Java中怎么調(diào)用第三方接口示范

本篇文章給大家分享的是有關(guān)Java中怎么調(diào)用第三方接口示范，小編覺得挺實(shí)用的，因此分享給大家學(xué)習(xí)，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。

使用流程

【1】準(zhǔn)備工作：在項(xiàng)目的工具包下導(dǎo)入HttpClientUtil這個(gè)工具類，或者也可以使用Spring框架的restTemplate來調(diào)用，上面有調(diào)用接口的方法【分為Get和Post方式的有參和無參調(diào)用】：

package com.njsc.credit.util; import java.io.IOException;import java.net.URI;import java.util.ArrayList;import java.util.List;import java.util.Map; import org.apache.http.NameValuePair;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.client.utils.URIBuilder;import org.apache.http.entity.ContentType;import org.apache.http.entity.StringEntity;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 { /** * 帶參數(shù)的get請求 * @param url * @param param * @return String */public static String doGet(String url, Map<String, String> param) {// 創(chuàng)建Httpclient對象CloseableHttpClient httpclient = HttpClients.createDefault(); String resultString = "";CloseableHttpResponse response = null;try {// 創(chuàng)建uriURIBuilder builder = new URIBuilder(url);if (param != null) {for (String key : param.keySet()) {builder.addParameter(key, param.get(key));}}URI uri = builder.build();// 創(chuàng)建http GET請求HttpGet httpGet = new HttpGet(uri);// 執(zhí)行請求response = httpclient.execute(httpGet);// 判斷返回狀態(tài)是否為200if (response.getStatusLine().getStatusCode() == 200) {resultString = EntityUtils.toString(response.getEntity(), "UTF-8");}} catch (Exception e) {e.printStackTrace();} finally {try {if (response != null) {response.close();}httpclient.close();} catch (IOException e) {e.printStackTrace();}}return resultString;}/** * 不帶參數(shù)的get請求 * @param url * @return String */public static String doGet(String url) {return doGet(url, null);} /** * 帶參數(shù)的post請求 * @param url * @param param * @return String */public static String doPost(String url, Map<String, String> param) {// 創(chuàng)建Httpclient對象CloseableHttpClient httpClient = HttpClients.createDefault();CloseableHttpResponse response = null;String resultString = "";try {// 創(chuàng)建Http Post請求HttpPost httpPost = new HttpPost(url);// 創(chuàng)建參數(shù)列表if (param != null) {List<NameValuePair> paramList = new ArrayList<>();for (String key : param.keySet()) {paramList.add(new BasicNameValuePair(key, param.get(key)));}// 模擬表單UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);httpPost.setEntity(entity);}// 執(zhí)行http請求response = httpClient.execute(httpPost);resultString = EntityUtils.toString(response.getEntity(), "utf-8");} catch (Exception e) {e.printStackTrace();} finally {try {response.close();} catch (IOException e) {e.printStackTrace();}}return resultString;} /** * 不帶參數(shù)的post請求 * @param url * @return String */public static String doPost(String url) {return doPost(url, null);}/** * 傳送json類型的post請求 * @param url * @param json * @return String */public static String doPostJson(String url, String json) {// 創(chuàng)建Httpclient對象CloseableHttpClient httpClient = HttpClients.createDefault();CloseableHttpResponse response = null;String resultString = "";try {// 創(chuàng)建Http Post請求HttpPost httpPost = new HttpPost(url);// 創(chuàng)建請求內(nèi)容StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);httpPost.setEntity(entity);// 執(zhí)行http請求response = httpClient.execute(httpPost);resultString = EntityUtils.toString(response.getEntity(), "utf-8");} catch (Exception e) {e.printStackTrace();} finally {try {response.close();} catch (IOException e) {e.printStackTrace();}}return resultString;}}

