HttpClient

	/**
	 * 通过get请求往服务器提交数据
	 * @param path  请求路径
	 * @param username  用户名
	 * @param password  密码
	 * @return
	 * @throws Exception
	 */
	public boolean loginByGet(String path,String username,String password) throws Exception{
		///http://192.168.1.101:8080/web/LoginServlet?name=%E7%BE%8E%E5%A5%B3&password=123456
		StringBuilder sb = new StringBuilder(path);
		sb.append("?");
		sb.append("name=").append(URLEncoder.encode(username, "utf-8"));
		sb.append("&");
		sb.append("password=").append(password);
		
		URL url = new URL(sb.toString());
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		conn.setConnectTimeout(5000);
		conn.setRequestMethod("GET");
		if(conn.getResponseCode() == 200){
			return true;
		}
		return false;
	}
	
	/**通过post请求向服务器提交数据
	 * post   请求首先是先把数据写入到缓存。一定要向服务器去获取数据
	 * @param path
	 * @param username
	 * @param password
	 * @return
	 * @throws Exception
	 */
	public boolean loginByPost(String path,String username,String password) throws Exception{
		
		URL url = new URL(path);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		
		conn.setConnectTimeout(5000);
		conn.setRequestMethod("POST");
		
		//name=%E5%8F%B0%E6%B9%BE%E5%AF%8C%E5%B0%91&password=123456
		StringBuilder sb = new StringBuilder();
		sb.append("name=").append(URLEncoder.encode(username, "utf-8")).append("&");
		sb.append("password=").append(password);
		byte[] entity = sb.toString().getBytes();
		
		//设置请求参数
		conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");//实体参数的类型
		conn.setRequestProperty("Content-Length", entity.length+"");//实体参数的长度
		//允许对外输出
		conn.setDoOutput(true);
		OutputStream os = conn.getOutputStream();
		os.write(entity);
		
		if(conn.getResponseCode() == 200){
			return true;
		}
		return false;
	}
	
	/**
	 * 通过HttpClient  以get请求向服务器提交数据
	 * @param path
	 * @param username
	 * @param password
	 * @return
	 * @throws Exception
	 */
	public boolean loginByHttpClientGet(String path,String username,String password) throws Exception{
		
		StringBuilder sb = new StringBuilder(path);
		sb.append("?");
		sb.append("name=").append(URLEncoder.encode(username, "utf-8"));
		sb.append("&");
		sb.append("password=").append(password);
		
		//1 得到浏览器
		HttpClient httpClient = new DefaultHttpClient();//浏览器
		
		//2 指定请求方式
		HttpGet httpGet = new HttpGet(sb.toString());
		
		//3执行请求
		HttpResponse httpResponse = httpClient.execute(httpGet);
		
		//4判断请求是否成功
		int statusCode = httpResponse.getStatusLine().getStatusCode();
		if(statusCode == 200){
			return true;
		}
		return false;
	}
	
	/**
	 * 通过httpClient  以post请求向服务器发送数据
	 * @param path
	 * @param username
	 * @param password
	 * @return
	 * @throws Exception
	 */
	public boolean loginHttpClientByPost(String path,String username,String password) throws Exception{
		
		//1 得到浏览器
		HttpClient httpClient = new DefaultHttpClient();
		
		//2 指定请求方式
		HttpPost httpPost = new HttpPost(path);
		
		//3构建请求实体的数据
		List<NameValuePair> parameters = new ArrayList<NameValuePair>();
		parameters.add(new BasicNameValuePair("name", username));
		parameters.add(new BasicNameValuePair("password", password));
		
		//4 构建实体
		UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters, "utf-8");
		
		//5 把实体数据设置到请求对象
		httpPost.setEntity(entity);
		
		//6 执行请求
		HttpResponse httpResponse = httpClient.execute(httpPost);
		
		//7 判断请求是否成功
		if(httpResponse.getStatusLine().getStatusCode() == 200){
			return true;
		}
		
		return false;
	}
	

    /**
     * 通过httpClient 3.1 来实现文件的上传	
     * @param path  路径
     * @param username  用户名
     * @param password  密码
     * @param filename  文件路径名
     * @return
     * @throws Exception
     */
	public boolean uploadFile(String path,String username,String password,String filename) throws Exception{
		
		//1 得到浏览器
		org.apache.commons.httpclient.HttpClient httpClient = new org.apache.commons.httpclient.HttpClient();
		
		//2确定请求方式
		PostMethod postMethod = new PostMethod(path);
		
		//3 确定请求的参数
		Part[] parts = new Part[]{new StringPart("name", username),
				new StringPart("password", password),
				new FilePart("file", new File(filename))};
		
		//4 构建实体
		MultipartRequestEntity entity = new MultipartRequestEntity(parts, postMethod.getParams());
		
		//5 设置实体
		postMethod.setRequestEntity(entity);
		
		//6 执行请求
		int responseCode = httpClient.executeMethod(postMethod);
		
		// 7判断请求是否成功
		if(responseCode == 200){
			return true;
		}
		
		return false;
	}