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<String, String> 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<String> 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<String, String> mapParam = new HashMap<String, String>();
        mapParam.put("name", "张三");
        mapParam.put("validation","test");
        String pathUrl = "http://localhost/testPost.action";
        String result = sendPost(pathUrl, mapParam);
        System.out.println(result);

    }

}