http服务向服务器发送并接受数据--------------HttpClient对象向服务器发送并接受数据

一、定义http服务向服务器发送并接受数据

（1）（连接工具类）

public class HttpURLConn {

// 发送带参数的Post请求,得到返回的xml字符串

public static String sendPost(String url, String param) throws Exception {
String result = "";
System.out.println("connent_center!");
System.out.println("url="+url);
try {
URL httpurl = new URL(url);
HttpURLConnection httpConn = (HttpURLConnection) httpurl
.openConnection();
httpConn.setDoOutput(true);
httpConn.setDoInput(true);
// httpConn.setRequestMethod("POST");
PrintWriter out = new PrintWriter(httpConn.getOutputStream());
out.print(URLEncoder.encode(param,"GBK"));
out.print(param);
out.flush();
out.close();
BufferedReader in = new BufferedReader(new InputStreamReader(
httpConn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
in.close();
} catch (Exception e) {
// System.out.println("没有结果！" + e);
log.error("sendPost fail", e);
throw e;
}
log.debug(result);
return result;
}

}

（2）调用上边方法的测试类

public class Test{

public static void main(String[] args) {

String temp="测试数据！";

URL url = new URL("http://trade.caimincun.com/servlet/NotifyDataServlet.do?");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();

HttpURLConn.sendPost(url ,temp);

}

}

二、HttpClient对象向服务器发送并接受数据

测试类Test：

package *;

import java.io.IOException;

import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;

public class Test{

public static void main(String[] args) {

//定义客户端向url发送的参数1

String transType ="参数1";
//定义客户端向url发送的参数2
String transMessage ="参数2";
//定义需要访问的url链接

String url = "http://trade.caimincun.com/servlet/HttpServlet.do";

//定义http客户端对象--httpClient
HttpClient httpClient = new HttpClient();
//定义并实例化客户端链接对象-postMethod
PostMethod postMethod = new PostMethod(url);
// 设置http的头
postMethod.setRequestHeader("ContentType","application/x-www-form-urlencoded;charset=GBK");

// 填入各个表单域的值

NameValuePair[] data = { new NameValuePair("transType", transType),
new NameValuePair("transMessage", transMessage) };
// 将表单的值放入postMethod中

postMethod.setRequestBody(data);

// 定义访问地址的链接状态---eg:400,500
int statusCode = 0;
try {
//客户端请求url数据
statusCode = httpClient.executeMethod(postMethod);
} catch (Exception e) {

e.printStackTrace();
}
// HttpClient对于要求接受后继服务的请求，象POST和PUT等不能自动处理转发

// 301或者302
if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
|| statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {

// 从头中取出转向的地址
Header locationHeader = postMethod.getResponseHeader("location");
String location = null;
if (locationHeader != null) {
location = locationHeader.getValue();
System.out.println("The page was redirected to:" + location);
} else {
System.err.println("Location field value is null.");
}
} else {
try {
result_str = postMethod.getResponseBodyAsString();
} catch (IOException e) {
e.printStackTrace();
}
}
System.out.println(new Date(System.currentTimeMillis())+" "+"代理商返回信息："+result_str);

//释放链接
postMethod.releaseConnection();
httpClient.getHttpConnectionManager().closeIdleConnections(0);

}

}