一、HttpClient介绍
HttpClient是用来模拟HTTP请求的，其实实质就是把HTTP请求模拟后发给Web服务器
HTTP GET核心代码：
(1)DefaultHttpClient client = new DefaultHttpClient();
(2)HttpGet get = new HttpGet(String url);//此处的URL为http://..../path?arg1=value&....argn=value
(3)HttpResponse response = client.execute(get); //模拟请求
(4)int code = response.getStatusLine().getStatusCode();//返回响应码
(5)InputStream in = response.getEntity().getContent();//服务器返回的数据
HTTP POST核心代码：
(1)DefaultHttpClient client = new DefaultHttpClient();
(2)BasicNameValuePair pair = new BasicNameValuePair(String name,String value);//创建一个请求头的字段，比如content-type,text/plain
(3)UrlEncodedFormEntity entity = new UrlEncodedFormEntity(List<NameValuePair> list,String encoding);//对自定义请求头进行URL编码
(4)HttpPost post = new HttpPost(String url);//此处的URL为http://..../path
(5)post.setEntity(entity);
(6)HttpResponse response = client.execute(post);
(7)int code = response.getStatusLine().getStatusCode();
(8)InputStream in = response.getEntity().getContent();//服务器返回的数据
//测试代码：
public static void main(String[] args) throws Exception
{
DefaultHttpClient client = new DefaultHttpClient();
List<NameValuePair> list = new ArrayList<NameValuePair>();
String data = "aaa";
NameValuePair pair1 = new BasicNameValuePair("data", data);
list.add(pair1);
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, "UTF-8");
HttpPost post = new HttpPost("http://192.168.0.10:80/Server/Servlet/");
post.setEntity(entity);
HttpResponse response = client.execute(post);
if(response.getStatusLine().getStatusCode() == 200)
{
InputStream in = response.getEntity().getContent();// 接收服务器的数据
String str = readString(in);
System.out.println("str:" + str);
}
else
{
System.out.println("调用失败");
}
}
private static String readString(InputStream in) throws Exception
{
byte[] data = new byte[1024];
int length = 0;
ByteArrayOutputStream bout = new ByteArrayOutputStream();
while((length = in.read(data)) != -1)
{
bout.write(data, 0, length);
}
return new String(bout.toByteArray(), "UTF-8");
}