Comment envoyer http Get Post Request en Java en 5 minutes
Le blog d'aujourd'hui écrit en travaillant des heures supplémentaires, n'oubliez pas de l'aimer après l'avoir lu haha,
commencez par importer et envoyer la dépendance de requête http
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.8</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.3</version>
</dependency>
Ensuite, importez la dépendance get json d'Alibaba
<!-- 阿里巴巴获取json其中一段数据 发送http请求导入依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.9</version>
</dependency>
Après avoir importé les dépendances, importez la classe HttpClient. Il est recommandé d'appeler simplement ce nom et de modifier les noms dans d'autres classes.
package com.example.demo.test;
import com.alibaba.fastjson.JSONObject;
import com.example.demo.test.SSLClient;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
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.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
/**
* HttpClient发送GET、POST请求
* @Author libin
* @CreateDate 2018.5.28 16:56
*/
public class HttpClient {
private static final Logger LOGGER = LoggerFactory.getLogger(HttpClient.class);
/**
* 返回成功状态码
*/
private static final int SUCCESS_CODE = 200;
/**
* 发送GET请求
* @param url 请求url
* @param nameValuePairList 请求参数
* @return JSON或者字符串
* @throws Exception
*/
public static Object sendGet(String url, List<NameValuePair> nameValuePairList) throws Exception{
JSONObject jsonObject = null;
CloseableHttpClient client = null;
CloseableHttpResponse response = null;
try{
/**
* 创建HttpClient对象
*/
client = HttpClients.createDefault();
/**
* 创建URIBuilder
*/
URIBuilder uriBuilder = new URIBuilder(url);
/**
* 设置参数
*/
uriBuilder.addParameters(nameValuePairList);
/**
* 创建HttpGet
*/
HttpGet httpGet = new HttpGet(uriBuilder.build());
/**
* 设置请求头部编码
*/
httpGet.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
/**
* 设置返回编码
*/
httpGet.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));
/**
* 请求服务
*/
response = client.execute(httpGet);
/**
* 获取响应吗
*/
int statusCode = response.getStatusLine().getStatusCode();
if (SUCCESS_CODE == statusCode){
/**
* 获取返回对象
*/
HttpEntity entity = response.getEntity();
/**
* 通过EntityUitls获取返回内容
*/
String result = EntityUtils.toString(entity,"UTF-8");
/**
* 转换成json,根据合法性返回json或者字符串
*/
try{
jsonObject = JSONObject.parseObject(result);
return jsonObject;
}catch (Exception e){
return result;
}
}else{
LOGGER.error("HttpClientService-line: {}, errorMsg{}", 97, "GET请求失败！");
}
}catch (Exception e){
LOGGER.error("HttpClientService-line: {}, Exception: {}", 100, e);
} finally {
response.close();
client.close();
}
return null;
}
/**
* 发送POST请求
* @param url
* @param nameValuePairList
* @return JSON或者字符串
* @throws Exception
*/
public static <JSONObject> Object sendPost(String url, List<NameValuePair> nameValuePairList) throws Exception{
JSONObject jsonObject = null;
CloseableHttpClient client = null;
CloseableHttpResponse response = null;
try{
/**
* 创建一个httpclient对象
*/
client = HttpClients.createDefault();
/**
* 创建一个post对象
*/
HttpPost post = new HttpPost(url);
/**
* 包装成一个Entity对象
*/
StringEntity entity = new UrlEncodedFormEntity(nameValuePairList, "UTF-8");
/**
* 设置请求的内容
*/
post.setEntity(entity);
/**
* 设置请求的报文头部的编码
*/
post.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
/**
* 设置请求的报文头部的编码
*/
post.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));
/**
* 执行post请求
*/
response = client.execute(post);
/**
* 获取响应码
*/
int statusCode = response.getStatusLine().getStatusCode();
if (SUCCESS_CODE == statusCode){
/**
* 通过EntityUitls获取返回内容
*/
String result = EntityUtils.toString(response.getEntity(),"UTF-8");
/**
* 转换成json,根据合法性返回json或者字符串
*/
try{
jsonObject = (JSONObject) com.alibaba.fastjson.JSONObject.parseObject(result);
return jsonObject;
}catch (Exception e){
return result;
}
}else{
LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 146, "POST请求失败！");
}
}catch (Exception e){
LOGGER.error("HttpClientService-line: {}, Exception：{}", 149, e);
}finally {
response.close();
client.close();
}
return null;
}
/**
* 组织请求参数{参数名和参数值下标保持一致}
* @param params 参数名数组
* @param values 参数值数组
* @return 参数对象
*/
public static List<NameValuePair> getParams(Object[] params, Object[] values){
