1 Maven引用
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.3</version>
</dependency>
2 参考地址
http://hc.apache.org/
3 HttpUtil
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
/**
* @author Administrator
* @version 1.0.0
* @description Http传输工具
* @datetime 2017/4/15 18:09
*/
public class HttpUtil {
/**
* This example
* the process of processing the HTTP response and releasing associated resources.
*/
public static void httpGet() throws IOException {
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
HttpGet httpget = new HttpGet("http://httpbin.org/");
System.out.println("Executing request " + httpget.getRequestLine());
// Create a custom response handler
ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
@Override
public String handleResponse(
final HttpResponse response) throws ClientProtocolException, IOException {
int status = response.getStatusLine().getStatusCode();
if (status >= 200 && status < 300) {
HttpEntity entity = response.getEntity();
return entity != null ? EntityUtils.toString(entity) : null;
} else {
throw new ClientProtocolException("Unexpected response status: " + status);
}
}
};
String responseBody = httpclient.execute(httpget, responseHandler);
System.out.println("----------------------------------------");
System.out.println(responseBody);
} finally {
httpclient.close();
}
}
/**
* post json格式的字符串
* @throws IOException
*/
public static void httpPost() throws IOException {
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
HttpPost httppost = new HttpPost("http://httpbin.org/");
//Interface HttpEntity
//AbstractHttpEntity, BasicHttpEntity, BufferedHttpEntity, ByteArrayEntity, EntityTemplate, FileEntity, HttpEntityWrapper, InputStreamEntity, SerializableEntity, StringEntity
httppost.setEntity(new StringEntity("{a:123}", ContentType.APPLICATION_JSON));
System.out.println("Executing request " + httppost.getRequestLine());
//All Known ResponseHandler Implementing Classes:
//AbstractResponseHandler, BasicResponseHandler
String responseBody = httpclient.execute(httppost, new BasicResponseHandler());
System.out.println("----------------------------------------");
System.out.println(responseBody);
} finally {
httpclient.close();
}
}
}
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HttpUtil(1).java