HttpClient工具类-优快云博客

本文介绍了一个简单的Java HTTP客户端实现，包括GET和POST请求的方法。通过使用Apache HttpClient库，该客户端能够构建URL、发送请求并处理响应。文章提供了完整的代码示例，展示了如何设置请求配置、处理异常以及关闭资源。

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<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5</version>
</dependency>

 


package com;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
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.HttpGet;
import org.apache.http.client.methods.HttpPost;
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;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class M_HttpClient {
public static String get(String url, Map<String, String> param) {

//创建HttpClient对象
CloseableHttpClient httpClient = HttpClients.createDefault();


String resultString = "";
CloseableHttpResponse response = null;
try {
//创建uri
URIBuilder builder = new URIBuilder(url);
if (param != null) {
for (String key : param.keySet()) {
builder.addParameter(key, param.get(key));
}
}
URI uri = builder.build();

//创建Http Get请求

HttpGet httpGet=new HttpGet(uri);//HTTP Get请求(POST雷同)
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(1000).setConnectTimeout(1000).build();//设置请求和传输超时时间
httpGet.setConfig(requestConfig);
httpClient.execute(httpGet);//执行请求

//执行请求
response = httpClient.execute(httpGet);

//判断返回状态是否为200
if (response.getStatusLine().getStatusCode() == 200) {
resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
}

} catch (URISyntaxException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (response != null) {
response.close();
}
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return resultString;
}

public static String get(String url) {
return get(url, null);
}
public static String post(String url, Map<String, String> param) {
//创建HttpClient对象
CloseableHttpClient httpClient = HttpClients.createDefault();

String resultString = "";
CloseableHttpResponse response = null;

try {
//创建Http Post请求
HttpPost httpPost = new HttpPost(url);

//创建参数列表
if (param != null) {
List<NameValuePair> paramList = new ArrayList();
for (String key : param.keySet()) {
paramList.add(new BasicNameValuePair(key, param.get(key)));
}

//模拟表单
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList, "UTF-8");
httpPost.setEntity(entity);
}

//执行http请求
response = httpClient.execute(httpPost);
resultString = EntityUtils.toString(response.getEntity(), "UTF-8");

} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (response != null) {
response.close();
}
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}

return resultString;
}

public static String post(String url) {
return post(url, null);
}
}

转载于:https://www.cnblogs.com/minglie/p/9326803.html