java使用httpclient封装post请求和get的请求

妖狐艹你老母 2022-06-07 13:54 283阅读 0赞

在我们程序员生涯中，经常要复用代码，所以我们应该养成时常整理代码的好习惯，以下是我之前封装的httpclient的post和get请求所用的代码：

package com.marco.common;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.net.URI;
    import java.util.ArrayList;
    import java.util.Iterator;
    import java.util.List;
    import java.util.Map;
    
    import org.apache.http.HttpEntity;
    import org.apache.http.HttpResponse;
    import org.apache.http.HttpStatus;
    import org.apache.http.NameValuePair;
    import org.apache.http.StatusLine;
    import org.apache.http.client.HttpClient;
    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.StringEntity;
    import org.apache.http.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.DefaultHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.message.BasicNameValuePair;
    import org.apache.http.protocol.HTTP;
    import org.apache.http.util.EntityUtils;
    import org.apache.log4j.Logger;
    
    /**
     * @author 马弦
     * @date 2017年10月23日 下午2:49
     * HttpClient工具类
     */
    public class HttpUtil {
    	
    	private static Logger logger = Logger.getLogger(HttpUtil.class);
    
    	/**
    	 * get请求
    	 * @return
    	 */
    	public static String doGet(String url) {
            try {
            	HttpClient client = new DefaultHttpClient();
                //发送get请求
                HttpGet request = new HttpGet(url);
                HttpResponse response = client.execute(request);
     
                /**请求发送成功，并得到响应**/
                if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                    /**读取服务器返回过来的json字符串数据**/
                    String strResult = EntityUtils.toString(response.getEntity());
                    
                    return strResult;
                }
            } 
            catch (IOException e) {
            	e.printStackTrace();
            }
            
            return null;
    	}
    	
    	/**
    	 * post请求(用于key-value格式的参数)
    	 * @param url
    	 * @param params
    	 * @return
    	 */
    	public static String doPost(String url, Map params){
    		
    		BufferedReader in = null;  
            try {  
                // 定义HttpClient  
                HttpClient client = new DefaultHttpClient();  
                // 实例化HTTP方法  
                HttpPost request = new HttpPost();  
                request.setURI(new URI(url));
                
                //设置参数
                List<NameValuePair> nvps = new ArrayList<NameValuePair>(); 
                for (Iterator iter = params.keySet().iterator(); iter.hasNext();) {
        			String name = (String) iter.next();
        			String value = String.valueOf(params.get(name));
        			nvps.add(new BasicNameValuePair(name, value));
        			
        			//System.out.println(name +"-"+value);
        		}
                request.setEntity(new UrlEncodedFormEntity(nvps,HTTP.UTF_8));
                
                HttpResponse response = client.execute(request);  
                int code = response.getStatusLine().getStatusCode();
                if(code == 200){	//请求成功
                	in = new BufferedReader(new InputStreamReader(response.getEntity()  
                            .getContent(),"utf-8"));
                    StringBuffer sb = new StringBuffer("");  
                    String line = "";  
                    String NL = System.getProperty("line.separator");  
                    while ((line = in.readLine()) != null) {  
                        sb.append(line + NL);  
                    }
                    
                    in.close();  
                    
                    return sb.toString();
                }
                else{	//
                	System.out.println("状态码：" + code);
                	return null;
                }
            }
            catch(Exception e){
            	e.printStackTrace();
            	
            	return null;
            }
    	}
    	
    	/**
    	 * post请求（用于请求json格式的参数）
    	 * @param url
    	 * @param params
    	 * @return
    	 */
    	public static String doPost(String url, String params) throws Exception {
    		
    		CloseableHttpClient httpclient = HttpClients.createDefault();
    		HttpPost httpPost = new HttpPost(url);// 创建httpPost   
        	httpPost.setHeader("Accept", "application/json"); 
        	httpPost.setHeader("Content-Type", "application/json");
        	String charSet = "UTF-8";
        	StringEntity entity = new StringEntity(params, charSet);
        	httpPost.setEntity(entity);        
            CloseableHttpResponse response = null;
            
            try {
            	
            	response = httpclient.execute(httpPost);
                StatusLine status = response.getStatusLine();
                int state = status.getStatusCode();
                if (state == HttpStatus.SC_OK) {
                	HttpEntity responseEntity = response.getEntity();
                	String jsonString = EntityUtils.toString(responseEntity);
                	return jsonString;
                }
                else{
    				 logger.error("请求返回:"+state+"("+url+")");
    			}
            }
            finally {
                if (response != null) {
                    try {
                        response.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                try {
    				httpclient.close();
    			} catch (IOException e) {
    				e.printStackTrace();
    			}
            }
            return null;
    	}
    	
    }

httpclient是一个非常常用的工具，在项目开发的时候，经常需要请求第三方的接口，我整理好了这段代码，以后回头找的时候就方便啦！