HTTPClient基础
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2022-07-11 17:39:18
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使用HttpClient的一般步骤:
1:创建HTTPClient实例
2:创建某种连接方法的实例,并且传入URL
3:使用HTTPClint实例调用executeMethod,参数为某连接方法的实例
4:接收该方法的返回的状态,并对该状态进行判断
5:接收Response的返回值
6:释放连接
示例:
GET
1:创建实例
HTTPClient client = new HTTPClient()
2:创建GET连接方法实例
GetMethod get = new GetMethod(URL);
3:调用方法,获取状态
int status = client.executeMethod(get);
4:根据状态不同调用不同的处理方式,以下为状态为200,即正常的情况下
String result = get.getResponseBodyAsString();
5:释放连接
get.releaseConnection()
完整示例如下:
public class Test(){ public static void main(String[] args){ String url = ""; String result = null; HttpClient client = new HttpClient(); GetMethod method = new GetMethod(url); try{ int status = client.executeMethod(method); if(status==200){ result = method.getResponseBodyAsString(); } } catch(HttpException e){ e.printStackTrace(); } catch(IOException e){ e.printStackTrace(); } catch(Exception e){ e.printStackTrace(); } finally{ method.releaseConnection(); } } }
POST
1:创建实例
HTTPClient client = new HTTPClient()
2:创建GET连接方法实例
PostMethod post = new PostMethod(URL);
3:获取POST参数
post.setRequestBody(data);
4:调用方法,获取状态
int status = client.executeMethod(post);
5:根据状态不同调用不同的处理方式,以下为状态为200,即正常的情况下
String result = get.getResponseBodyAsString();
6:释放连接
get.releaseConnection()
完整示例如下:
public class Test(){ public static void main(String[] args){ //获取请求的参数 String data = "test"; String url = "http://www.test.com"; String result = null; HttpClient client = new HttpClient(); PostMethod method = new PostMethod(url); method.setRequestBody(data); try{ int status = client.executeMethod(method); if(status==200){ result = method.getResponseBodyAsString(); } } catch(HttpException e){ e.printStackTrace(); } catch(IOException e){ e.printStackTrace(); } catch(Exception e){ e.printStackTrace(); } finally{ method.releaseConnection(); } } }