Java 发Post请求程序

//说明使用java的HttpConnection 模拟发送post请求。

//该程序用来抓成绩公布网站上的指定范围准考证号的成绩情况。

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Vector;

public class GetMain {

/**
* @param args
*/
private static String URL = "http://202.121.151.2:8080/petss2008/petss2008.jsp";
private static String url2="http://202.121.151.2:8080/petss2008/petss2008.htm";

public static void main(String[] args) {

//Post Data 为Form提交的内容。
String postData="zkzh=01040810"+l+i+j+k+"&tijiao.x=26&tijiao.y=8";
String html=GetResponseDataByID(URL,postData);
String[] data=getNeedData(html);

}
}

public static void PrintStrs(String[] str)
{
for(String s:str)
{
System.out.print(s+",");
}
System.out.println();
}

//通过url和postdata获取返回值。该函数为主要函数可以copy使用返回值为一个Html页面的数据。
public static String GetResponseDataByID(String url,String postData)
{
String data=null;
try {
URL dataUrl = new URL(url);
HttpURLConnection con = (HttpURLConnection) dataUrl.openConnection();
con.setRequestMethod("POST");
con.setRequestProperty("Proxy-Connection", "Keep-Alive");
con.setDoOutput(true);
con.setDoInput(true);

OutputStream os=con.getOutputStream();
DataOutputStream dos=new DataOutputStream(os);
dos.write(postData.getBytes());
dos.flush();
dos.close();

InputStream is=con.getInputStream();
DataInputStream dis=new DataInputStream(is);
byte d[]=new byte[dis.available()];
dis.read(d);
data=new String(d);
//System.out.println(data);
con.disconnect();
} catch (Exception ex) {
ex.printStackTrace();
}
return data;
}

/**Get Needed Data Form Responsed Html File**/
static String I1="准考证号";
static String I2="姓 名";
static String I3="级别";
static String I4="笔试成绩";
static String I5="口试成绩";

public static String[] getNeedData(String html)
{
if(html==null)
return null;
String[] str=new String[5];
str[0]=getPart(html,I1);
str[1]=getPart(html,I2);
str[2]=getPart(html,I3);
str[3]=getPart(html,I4);
str[4]=getPart(html,I5);

return str;
}

public static String getPart(String source,String type)
{
if(source==null)
return null;
if(source.indexOf("准考证号输入错误")!=-1)
return null;
if(source.indexOf(type)!=-1)
{
source=source.substring(source.indexOf(type)+type.length());
source=source.substring(0,source.indexOf("</TD></TR>"));
source=source.replace("</TD>", "");
source=source.replace("<TD>", "");
source=source.replace("<TD align=center >", "");
source=source.replace("<TD align=center>", "");
source=source.replace("/n","");
return source.trim();
}
else
return null;
}
}