【2】創(chuàng)建url和訪問key 以及參數(shù)等：

代碼如下：

/** * 聚合接口校驗(yàn)身份證 * @param idCard * @param realName * @return boolean */public boolean identityCheck(String idCard, String realName){logger.info("-----------------調(diào)用聚合數(shù)據(jù) 身份證驗(yàn)證API BEGIN--------------->");String key = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";String url = "http://op.juhe.cn/idcard/query" + "?key=" + key + "&idcard=" + idCard + "&realname=" + realName;logger.info("請求url:" + url);boolean match = false; //是否匹配try {String result = HttpClientUtil.doGet(url);System.out.println("請求結(jié)果：" + result);IdentityCheckResult identityCheckResult = JsonUtils.parse(result, IdentityCheckResult.class);IdentityCheck identityCheck = JsonUtils.parse(result, "result", IdentityCheck.class);logger.info(identityCheckResult);logger.info(identityCheck.toString());if(identityCheckResult.correct() && identityCheck.getRes() == 1){match = true;}} catch (Exception e) {e.printStackTrace();}logger.info("<-----------------調(diào)用聚合數(shù)據(jù) 身份證驗(yàn)證API END---------------");return match;}

【3】請求這個(gè)第三方接口：

使用HttpClientUtil工具類中的doGet方法來請求URL，得到結(jié)果，現(xiàn)在大多數(shù)是一個(gè)json字符串，類型為String

【4】根據(jù)接口返回?cái)?shù)據(jù)格式來解析數(shù)據(jù)：

可以看到，返回參數(shù)有六個(gè)，所以在項(xiàng)目中新建一個(gè)bean，包含以上六個(gè)字段，用來接住返回?cái)?shù)據(jù)，如下：

因?yàn)榻涌诜祷氐臄?shù)據(jù)是一個(gè)json的字符串，類型實(shí)際上是一個(gè)String字符串，要解析數(shù)據(jù)，用工具類JsonUtils的parse方法將字符串轉(zhuǎn)換為Java對象，JsonUtils的代碼如下：

