JAVA POST请求远程HTTP接口

package com.oemp.common;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * @author Post Method
 */
public class HttpPostUrl {

	/**
	 * 向指定URL发送POST请求
	 * @param url
	 * @param paramMap
	 * @return 响应结果
	 */
	public static String sendPost(String url, Map paramMap) {
		PrintWriter out = null;
		BufferedReader in = null;
		String result = "";
		try {
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			URLConnection conn = realUrl.openConnection();
			// 设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// conn.setRequestProperty("Charset", "UTF-8");
			// 发送POST请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			// 获取URLConnection对象对应的输出流
			out = new PrintWriter(conn.getOutputStream());

			// 设置请求属性
			String param = "";
			if (paramMap != null && paramMap.size() > 0) {
				Iterator ite = paramMap.keySet().iterator();
				while (ite.hasNext()) {
					String key = ite.next();// key
					String value = paramMap.get(key);
					param += key + "=" + value + "&";
				}
				param = param.substring(0, param.length() - 1);
			}

			// 发送请求参数
			out.print(param);
			// flush输出流的缓冲
			out.flush();
			// 定义BufferedReader输入流来读取URL的响应
			in = new BufferedReader(
					new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			System.err.println("发送 POST 请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输出流、输入流
		finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
	}
	
    /**
     * 数据流post请求
     * @param urlStr
     * @param xmlInfo
     */
	public static String doPost(String urlStr, String strInfo) {
		String reStr="";
		try {
			URL url = new URL(urlStr);
			URLConnection con = url.openConnection();
			con.setDoOutput(true);
			con.setRequestProperty("Pragma:", "no-cache");
			con.setRequestProperty("Cache-Control", "no-cache");
			con.setRequestProperty("Content-Type", "text/xml");
			OutputStreamWriter out = new OutputStreamWriter(con.getOutputStream());
			out.write(new String(strInfo.getBytes("utf-8")));
			out.flush();
			out.close();
			BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), "utf-8"));
			String line = "";
			for (line = br.readLine(); line != null; line = br.readLine()) {
				reStr += line;
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return reStr;
	}
	

	/**
	 * 测试主方法
	 * @param args
	 */
	public static void main(String[] args) {
		Map mapParam = new HashMap();
		mapParam.put("name", "张三");
		mapParam.put("validation","test");
		String pathUrl = "http://localhost/testPost.action";
		String result = sendPost(pathUrl, mapParam);
		System.out.println(result);

	}

}

package com.sporch.util;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class HttpUtil {

    private static String charset = "utf-8";
    private static HttpClient httpClient = HttpClients.createDefault();

    @SuppressWarnings({"unchecked", "rawtypes"})
    public static String doPost(String url, String jsonStr) {
        HttpPost httpPost;
        String result = null;
        try {
            httpPost = new HttpPost(url);
            // 设置参数
            httpPost.setHeader("content-Type","application/json;charset=UTF-8");
            StringEntity entity = new StringEntity(jsonStr);
            httpPost.setEntity(entity);
            HttpResponse response = httpClient.execute(httpPost);
            if (response != null) {
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    result = EntityUtils.toString(resEntity, charset);
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return result;
    }

}