下面提供二种方法会使用java发送url请求，并获取服务器返回的值

第一种方法：

代码如下:

import org.apache.http.HttpEntity

import org.apache.http.HttpResponse

import org.apache.http.NameValuePair

import org.apache.http.client.HttpClient

import org.apache.http.client.entity.UrlEncodedFormEntity

import org.apache.http.client.methods.HttpPost

import org.apache.http.impl.client.DefaultHttpClient

import org.apache.http.message.BasicNameValuePair

import org.apache.http.params.CoreConnectionPNames

import org.apache.http.util.EntityUtils

publicstaticStringsendUrlRequest(StringurlStr,Stringparam1,Stringparam2)throwsException{

StringtempStr=null

HttpClienthttpclient=newDefaultHttpClient()

Propertiesproperties=newProperties()

HttpEntityentity=null

StringxmlContent=""

try

{

//设置超时时间

httpclient.getParams().setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT,20000)

httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,20000)

//封装需要传递的参数

List<NameValuePair>nvps=newArrayList<NameValuePair>()

nvps.add(newBasicNameValuePair("mainMemoCode",strmainMemoCode))

nvps.add(newBasicNameValuePair("recordPassWord",strrecordPassWord))

//客户端的请求方法类型

HttpPosthttpPost=newHttpPost(urlStr)

httpPost.setEntity(newUrlEncodedFormEntity(nvps,"GBK"))

HttpResponseresponse=httpclient.execute(httpPost)

//获取服务器返回Http的Content-Type的值

tempStr=response.getHeaders("Content-Type")[0].getValue().toString()

//获取服务器返回页面的值

entity=response.getEntity()

xmlContent=EntityUtils.toString(entity)

Stringstrmessage=null

System.out.println(xmlContent)

System.out.println(response.getHeaders("Content-Type")[0].getValue().toString())

httpPost.abort()

}

catch(SocketTimeoutExceptione)

{

}

catch(Exceptionex)

{

ex.printStackTrace()

}

finally{

httpclient.getConnectionManager().shutdown()

}

第二种方法：

代码如下:

publicstaticStringsendUrlRequest(StringurlStr,Stringparam1,Stringparam2)throwsException{

HttpURLConnectionurl_con=null

try{

URLurl=newURL(urlStr)

StringBufferbankXmlBuffer=newStringBuffer()

//创建URL连接，提交到数据，获取返回结果

HttpURLConnectionconnection=(HttpURLConnection)url.openConnection()

connection.setRequestMethod("POST")

connection.setDoOutput(true)

connection.setRequestProperty("User-Agent","directclient")

PrintWriterout=newPrintWriter(newOutputStreamWriter(connection.getOutputStream(),"GBK"))

out.println(param)

out.close()

BufferedReaderin=newBufferedReader(newInputStreamReader(connection

.getInputStream(),"GBK"))

StringinputLine

while((inputLine=in.readLine())!=null){

bankXmlBuffer.append(inputLine)

}

in.close()

tempStr=bankXmlBuffer.toString()

}

catch(Exceptione)

{

System.out.println("发送GET请求出现异常！"+e)

e.printStackTrace()

}finally{

if(url_con!=null)

url_con.disconnect()

}

returntmpeStr

}

总结：多练习代码，熟练之后才能更快速的去了解代码的学习的方法。多去获取一些思维方面的书籍可以看看。

可以用以下代码参考一下，如何获取URL返回状态码：

String surl = ""

try {

           surl="你的url"

               URL url = new URL(surl)

               URLConnection rulConnection   = url.openConnection()

               HttpURLConnection httpUrlConnection  =  (HttpURLConnection) rulConnection

               httpUrlConnection.setConnectTimeout(300000)

               httpUrlConnection.setReadTimeout(300000)

               httpUrlConnection.connect()

               String code = new Integer(httpUrlConnection.getResponseCode()).toString()

               String message = httpUrlConnection.getResponseMessage()

               System.out.println("getResponseCode code ="+ code)

               System.out.println("getResponseMessage message ="+ message)

               if(!code.startsWith("2")){

                    throw new Exception("ResponseCode is not begin with 2,code="+code)

               }

               System.out.println(getCurDateTime()+"连接"+surl+"正常")

          }catch(Exception ex){

               System.out.println(ex.getMessage())

          }

//URL url=new URL("http://www.youdao.com/smartresult-xml/search.s?type=ip&q=58.214.5.162")

URL url=new URL("http://whois.pconline.com.cn/ip.jsp?ip="+ip)

HttpURLConnection connect=(HttpURLConnection)url.openConnection()

InputStream is = connect.getInputStream()

ByteArrayOutputStream outStream = new ByteArrayOutputStream()

byte[] buff = new byte[256]

int rc = 0

while ( (rc = is.read(buff, 0, 256)) >0) {

outStream.write(buff, 0, rc)

}

byte[] b = outStream.toByteArray()

//关闭

outStream.close()

is.close()

connect.disconnect()

String address =new String(b)

if(address.indexOf("省")!=-1)

{

ipprovince =address.substring(0,address.indexOf("省")+1)

System.out.println("省地址为："+ipprovince)

}else if(address.indexOf("区")!=-1)

{

ipprovince =address.substring(0,address.indexOf("区")+1)

System.out.println("省地址为："+ipprovince)

}else

{

ipprovince =

address.substring(0,address.indexOf("市")+1)

System.out.println("省地址为："+ipprovince)

}

}catch(Exception e){

e.printStackTrace()

}