKey", "691");map.put("orderInfo", "123");String url = "http://127.0.0.1:8080/order/submitOrder.html";String result = HttpClientUtilsExt.postReturnBodyAsString(url, map, "UTF-8");

发送请求使用UTF-8编码方式。