package com.eqianxian.commons.utils.json; import java.util.List;import java.util.Map; import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONObject;import com.alibaba.fastjson.serializer.PropertyFilter;import com.alibaba.fastjson.serializer.SerializerFeature; /** * 在系統(tǒng)中統(tǒng)一使用這個(gè)，以方便將來切換不同的JSON生成工具 *  * @author KelvinZ *  */public class JsonUtils {public static final int TYPE_FASTJSON = 0;public static final int TYPE_GSON = 1; /** * <pre> * 對象轉(zhuǎn)化為json字符串 *  * @param obj 待轉(zhuǎn)化對象 * @return 代表該對象的Json字符串 */public static final String toJson(final Object obj) {return JSON.toJSONString(obj);// return gson.toJson(obj);} /** * <pre> * 對象轉(zhuǎn)化為json字符串 *  * @param obj 待轉(zhuǎn)化對象 * @return 代表該對象的Json字符串 */public static final String toJson(final Object obj, SerializerFeature... features) {return JSON.toJSONString(obj, features);// return gson.toJson(obj);} /** * 對象轉(zhuǎn)化為json字符串并格式化 *  * @param obj * @param format 是否要格式化 * @return */public static final String toJson(final Object obj, final boolean format) {return JSON.toJSONString(obj, format);} /** * 對象對指定字段進(jìn)行過濾處理，生成json字符串 *  * @param obj * @param fields 過濾處理字段 * @param ignore true做忽略處理，false做包含處理 * @param features json特征，為null忽略 * @return */public static final String toJson(final Object obj, final String[] fields, final boolean ignore,SerializerFeature... features) {if (fields == null || fields.length < 1) {return toJson(obj);}if (features == null)features = new SerializerFeature[] { SerializerFeature.QuoteFieldNames };return JSON.toJSONString(obj, new PropertyFilter() {@Overridepublic boolean apply(Object object, String name, Object value) {for (int i = 0; i < fields.length; i++) {if (name.equals(fields[i])) {return !ignore;}}return ignore;}}, features);} /** * <pre> * 解析json字符串中某路徑的值 *  * @param json * @param path * @return */@SuppressWarnings("unchecked")public static final <E> E parse(final String json, final String path) {String[] keys = path.split(",");JSONObject obj = JSON.parseObject(json);for (int i = 0; i < keys.length - 1; i++) {obj = obj.getJSONObject(keys[i]);}return (E) obj.get(keys[keys.length - 1]);} /** * <pre> * json字符串解析為對象 *  * @param json 代表一個(gè)對象的Json字符串 * @param clazz 指定目標(biāo)對象的類型，即返回對象的類型 * @return 從json字符串解析出來的對象 */public static final <T> T parse(final String json, final Class<T> clazz) {return JSON.parseObject(json, clazz);} /** * <pre> * json字符串解析為對象 *  * @param json json字符串 * @param path 逗號分隔的json層次結(jié)構(gòu) * @param clazz 目標(biāo)類 */public static final <T> T parse(final String json, final String path, final Class<T> clazz) {String[] keys = path.split(",");JSONObject obj = JSON.parseObject(json);for (int i = 0; i < keys.length - 1; i++) {obj = obj.getJSONObject(keys[i]);}String inner = obj.getString(keys[keys.length - 1]);return parse(inner, clazz);} /** * 將制定的對象經(jīng)過字段過濾處理后，解析成為json集合 *  * @param obj * @param fields * @param ignore * @param clazz * @param features * @return */public static final <T> List<T> parseArray(final Object obj, final String[] fields, boolean ignore,final Class<T> clazz, final SerializerFeature... features) {String json = toJson(obj, fields, ignore, features);return parseArray(json, clazz);} /** * <pre> * 從json字符串中解析出一個(gè)對象的集合，被解析字符串要求是合法的集合類型 * （形如:["k1":"v1","k2":"v2",..."kn":"vn"]） *  * @param json - [key-value-pair...] * @param clazz * @return */public static final <T> List<T> parseArray(final String json, final Class<T> clazz) {return JSON.parseArray(json, clazz);} /** * <pre> * 從json字符串中按照路徑尋找，并解析出一個(gè)對象的集合，例如： * 類Person有一個(gè)屬性name，要從以下json中解析出其集合： * { * "page_info":{ * "items":{ * "item":[{"name":"KelvinZ"},{"name":"Jobs"},...{"name":"Gates"}] * } * } * 使用方法：parseArray(json, "page_info,items,item", Person.class)， * 將根據(jù)指定路徑，正確的解析出所需集合，排除外層干擾 *  * @param json json字符串 * @param path 逗號分隔的json層次結(jié)構(gòu) * @param clazz 目標(biāo)類 * @return */public static final <T> List<T> parseArray(final String json, final String path, final Class<T> clazz) {String[] keys = path.split(",");JSONObject obj = JSON.parseObject(json);for (int i = 0; i < keys.length - 1; i++) {obj = obj.getJSONObject(keys[i]);}String inner = obj.getString(keys[keys.length - 1]);List<T> ret = parseArray(inner, clazz);return ret;} /** * <pre> * 有些json的常見格式錯誤這里可以處理，以便給后續(xù)的方法處理 * 常見錯誤：使用了\" 或者 "{ 或者 }"，騰訊的頁面中常見這種格式 *  * @param invalidJson 包含非法格式的json字符串 * @return */public static final String correctJson(final String invalidJson) {String content = invalidJson.replace("\\\"", "\"").replace("\"{", "{").replace("}\"", "}");return content;} /** * 格式化Json *  * @param json * @return */public static final String formatJson(String json) {Map<?, ?> map = (Map<?, ?>) JSON.parse(json);return JSON.toJSONString(map, true);} /** * 獲取json串中的子json *  * @param json * @param path * @return */public static final String getSubJson(String json, String path) {String[] keys = path.split(",");JSONObject obj = JSON.parseObject(json);for (int i = 0; i < keys.length - 1; i++) {obj = obj.getJSONObject(keys[i]);System.out.println(obj.toJSONString());}return obj != null ? obj.getString(keys[keys.length - 1]) : null;} }

以上就是Java中怎么調(diào)用第三方接口示范，小編相信有部分知識點(diǎn)可能是我們?nèi)粘９ぷ鲿姷交蛴玫降?。希望你能通過這篇文章學(xué)到更多知識。更多詳情敬請關(guān)注億速云行業(yè)資訊頻道。