//包再百度云盘 httpcomponents-client-4.5.5
package com.baidu.httpuntil;
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; ?
?
/**
* 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+")");
????????????????System.out.println("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; ?
???} ?
?????
} ?
HttpUtil
原文地址：https://www.cnblogs.com/sss-justdDoIt/p/9196542.html