HttpClient4.5 简单入门实例(一)

阅读更多

一、所需要的jar包

   httpclient-4.5.jar

   httpcore-4.4.1.jar

   httpmime-4.5.jar

二、实例

package cn.tzz.apache.httpclient;


import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
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.conn.ssl.DefaultHostnameVerifier;
import org.apache.http.conn.util.PublicSuffixMatcher;
import org.apache.http.conn.util.PublicSuffixMatcherLoader;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
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;


public class HttpClientUtil {
	private RequestConfig requestConfig = RequestConfig.custom()
            .setSocketTimeout(15000)
            .setConnectTimeout(15000)
            .setConnectionRequestTimeout(15000)
            .build();
	
	private static HttpClientUtil instance = null;
	private HttpClientUtil(){}
	public static HttpClientUtil getInstance(){
		if (instance == null) {
			instance = new HttpClientUtil();
		}
		return instance;
	}
	
	/**
	 * 发送 post请求
	 * @param httpUrl 地址
	 */
	public String sendHttpPost(String httpUrl) {
		HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost  
		return sendHttpPost(httpPost);
	}
	
	/**
	 * 发送 post请求
	 * @param httpUrl 地址
	 * @param params 参数(格式:key1=value1&key2=value2)
	 */
	public String sendHttpPost(String httpUrl, String params) {
		HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost  
		try {
			//设置参数
			StringEntity stringEntity = new StringEntity(params, "UTF-8");
			stringEntity.setContentType("application/x-www-form-urlencoded");
			httpPost.setEntity(stringEntity);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return sendHttpPost(httpPost);
	}
	
	/**
	 * 发送 post请求
	 * @param httpUrl 地址
	 * @param maps 参数
	 */
	public String sendHttpPost(String httpUrl, Map maps) {
		HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost  
		// 创建参数队列  
		List nameValuePairs = new ArrayList();
		for (String key : maps.keySet()) {
			nameValuePairs.add(new BasicNameValuePair(key, maps.get(key)));
		}
		try {
			httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
		} catch (Exception e) {
			e.printStackTrace();
		}
		return sendHttpPost(httpPost);
	}
	
	
	/**
	 * 发送 post请求（带文件）
	 * @param httpUrl 地址
	 * @param maps 参数
	 * @param fileLists 附件
	 */
	public String sendHttpPost(String httpUrl, Map maps, List fileLists) {
		HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost  
		MultipartEntityBuilder meBuilder = MultipartEntityBuilder.create();
		for (String key : maps.keySet()) {
			meBuilder.addPart(key, new StringBody(maps.get(key), ContentType.TEXT_PLAIN));
		}
		for(File file : fileLists) {
			FileBody fileBody = new FileBody(file);
			meBuilder.addPart("files", fileBody);
		}
		HttpEntity reqEntity = meBuilder.build();
		httpPost.setEntity(reqEntity);
		return sendHttpPost(httpPost);
	}
	
	/**
	 * 发送Post请求
	 * @param httpPost
	 * @return
	 */
	private String sendHttpPost(HttpPost httpPost) {
		CloseableHttpClient httpClient = null;
		CloseableHttpResponse response = null;
		HttpEntity entity = null;
		String responseContent = null;
		try {
			// 创建默认的httpClient实例.
			httpClient = HttpClients.createDefault();
			httpPost.setConfig(requestConfig);
			// 执行请求
			response = httpClient.execute(httpPost);
			entity = response.getEntity();
			responseContent = EntityUtils.toString(entity, "UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				// 关闭连接,释放资源
				if (response != null) {
					response.close();
				}
				if (httpClient != null) {
					httpClient.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return responseContent;
	}

	/**
	 * 发送 get请求
	 * @param httpUrl
	 */
	public String sendHttpGet(String httpUrl) {
		HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求
		return sendHttpGet(httpGet);
	}
	
	/**
	 * 发送 get请求Https
	 * @param httpUrl
	 */
	public String sendHttpsGet(String httpUrl) {
		HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求
		return sendHttpsGet(httpGet);
	}
	
	/**
	 * 发送Get请求
	 * @param httpPost
	 * @return
	 */
	private String sendHttpGet(HttpGet httpGet) {
		CloseableHttpClient httpClient = null;
		CloseableHttpResponse response = null;
		HttpEntity entity = null;
		String responseContent = null;
		try {
			// 创建默认的httpClient实例.
			httpClient = HttpClients.createDefault();
			httpGet.setConfig(requestConfig);
			// 执行请求
			response = httpClient.execute(httpGet);
			entity = response.getEntity();
			responseContent = EntityUtils.toString(entity, "UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				// 关闭连接,释放资源
				if (response != null) {
					response.close();
				}
				if (httpClient != null) {
					httpClient.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return responseContent;
	}
	
