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Java利用HttpClient模擬POST表單操作應(yīng)用及注意事項(xiàng)

 更新時(shí)間：2016年04月19日 11:40:10   作者：88250  
本文主要介紹JAVA中利用HttpClient模擬POST表單操作，希望對(duì)大家有所幫助。

HttpClient使用post方法提交數(shù)據(jù) 源代碼：

復(fù)制代碼 代碼如下:

package post;
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 PostHttp {
 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  HttpClient httpClient = new HttpClient();
  String url = "   PostMethod postMethod = new PostMethod(url);
//   填入各個(gè)表單域的值
  NameValuePair[] data = {
    new NameValuePair("ID", "11"),
    new NameValuePair("mtg", "0"),
    new NameValuePair("haveCookie", "0"),
    new NameValuePair("backID", "30"),
    new NameValuePair("psw", "password")
  };
//   將表單的值放入postMethod中
  postMethod.setRequestBody(data);
//   執(zhí)行postMethod
  int statusCode = 0;
  try {
   statusCode = httpClient.executeMethod(postMethod);
  } catch (HttpException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
//   HttpClient對(duì)于要求接受后繼服務(wù)的請(qǐng)求，象POST和PUT等不能自動(dòng)處理轉(zhuǎn)發(fā)
//   301或者302
  if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY)
  {
   //   從頭中取出轉(zhuǎn)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.");
   }
   return;
  }
  else
  {
         System.out.println(postMethod.getStatusLine());
         String str = "";
         try {
               str = postMethod.getResponseBodyAsString();
         } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
         }       
         System.out.println(str);
  }
  postMethod.releaseConnection();
        return ;
 }
}

//這是一個(gè)用戶認(rèn)證過程的登陸信息

其中需要的jar包：

1、commons-httpclient-3.1-rc1.zip http://jakarta.apache.org/commons/httpclient/downloads.html

2、commons-codec-1.3.jar    http://jakarta.apache.org/site/downloads/downloads_commons-codec.cgi

3、commons-logging-api.jar   在tomcat5.5中的Tomcat 5.5/bin目錄下或者    http://jakarta.apache.org/site/downloads/downloads_commons-logging.cgi

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