java后台用GET POSTt方式提交参数类

package com.skyblue.core.database;

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

public class RequestHelper {
    
	/**
	 * 
	 *  @Description    : 向指定URL发送POST方法的请求
	 *  @Method_Name    : sendPost
	 *  @param linkUrl	地址URL
	 *  @param postData 提交数据 name1=value1&name2=value2的形式。
	 *  @param headparam 通用的请求属性  注意 Cookie 写setRequestProperty("Cookie", cookieValue);
	 *  @return 
	 *  @return         : String
	 *  @Creation Date  : 2012-4-7 下午02:38:59 
	 *  @version        : v1.00
	 *  @Author         : skyblue
	 *  @Update Date    : 
	 *  @Update Author  : skyblue
	 */
	@SuppressWarnings("unchecked")
	public static String sendPost(String linkUrl, String postData ,Map headparam){
		String result = "";
		URL url=null;
		HttpURLConnection httpUrl=null;
		BufferedReader reader=null;
		try {
			url = new URL(linkUrl);
			httpUrl = (HttpURLConnection) url.openConnection();
			// 设置请求方式，默认为POST
			httpUrl.setRequestMethod("POST");//POST||GET
			// Post 请求不能使用缓存
			httpUrl.setUseCaches(false);
			//设置通用的请求属性
			if(headparam!=null){
	  			Iterator it=headparam.entrySet().iterator();
	  			while(it.hasNext()){
	  				Map.Entry entry = (Map.Entry) it.next();
	  				//写头 
	  				httpUrl.setRequestProperty((String)entry.getKey(),(String)headparam.get(entry.getKey()));
	  			}
			}
			
	        //提交的数据
            if(postData!=null&&!"".equals(postData)){
            	httpUrl.setDoOutput(true);
            	httpUrl.getOutputStream().write(postData.getBytes());
                httpUrl.getOutputStream().flush();
            }else{
            	httpUrl.connect();
            }
            
        	// 获取所有响应头字段
			java.util.Map<String, java.util.List<String>> map = httpUrl.getHeaderFields();

			// 遍历所有的响应头字段
			for (String key : map.keySet()) {
				System.out.println(key + "--->" + map.get(key));
			}

            int code = httpUrl.getResponseCode();   
            if(code==200){
				reader = new BufferedReader(new InputStreamReader(httpUrl.getInputStream()));
				String line;
				while ((line = reader.readLine()) != null) {
					System.out.println(line);
					result+=line;
				}
            }
			
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			try {
				if (reader != null) {
					reader.close();
				}
			
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
	}
	
		
	/**
	 * 
	 *  @Description    : 向指定URL发送GET方法的请求
	 *  @Method_Name    : sendGet
	 *  @param url	发送请求的URL
	 *  @param getData 请求参数，请求参数应该是name1=value1&name2=value2的形式。
	 *  @param headparam 通用的请求属性 注意 Cookie 写setRequestProperty("Cookie", cookieValue);
	 *  @return 
	 *  @return         : String
	 *  @Creation Date  : 2012-4-7 下午02:40:49 
	 *  @version        : v1.00
	 *  @Author         : skyblue
	 *  @Update Date    : 
	 *  @Update Author  : skyblue
	 */
    @SuppressWarnings("unchecked")
	public static String sendGet(String url, String getData,Map headparam) {
		String result = "";
		BufferedReader in = null;
		URLConnection conn =null;
		try {
			// 拼接 GET参数
			if(getData!=null&&!"".equals(getData)){
				url = url + "?" + getData;
			}
			URL realUrl = new URL(url);

			// 打开和URL之间的连接
			conn = realUrl.openConnection();

			// 设置通用的请求属性
			if (headparam != null) {
				Iterator it = headparam.entrySet().iterator();
				while (it.hasNext()) {
					Map.Entry entry = (Map.Entry) it.next();
					conn.setRequestProperty((String) entry.getKey(),(String) headparam.get(entry.getKey()));
				}
			}
		
			// 建立实际的连接
			conn.connect();

			// 获取所有响应头字段
			java.util.Map<String, java.util.List<String>> map = conn.getHeaderFields();

			// 遍历所有的响应头字段
			for (String key : map.keySet()) {
				System.out.println(key + "--->" + map.get(key));
			}
			
			// 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.out.println("发送GET请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输入流
		finally {
			try {
				if (in != null) {
					in.close();
				}
				conn=null;
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
	}

    // 提供主方法，测试发送GET请求
    @SuppressWarnings("unchecked")
	public static void main(String args[]) {
        // 发送GET请求
    	Map map=new HashMap();
    	map.put("Content-Type", "application/x-www-form-urlencoded");
        String s1 = RequestHelper.sendPost("http://www.ip138.com/ips.asp","ip=119.119.100.121",map);
        System.out.println(s1);
    }
}