【HttpClient详解】HttpClient的几种基本用法实例

骑猪看日落 2024-03-31 16:15 85阅读 0赞

package cn.zifangsky.httpclient;

import java.io.File;  
import java.util.ArrayList;  
import java.util.List;

import org.apache.http.Header;  
import org.apache.http.HttpEntity;  
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.entity.ContentType;  
import org.apache.http.entity.mime.MultipartEntityBuilder;  
import org.apache.http.entity.mime.content.StringBody;  
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 org.junit.Test;

/\*\*  
\* 几个基本用法实例  
\* @author zifangsky  
\*  
\*/  
public class Demo \{  
  
/\*\*  
\* 测试GET请求  
\*/  
@Test  
public void get()\{  
CloseableHttpClient httpClient = HttpClients.createDefault();  
try \{  
//创建HttpGet  
HttpGet httpGet = new HttpGet("http://webmagic.io");  
System.out.println("executing request: " + httpGet.getURI());  
  
//执行get请求  
CloseableHttpResponse response = httpClient.execute(httpGet);  
  
HttpEntity entity = response.getEntity();  
System.out.println("-------------------------");  
//打印响应状态  
System.out.println("Status: " + response.getStatusLine());  
//打印Server  
Header\[\] headers = response.getHeaders("Server");  
if(headers != null && headers.length > 0)\{  
System.out.println("Server: " + response.getHeaders("Server")\[0\].getValue());  
\}  
  
if(entity != null)\{  
//打印响应内容长度  
System.out.println("Response content length: " + entity.getContentLength());  
  
//打印响应内容  
System.out.println("Response content: " + EntityUtils.toString(entity));  
\}  
  
response.close();  
httpClient.close();  
\} catch (Exception e) \{  
e.printStackTrace();  
\}  
  
\}  
  
/\*\*  
\* 测试POST请求  
\*/  
@Test  
public void post()\{  
CloseableHttpClient httpClient = HttpClients.createDefault();  
try \{  
//创建HttpPost  
HttpPost httpPost = new HttpPost("http://xss.ooai.org/index.php?do=login&act=submit");  
//创建参数列表  
List<NameValuePair> formParams = new ArrayList<>();  
formParams.add(new BasicNameValuePair("user", "root123"));  
formParams.add(new BasicNameValuePair("pwd", "1qaz2wsxcde3"));  
  
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(formParams,"UTF-8");  
httpPost.setEntity(formEntity);  
System.out.println("executing request: " + httpPost.getURI());  
  
//执行post请求  
CloseableHttpResponse response = httpClient.execute(httpPost);  
  
HttpEntity entity = response.getEntity();  
System.out.println("-------------------------");  
//打印响应状态  
System.out.println("Status: " + response.getStatusLine());  
//打印Server  
Header\[\] headers = response.getHeaders("Server");  
if(headers != null && headers.length > 0)\{  
System.out.println("Server: " + response.getFirstHeader("Server").getValue());  
\}  
  
if(entity != null)\{  
//打印响应内容长度  
System.out.println("Response content length: " + entity.getContentLength());  
  
//打印响应内容  
System.out.println("Response content: " + EntityUtils.toString(entity));  
\}  
  
response.close();  
httpClient.close();  
\} catch (Exception e) \{  
e.printStackTrace();  
\}  
\}

/\*\*  
\* 测试文件上传  
\*/  
@Test  
public void upload()\{  
CloseableHttpClient httpClient = HttpClients.createDefault();  
try \{  
//创建HttpPost  
HttpPost httpPost = new HttpPost("http://localhost:7080/Fileupload/upload.html");  
//创建参数列表  
StringBody stringBody = new StringBody("12345678", ContentType.TEXT\_PLAIN);  
  
  
File picture = new File("C:/Users/Administrator/Desktop/1111.png");  
HttpEntity reqEntity = MultipartEntityBuilder.create().addBinaryBody("file", picture).addPart("userName",stringBody).build();  
  
httpPost.setEntity(reqEntity);  
System.out.println("executing request: " + httpPost.getURI());  
  
//执行post请求  
CloseableHttpResponse response = httpClient.execute(httpPost);  
  
HttpEntity entity = response.getEntity();  
System.out.println("-------------------------");  
//打印响应状态  
System.out.println("Status: " + response.getStatusLine());  
//打印Server  
Header\[\] headers = response.getHeaders("Server");  
if(headers != null && headers.length > 0)\{  
System.out.println("Server: " + response.getHeaders("Server")\[0\].getValue());  
\}  
  
if(entity != null)\{  
//打印响应内容长度  
System.out.println("Response content length: " + entity.getContentLength());  
  
//打印响应内容  
System.out.println("Response content: " + EntityUtils.toString(entity));  
\}  
  
response.close();  
httpClient.close();  
\} catch (Exception e) \{  
e.printStackTrace();  
\}  
\}