发送HTTP请求 -- HttpUtil

package com.step.utils;

import java.io.IOException;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
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.util.EntityUtils;

import com.alibaba.fastjson.JSONObject;



/**
 * 发送HTTP请求
 * @author mlu
 *
 */
public class HttpUtils {
	
	/**
	 * 发送post请求--用于接口接收的参数为JSON字符串
	 * @param url 请求地址
	 * @param params json格式的字符串
	 * @return
	 */
	public static String httpPost(String url, String params){
		String result = null;
		try {
			HttpClient httpClient = new DefaultHttpClient();
			HttpPost httpPost = new HttpPost(url);
			/*
			 * 发送json字符串，这两句需要设置
			 */
			httpPost.addHeader("Content-type","application/json; charset=utf-8");  
			httpPost.setHeader("Accept", "application/json");  
            
			httpPost.setEntity(new StringEntity(params, "UTF-8"));
			
            HttpResponse response = httpClient.execute(httpPost);  
            
            int statusCode = response.getStatusLine().getStatusCode();  
              
            if (statusCode == HttpStatus.SC_OK) {  
                // Read the response body  
            	result = EntityUtils.toString(response.getEntity(),"UTF-8");  
            } 
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}
	
	/**
	 * 发送post请求--用于接口接收的参数为键值对
	 * @param url 请求地址
	 * @param nameValuePairs 键值对
	 * @return
	 */
	public static String httpPost(String url, List nameValuePairs) {
		HttpClient httpClient = new DefaultHttpClient();
		HttpPost httpPost = new HttpPost(url);
		String strResult = "";

		try {
			httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
			HttpResponse response = httpClient.execute(httpPost);

			if (response.getStatusLine().getStatusCode() == 200) {
				/* 读返回数据 */
				strResult = EntityUtils.toString(response.getEntity());
				// System.out.println("conResult:"+conResult);
			} else {
				strResult += "发送失败:" + response.getStatusLine().getStatusCode();
			}
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		return strResult;
	}
	
	public static String httpGet(String url, List nameValuePairs){
		HttpClient httpClient = new DefaultHttpClient();
		String sb = "";
		String result = "";
		try {
			for(NameValuePair nvp:nameValuePairs){
				sb += nvp.getName()+"="+nvp.getValue()+"&";
			}
			sb = sb.substring(0,sb.length()-1);
			sb = URLDecoder.decode(sb, "UTF-8");
			HttpGet httpGet = new HttpGet(url+"?"+sb);
		
			HttpResponse response = httpClient.execute(httpGet);
			if (response.getStatusLine().getStatusCode() == 200) {
				/* 读返回数据 */
				result = EntityUtils.toString(response.getEntity());
			} else {
				result += "发送失败:" + response.getStatusLine().getStatusCode();
			}
			
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return result;
	}
	
	public static void main(String[] args) {
		String url = "http://10.140.8.56/gd_fssc/rest/fsscService/getStaffInfo";
		String url2 = "http://localhost:8080/eshore-app-backframe-web/interface/getJson";

		// 发送 POST 请求
		JSONObject json = new JSONObject();
		json.put("number", "44053211@GD");
		httpPost(url,json.toString());
		
		List nameValuePairs = new ArrayList<>();
		nameValuePairs.add(new BasicNameValuePair("method", "login"));
		httpGet(url2,nameValuePairs);
	}
}

引用的jar包：