用httpclient4.x 发送http get post请求。

最新推荐文章于 2021-02-13 04:58:55 发布

sunnylovecmc

最新推荐文章于 2021-02-13 04:58:55 发布

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分类专栏：博文心得

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本文深入探讨了使用Apache HttpClient库实现GET和POST请求的方法，包括URL编码、参数设置、异常处理以及返回数据的解析过程。

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package org.ibmp.gmp.util;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
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.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

public class HttpClientUtil {

	private static HttpClient httpClient = new DefaultHttpClient();

	/**
	 * 发送Get请求
	 * @param url
	 * @param params
	 * @return
	 */
	public static String get(String url, List<NameValuePair> params) {
		String body = null;
		try {
			// Get请求
			HttpGet httpget = new HttpGet(url);
			// 设置参数
			String str = EntityUtils.toString(new UrlEncodedFormEntity(params));
			httpget.setURI(new URI(httpget.getURI().toString() + "?" + str));
			// 发送请求
			HttpResponse httpresponse = httpClient.execute(httpget);
			// 获取返回数据
			HttpEntity entity = httpresponse.getEntity();
			body = EntityUtils.toString(entity);
			if (entity != null) {
				entity.consumeContent();
			}
		} catch (ParseException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (URISyntaxException e) {
			e.printStackTrace();
		}
		return body;
	}

	/**
	 * 发送 Post请求
	 * @param url
	 * @param reqXml
	 * @return
	 */
	public static String post(String url, String reqXml) {
		String body = null;
		try {
			//设置客户端编码
			if (httpClient == null) {
				// Create HttpClient Object
				httpClient = new DefaultHttpClient();
				}
			httpClient.getParams().setParameter("http.protocol.content-charset",HTTP.UTF_8);
			httpClient.getParams().setParameter(HTTP.CONTENT_ENCODING, HTTP.UTF_8);
			httpClient.getParams().setParameter(HTTP.CHARSET_PARAM, HTTP.UTF_8);
			httpClient.getParams().setParameter(HTTP.DEFAULT_PROTOCOL_CHARSET,HTTP.UTF_8);
			// Post请求
			HttpPost httppost = new HttpPost(url);
			//设置post编码
			httppost.getParams().setParameter("http.protocol.content-charset",HTTP.UTF_8);
			httppost.getParams().setParameter(HTTP.CONTENT_ENCODING, HTTP.UTF_8);
			httppost.getParams().setParameter(HTTP.CHARSET_PARAM, HTTP.UTF_8);
			httppost.getParams().setParameter(HTTP.DEFAULT_PROTOCOL_CHARSET, HTTP.UTF_8);
	
			// 设置参数
			 List<NameValuePair> params = new ArrayList<NameValuePair>();
			 params.add(new BasicNameValuePair("$xmldata", reqXml));
			 httppost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); 
//			StringEntity entity1 = new StringEntity(getUTF8XMLString(reqXml), "UTF-8");
//			entity1.setContentType("text/xml;charset=UTF-8");
//			entity1.setContentEncoding("UTF-8");
//			httppost.setEntity(entity1);
			//设置报文头
			httppost.setHeader("Content-Type", "text/xml;charset=UTF-8");
			// 发送请求
			HttpResponse httpresponse = httpClient.execute(httppost);
			// 获取返回数据
			HttpEntity entity = httpresponse.getEntity();
			body = EntityUtils.toString(entity);
			if (entity != null) {
				entity.consumeContent();
			}
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (ParseException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return body;
	}
	/**
	 * 根据样式格式化时间
	 * "yyyyMMdd"
	 * "yyyyMMddHHmmss"
	 * "yyyyMMddHHmmssssssss"
	 * @param dateFormat
	 * @return
	 */
	public static String getnowDate(String dateFormat)
 	{
 		SimpleDateFormat sdf = new SimpleDateFormat(dateFormat); 
 		return sdf.format(new Date());
 	}

}