Http的Post/Get请求示例

悠悠 2022-04-15 05:27 744阅读 0赞

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<String, String> maps) {
    		HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost  
    		// 创建参数队列  
    		List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
    		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<String, String> maps, List<File> 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<String, String> maps = new HashMap<String, String>();
    		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<String, String> maps = new HashMap<String, String>();
    		maps.put("username", "test01");
    		maps.put("password", "123456");
    		List<File> fileLists = new ArrayList<File>();
    		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<String, String> sendPost(HttpServletRequest request) {
    		Map<String, String> maps = new HashMap<String, String>();
    		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<String, String> sendPostFile(@RequestParam("files") MultipartFile [] files,HttpServletRequest request) {
    		Map<String, String> maps = new HashMap<String, String>();
    		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;
    	}

原文链接：[http://tzz6.iteye.com/blog/2224757][http_tzz6.iteye.com_blog_2224757]

[http_tzz6.iteye.com_blog_2224757]: http://tzz6.iteye.com/blog/2224757