Java发送HTTP的get，post请求(JSON)

package com.jj.util;
import java.io.IOException;
import java.text.ParseException;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
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.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

import net.sf.json.JSONObject;

public class HttpUtil {
	/**
	 * 发送post请求
	 * 
	 * @param url
	 *            路径
	 * @param jsonObject
	 *            参数(json类型)
	 * @param encoding
	 *            编码格式
	 * @return
	 * @throws ParseException
	 * @throws IOException
	 */
	public static String doPost(String url, String jsonObject, String  encoding) throws ParseException, IOException {
		String body = "";
		// 创建httpclient对象
		CloseableHttpClient client = HttpClients.createDefault();
		// 创建post方式请求对象
		HttpPost httpPost = new HttpPost(url);
		// 装填参数
		StringEntity s = new StringEntity(jsonObject.toString(), "utf-8");
		s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
		// 设置参数到请求对象中
		httpPost.setEntity(s);
		System.out.println("请求地址：" + url);
		// System.out.println("请求参数："+nvps.toString());
		// 设置header信息
		// 指定报文头【Content-type】、【User-Agent】
		// httpPost.setHeader("Content-type",
		// "application/x-www-form-urlencoded");
		
		httpPost.setHeader("Content-type", "application/json");
		httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
		// 执行请求操作，并拿到结果（同步阻塞）
		CloseableHttpResponse response = client.execute(httpPost);
		// 获取结果实体
		HttpEntity entity = response.getEntity();
		if (entity != null) {
			// 按指定编码转换结果实体为String类型
			body = EntityUtils.toString(entity, encoding);
		}
		EntityUtils.consume(entity);
		// 释放链接
		response.close();
		return body;
	}
	
	/**
	 * 发送Get请求
     * json 字符串
     * @param url
     * @param jsonObject
     * @return
     */
    public static String doGet(String url,String param){
	      /* 1 生成 HttpClinet 对象并设置参数 */
	        HttpClient httpClient = new HttpClient();
	        // 设置 Http 连接超时为5秒
	        httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(5000);
	      /* 2 生成 GetMethod 对象并设置参数 */
	        GetMethod getMethod = new GetMethod(url);
	        // 设置 get 请求超时为 5 秒
	        getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000);
	        // 设置请求重试处理，用的是默认的重试处理：请求三次
	        getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
	        String response = "";
	      /* 3 执行 HTTP GET 请求 */
	        try {
	            int statusCode = httpClient.executeMethod(getMethod);
	         /* 4 判断访问的状态码 */
	            if (statusCode != HttpStatus.SC_OK) {
	                System.err.println("请求出错: "+ getMethod.getStatusLine());
	            }
	         /* 5 处理 HTTP 响应内容 */
	            // HTTP响应头部信息，这里简单打印
	            Header[] headers = getMethod.getResponseHeaders();
	            for (Header h : headers)
	                System.out.println(h.getName() + "------------ " + h.getValue());
	            // 读取 HTTP 响应内容，这里简单打印网页内容
	            byte[] responseBody = getMethod.getResponseBody();// 读取为字节数组
	
	            response = new String(responseBody, param);
	            System.out.println("----------response:" + response);
	            // 读取为 InputStream，在网页内容数据量大时候推荐使用
	            // InputStream response = getMethod.getResponseBodyAsStream();
	        } catch (HttpException e) {
	            // 发生致命的异常，可能是协议不对或者返回的内容有问题
	            System.out.println("请检查输入的URL!");
	            e.printStackTrace();
	        } catch (IOException e) {
	            // 发生网络异常
	            System.out.println("发生网络异常!");
	            e.printStackTrace();
	        } finally {
	         /* 6 .释放连接 */
	            getMethod.releaseConnection();
	        }
	        return response;
	    }	
}