/**
* 校验参数合法性
*/
boolean flag = params.length>0 && values.length>0 && params.length == values.length;
if (flag){
List<NameValuePair> nameValuePairList = new ArrayList<>();
for(int i =0; i<params.length; i++){
nameValuePairList.add(new BasicNameValuePair(params[i].toString(),values[i].toString()));
}
return nameValuePairList;
}else{
LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 197, "请求参数为空且参数长度不一致");
}
return null;
}
public static Object doPostData(String url, String json) throws Exception {
JSONObject jsonObject = null;
DefaultHttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
String result = "";
HttpResponse res = null;
try {
StringEntity s = new StringEntity(json.toString(), "UTF-8");
s.setContentType("application/json");
post.setHeader("Accept", "application/json");
post.setHeader("Content-type", "application/json; charset=utf-8");
post.setEntity(s);
res = client.execute(post);
if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
result = EntityUtils.toString(res.getEntity());
jsonObject = JSONObject.parseObject(result);
return jsonObject;
// return HttpStatus.SC_OK + "";
}
} catch (Exception e) {
if(res == null) {
return "HttpResponse 为 null!";
}
throw new RuntimeException(e);
}
if(res == null || res.getStatusLine() == null) {
return "无响应";
}
return res.getStatusLine().getStatusCode() + "";
}
public static String doPost(String url, String map, String charset) {
org.apache.http.client.HttpClient httpClient = null;
HttpPost httpPost = null;
String result = null;
try {
httpClient = new SSLClient();
httpPost = new HttpPost(url);
//设置参数
httpPost.addHeader("Accept", "application/json");
httpPost.addHeader("Content-Type", "application/json;charset=UTF-8");
StringEntity stringEntity = new StringEntity(map);
stringEntity.setContentEncoding("UTF-8");
stringEntity.setContentType("application/json");
httpPost.setEntity(stringEntity);
HttpResponse response = httpClient.execute(httpPost);
if (response != null) {
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
result = EntityUtils.toString(resEntity, charset);
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
return result;
}
}
Ensuite, nous créons la suggestion de classe SSLClient pour suivre mon nom
package com.example.demo.test;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
public class SSLClient extends DefaultHttpClient {
public SSLClient() throws Exception {
super();
//传输协议需要根据自己的判断
SSLContext ctx = SSLContext.getInstance("TLS");
X509TrustManager tm = new X509TrustManager() {
@Override
public void checkClientTrusted(X509Certificate[] chain,
String authType) throws CertificateException {
}
@Override
public void checkServerTrusted(X509Certificate[] chain,
String authType) throws CertificateException {
}
@Override
public X509Certificate[] getAcceptedIssuers() {
return null;
}
};
ctx.init(null, new TrustManager[]{
tm}, null);
SSLSocketFactory ssf = new SSLSocketFactory(ctx, SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
ClientConnectionManager ccm = this.getConnectionManager();
SchemeRegistry sr = ccm.getSchemeRegistry();
sr.register(new Scheme("https", 443, ssf));
}
}
OK, enfin, importez une classe Test. Classe de test Demande d'envoi de test
package com.example.demo.test;
import org.apache.http.NameValuePair;
import java.util.List;
/**
* 发送post/get 测试类
*/
public class Test {
public static void main(String[] args) throws Exception{
/**
* 参数值
*/
Object [] params = new Object[]{
"param1","param2"};
/**
* 参数名
*/
Object [] values = new Object[]{
"value1","value2"};
/**
* 获取参数对象
*/
List<NameValuePair> paramsList = HttpClient.getParams(params, values);
/**
* 发送get
*/
Object result = HttpClient.sendGet(WXconstant.WXACCESSTOKEN, paramsList);
/**
* 发送post
*/
Object result2 = HttpClient.sendPost(WXconstant.WXACCESSTOKEN, paramsList);
System.out.println("GET返回信息：" + result);
System.out.println("POST返回信息：" + result2);
}
}
Écrivez simplement l'adresse URL que vous souhaitez demander sans modifier la valeur du paramètre.
D'accord, c'est tout. Si vous voulez savoir comment envoyer une requête http avec des paramètres json, accédez au prochain article de blog et n'oubliez pas d'aimer + suivre.