关于java实现http请求工具类示例

通过http rest请求返回数据

复制代码 代码如下:

import ;

import actory;

import ValuePair;

import ntProtocolException;

import Client;

import onseHandler;

import ncodedFormEntity;

import Get;

import Post;

import cResponseHandler;

import ultHttpClient;

import adSafeClientConnManager;

import ception;

import ageFormat;

import ;

import Unit;

/**

* 分装一个http请求的.工具类

*

* @author 顾炜【guwei】 on 14-4-22.下午3:17

*/

public class HttpClientUtils {

private static final Log log = og(s);

/**

* 初始化HttpClient

*/

private static HttpClient httpClient = null;

/**

* 生产HttpClient实例

* 公开，静态的工厂方法，需要使用时才去创建该单体

*

* @return

*/

public static HttpClient getHttpClient() {

if (httpClient == null) {

httpClient = new DefaultHttpClient(new ThreadSafeClientConnManager());

}

return httpClient;

}

/**

* POST方式调用

*

* @param url

* @param params 参数为NameValuePair键值对对象

* @return 响应字符串

* @throws pportedEncodingException

*/

public static String executeByPOST(String url, Listparams) {

HttpClient httpclient = getHttpClient();

HttpPost post = new HttpPost(url);

ResponseHandlerresponseHandler = new BasicResponseHandler();

String responseJson = null;

try {

if (params != null) {

ntity(new UrlEncodedFormEntity(params));

}

responseJson = ute(post, responseHandler);

("HttpClient POST请求结果：" + responseJson);

} catch (ClientProtocolException e) {

tStackTrace();

("HttpClient POST请求异常：" + essage());

} catch (IOException e) {

tStackTrace();

} finally {

onnectionManager()eExpiredConnections();

onnectionManager()eIdleConnections(30, NDS);

}

return responseJson;

}

/**

* Get方式请求

*

* @param url 带参数占位符的URL，例：http://****/User/user/{0}&email={1}

* @param params 参数值数组，需要与url中占位符顺序对应

* @return 响应字符串

* @throws pportedEncodingException

*/

public static String executeByGET(String url, Object[] params) {

HttpClient httpclient = getHttpClient();

String messages = at(url, params);

HttpGet get = new HttpGet(messages);

ResponseHandlerresponseHandler = new BasicResponseHandler();

String responseJson = null;

try {

responseJson = ute(get, responseHandler);

("HttpClient GET请求结果：" + responseJson);

} catch (ClientProtocolException e) {

tStackTrace();

("HttpClient GET请求异常：" + essage());

} catch (IOException e) {

tStackTrace();

("HttpClient GET请求异常：" + essage());

} finally {

onnectionManager()eExpiredConnections();

onnectionManager()eIdleConnections(30, NDS);

}

return responseJson;

}

/**

* @param url

* @return

*/

public static String executeByGET(String url) {

HttpClient httpclient = getHttpClient();

HttpGet get = new HttpGet(url);

ResponseHandlerresponseHandler = new BasicResponseHandler();

String responseJson = null;

try {

responseJson = ute(get, responseHandler);

("HttpClient GET请求结果：" + responseJson);

} catch (ClientProtocolException e) {

tStackTrace();

("HttpClient GET请求异常：" + essage());

} catch (IOException e) {

tStackTrace();

("HttpClient GET请求异常：" + essage());

} finally {

onnectionManager()eExpiredConnections();

onnectionManager()eIdleConnections(30, NDS);

}

return responseJson;

}

}