使用HttpClient調(diào)用接口的實(shí)例講解
更新時(shí)間：2017年10月07日 09:55:58 作者：0001
下面小編就為大家?guī)?lái)一篇使用HttpClient調(diào)用接口的實(shí)例講解。小編覺(jué)得挺不錯(cuò)的，現(xiàn)在就分享給大家，也給大家做個(gè)參考。一起跟隨小編過(guò)來(lái)看看吧
一，編寫(xiě)返回對(duì)象
public class HttpResult {
// 響應(yīng)的狀態(tài)碼
private int code;
// 響應(yīng)的響應(yīng)體
private String body;
get/set…
}
二，封裝HttpClient
package cn.xxxxxx.httpclient;
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.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.utils.URIBuilder;
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 APIService {
private CloseableHttpClient httpClient;
public APIService() {
// 1 創(chuàng)建HttpClinet，相當(dāng)于打開(kāi)瀏覽器
this.httpClient = HttpClients.createDefault();
}
/**
* 帶參數(shù)的get請(qǐng)求
*
* @param url
* @param map
* @return
* @throws Exception
*/
public HttpResult doGet(String url, Map<String, Object> map) throws Exception {
// 聲明URIBuilder
URIBuilder uriBuilder = new URIBuilder(url);
// 判斷參數(shù)map是否為非空
if (map != null) {
// 遍歷參數(shù)
for (Map.Entry<String, Object> entry : map.entrySet()) {
// 設(shè)置參數(shù)
uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
}
}
// 2 創(chuàng)建httpGet對(duì)象，相當(dāng)于設(shè)置url請(qǐng)求地址
HttpGet httpGet = new HttpGet(uriBuilder.build());
// 3 使用HttpClient執(zhí)行httpGet，相當(dāng)于按回車，發(fā)起請(qǐng)求
CloseableHttpResponse response = this.httpClient.execute(httpGet);
// 4 解析結(jié)果，封裝返回對(duì)象httpResult，相當(dāng)于顯示相應(yīng)的結(jié)果
// 狀態(tài)碼
// response.getStatusLine().getStatusCode();
// 響應(yīng)體，字符串，如果response.getEntity()為空，下面這個(gè)代碼會(huì)報(bào)錯(cuò),所以解析之前要做非空的判斷
// EntityUtils.toString(response.getEntity(), "UTF-8");
HttpResult httpResult = null;
// 解析數(shù)據(jù)封裝HttpResult
if (response.getEntity() != null) {
httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
EntityUtils.toString(response.getEntity(), "UTF-8"));
} else {
httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
}
// 返回
return httpResult;
}
/**
* 不帶參數(shù)的get請(qǐng)求
*
* @param url
* @return
* @throws Exception
*/
public HttpResult doGet(String url) throws Exception {
HttpResult httpResult = this.doGet(url, null);
return httpResult;
}
/**
* 帶參數(shù)的post請(qǐng)求
*
* @param url
* @param map
* @return
* @throws Exception
*/
public HttpResult doPost(String url, Map<String, Object> map) throws Exception {
// 聲明httpPost請(qǐng)求
HttpPost httpPost = new HttpPost(url);
// 判斷map不為空
if (map != null) {
// 聲明存放參數(shù)的List集合
List<NameValuePair> params = new ArrayList<NameValuePair>();
// 遍歷map，設(shè)置參數(shù)到list中
for (Map.Entry<String, Object> entry : map.entrySet()) {
params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
}
// 創(chuàng)建form表單對(duì)象
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8");
// 把表單對(duì)象設(shè)置到httpPost中
httpPost.setEntity(formEntity);
}
// 使用HttpClient發(fā)起請(qǐng)求，返回response
CloseableHttpResponse response = this.httpClient.execute(httpPost);
// 解析response封裝返回對(duì)象httpResult
HttpResult httpResult = null;
if (response.getEntity() != null) {
httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
EntityUtils.toString(response.getEntity(), "UTF-8"));
} else {
httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
}
// 返回結(jié)果
return httpResult;
}
/**
* 不帶參數(shù)的post請(qǐng)求
*
* @param url
* @return
* @throws Exception
*/
public HttpResult doPost(String url) throws Exception {
HttpResult httpResult = this.doPost(url, null);
return httpResult;
}
/**
* 帶參數(shù)的Put請(qǐng)求
*
* @param url
* @param map
* @return
* @throws Exception
*/
public HttpResult doPut(String url, Map<String, Object> map) throws Exception {
// 聲明httpPost請(qǐng)求
HttpPut httpPut = new HttpPut(url);
// 判斷map不為空
if (map != null) {
// 聲明存放參數(shù)的List集合
List<NameValuePair> params = new ArrayList<NameValuePair>();
// 遍歷map，設(shè)置參數(shù)到list中
for (Map.Entry<String, Object> entry : map.entrySet()) {
params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
}
// 創(chuàng)建form表單對(duì)象
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8");