	/**
	 * 发送Get请求Https
	 * @param httpPost
	 * @return
	 */
	private String sendHttpsGet(HttpGet httpGet) {
		CloseableHttpClient httpClient = null;
		CloseableHttpResponse response = null;
		HttpEntity entity = null;
		String responseContent = null;
		try {
			// 创建默认的httpClient实例.
			PublicSuffixMatcher publicSuffixMatcher = PublicSuffixMatcherLoader.load(new URL(httpGet.getURI().toString()));
			DefaultHostnameVerifier hostnameVerifier = new DefaultHostnameVerifier(publicSuffixMatcher);
			httpClient = HttpClients.custom().setSSLHostnameVerifier(hostnameVerifier).build();
			httpGet.setConfig(requestConfig);
			// 执行请求
			response = httpClient.execute(httpGet);
			entity = response.getEntity();
			responseContent = EntityUtils.toString(entity, "UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				// 关闭连接,释放资源
				if (response != null) {
					response.close();
				}
				if (httpClient != null) {
					httpClient.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return responseContent;
	}
}

 三、测试代码

package cn.tzz.apache.httpclient;

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

import org.junit.Test;

public class HttpClientUtilTest {
	
	@Test
	public void testSendHttpPost1() {
		String responseContent = HttpClientUtil.getInstance()
				.sendHttpPost("http://localhost:8089/test/send?username=test01&password=123456");
		System.out.println("reponse content:" + responseContent);
	}
	
	@Test
	public void testSendHttpPost2() {
		String responseContent = HttpClientUtil.getInstance()
				.sendHttpPost("http://localhost:8089/test/send", "username=test01&password=123456");
		System.out.println("reponse content:" + responseContent);
	}
	
	@Test
	public void testSendHttpPost3() {
		Map maps = new HashMap();
		maps.put("username", "test01");
		maps.put("password", "123456");
		String responseContent = HttpClientUtil.getInstance()
				.sendHttpPost("http://localhost:8089/test/send", maps);
		System.out.println("reponse content:" + responseContent);
	}
	@Test
	public void testSendHttpPost4() {
		Map maps = new HashMap();
		maps.put("username", "test01");
		maps.put("password", "123456");
		List fileLists = new ArrayList();
		fileLists.add(new File("D://test//httpclient//1.png"));
		fileLists.add(new File("D://test//httpclient//1.txt"));
		String responseContent = HttpClientUtil.getInstance()
				.sendHttpPost("http://localhost:8089/test/sendpost/file", maps, fileLists);
		System.out.println("reponse content:" + responseContent);
	}

	@Test
	public void testSendHttpGet() {
		String responseContent = HttpClientUtil.getInstance()
				.sendHttpGet("http://localhost:8089/test/send?username=test01&password=123456");
		System.out.println("reponse content:" + responseContent);
	}
	
	@Test
	public void testSendHttpsGet() {
		String responseContent = HttpClientUtil.getInstance()
				.sendHttpsGet("https://www.baidu.com");
		System.out.println("reponse content:" + responseContent);
	}

}

 

@RequestMapping(value = "/test/send")
	@ResponseBody
	public Map sendPost(HttpServletRequest request) {
		Map maps = new HashMap();
		String username = request.getParameter("username");
		String password = request.getParameter("password");
		maps.put("username", username);
		maps.put("password", password);
		return maps;
	}
	
	@RequestMapping(value = "/test/sendpost/file",method=RequestMethod.POST)
	@ResponseBody
	public Map sendPostFile(@RequestParam("files") MultipartFile [] files,HttpServletRequest request) {
		Map maps = new HashMap();
		String username = request.getParameter("username");
		String password = request.getParameter("password");
		maps.put("username", username);
		maps.put("password", password);
		
		try {
			for(MultipartFile file : files){
				String fileName = file.getOriginalFilename();
				fileName = new String(fileName.getBytes(),"UTF-8");
				InputStream is = file.getInputStream();
				if (fileName != null && !("".equals(fileName))) {
					File directory = new File("D://test//httpclient//file");
					if (!directory.exists()) {
						directory.mkdirs();
					}
					String filePath = ("D://test//httpclient//file") + File.separator + fileName;
					FileOutputStream fos = new FileOutputStream(filePath);
					byte[] buffer = new byte[1024];
					while (is.read(buffer) > 0) {
						fos.write(buffer, 0, buffer.length);
					}
					fos.flush();
					fos.close();
					maps.put("file--"+fileName, "uploadSuccess");
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return maps;
	}