发送 GET 跟 POST请求

发送 GET 和 POST请求

/**
	 *@param url 发送请求的url
	 *@param param 请求参数 请求参数应该是 name=xx&pass=xxxx 
	 */
	public static String sendGet(String url,String param){
		String result="";
		BufferedReader bfr=null;
		try {
			String urlName=url+"?"+param;
			URL realUrl=new URL(urlName);
			URLConnection conn=realUrl.openConnection();
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-age", "Mozilla/4.0 (compatible;MSIE 6.0;Window NT 5.1;SV1)");
			
			//建立实际的连接
			conn.connect();
			Map<String,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 BufferedRead输入流来读取URL的响应
			bfr=new BufferedReader(new InputStreamReader(conn.getInputStream()));
			
			String line;
			while((line=bfr.readLine())!=null){
				result+="\n"+line;
			}
		} catch (Exception e) {
			System.out.print("发送GET请求出现异常:"+e);
			e.printStackTrace();
		}finally{
			try {
				if(bfr!=null)
					bfr.close();
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
		
	}
	
	/**
	 *@param url 发送请求的url
	 *@param param 请求参数 请求参数应该是 name=xx&pass=xxxx 
	 */
	public static String sendPost(String url,String param){
		PrintWriter out=null;
		BufferedReader in=null;
		String result="";
		try {
			URL realUrl=new URL(url);
			URLConnection conn=realUrl.openConnection();
			//设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-age", "Mozilla/4.0 (compatible;MSIE 6.0;Window NT 5.1;SV1)");
			
			//发送POST请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			out=new PrintWriter(conn.getOutputStream());
			out.print(param);
			out.flush();
			in=new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String line;
			while((line=in.readLine())!=null){
				result+="\n"+line;
			}
		} catch (Exception e) {
			System.out.println("发送POST请求出现异常:"+e);
			e.printStackTrace();
		}finally{
			try {
				if(out!=null)
					out.close();
				if(in!=null)
					in.close();
				
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
	}