// 把表單對(duì)象設(shè)置到httpPost中
httpPut.setEntity(formEntity);
}
// 使用HttpClient發(fā)起請(qǐng)求，返回response
CloseableHttpResponse response = this.httpClient.execute(httpPut);
// 解析response封裝返回對(duì)象httpResult
HttpResult httpResult = null;
if (response.getEntity() != null) {
httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
EntityUtils.toString(response.getEntity(), "UTF-8"));
} else {
httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
}
// 返回結(jié)果
return httpResult;
}
/**
* 帶參數(shù)的Delete請(qǐng)求
*
* @param url
* @param map
* @return
* @throws Exception
*/
public HttpResult doDelete(String url, Map<String, Object> map) throws Exception {
// 聲明URIBuilder
URIBuilder uriBuilder = new URIBuilder(url);
// 判斷參數(shù)map是否為非空
if (map != null) {
// 遍歷參數(shù)
for (Map.Entry<String, Object> entry : map.entrySet()) {
// 設(shè)置參數(shù)
uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
}
}
// 2 創(chuàng)建httpGet對(duì)象，相當(dāng)于設(shè)置url請(qǐng)求地址
HttpDelete httpDelete = new HttpDelete(uriBuilder.build());
// 3 使用HttpClient執(zhí)行httpGet，相當(dāng)于按回車，發(fā)起請(qǐng)求
CloseableHttpResponse response = this.httpClient.execute(httpDelete);
// 4 解析結(jié)果，封裝返回對(duì)象httpResult，相當(dāng)于顯示相應(yīng)的結(jié)果
// 狀態(tài)碼
// response.getStatusLine().getStatusCode();
// 響應(yīng)體，字符串，如果response.getEntity()為空，下面這個(gè)代碼會(huì)報(bào)錯(cuò),所以解析之前要做非空的判斷
// EntityUtils.toString(response.getEntity(), "UTF-8");
HttpResult httpResult = null;
// 解析數(shù)據(jù)封裝HttpResult
if (response.getEntity() != null) {
httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
EntityUtils.toString(response.getEntity(), "UTF-8"));
} else {
httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
}
// 返回
return httpResult;
}
}
三，調(diào)用接口
package cn.xxxxxx.httpclient.test;
import java.util.HashMap;
import java.util.Map;
import org.junit.Before;
import org.junit.Test;
import cn.itcast.httpclient.APIService;
import cn.itcast.httpclient.HttpResult;
public class APIServiceTest {
private APIService apiService;
@Before
public void init() {
this.apiService = new APIService();
}
// 查詢
@Test
public void testQueryItemById() throws Exception {
// http://manager.aaaaaa.com/rest/item/interface/{id}
String url = "http://manager.aaaaaa.com/rest/item/interface/42";
HttpResult httpResult = this.apiService.doGet(url);
System.out.println(httpResult.getCode());
System.out.println(httpResult.getBody());
}
// 新增
@Test
public void testSaveItem() throws Exception {
// http://manager.aaaaaa.com/rest/item/interface/{id}
String url = "http://manager.aaaaaa.com/rest/item/interface";
Map<String, Object> map = new HashMap<String, Object>();
// title=測(cè)試RESTful風(fēng)格的接口&price=1000&num=1&cid=888&status=1
map.put("title", "測(cè)試APIService調(diào)用新增接口");
map.put("price", "1000");
map.put("num", "1");
map.put("cid", "666");
map.put("status", "1");
HttpResult httpResult = this.apiService.doPost(url, map);
System.out.println(httpResult.getCode());
System.out.println(httpResult.getBody());
}
// 修改
@Test
public void testUpdateItem() throws Exception {
// http://manager.aaaaaa.com/rest/item/interface/{id}
String url = "http://manager.aaaaaa.com/rest/item/interface";
Map<String, Object> map = new HashMap<String, Object>();
// title=測(cè)試RESTful風(fēng)格的接口&price=1000&num=1&cid=888&status=1
map.put("title", "測(cè)試APIService調(diào)用修改接口");
map.put("id", "44");
HttpResult httpResult = this.apiService.doPut(url, map);
System.out.println(httpResult.getCode());
System.out.println(httpResult.getBody());
}
// 刪除
@Test
public void testDeleteItemById() throws Exception {
// http://manager.aaaaaa.com/rest/item/interface/{id}
String url = "http://manager.aaaaaa.com/rest/item/interface/44";
HttpResult httpResult = this.apiService.doDelete(url, null);
System.out.println(httpResult.getCode());
System.out.println(httpResult.getBody());
}
}
以上這篇使用HttpClient調(diào)用接口的實(shí)例講解就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。
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