HTTPClient基础

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();
}
}
}

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